├── .gitignore
├── LICENSE
├── ListDirectoryContentInGitFormat.md
├── README.md
├── Step01.md
├── Step02.md
├── Step03.md
├── Step04.md
├── Step05.md
├── Step06.md
├── Step07.md
├── Step08.md
├── Step09.md
├── Step10.md
├── Step11.md
├── Step13.md
├── Step14.md
├── Step15.md
├── Step17.md
├── Step20.md
├── Step24.md
├── Step25.md
├── Step27.md
├── pom.xml
└── src
    └── main
        ├── java
            └── com
            │   └── in28minutes
            │       ├── filter
            │           └── LoginRequiredFilter.java
            │       ├── login
            │           ├── LoginService.java
            │           └── LoginServlet.java
            │       ├── logout
            │           └── LogoutServlet.java
            │       └── todo
            │           ├── AddTodoServlet.java
            │           ├── DeleteTodoServlet.java
            │           ├── ListTodoServlet.java
            │           ├── Todo.java
            │           └── TodoService.java
        └── webapp
            └── WEB-INF
                ├── common
                    ├── footer.jspf
                    ├── header.jspf
                    └── navigation.jspf
                ├── views
                    ├── add-todo.jsp
                    ├── list-todos.jsp
                    └── login.jsp
                └── web.xml


/.gitignore:
--------------------------------------------------------------------------------
 1 | # Compiled class file
 2 | *.class
 3 | 
 4 | # Log file
 5 | *.log
 6 | 
 7 | # BlueJ files
 8 | *.ctxt
 9 | 
10 | # Mobile Tools for Java (J2ME)
11 | .mtj.tmp/
12 | 
13 | # Package Files #
14 | *.jar
15 | *.war
16 | *.ear
17 | *.zip
18 | *.tar.gz
19 | *.rar
20 | *.cmd
21 | *.classpath
22 | *.settings
23 | *.project
24 | *.mvn
25 | mvnw
26 | target
27 | *.DS_Store
28 | 
29 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
30 | hs_err_pid*
31 | 


--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/ListDirectoryContentInGitFormat.md:
--------------------------------------------------------------------------------
 1 | ListDirectoryContentInGitFormat
 2 | ```
 3 | package test;
 4 | import java.io.BufferedReader;
 5 | import java.io.File;
 6 | import java.io.FileNotFoundException;
 7 | import java.io.FileReader;
 8 | import java.io.IOException;
 9 | 
10 | public class ListDirectoryContentInGitFormat {
11 | 
12 | 	public static final String DIRECTORY_WINDOWS = "C:\\Users\\rrkaranam\\workspace\\webapp\\";
13 | 
14 | 	public static void main(String[] args) throws FileNotFoundException, IOException {
15 | 		ListDirectoryContentInGitFormat listFilesUtil = new ListDirectoryContentInGitFormat();
16 | 
17 | 		listFilesUtil.listFilesAndFilesSubDirectories(DIRECTORY_WINDOWS);
18 | 
19 | 	}
20 | 
21 | 	/**
22 | 	 * List all files from a directory and its subdirectories
23 | 	 * 
24 | 	 * @param rootDirectory
25 | 	 *            to be listed
26 | 	 * @throws IOException
27 | 	 * @throws FileNotFoundException
28 | 	 */
29 | 	public void listFilesAndFilesSubDirectories(String rootDirectory) throws FileNotFoundException, IOException {
30 | 		File directory = new File(rootDirectory);
31 | 		// get all the files from a directory
32 | 		File[] fList = directory.listFiles();
33 | 		for (File file : fList) {
34 | 			if (file.getName().startsWith(".") || file.getName().startsWith("target"))
35 | 				continue;
36 | 
37 | 			if (file.isFile()) {
38 | 				printContent(file.getAbsolutePath());
39 | 			} else if (file.isDirectory()) {
40 | 				listFilesAndFilesSubDirectories(file.getAbsolutePath());
41 | 			}
42 | 		}
43 | 	}
44 | 
45 | 	private void printContent(String absolutePath) throws FileNotFoundException, IOException {
46 | 		System.out.println(absolutePath.replace(DIRECTORY_WINDOWS, ""));
47 | 		System.out.println("```");
48 | 		try (BufferedReader br = new BufferedReader(new FileReader(absolutePath))) {
49 | 			String line = null;
50 | 			while ((line = br.readLine()) != null) {
51 | 				System.out.println(line);
52 | 			}
53 | 		}
54 | 		System.out.println("```");
55 | 	}
56 | 
57 | }
58 | ```
59 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Java Web Application in 25 Easy Steps
 2 | 
 3 | [![Image](https://www.springboottutorial.com/images/Course-Java-Servlets-and-JSP-BuildJavaEEAppIn25Steps.png "Java Servlets and JSP - Build Java EE(JEE) app in 25 Steps")](https://www.udemy.com/course/learn-java-servlets-and-jsp-web-application-in-25-steps/)
 4 | 
 5 | ## Learn Java Web Application Development with JSPs and Servlets Easy!
 6 | 
 7 | ### Installing Eclipse and Java
 8 | 
 9 | https://github.com/in28minutes/SpringIn28Minutes/blob/master/InstallationGuide-JavaEclipseAndMaven_v2.pdf
10 | 
11 | ### Running Examples
12 | - If you are downloading the zip file, unzip the file
13 | - Open Command Prompt and Change directory to folder containing pom.xml
14 | - Run command "mvn tomcat7:run"
15 | - For help : user our installation guide - https://github.com/in28minutes/SpringIn28Minutes/blob/master/InstallationGuide-JavaEclipseAndMaven_v2.pdf
16 | 
17 | ### File wise Contents
18 | - Step01.md :   Up and running with a web app in Tomcat
19 | - Step02.md :	First JSP
20 | - Step03.md :	Adding a GET Parameter name
21 | - Step04.md :	Adding another Get Parameter Password
22 | - Step05.md :   Lets add a form
23 | - Step06.md :	New Form and doPost
24 | - Step07.md :	Adding Password, validation of userid/password
25 | - Step08.md :	Adding a TodoService and Todos to welcome.jsp
26 | - Step09.md :	Bit of Refactoring - Packages	9 days ago
27 | - Step10.md : Redirect from One Servlet to another - New TodoServlet.
28 | - Step11.md	: First JSTL Tag : Using a Loop around todos	
29 | - Step12    : Difference between Session and Request Scopes
30 | - Step13.md	: Add a New Todo
31 | - Step14.md	: Delete Todo with equals and hashcode methods
32 | - Step15.md	: Adding webjars for jquery and bootstrap
33 | - Step16    : Missing Step :) We want you to take a break. Nothing in here..
34 | - Step17.md	: updating Bootstrap to 3.3.6
35 | - Step 18 (Code file missing) : Refactoring: list-todos.do,list-todos.jsp,ListTodosServlet. Refer Next Step for code.
36 | - Step 19 (Code file missing) : Adding a Filter for More Security. Refer Next Step for code.
37 | - Step20.md	: Logout
38 | - Step 21 : Theory : Understand Maven and Tomcat
39 | - Step 22 : Theory : Servlet LifeCycle
40 | - Step 23 : Theory : Model 1 and Model 2 MVC Architectures
41 | - Step24.md   : Moving Add Functionality to a New Page.
42 | - Step25.md   : Add Category Field
43 | - Step26(Code file missing)    : Format the jsps better. Refer Next Step for code.
44 | - Step27.md   : Jsp Fragments
45 | 
46 | ### Troubleshooting
47 | - Refer our TroubleShooting Guide - https://github.com/in28minutes/in28minutes-initiatives/tree/master/The-in28Minutes-TroubleshootingGuide-And-FAQ
48 | 
49 | ## Youtube Playlists - 500+ Videos
50 | 
51 | [Click here - 30+ Playlists with 500+ Videos on Spring, Spring Boot, REST, Microservices and the Cloud](https://www.youtube.com/user/rithustutorials/playlists?view=1&sort=lad&flow=list)
52 | 
53 | ## Keep Learning in28Minutes
54 | 
55 | in28Minutes is creating amazing solutions for you to learn Spring Boot, Full Stack and the Cloud - Docker, Kubernetes, AWS, React, Angular etc. - [Check out all our courses here](https://github.com/in28minutes/learn)
56 | 


--------------------------------------------------------------------------------
/Step01.md:
--------------------------------------------------------------------------------
  1 | \pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 | 	</dependencies>
 19 | 
 20 | 	<build>
 21 | 		<pluginManagement>
 22 | 			<plugins>
 23 | 				<plugin>
 24 | 					<groupId>org.apache.maven.plugins</groupId>
 25 | 					<artifactId>maven-compiler-plugin</artifactId>
 26 | 					<version>3.2</version>
 27 | 					<configuration>
 28 | 						<verbose>true</verbose>
 29 | 						<source>1.7</source>
 30 | 						<target>1.7</target>
 31 | 						<showWarnings>true</showWarnings>
 32 | 					</configuration>
 33 | 				</plugin>
 34 | 				<plugin>
 35 | 					<groupId>org.apache.tomcat.maven</groupId>
 36 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 37 | 					<version>2.2</version>
 38 | 					<configuration>
 39 | 						<path>/</path>
 40 | 						<contextReloadable>true</contextReloadable>
 41 | 					</configuration>
 42 | 				</plugin>
 43 | 			</plugins>
 44 | 		</pluginManagement>
 45 | 	</build>
 46 | </project>
 47 | ```
 48 | \src\main\java\webapp\LoginServlet.java
 49 | ```
 50 | package webapp;
 51 | 
 52 | import java.io.IOException;
 53 | import java.io.PrintWriter;
 54 | 
 55 | import javax.servlet.annotation.WebServlet;
 56 | import javax.servlet.http.HttpServlet;
 57 | import javax.servlet.http.HttpServletRequest;
 58 | import javax.servlet.http.HttpServletResponse;
 59 | 
 60 | /*
 61 |  * Browser sends Http Request to Web Server
 62 |  * 
 63 |  * Code in Web Server => Input:HttpRequest, Output: HttpResponse
 64 |  * JEE with Servlets
 65 |  * 
 66 |  * Web Server responds with Http Response
 67 |  */
 68 | 
 69 | //Java Platform, Enterprise Edition (Java EE) JEE6
 70 | 
 71 | //Servlet is a Java programming language class 
 72 | //used to extend the capabilities of servers 
 73 | //that host applications accessed by means of 
 74 | //a request-response programming model.
 75 | 
 76 | //1. extends javax.servlet.http.HttpServlet
 77 | //2. @WebServlet(urlPatterns = "/login.do")
 78 | //3. doGet(HttpServletRequest request, HttpServletResponse response)
 79 | //4. How is the response created?
 80 | 
 81 | @WebServlet(urlPatterns = "/login.do")
 82 | public class LoginServlet extends HttpServlet {
 83 | 
 84 | 	@Override
 85 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
 86 | 		PrintWriter out = response.getWriter();
 87 | 		out.println("<html>");
 88 | 		out.println("<head>");
 89 | 		out.println("<title>Yahoo!!!!!!!!</title>");
 90 | 		out.println("</head>");
 91 | 		out.println("<body>");
 92 | 		out.println("My First Servlet");
 93 | 		out.println("</body>");
 94 | 		out.println("</html>");
 95 | 
 96 | 	}
 97 | 
 98 | }
 99 | ```
100 | \src\main\webapp\WEB-INF\web.xml
101 | ```
102 | <!-- webapp/WEB-INF/web.xml -->
103 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
104 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
105 | 	version="3.0">
106 | 
107 | 	<display-name>To do List</display-name>
108 | 
109 | 	<welcome-file-list>
110 | 		<welcome-file>login.do</welcome-file>
111 | 	</welcome-file-list>
112 | 
113 | </web-app>
114 | ```
115 | 


--------------------------------------------------------------------------------
/Step02.md:
--------------------------------------------------------------------------------
  1 | ## What we will do?
  2 | - Create LoginServlet again
  3 | - Redirect to a view - JSP
  4 | 
  5 | ## File Listing
  6 | \pom.xml
  7 | ```
  8 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  9 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 10 | 	<modelVersion>4.0.0</modelVersion>
 11 | 	<groupId>com.in28minutes</groupId>
 12 | 	<artifactId>in28Minutes-first-webapp</artifactId>
 13 | 	<version>0.0.1-SNAPSHOT</version>
 14 | 	<packaging>war</packaging>
 15 | 
 16 | 	<dependencies>
 17 | 		<dependency>
 18 | 			<groupId>javax</groupId>
 19 | 			<artifactId>javaee-web-api</artifactId>
 20 | 			<version>6.0</version>
 21 | 			<scope>provided</scope>
 22 | 		</dependency>
 23 | 	</dependencies>
 24 | 
 25 | 	<build>
 26 | 		<pluginManagement>
 27 | 			<plugins>
 28 | 				<plugin>
 29 | 					<groupId>org.apache.maven.plugins</groupId>
 30 | 					<artifactId>maven-compiler-plugin</artifactId>
 31 | 					<version>3.2</version>
 32 | 					<configuration>
 33 | 						<verbose>true</verbose>
 34 | 						<source>1.7</source>
 35 | 						<target>1.7</target>
 36 | 						<showWarnings>true</showWarnings>
 37 | 					</configuration>
 38 | 				</plugin>
 39 | 				<plugin>
 40 | 					<groupId>org.apache.tomcat.maven</groupId>
 41 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 42 | 					<version>2.2</version>
 43 | 					<configuration>
 44 | 						<path>/</path>
 45 | 						<contextReloadable>true</contextReloadable>
 46 | 					</configuration>
 47 | 				</plugin>
 48 | 			</plugins>
 49 | 		</pluginManagement>
 50 | 	</build>
 51 | </project>
 52 | ```
 53 | \src\main\java\webapp\LoginServlet.java
 54 | ```
 55 | package webapp;
 56 | 
 57 | import java.io.IOException;
 58 | 
 59 | import javax.servlet.ServletException;
 60 | import javax.servlet.annotation.WebServlet;
 61 | import javax.servlet.http.HttpServlet;
 62 | import javax.servlet.http.HttpServletRequest;
 63 | import javax.servlet.http.HttpServletResponse;
 64 | 
 65 | @WebServlet(urlPatterns = "/login.do")
 66 | public class LoginServlet extends HttpServlet {
 67 | 
 68 | 	@Override
 69 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 70 | 			throws IOException, ServletException {
 71 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 72 | 	}
 73 | 
 74 | }
 75 | ```
 76 | \src\main\webapp\WEB-INF\views\login.jsp
 77 | ```
 78 | <html>
 79 | <head>
 80 | <title>Yahoo!!</title>
 81 | </head>
 82 | <body>
 83 | My First JSP!!!
 84 | </body>
 85 | </html>
 86 | ```
 87 | \src\main\webapp\WEB-INF\web.xml
 88 | ```
 89 | <!-- webapp/WEB-INF/web.xml -->
 90 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 91 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
 92 | 	version="3.0">
 93 | 
 94 | 	<display-name>To do List</display-name>
 95 | 
 96 | 	<welcome-file-list>
 97 | 		<welcome-file>login.do</welcome-file>
 98 | 	</welcome-file-list>
 99 | 
100 | </web-app>
101 | ```
102 | 


--------------------------------------------------------------------------------
/Step03.md:
--------------------------------------------------------------------------------
  1 | ## What we will do?
  2 | - Passing a Request Parameter Name
  3 | 
  4 | ## File Listing
  5 | \pom.xml
  6 | ```
  7 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  8 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  9 | 	<modelVersion>4.0.0</modelVersion>
 10 | 	<groupId>com.in28minutes</groupId>
 11 | 	<artifactId>in28Minutes-first-webapp</artifactId>
 12 | 	<version>0.0.1-SNAPSHOT</version>
 13 | 	<packaging>war</packaging>
 14 | 
 15 | 	<dependencies>
 16 | 		<dependency>
 17 | 			<groupId>javax</groupId>
 18 | 			<artifactId>javaee-web-api</artifactId>
 19 | 			<version>6.0</version>
 20 | 			<scope>provided</scope>
 21 | 		</dependency>
 22 | 	</dependencies>
 23 | 
 24 | 	<build>
 25 | 		<pluginManagement>
 26 | 			<plugins>
 27 | 				<plugin>
 28 | 					<groupId>org.apache.maven.plugins</groupId>
 29 | 					<artifactId>maven-compiler-plugin</artifactId>
 30 | 					<version>3.2</version>
 31 | 					<configuration>
 32 | 						<verbose>true</verbose>
 33 | 						<source>1.7</source>
 34 | 						<target>1.7</target>
 35 | 						<showWarnings>true</showWarnings>
 36 | 					</configuration>
 37 | 				</plugin>
 38 | 				<plugin>
 39 | 					<groupId>org.apache.tomcat.maven</groupId>
 40 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 41 | 					<version>2.2</version>
 42 | 					<configuration>
 43 | 						<path>/</path>
 44 | 						<contextReloadable>true</contextReloadable>
 45 | 					</configuration>
 46 | 				</plugin>
 47 | 			</plugins>
 48 | 		</pluginManagement>
 49 | 	</build>
 50 | </project>
 51 | ```
 52 | \src\main\java\webapp\LoginServlet.java
 53 | ```
 54 | package webapp;
 55 | 
 56 | import java.io.IOException;
 57 | 
 58 | import javax.servlet.ServletException;
 59 | import javax.servlet.annotation.WebServlet;
 60 | import javax.servlet.http.HttpServlet;
 61 | import javax.servlet.http.HttpServletRequest;
 62 | import javax.servlet.http.HttpServletResponse;
 63 | 
 64 | @WebServlet(urlPatterns = "/login.do")
 65 | public class LoginServlet extends HttpServlet {
 66 | 
 67 | 	@Override
 68 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 69 | 			throws IOException, ServletException {
 70 | 		request.setAttribute("name", request.getParameter("name"));
 71 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 72 | 	}
 73 | 
 74 | }
 75 | ```
 76 | \src\main\webapp\WEB-INF\views\login.jsp
 77 | ```
 78 | <html>
 79 | <head>
 80 | <title>Yahoo!!</title>
 81 | </head>
 82 | <body>
 83 | My First JSP!!! My name is ${name}
 84 | </body>
 85 | </html>
 86 | ```
 87 | \src\main\webapp\WEB-INF\web.xml
 88 | ```
 89 | <!-- webapp/WEB-INF/web.xml -->
 90 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 91 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
 92 | 	version="3.0">
 93 | 
 94 | 	<display-name>To do List</display-name>
 95 | 
 96 | 	<welcome-file-list>
 97 | 		<welcome-file>login.do</welcome-file>
 98 | 	</welcome-file-list>
 99 | 
100 | </web-app>
101 | ```
102 | 


--------------------------------------------------------------------------------
/Step04.md:
--------------------------------------------------------------------------------
 1 | \pom.xml
 2 | ```
 3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5 | 	<modelVersion>4.0.0</modelVersion>
 6 | 	<groupId>com.in28minutes</groupId>
 7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
 8 | 	<version>0.0.1-SNAPSHOT</version>
 9 | 	<packaging>war</packaging>
10 | 
11 | 	<dependencies>
12 | 		<dependency>
13 | 			<groupId>javax</groupId>
14 | 			<artifactId>javaee-web-api</artifactId>
15 | 			<version>6.0</version>
16 | 			<scope>provided</scope>
17 | 		</dependency>
18 | 	</dependencies>
19 | 
20 | 	<build>
21 | 		<pluginManagement>
22 | 			<plugins>
23 | 				<plugin>
24 | 					<groupId>org.apache.maven.plugins</groupId>
25 | 					<artifactId>maven-compiler-plugin</artifactId>
26 | 					<version>3.2</version>
27 | 					<configuration>
28 | 						<verbose>true</verbose>
29 | 						<source>1.7</source>
30 | 						<target>1.7</target>
31 | 						<showWarnings>true</showWarnings>
32 | 					</configuration>
33 | 				</plugin>
34 | 				<plugin>
35 | 					<groupId>org.apache.tomcat.maven</groupId>
36 | 					<artifactId>tomcat7-maven-plugin</artifactId>
37 | 					<version>2.2</version>
38 | 					<configuration>
39 | 						<path>/</path>
40 | 						<contextReloadable>true</contextReloadable>
41 | 					</configuration>
42 | 				</plugin>
43 | 			</plugins>
44 | 		</pluginManagement>
45 | 	</build>
46 | </project>
47 | ```
48 | \src\main\java\webapp\LoginServlet.java
49 | ```
50 | package webapp;
51 | 
52 | import java.io.IOException;
53 | 
54 | import javax.servlet.ServletException;
55 | import javax.servlet.annotation.WebServlet;
56 | import javax.servlet.http.HttpServlet;
57 | import javax.servlet.http.HttpServletRequest;
58 | import javax.servlet.http.HttpServletResponse;
59 | 
60 | @WebServlet(urlPatterns = "/login.do")
61 | public class LoginServlet extends HttpServlet {
62 | 
63 | 	@Override
64 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
65 | 			throws IOException, ServletException {
66 | 		request.setAttribute("name", request.getParameter("name"));
67 | 		request.setAttribute("password", request.getParameter("password"));
68 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
69 | 	}
70 | 
71 | }
72 | ```
73 | \src\main\webapp\WEB-INF\views\login.jsp
74 | ```
75 | <html>
76 | <head>
77 | <title>Yahoo!!</title>
78 | </head>
79 | <body>
80 | My First JSP!!! My name is ${name} and password is ${password}
81 | </body>
82 | </html>
83 | ```
84 | \src\main\webapp\WEB-INF\web.xml
85 | ```
86 | <!-- webapp/WEB-INF/web.xml -->
87 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
88 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
89 | 	version="3.0">
90 | 
91 | 	<display-name>To do List</display-name>
92 | 
93 | 	<welcome-file-list>
94 | 		<welcome-file>login.do</welcome-file>
95 | 	</welcome-file-list>
96 | 
97 | </web-app>
98 | ```
99 | 


--------------------------------------------------------------------------------
/Step05.md:
--------------------------------------------------------------------------------
  1 | \pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 | 	</dependencies>
 19 | 
 20 | 	<build>
 21 | 		<pluginManagement>
 22 | 			<plugins>
 23 | 				<plugin>
 24 | 					<groupId>org.apache.maven.plugins</groupId>
 25 | 					<artifactId>maven-compiler-plugin</artifactId>
 26 | 					<version>3.2</version>
 27 | 					<configuration>
 28 | 						<verbose>true</verbose>
 29 | 						<source>1.7</source>
 30 | 						<target>1.7</target>
 31 | 						<showWarnings>true</showWarnings>
 32 | 					</configuration>
 33 | 				</plugin>
 34 | 				<plugin>
 35 | 					<groupId>org.apache.tomcat.maven</groupId>
 36 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 37 | 					<version>2.2</version>
 38 | 					<configuration>
 39 | 						<path>/</path>
 40 | 						<contextReloadable>true</contextReloadable>
 41 | 					</configuration>
 42 | 				</plugin>
 43 | 			</plugins>
 44 | 		</pluginManagement>
 45 | 	</build>
 46 | </project>
 47 | ```
 48 | \src\main\java\webapp\LoginServlet.java
 49 | ```
 50 | package webapp;
 51 | 
 52 | import java.io.IOException;
 53 | 
 54 | import javax.servlet.ServletException;
 55 | import javax.servlet.annotation.WebServlet;
 56 | import javax.servlet.http.HttpServlet;
 57 | import javax.servlet.http.HttpServletRequest;
 58 | import javax.servlet.http.HttpServletResponse;
 59 | 
 60 | 
 61 | @WebServlet(urlPatterns = "/login.do")
 62 | public class LoginServlet extends HttpServlet {
 63 | 
 64 | 
 65 | 	@Override
 66 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 67 | 			throws IOException, ServletException {
 68 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 69 | 	}
 70 | 
 71 | }
 72 | ```
 73 | \\src\main\webapp\WEB-INF\views\login.jsp
 74 | ```
 75 | <html>
 76 | <head>
 77 | <title>Yahoo!!</title>
 78 | </head>
 79 | <body>
 80 | 	<form action="/login.do" method="POST">
 81 | 		Name : <input type="text" /> <input type="submit" />
 82 | 	</form>
 83 | </body>
 84 | </html>
 85 | ```
 86 | \src\main\webapp\WEB-INF\views\welcome.jsp
 87 | ```
 88 | <html>
 89 | <head>
 90 | <title>Yahoo!!</title>
 91 | </head>
 92 | <body>
 93 | Welcome ${name}
 94 | </body>
 95 | </html>
 96 | ```
 97 | \src\main\webapp\WEB-INF\web.xml
 98 | ```
 99 | <!-- webapp/WEB-INF/web.xml -->
100 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
101 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
102 | 	version="3.0">
103 | 
104 | 	<display-name>To do List</display-name>
105 | 
106 | 	<welcome-file-list>
107 | 		<welcome-file>login.do</welcome-file>
108 | 	</welcome-file-list>
109 | 
110 | </web-app>
111 | ```
112 | 


--------------------------------------------------------------------------------
/Step06.md:
--------------------------------------------------------------------------------
  1 | \pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 | 	</dependencies>
 19 | 
 20 | 	<build>
 21 | 		<pluginManagement>
 22 | 			<plugins>
 23 | 				<plugin>
 24 | 					<groupId>org.apache.maven.plugins</groupId>
 25 | 					<artifactId>maven-compiler-plugin</artifactId>
 26 | 					<version>3.2</version>
 27 | 					<configuration>
 28 | 						<verbose>true</verbose>
 29 | 						<source>1.7</source>
 30 | 						<target>1.7</target>
 31 | 						<showWarnings>true</showWarnings>
 32 | 					</configuration>
 33 | 				</plugin>
 34 | 				<plugin>
 35 | 					<groupId>org.apache.tomcat.maven</groupId>
 36 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 37 | 					<version>2.2</version>
 38 | 					<configuration>
 39 | 						<path>/</path>
 40 | 						<contextReloadable>true</contextReloadable>
 41 | 					</configuration>
 42 | 				</plugin>
 43 | 			</plugins>
 44 | 		</pluginManagement>
 45 | 	</build>
 46 | </project>
 47 | ```
 48 | \src\main\java\webapp\LoginServlet.java
 49 | ```
 50 | package webapp;
 51 | 
 52 | import java.io.IOException;
 53 | 
 54 | import javax.servlet.ServletException;
 55 | import javax.servlet.annotation.WebServlet;
 56 | import javax.servlet.http.HttpServlet;
 57 | import javax.servlet.http.HttpServletRequest;
 58 | import javax.servlet.http.HttpServletResponse;
 59 | 
 60 | 
 61 | @WebServlet(urlPatterns = "/login.do")
 62 | public class LoginServlet extends HttpServlet {
 63 | 
 64 | 
 65 | 	@Override
 66 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 67 | 			throws IOException, ServletException {
 68 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 69 | 	}
 70 | 
 71 | 	@Override
 72 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
 73 | 			throws IOException, ServletException {
 74 | 		request.setAttribute("name", request.getParameter("name"));
 75 | 		request.getRequestDispatcher("/WEB-INF/views/welcome.jsp").forward(request, response);
 76 | 	}
 77 | 
 78 | }
 79 | ```
 80 | \\src\main\webapp\WEB-INF\views\login.jsp
 81 | ```
 82 | <html>
 83 | <head>
 84 | <title>Yahoo!!</title>
 85 | </head>
 86 | <body>
 87 | 	<form action="/login.do" method="POST">
 88 | 		Name : <input name="name" type="text" /> <input type="submit" />
 89 | 	</form>
 90 | </body>
 91 | </html>
 92 | ```
 93 | \src\main\webapp\WEB-INF\views\welcome.jsp
 94 | ```
 95 | <html>
 96 | <head>
 97 | <title>Yahoo!!</title>
 98 | </head>
 99 | <body>
100 | Welcome ${name}
101 | </body>
102 | </html>
103 | ```
104 | \src\main\webapp\WEB-INF\web.xml
105 | ```
106 | <!-- webapp/WEB-INF/web.xml -->
107 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
108 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
109 | 	version="3.0">
110 | 
111 | 	<display-name>To do List</display-name>
112 | 
113 | 	<welcome-file-list>
114 | 		<welcome-file>login.do</welcome-file>
115 | 	</welcome-file-list>
116 | </web-app>
117 | ```
118 | 


--------------------------------------------------------------------------------
/Step07.md:
--------------------------------------------------------------------------------
  1 | \pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 | 	</dependencies>
 19 | 
 20 | 	<build>
 21 | 		<pluginManagement>
 22 | 			<plugins>
 23 | 				<plugin>
 24 | 					<groupId>org.apache.maven.plugins</groupId>
 25 | 					<artifactId>maven-compiler-plugin</artifactId>
 26 | 					<version>3.2</version>
 27 | 					<configuration>
 28 | 						<verbose>true</verbose>
 29 | 						<source>1.7</source>
 30 | 						<target>1.7</target>
 31 | 						<showWarnings>true</showWarnings>
 32 | 					</configuration>
 33 | 				</plugin>
 34 | 				<plugin>
 35 | 					<groupId>org.apache.tomcat.maven</groupId>
 36 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 37 | 					<version>2.2</version>
 38 | 					<configuration>
 39 | 						<path>/</path>
 40 | 						<contextReloadable>true</contextReloadable>
 41 | 					</configuration>
 42 | 				</plugin>
 43 | 			</plugins>
 44 | 		</pluginManagement>
 45 | 	</build>
 46 | </project>
 47 | ```
 48 | \src\main\java\webapp\LoginService.java
 49 | ```
 50 | package webapp;
 51 | 
 52 | public class LoginService {
 53 | 	public boolean validateUser(String user, String password) {
 54 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
 55 | 	}
 56 | 
 57 | }
 58 | ```
 59 | \src\main\java\webapp\LoginServlet.java
 60 | ```
 61 | package webapp;
 62 | 
 63 | import java.io.IOException;
 64 | 
 65 | import javax.servlet.ServletException;
 66 | import javax.servlet.annotation.WebServlet;
 67 | import javax.servlet.http.HttpServlet;
 68 | import javax.servlet.http.HttpServletRequest;
 69 | import javax.servlet.http.HttpServletResponse;
 70 | 
 71 | 
 72 | @WebServlet(urlPatterns = "/login.do")
 73 | public class LoginServlet extends HttpServlet {
 74 | 
 75 | 	private LoginService service = new LoginService();
 76 | 
 77 | 	@Override
 78 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 79 | 			throws IOException, ServletException {
 80 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 81 | 	}
 82 | 
 83 | 	@Override
 84 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
 85 | 			throws IOException, ServletException {
 86 | 		String name = request.getParameter("name");
 87 | 		String password = request.getParameter("password");
 88 | 
 89 | 		boolean isValidUser = service.validateUser(name, password);
 90 | 
 91 | 		if (isValidUser) {
 92 | 			request.setAttribute("name", name);
 93 | 			request.getRequestDispatcher("/WEB-INF/views/welcome.jsp").forward(request, response);
 94 | 		} else {
 95 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
 96 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 97 | 		}
 98 | 	}
 99 | 
100 | }
101 | ```
102 | \\src\main\webapp\WEB-INF\views\login.jsp
103 | ```
104 | <html>
105 | <head>
106 | <title>Yahoo!!</title>
107 | </head>
108 | <body>
109 | 	<p><font color="red">${errorMessage}</font></p>
110 | 	<form action="/login.do" method="POST">
111 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
112 | 	</form>
113 | </body>
114 | </html>
115 | ```
116 | \src\main\webapp\WEB-INF\views\welcome.jsp
117 | ```
118 | <html>
119 | <head>
120 | <title>Yahoo!!</title>
121 | </head>
122 | <body>
123 | Welcome ${name}
124 | </body>
125 | </html>
126 | ```
127 | \src\main\webapp\WEB-INF\web.xml
128 | ```
129 | <!-- webapp/WEB-INF/web.xml -->
130 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
131 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
132 | 	version="3.0">
133 | 
134 | 	<display-name>To do List</display-name>
135 | 
136 | 	<welcome-file-list>
137 | 		<welcome-file>login.do</welcome-file>
138 | 	</welcome-file-list>
139 | </web-app>
140 | ```
141 | 


--------------------------------------------------------------------------------
/Step08.md:
--------------------------------------------------------------------------------
  1 | \pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 | 	</dependencies>
 19 | 
 20 | 	<build>
 21 | 		<pluginManagement>
 22 | 			<plugins>
 23 | 				<plugin>
 24 | 					<groupId>org.apache.maven.plugins</groupId>
 25 | 					<artifactId>maven-compiler-plugin</artifactId>
 26 | 					<version>3.2</version>
 27 | 					<configuration>
 28 | 						<verbose>true</verbose>
 29 | 						<source>1.7</source>
 30 | 						<target>1.7</target>
 31 | 						<showWarnings>true</showWarnings>
 32 | 					</configuration>
 33 | 				</plugin>
 34 | 				<plugin>
 35 | 					<groupId>org.apache.tomcat.maven</groupId>
 36 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 37 | 					<version>2.2</version>
 38 | 					<configuration>
 39 | 						<path>/</path>
 40 | 						<contextReloadable>true</contextReloadable>
 41 | 					</configuration>
 42 | 				</plugin>
 43 | 			</plugins>
 44 | 		</pluginManagement>
 45 | 	</build>
 46 | </project>
 47 | ```
 48 | \src\main\java\webapp\LoginService.java
 49 | ```
 50 | package webapp;
 51 | 
 52 | public class LoginService {
 53 | 	public boolean validateUser(String user, String password) {
 54 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
 55 | 	}
 56 | 
 57 | }
 58 | ```
 59 | \src\main\java\webapp\LoginServlet.java
 60 | ```
 61 | package webapp;
 62 | 
 63 | import java.io.IOException;
 64 | 
 65 | import javax.servlet.ServletException;
 66 | import javax.servlet.annotation.WebServlet;
 67 | import javax.servlet.http.HttpServlet;
 68 | import javax.servlet.http.HttpServletRequest;
 69 | import javax.servlet.http.HttpServletResponse;
 70 | 
 71 | 
 72 | import webapp.todo.TodoService;
 73 | 
 74 | @WebServlet(urlPatterns = "/login.do")
 75 | public class LoginServlet extends HttpServlet {
 76 | 
 77 | 	private LoginService service = new LoginService();
 78 | 	private TodoService todoService = new TodoService();
 79 | 
 80 | 	@Override
 81 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 82 | 			throws IOException, ServletException {
 83 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 84 | 	}
 85 | 
 86 | 	@Override
 87 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
 88 | 			throws IOException, ServletException {
 89 | 		String name = request.getParameter("name");
 90 | 		String password = request.getParameter("password");
 91 | 
 92 | 		boolean isValidUser = service.validateUser(name, password);
 93 | 
 94 | 		if (isValidUser) {
 95 | 			request.setAttribute("name", name);
 96 | 			request.setAttribute("todos", todoService.retrieveTodos());
 97 | 			request.getRequestDispatcher("/WEB-INF/views/welcome.jsp").forward(request, response);
 98 | 		} else {
 99 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
100 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
101 | 		}
102 | 	}
103 | 
104 | }
105 | ```
106 | \src\main\java\webapp\todo\Todo.java
107 | ```
108 | package webapp.todo;
109 | 
110 | public class Todo {
111 | 
112 | 	public Todo(String name) {
113 | 		super();
114 | 		this.name = name;
115 | 	}
116 | 
117 | 	private String name;
118 | 
119 | 	public String getName() {
120 | 		return name;
121 | 	}
122 | 
123 | 	public void setName(String name) {
124 | 		this.name = name;
125 | 	}
126 | 
127 | 	@Override
128 | 	public String toString() {
129 | 		return "Todo [name=" + name + "]";
130 | 	}
131 | }
132 | ```
133 | \src\main\java\webapp\todo\TodoService.java
134 | ```
135 | package webapp.todo;
136 | 
137 | import java.util.ArrayList;
138 | import java.util.List;
139 | 
140 | public class TodoService {
141 | 	private static List<Todo> todos = new ArrayList();
142 | 
143 | 	static {
144 | 		todos.add(new Todo("Learn Web Application"));
145 | 		todos.add(new Todo("Learn Spring"));
146 | 		todos.add(new Todo("Learn Spring MVC"));
147 | 	}
148 | 
149 | 	public List<Todo> retrieveTodos() {
150 | 		return todos;
151 | 	}
152 | }
153 | ```
154 | \\src\main\webapp\WEB-INF\views\login.jsp
155 | ```
156 | <html>
157 | <head>
158 | <title>Yahoo!!</title>
159 | </head>
160 | <body>
161 | 	<p><font color="red">${errorMessage}</font></p>
162 | 	<form action="/login.do" method="POST">
163 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
164 | 	</form>
165 | </body>
166 | </html>
167 | ```
168 | \src\main\webapp\WEB-INF\views\welcome.jsp
169 | ```
170 | <html>
171 | <head>
172 | <title>Yahoo!!</title>
173 | </head>
174 | <body>
175 | <H1>Welcome ${name}</H2>
176 | <div>
177 | Your Todos are
178 | ${todos}
179 | </div>
180 | </body>
181 | </html>
182 | ```
183 | \src\main\webapp\WEB-INF\web.xml
184 | ```
185 | <!-- webapp/WEB-INF/web.xml -->
186 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
187 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
188 | 	version="3.0">
189 | 
190 | 	<display-name>To do List</display-name>
191 | 
192 | 	<welcome-file-list>
193 | 		<welcome-file>login.do</welcome-file>
194 | 	</welcome-file-list>
195 | </web-app>
196 | ```
197 | 


--------------------------------------------------------------------------------
/Step09.md:
--------------------------------------------------------------------------------
  1 | pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 | 	</dependencies>
 19 | 
 20 | 	<build>
 21 | 		<pluginManagement>
 22 | 			<plugins>
 23 | 				<plugin>
 24 | 					<groupId>org.apache.maven.plugins</groupId>
 25 | 					<artifactId>maven-compiler-plugin</artifactId>
 26 | 					<version>3.2</version>
 27 | 					<configuration>
 28 | 						<verbose>true</verbose>
 29 | 						<source>1.7</source>
 30 | 						<target>1.7</target>
 31 | 						<showWarnings>true</showWarnings>
 32 | 					</configuration>
 33 | 				</plugin>
 34 | 				<plugin>
 35 | 					<groupId>org.apache.tomcat.maven</groupId>
 36 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 37 | 					<version>2.2</version>
 38 | 					<configuration>
 39 | 						<path>/</path>
 40 | 						<contextReloadable>true</contextReloadable>
 41 | 					</configuration>
 42 | 				</plugin>
 43 | 			</plugins>
 44 | 		</pluginManagement>
 45 | 	</build>
 46 | </project>
 47 | ```
 48 | src\main\java\in28minutes\login\LoginService.java
 49 | ```
 50 | package in28minutes.login;
 51 | 
 52 | public class LoginService {
 53 | 	public boolean validateUser(String user, String password) {
 54 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
 55 | 	}
 56 | 
 57 | }
 58 | ```
 59 | src\main\java\in28minutes\login\LoginServlet.java
 60 | ```
 61 | package in28minutes.login;
 62 | 
 63 | import java.io.IOException;
 64 | 
 65 | import javax.servlet.ServletException;
 66 | import javax.servlet.annotation.WebServlet;
 67 | import javax.servlet.http.HttpServlet;
 68 | import javax.servlet.http.HttpServletRequest;
 69 | import javax.servlet.http.HttpServletResponse;
 70 | 
 71 | 
 72 | import in28minutes.todo.TodoService;
 73 | 
 74 | @WebServlet(urlPatterns = "/login.do")
 75 | public class LoginServlet extends HttpServlet {
 76 | 
 77 | 	private static final long serialVersionUID = 1L;
 78 | 	private LoginService service = new LoginService();
 79 | 	private TodoService todoService = new TodoService();
 80 | 
 81 | 	@Override
 82 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 83 | 			throws IOException, ServletException {
 84 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 85 | 	}
 86 | 
 87 | 	@Override
 88 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
 89 | 			throws IOException, ServletException {
 90 | 		String name = request.getParameter("name");
 91 | 		String password = request.getParameter("password");
 92 | 
 93 | 		boolean isValidUser = service.validateUser(name, password);
 94 | 
 95 | 		if (isValidUser) {
 96 | 			request.setAttribute("name", name);
 97 | 			request.setAttribute("todos", todoService.retrieveTodos());
 98 | 			request.getRequestDispatcher("/WEB-INF/views/welcome.jsp").forward(request, response);
 99 | 		} else {
100 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
101 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
102 | 		}
103 | 	}
104 | 
105 | }
106 | ```
107 | src\main\java\in28minutes\todo\Todo.java
108 | ```
109 | package in28minutes.todo;
110 | 
111 | public class Todo {
112 | 
113 | 	public Todo(String name) {
114 | 		super();
115 | 		this.name = name;
116 | 	}
117 | 
118 | 	private String name;
119 | 
120 | 	public String getName() {
121 | 		return name;
122 | 	}
123 | 
124 | 	public void setName(String name) {
125 | 		this.name = name;
126 | 	}
127 | 
128 | 	@Override
129 | 	public String toString() {
130 | 		return "Todo [name=" + name + "]";
131 | 	}
132 | }
133 | ```
134 | src\main\java\in28minutes\todo\TodoService.java
135 | ```
136 | package in28minutes.todo;
137 | 
138 | import java.util.ArrayList;
139 | import java.util.List;
140 | 
141 | public class TodoService {
142 | 	private static List<Todo> todos = new ArrayList<Todo>();
143 | 
144 | 	static {
145 | 		todos.add(new Todo("Learn Web Application"));
146 | 		todos.add(new Todo("Learn Spring"));
147 | 		todos.add(new Todo("Learn Spring MVC"));
148 | 	}
149 | 
150 | 	public List<Todo> retrieveTodos() {
151 | 		return todos;
152 | 	}
153 | }
154 | ```
155 | src\main\webapp\WEB-INF\views\login.jsp
156 | ```
157 | <html>
158 | <head>
159 | <title>Yahoo!!</title>
160 | </head>
161 | <body>
162 | 	<p><font color="red">${errorMessage}</font></p>
163 | 	<form action="/login.do" method="POST">
164 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
165 | 	</form>
166 | </body>
167 | </html>
168 | ```
169 | src\main\webapp\WEB-INF\views\welcome.jsp
170 | ```
171 | <html>
172 | <head>
173 | <title>Yahoo!!</title>
174 | </head>
175 | <body>
176 | <H1>Welcome ${name}</H2>
177 | <div>
178 | Your Todos are
179 | ${todos}
180 | </div>
181 | </body>
182 | </html>
183 | ```
184 | src\main\webapp\WEB-INF\web.xml
185 | ```
186 | <!-- webapp/WEB-INF/web.xml -->
187 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
188 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
189 | 	version="3.0">
190 | 
191 | 	<display-name>To do List</display-name>
192 | 
193 | 	<welcome-file-list>
194 | 		<welcome-file>login.do</welcome-file>
195 | 	</welcome-file-list>
196 | </web-app>
197 | ```
198 | 


--------------------------------------------------------------------------------
/Step10.md:
--------------------------------------------------------------------------------
  1 | pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 | 	</dependencies>
 19 | 
 20 | 	<build>
 21 | 		<pluginManagement>
 22 | 			<plugins>
 23 | 				<plugin>
 24 | 					<groupId>org.apache.maven.plugins</groupId>
 25 | 					<artifactId>maven-compiler-plugin</artifactId>
 26 | 					<version>3.2</version>
 27 | 					<configuration>
 28 | 						<verbose>true</verbose>
 29 | 						<source>1.7</source>
 30 | 						<target>1.7</target>
 31 | 						<showWarnings>true</showWarnings>
 32 | 					</configuration>
 33 | 				</plugin>
 34 | 				<plugin>
 35 | 					<groupId>org.apache.tomcat.maven</groupId>
 36 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 37 | 					<version>2.2</version>
 38 | 					<configuration>
 39 | 						<path>/</path>
 40 | 						<contextReloadable>true</contextReloadable>
 41 | 					</configuration>
 42 | 				</plugin>
 43 | 			</plugins>
 44 | 		</pluginManagement>
 45 | 	</build>
 46 | </project>
 47 | ```
 48 | src\main\java\in28minutes\login\LoginService.java
 49 | ```
 50 | package in28minutes.login;
 51 | 
 52 | public class LoginService {
 53 | 	public boolean validateUser(String user, String password) {
 54 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
 55 | 	}
 56 | 
 57 | }
 58 | ```
 59 | src\main\java\in28minutes\login\LoginServlet.java
 60 | ```
 61 | package in28minutes.login;
 62 | 
 63 | import java.io.IOException;
 64 | 
 65 | import javax.servlet.ServletException;
 66 | import javax.servlet.annotation.WebServlet;
 67 | import javax.servlet.http.HttpServlet;
 68 | import javax.servlet.http.HttpServletRequest;
 69 | import javax.servlet.http.HttpServletResponse;
 70 | 
 71 | 
 72 | @WebServlet(urlPatterns = "/login.do")
 73 | public class LoginServlet extends HttpServlet {
 74 | 
 75 | 	private static final long serialVersionUID = 1L;
 76 | 	private LoginService service = new LoginService();
 77 | 
 78 | 	@Override
 79 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 80 | 			throws IOException, ServletException {
 81 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 82 | 	}
 83 | 
 84 | 	@Override
 85 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
 86 | 			throws IOException, ServletException {
 87 | 		String name = request.getParameter("name");
 88 | 		String password = request.getParameter("password");
 89 | 
 90 | 		boolean isValidUser = service.validateUser(name, password);
 91 | 
 92 | 		if (isValidUser) {
 93 | 			response.sendRedirect("/todo.do");
 94 | 		} else {
 95 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
 96 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 97 | 		}
 98 | 	}
 99 | 
100 | }
101 | ```
102 | src\main\java\in28minutes\todo\Todo.java
103 | ```
104 | package in28minutes.todo;
105 | 
106 | public class Todo {
107 | 
108 | 	public Todo(String name) {
109 | 		super();
110 | 		this.name = name;
111 | 	}
112 | 
113 | 	private String name;
114 | 
115 | 	public String getName() {
116 | 		return name;
117 | 	}
118 | 
119 | 	public void setName(String name) {
120 | 		this.name = name;
121 | 	}
122 | 
123 | 	@Override
124 | 	public String toString() {
125 | 		return "Todo [name=" + name + "]";
126 | 	}
127 | }
128 | ```
129 | src\main\java\in28minutes\todo\TodoService.java
130 | ```
131 | package in28minutes.todo;
132 | 
133 | import java.util.ArrayList;
134 | import java.util.List;
135 | 
136 | public class TodoService {
137 | 	private static List<Todo> todos = new ArrayList<Todo>();
138 | 
139 | 	static {
140 | 		todos.add(new Todo("Learn Web Application"));
141 | 		todos.add(new Todo("Learn Spring"));
142 | 		todos.add(new Todo("Learn Spring MVC"));
143 | 	}
144 | 
145 | 	public List<Todo> retrieveTodos() {
146 | 		return todos;
147 | 	}
148 | }
149 | ```
150 | src\main\java\in28minutes\todo\TodoServlet.java
151 | ```
152 | package in28minutes.todo;
153 | 
154 | import java.io.IOException;
155 | 
156 | import javax.servlet.ServletException;
157 | import javax.servlet.annotation.WebServlet;
158 | import javax.servlet.http.HttpServlet;
159 | import javax.servlet.http.HttpServletRequest;
160 | import javax.servlet.http.HttpServletResponse;
161 | 
162 | @WebServlet(urlPatterns = "/todo.do")
163 | public class TodoServlet extends HttpServlet {
164 | 
165 | 	private static final long serialVersionUID = 1L;
166 | 	private TodoService todoService = new TodoService();
167 | 
168 | 	@Override
169 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
170 | 			throws IOException, ServletException {
171 | 		request.setAttribute("todos", todoService.retrieveTodos());
172 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
173 | 	}
174 | }
175 | ```
176 | src\main\webapp\WEB-INF\views\login.jsp
177 | ```
178 | <html>
179 | <head>
180 | <title>Yahoo!!</title>
181 | </head>
182 | <body>
183 | 	<p><font color="red">${errorMessage}</font></p>
184 | 	<form action="/login.do" method="POST">
185 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
186 | 	</form>
187 | </body>
188 | </html>
189 | ```
190 | src\main\webapp\WEB-INF\views\todo.jsp
191 | ```
192 | <html>
193 | <head>
194 | <title>Yahoo!!</title>
195 | </head>
196 | <body>
197 | <H1>Welcome ${name}</H2>
198 | <div>
199 | Your Todos are
200 | ${todos}
201 | </div>
202 | </body>
203 | </html>
204 | ```
205 | src\main\webapp\WEB-INF\web.xml
206 | ```
207 | <!-- webapp/WEB-INF/web.xml -->
208 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
209 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
210 | 	version="3.0">
211 | 
212 | 	<display-name>To do List</display-name>
213 | 
214 | 	<welcome-file-list>
215 | 		<welcome-file>login.do</welcome-file>
216 | 	</welcome-file-list>
217 | </web-app>
218 | ```
219 | 


--------------------------------------------------------------------------------
/Step11.md:
--------------------------------------------------------------------------------
  1 | pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 |         <dependency>
 19 |             <groupId>javax.servlet</groupId>
 20 |             <artifactId>jstl</artifactId>
 21 |             <version>1.2</version>
 22 |         </dependency>
 23 | 		
 24 | 	</dependencies>
 25 | 
 26 | 	<build>
 27 | 		<pluginManagement>
 28 | 			<plugins>
 29 | 				<plugin>
 30 | 					<groupId>org.apache.maven.plugins</groupId>
 31 | 					<artifactId>maven-compiler-plugin</artifactId>
 32 | 					<version>3.2</version>
 33 | 					<configuration>
 34 | 						<verbose>true</verbose>
 35 | 						<source>1.7</source>
 36 | 						<target>1.7</target>
 37 | 						<showWarnings>true</showWarnings>
 38 | 					</configuration>
 39 | 				</plugin>
 40 | 				<plugin>
 41 | 					<groupId>org.apache.tomcat.maven</groupId>
 42 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 43 | 					<version>2.2</version>
 44 | 					<configuration>
 45 | 						<path>/</path>
 46 | 						<contextReloadable>true</contextReloadable>
 47 | 					</configuration>
 48 | 				</plugin>
 49 | 			</plugins>
 50 | 		</pluginManagement>
 51 | 	</build>
 52 | </project>
 53 | ```
 54 | src\main\java\in28minutes\login\LoginService.java
 55 | ```
 56 | package in28minutes.login;
 57 | 
 58 | public class LoginService {
 59 | 	public boolean validateUser(String user, String password) {
 60 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
 61 | 	}
 62 | 
 63 | }
 64 | ```
 65 | src\main\java\in28minutes\login\LoginServlet.java
 66 | ```
 67 | package in28minutes.login;
 68 | 
 69 | import java.io.IOException;
 70 | 
 71 | import javax.servlet.ServletException;
 72 | import javax.servlet.annotation.WebServlet;
 73 | import javax.servlet.http.HttpServlet;
 74 | import javax.servlet.http.HttpServletRequest;
 75 | import javax.servlet.http.HttpServletResponse;
 76 | 
 77 | 
 78 | @WebServlet(urlPatterns = "/login.do")
 79 | public class LoginServlet extends HttpServlet {
 80 | 
 81 | 	private static final long serialVersionUID = 1L;
 82 | 	private LoginService service = new LoginService();
 83 | 
 84 | 	@Override
 85 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 86 | 			throws IOException, ServletException {
 87 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 88 | 	}
 89 | 
 90 | 	@Override
 91 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
 92 | 			throws IOException, ServletException {
 93 | 		String name = request.getParameter("name");
 94 | 		String password = request.getParameter("password");
 95 | 
 96 | 		boolean isValidUser = service.validateUser(name, password);
 97 | 
 98 | 		if (isValidUser) {
 99 | 			response.sendRedirect("/todo.do");
100 | 		} else {
101 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
102 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
103 | 		}
104 | 	}
105 | 
106 | }
107 | ```
108 | src\main\java\in28minutes\todo\Todo.java
109 | ```
110 | package in28minutes.todo;
111 | 
112 | public class Todo {
113 | 
114 | 	public Todo(String name) {
115 | 		super();
116 | 		this.name = name;
117 | 	}
118 | 
119 | 	private String name;
120 | 
121 | 	public String getName() {
122 | 		return name;
123 | 	}
124 | 
125 | 	public void setName(String name) {
126 | 		this.name = name;
127 | 	}
128 | 
129 | 	@Override
130 | 	public String toString() {
131 | 		return "Todo [name=" + name + "]";
132 | 	}
133 | }
134 | ```
135 | src\main\java\in28minutes\todo\TodoService.java
136 | ```
137 | package in28minutes.todo;
138 | 
139 | import java.util.ArrayList;
140 | import java.util.List;
141 | 
142 | public class TodoService {
143 | 	private static List<Todo> todos = new ArrayList<Todo>();
144 | 
145 | 	static {
146 | 		todos.add(new Todo("Learn Web Application"));
147 | 		todos.add(new Todo("Learn Spring"));
148 | 		todos.add(new Todo("Learn Spring MVC"));
149 | 	}
150 | 
151 | 	public List<Todo> retrieveTodos() {
152 | 		return todos;
153 | 	}
154 | }
155 | ```
156 | src\main\java\in28minutes\todo\TodoServlet.java
157 | ```
158 | package in28minutes.todo;
159 | 
160 | import java.io.IOException;
161 | 
162 | import javax.servlet.ServletException;
163 | import javax.servlet.annotation.WebServlet;
164 | import javax.servlet.http.HttpServlet;
165 | import javax.servlet.http.HttpServletRequest;
166 | import javax.servlet.http.HttpServletResponse;
167 | 
168 | @WebServlet(urlPatterns = "/todo.do")
169 | public class TodoServlet extends HttpServlet {
170 | 
171 | 	private static final long serialVersionUID = 1L;
172 | 	private TodoService todoService = new TodoService();
173 | 
174 | 	@Override
175 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
176 | 			throws IOException, ServletException {
177 | 		request.setAttribute("todos", todoService.retrieveTodos());
178 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
179 | 	}
180 | }
181 | ```
182 | src\main\webapp\WEB-INF\views\login.jsp
183 | ```
184 | <html>
185 | <head>
186 | <title>Yahoo!!</title>
187 | </head>
188 | <body>
189 | 	<p><font color="red">${errorMessage}</font></p>
190 | 	<form action="/login.do" method="POST">
191 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
192 | 	</form>
193 | </body>
194 | </html>
195 | ```
196 | src\main\webapp\WEB-INF\views\todo.jsp
197 | ```
198 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
199 | <html>
200 | <head>
201 | <title>Yahoo!!</title>
202 | </head>
203 | <body>
204 | <H1>Welcome ${name}</H2>
205 | <div>
206 | Your Todos are
207 | <ol>
208 | <c:forEach items="${todos}" var="todo">
209 |    <li>${todo.name}</li>
210 | </c:forEach>
211 | </ol>
212 | </div>
213 | </body>
214 | </html>
215 | ```
216 | src\main\webapp\WEB-INF\web.xml
217 | ```
218 | <!-- webapp/WEB-INF/web.xml -->
219 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
220 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
221 | 	version="3.0">
222 | 
223 | 	<display-name>To do List</display-name>
224 | 
225 | 	<welcome-file-list>
226 | 		<welcome-file>login.do</welcome-file>
227 | 	</welcome-file-list>
228 | </web-app>
229 | ```
230 | 


--------------------------------------------------------------------------------
/Step13.md:
--------------------------------------------------------------------------------
  1 | pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 |         <dependency>
 19 |             <groupId>javax.servlet</groupId>
 20 |             <artifactId>jstl</artifactId>
 21 |             <version>1.2</version>
 22 |         </dependency>
 23 | 		
 24 | 	</dependencies>
 25 | 
 26 | 	<build>
 27 | 		<pluginManagement>
 28 | 			<plugins>
 29 | 				<plugin>
 30 | 					<groupId>org.apache.maven.plugins</groupId>
 31 | 					<artifactId>maven-compiler-plugin</artifactId>
 32 | 					<version>3.2</version>
 33 | 					<configuration>
 34 | 						<verbose>true</verbose>
 35 | 						<source>1.7</source>
 36 | 						<target>1.7</target>
 37 | 						<showWarnings>true</showWarnings>
 38 | 					</configuration>
 39 | 				</plugin>
 40 | 				<plugin>
 41 | 					<groupId>org.apache.tomcat.maven</groupId>
 42 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 43 | 					<version>2.2</version>
 44 | 					<configuration>
 45 | 						<path>/</path>
 46 | 						<contextReloadable>true</contextReloadable>
 47 | 					</configuration>
 48 | 				</plugin>
 49 | 			</plugins>
 50 | 		</pluginManagement>
 51 | 	</build>
 52 | </project>
 53 | ```
 54 | src\main\java\in28minutes\login\LoginService.java
 55 | ```
 56 | package in28minutes.login;
 57 | 
 58 | public class LoginService {
 59 | 	public boolean validateUser(String user, String password) {
 60 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
 61 | 	}
 62 | 
 63 | }
 64 | ```
 65 | src\main\java\in28minutes\login\LoginServlet.java
 66 | ```
 67 | package in28minutes.login;
 68 | 
 69 | import java.io.IOException;
 70 | 
 71 | import javax.servlet.ServletException;
 72 | import javax.servlet.annotation.WebServlet;
 73 | import javax.servlet.http.HttpServlet;
 74 | import javax.servlet.http.HttpServletRequest;
 75 | import javax.servlet.http.HttpServletResponse;
 76 | 
 77 | 
 78 | @WebServlet(urlPatterns = "/login.do")
 79 | public class LoginServlet extends HttpServlet {
 80 | 
 81 | 	private static final long serialVersionUID = 1L;
 82 | 	private LoginService service = new LoginService();
 83 | 
 84 | 	@Override
 85 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 86 | 			throws IOException, ServletException {
 87 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 88 | 	}
 89 | 
 90 | 	@Override
 91 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
 92 | 			throws IOException, ServletException {
 93 | 		String name = request.getParameter("name");
 94 | 		String password = request.getParameter("password");
 95 | 
 96 | 		boolean isValidUser = service.validateUser(name, password);
 97 | 
 98 | 		if (isValidUser) {
 99 | 			response.sendRedirect("/todo.do");
100 | 		} else {
101 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
102 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
103 | 		}
104 | 	}
105 | 
106 | }
107 | ```
108 | src\main\java\in28minutes\todo\Todo.java
109 | ```
110 | package in28minutes.todo;
111 | 
112 | public class Todo {
113 | 
114 | 	public Todo(String name) {
115 | 		super();
116 | 		this.name = name;
117 | 	}
118 | 
119 | 	private String name;
120 | 
121 | 	public String getName() {
122 | 		return name;
123 | 	}
124 | 
125 | 	public void setName(String name) {
126 | 		this.name = name;
127 | 	}
128 | 
129 | 	@Override
130 | 	public String toString() {
131 | 		return "Todo [name=" + name + "]";
132 | 	}
133 | }
134 | ```
135 | src\main\java\in28minutes\todo\TodoService.java
136 | ```
137 | package in28minutes.todo;
138 | 
139 | import java.util.ArrayList;
140 | import java.util.List;
141 | 
142 | public class TodoService {
143 | 	private static List<Todo> todos = new ArrayList<Todo>();
144 | 
145 | 	static {
146 | 		todos.add(new Todo("Learn Web Application"));
147 | 		todos.add(new Todo("Learn Spring"));
148 | 		todos.add(new Todo("Learn Spring MVC"));
149 | 	}
150 | 
151 | 	public List<Todo> retrieveTodos() {
152 | 		return todos;
153 | 	}
154 | 
155 | 	public void addTodo(String todo) {
156 | 		todos.add(new Todo(todo));
157 | 	}
158 | }
159 | ```
160 | src\main\java\in28minutes\todo\TodoServlet.java
161 | ```
162 | package in28minutes.todo;
163 | 
164 | import java.io.IOException;
165 | 
166 | import javax.servlet.ServletException;
167 | import javax.servlet.annotation.WebServlet;
168 | import javax.servlet.http.HttpServlet;
169 | import javax.servlet.http.HttpServletRequest;
170 | import javax.servlet.http.HttpServletResponse;
171 | 
172 | @WebServlet(urlPatterns = "/todo.do")
173 | public class TodoServlet extends HttpServlet {
174 | 
175 | 	private static final long serialVersionUID = 1L;
176 | 	private TodoService todoService = new TodoService();
177 | 
178 | 	@Override
179 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
180 | 			throws IOException, ServletException {
181 | 		request.setAttribute("todos", todoService.retrieveTodos());
182 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
183 | 	}
184 | 
185 | 	@Override
186 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
187 | 			throws IOException, ServletException {
188 | 		String todo = request.getParameter("todo");
189 | 		if ("".equals(todo)) {
190 | 			request.setAttribute("errorMessage", "Enter a valid todo");
191 | 		} else {
192 | 			todoService.addTodo(todo);
193 | 		}
194 | 		request.setAttribute("todos", todoService.retrieveTodos());
195 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
196 | 	}
197 | 
198 | }
199 | ```
200 | src\main\webapp\WEB-INF\views\login.jsp
201 | ```
202 | <html>
203 | <head>
204 | <title>Yahoo!!</title>
205 | </head>
206 | <body>
207 | 	<p><font color="red">${errorMessage}</font></p>
208 | 	<form action="/login.do" method="POST">
209 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
210 | 	</form>
211 | </body>
212 | </html>
213 | ```
214 | src\main\webapp\WEB-INF\views\todo.jsp
215 | ```
216 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
217 | <html>
218 | <head>
219 | <title>Yahoo!!</title>
220 | </head>
221 | <body>
222 | <H1>Welcome ${name}</H2>
223 | <div>
224 | Your Todos are
225 | <ol>
226 | <c:forEach items="${todos}" var="todo">
227 |    <li>${todo.name}</li>
228 | </c:forEach>
229 | </ol>
230 | 
231 | <p><font color="red">${errorMessage}</font></p>
232 | <form method="POST" action="/todo.do">
233 | New Todo : <input name="todo" type="text" /> <input name="add" type="submit" />
234 | </form>
235 | 
236 | </div>
237 | </body>
238 | </html>
239 | ```
240 | src\main\webapp\WEB-INF\web.xml
241 | ```
242 | <!-- webapp/WEB-INF/web.xml -->
243 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
244 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
245 | 	version="3.0">
246 | 
247 | 	<display-name>To do List</display-name>
248 | 
249 | 	<welcome-file-list>
250 | 		<welcome-file>login.do</welcome-file>
251 | 	</welcome-file-list>
252 | </web-app>
253 | ```
254 | 


--------------------------------------------------------------------------------
/Step14.md:
--------------------------------------------------------------------------------
  1 | pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 |         <dependency>
 19 |             <groupId>javax.servlet</groupId>
 20 |             <artifactId>jstl</artifactId>
 21 |             <version>1.2</version>
 22 |         </dependency>
 23 | 		
 24 | 	</dependencies>
 25 | 
 26 | 	<build>
 27 | 		<pluginManagement>
 28 | 			<plugins>
 29 | 				<plugin>
 30 | 					<groupId>org.apache.maven.plugins</groupId>
 31 | 					<artifactId>maven-compiler-plugin</artifactId>
 32 | 					<version>3.2</version>
 33 | 					<configuration>
 34 | 						<verbose>true</verbose>
 35 | 						<source>1.7</source>
 36 | 						<target>1.7</target>
 37 | 						<showWarnings>true</showWarnings>
 38 | 					</configuration>
 39 | 				</plugin>
 40 | 				<plugin>
 41 | 					<groupId>org.apache.tomcat.maven</groupId>
 42 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 43 | 					<version>2.2</version>
 44 | 					<configuration>
 45 | 						<path>/</path>
 46 | 						<contextReloadable>true</contextReloadable>
 47 | 					</configuration>
 48 | 				</plugin>
 49 | 			</plugins>
 50 | 		</pluginManagement>
 51 | 	</build>
 52 | </project>
 53 | ```
 54 | src\main\java\in28minutes\login\LoginService.java
 55 | ```
 56 | package in28minutes.login;
 57 | 
 58 | public class LoginService {
 59 | 	public boolean validateUser(String user, String password) {
 60 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
 61 | 	}
 62 | 
 63 | }
 64 | ```
 65 | src\main\java\in28minutes\login\LoginServlet.java
 66 | ```
 67 | package in28minutes.login;
 68 | 
 69 | import java.io.IOException;
 70 | 
 71 | import javax.servlet.ServletException;
 72 | import javax.servlet.annotation.WebServlet;
 73 | import javax.servlet.http.HttpServlet;
 74 | import javax.servlet.http.HttpServletRequest;
 75 | import javax.servlet.http.HttpServletResponse;
 76 | 
 77 | 
 78 | @WebServlet(urlPatterns = "/login.do")
 79 | public class LoginServlet extends HttpServlet {
 80 | 
 81 | 	private static final long serialVersionUID = 1L;
 82 | 	private LoginService service = new LoginService();
 83 | 
 84 | 	@Override
 85 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 86 | 			throws IOException, ServletException {
 87 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
 88 | 	}
 89 | 
 90 | 	@Override
 91 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
 92 | 			throws IOException, ServletException {
 93 | 		String name = request.getParameter("name");
 94 | 		String password = request.getParameter("password");
 95 | 
 96 | 		boolean isValidUser = service.validateUser(name, password);
 97 | 
 98 | 		if (isValidUser) {
 99 | 			request.getSession().setAttribute("name", name);
100 | 			response.sendRedirect("/todo.do");
101 | 		} else {
102 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
103 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
104 | 		}
105 | 	}
106 | 
107 | }
108 | ```
109 | src\main\java\in28minutes\todo\DeleteTodoServlet.java
110 | ```
111 | package in28minutes.todo;
112 | 
113 | import java.io.IOException;
114 | 
115 | import javax.servlet.ServletException;
116 | import javax.servlet.annotation.WebServlet;
117 | import javax.servlet.http.HttpServlet;
118 | import javax.servlet.http.HttpServletRequest;
119 | import javax.servlet.http.HttpServletResponse;
120 | 
121 | @WebServlet(urlPatterns = "/delete-todo.do")
122 | public class DeleteTodoServlet extends HttpServlet {
123 | 
124 | 	private static final long serialVersionUID = 1L;
125 | 	private TodoService todoService = new TodoService();
126 | 
127 | 	@Override
128 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
129 | 			throws IOException, ServletException {
130 | 		todoService.deleteTodo(request.getParameter("todo"));
131 | 		response.sendRedirect("/todo.do");
132 | 	}
133 | }
134 | ```
135 | src\main\java\in28minutes\todo\ListTodoServlet.java
136 | ```
137 | package in28minutes.todo;
138 | 
139 | import java.io.IOException;
140 | 
141 | import javax.servlet.ServletException;
142 | import javax.servlet.annotation.WebServlet;
143 | import javax.servlet.http.HttpServlet;
144 | import javax.servlet.http.HttpServletRequest;
145 | import javax.servlet.http.HttpServletResponse;
146 | 
147 | @WebServlet(urlPatterns = "/todo.do")
148 | public class ListTodoServlet extends HttpServlet {
149 | 
150 | 	private static final long serialVersionUID = 1L;
151 | 	private TodoService todoService = new TodoService();
152 | 
153 | 	@Override
154 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
155 | 			throws IOException, ServletException {
156 | 		request.setAttribute("todos", todoService.retrieveTodos());
157 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
158 | 	}
159 | 
160 | 	@Override
161 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
162 | 			throws IOException, ServletException {
163 | 		String todo = request.getParameter("todo");
164 | 		if ("".equals(todo)) {
165 | 			request.setAttribute("errorMessage", "Enter a valid Todo");
166 | 		} else {
167 | 			todoService.addTodo(todo);
168 | 		}
169 | 		request.setAttribute("todos", todoService.retrieveTodos());
170 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
171 | 	}
172 | 
173 | }
174 | ```
175 | src\main\java\in28minutes\todo\Todo.java
176 | ```
177 | package in28minutes.todo;
178 | 
179 | public class Todo {
180 | 
181 | 	public Todo(String name) {
182 | 		super();
183 | 		this.name = name;
184 | 	}
185 | 
186 | 	private String name;
187 | 
188 | 	public String getName() {
189 | 		return name;
190 | 	}
191 | 
192 | 	public void setName(String name) {
193 | 		this.name = name;
194 | 	}
195 | 
196 | 	@Override
197 | 	public String toString() {
198 | 		return "Todo [name=" + name + "]";
199 | 	}
200 | 
201 | 	@Override
202 | 	public int hashCode() {
203 | 		final int prime = 31;
204 | 		int result = 1;
205 | 		result = prime * result + ((name == null) ? 0 : name.hashCode());
206 | 		return result;
207 | 	}
208 | 
209 | 	@Override
210 | 	public boolean equals(Object obj) {
211 | 		if (this == obj)
212 | 			return true;
213 | 		if (obj == null)
214 | 			return false;
215 | 		if (getClass() != obj.getClass())
216 | 			return false;
217 | 		Todo other = (Todo) obj;
218 | 		if (name == null) {
219 | 			if (other.name != null)
220 | 				return false;
221 | 		} else if (!name.equals(other.name))
222 | 			return false;
223 | 		return true;
224 | 	}
225 | 
226 | }
227 | ```
228 | src\main\java\in28minutes\todo\TodoService.java
229 | ```
230 | package in28minutes.todo;
231 | 
232 | import java.util.ArrayList;
233 | import java.util.List;
234 | 
235 | public class TodoService {
236 | 	private static List<Todo> todos = new ArrayList<Todo>();
237 | 
238 | 	static {
239 | 		todos.add(new Todo("Learn Web Application"));
240 | 		todos.add(new Todo("Learn Spring"));
241 | 		todos.add(new Todo("Learn Spring MVC"));
242 | 	}
243 | 
244 | 	public List<Todo> retrieveTodos() {
245 | 		return todos;
246 | 	}
247 | 
248 | 	public void addTodo(String todo) {
249 | 		todos.add(new Todo(todo));
250 | 	}
251 | 
252 | 	public void deleteTodo(String todo) {
253 | 		todos.remove(new Todo(todo));
254 | 	}
255 | }
256 | ```
257 | src\main\webapp\WEB-INF\views\login.jsp
258 | ```
259 | <html>
260 | <head>
261 | <title>Yahoo!!</title>
262 | </head>
263 | <body>
264 | 	<p><font color="red">${errorMessage}</font></p>
265 | 	<form action="/login.do" method="POST">
266 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
267 | 	</form>
268 | </body>
269 | </html>
270 | ```
271 | src\main\webapp\WEB-INF\views\todo.jsp
272 | ```
273 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
274 | <html>
275 | <head>
276 | <title>Yahoo!!</title>
277 | </head>
278 | <body>
279 | <H1>Welcome ${name}</H2>
280 | <div>
281 | Your Todos are
282 | <ol>
283 | <c:forEach items="${todos}" var="todo">
284 |    <li>${todo.name} <a href="/deletetodo.do?todo=${todo.name}">Delete</a></li> 
285 | </c:forEach>
286 | </ol>
287 | 
288 | <p><font color="red">${errorMessage}</font></p>
289 | <form method="POST" action="/todo.do">
290 | New Todo : <input name="todo" type="text" /> <input name="add" type="submit" />
291 | </form>
292 | </div>
293 | </body>
294 | </html>
295 | ```
296 | src\main\webapp\WEB-INF\web.xml
297 | ```
298 | <!-- webapp/WEB-INF/web.xml -->
299 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
300 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
301 | 	version="3.0">
302 | 
303 | 	<display-name>To do List</display-name>
304 | 
305 | 	<welcome-file-list>
306 | 		<welcome-file>login.do</welcome-file>
307 | 	</welcome-file-list>
308 | </web-app>
309 | ```
310 | 


--------------------------------------------------------------------------------
/Step15.md:
--------------------------------------------------------------------------------
  1 | pom.xml
  2 | ```
  3 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5 | 	<modelVersion>4.0.0</modelVersion>
  6 | 	<groupId>com.in28minutes</groupId>
  7 | 	<artifactId>in28Minutes-first-webapp</artifactId>
  8 | 	<version>0.0.1-SNAPSHOT</version>
  9 | 	<packaging>war</packaging>
 10 | 
 11 | 	<dependencies>
 12 | 		<dependency>
 13 | 			<groupId>javax</groupId>
 14 | 			<artifactId>javaee-web-api</artifactId>
 15 | 			<version>6.0</version>
 16 | 			<scope>provided</scope>
 17 | 		</dependency>
 18 | 		<dependency>
 19 | 			<groupId>javax.servlet</groupId>
 20 | 			<artifactId>jstl</artifactId>
 21 | 			<version>1.2</version>
 22 | 		</dependency>
 23 | 
 24 | 
 25 | 		<dependency>
 26 | 			<groupId>org.webjars</groupId>
 27 | 			<artifactId>bootstrap</artifactId>
 28 | 			<version>3.3.6</version>
 29 | 		</dependency>
 30 | 		<dependency>
 31 | 			<groupId>org.webjars</groupId>
 32 | 			<artifactId>jquery</artifactId>
 33 | 			<version>1.9.1</version>
 34 | 		</dependency>
 35 | 
 36 | 	</dependencies>
 37 | 
 38 | 	<build>
 39 | 		<pluginManagement>
 40 | 			<plugins>
 41 | 				<plugin>
 42 | 					<groupId>org.apache.maven.plugins</groupId>
 43 | 					<artifactId>maven-compiler-plugin</artifactId>
 44 | 					<version>3.2</version>
 45 | 					<configuration>
 46 | 						<verbose>true</verbose>
 47 | 						<source>1.7</source>
 48 | 						<target>1.7</target>
 49 | 						<showWarnings>true</showWarnings>
 50 | 					</configuration>
 51 | 				</plugin>
 52 | 				<plugin>
 53 | 					<groupId>org.apache.tomcat.maven</groupId>
 54 | 					<artifactId>tomcat7-maven-plugin</artifactId>
 55 | 					<version>2.2</version>
 56 | 					<configuration>
 57 | 						<path>/</path>
 58 | 						<contextReloadable>true</contextReloadable>
 59 | 					</configuration>
 60 | 				</plugin>
 61 | 			</plugins>
 62 | 		</pluginManagement>
 63 | 	</build>
 64 | </project>
 65 | ```
 66 | src\main\java\in28minutes\login\LoginService.java
 67 | ```
 68 | package in28minutes.login;
 69 | 
 70 | public class LoginService {
 71 | 	public boolean validateUser(String user, String password) {
 72 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
 73 | 	}
 74 | 
 75 | }
 76 | ```
 77 | src\main\java\in28minutes\login\LoginServlet.java
 78 | ```
 79 | package in28minutes.login;
 80 | 
 81 | import java.io.IOException;
 82 | 
 83 | import javax.servlet.ServletException;
 84 | import javax.servlet.annotation.WebServlet;
 85 | import javax.servlet.http.HttpServlet;
 86 | import javax.servlet.http.HttpServletRequest;
 87 | import javax.servlet.http.HttpServletResponse;
 88 | 
 89 | 
 90 | @WebServlet(urlPatterns = "/login.do")
 91 | public class LoginServlet extends HttpServlet {
 92 | 
 93 | 	private static final long serialVersionUID = 1L;
 94 | 	private LoginService service = new LoginService();
 95 | 
 96 | 	@Override
 97 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
 98 | 			throws IOException, ServletException {
 99 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
100 | 	}
101 | 
102 | 	@Override
103 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
104 | 			throws IOException, ServletException {
105 | 		String name = request.getParameter("name");
106 | 		String password = request.getParameter("password");
107 | 
108 | 		boolean isValidUser = service.validateUser(name, password);
109 | 
110 | 		if (isValidUser) {
111 | 			request.getSession().setAttribute("name", name);
112 | 			response.sendRedirect("/todo.do");
113 | 		} else {
114 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
115 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
116 | 		}
117 | 	}
118 | 
119 | }
120 | ```
121 | src\main\java\in28minutes\todo\DeleteTodoServlet.java
122 | ```
123 | package in28minutes.todo;
124 | 
125 | import java.io.IOException;
126 | 
127 | import javax.servlet.ServletException;
128 | import javax.servlet.annotation.WebServlet;
129 | import javax.servlet.http.HttpServlet;
130 | import javax.servlet.http.HttpServletRequest;
131 | import javax.servlet.http.HttpServletResponse;
132 | 
133 | @WebServlet(urlPatterns = "/delete-todo.do")
134 | public class DeleteTodoServlet extends HttpServlet {
135 | 
136 | 	private static final long serialVersionUID = 1L;
137 | 	private TodoService todoService = new TodoService();
138 | 
139 | 	@Override
140 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
141 | 			throws IOException, ServletException {
142 | 		todoService.deleteTodo(request.getParameter("todo"));
143 | 		response.sendRedirect("/todo.do");
144 | 	}
145 | }
146 | ```
147 | src\main\java\in28minutes\todo\ListTodoServlet.java
148 | ```
149 | package in28minutes.todo;
150 | 
151 | import java.io.IOException;
152 | 
153 | import javax.servlet.ServletException;
154 | import javax.servlet.annotation.WebServlet;
155 | import javax.servlet.http.HttpServlet;
156 | import javax.servlet.http.HttpServletRequest;
157 | import javax.servlet.http.HttpServletResponse;
158 | 
159 | @WebServlet(urlPatterns = "/todo.do")
160 | public class ListTodoServlet extends HttpServlet {
161 | 
162 | 	private static final long serialVersionUID = 1L;
163 | 	private TodoService todoService = new TodoService();
164 | 
165 | 	@Override
166 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
167 | 			throws IOException, ServletException {
168 | 		request.setAttribute("todos", todoService.retrieveTodos());
169 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
170 | 	}
171 | 
172 | 	@Override
173 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
174 | 			throws IOException, ServletException {
175 | 		String todo = request.getParameter("todo");
176 | 		if ("".equals(todo)) {
177 | 			request.setAttribute("errorMessage", "Enter a valid Todo");
178 | 		} else {
179 | 			todoService.addTodo(todo);
180 | 		}
181 | 		request.setAttribute("todos", todoService.retrieveTodos());
182 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
183 | 	}
184 | 
185 | }
186 | ```
187 | src\main\java\in28minutes\todo\Todo.java
188 | ```
189 | package in28minutes.todo;
190 | 
191 | public class Todo {
192 | 
193 | 	public Todo(String name) {
194 | 		super();
195 | 		this.name = name;
196 | 	}
197 | 
198 | 	private String name;
199 | 
200 | 	public String getName() {
201 | 		return name;
202 | 	}
203 | 
204 | 	public void setName(String name) {
205 | 		this.name = name;
206 | 	}
207 | 
208 | 	@Override
209 | 	public String toString() {
210 | 		return "Todo [name=" + name + "]";
211 | 	}
212 | 
213 | 	@Override
214 | 	public int hashCode() {
215 | 		final int prime = 31;
216 | 		int result = 1;
217 | 		result = prime * result + ((name == null) ? 0 : name.hashCode());
218 | 		return result;
219 | 	}
220 | 
221 | 	@Override
222 | 	public boolean equals(Object obj) {
223 | 		if (this == obj)
224 | 			return true;
225 | 		if (obj == null)
226 | 			return false;
227 | 		if (getClass() != obj.getClass())
228 | 			return false;
229 | 		Todo other = (Todo) obj;
230 | 		if (name == null) {
231 | 			if (other.name != null)
232 | 				return false;
233 | 		} else if (!name.equals(other.name))
234 | 			return false;
235 | 		return true;
236 | 	}
237 | 
238 | }
239 | ```
240 | src\main\java\in28minutes\todo\TodoService.java
241 | ```
242 | package in28minutes.todo;
243 | 
244 | import java.util.ArrayList;
245 | import java.util.List;
246 | 
247 | public class TodoService {
248 | 	private static List<Todo> todos = new ArrayList<Todo>();
249 | 
250 | 	static {
251 | 		todos.add(new Todo("Learn Web Application"));
252 | 		todos.add(new Todo("Learn Spring"));
253 | 		todos.add(new Todo("Learn Spring MVC"));
254 | 	}
255 | 
256 | 	public List<Todo> retrieveTodos() {
257 | 		return todos;
258 | 	}
259 | 
260 | 	public void addTodo(String todo) {
261 | 		todos.add(new Todo(todo));
262 | 	}
263 | 
264 | 	public void deleteTodo(String todo) {
265 | 		todos.remove(new Todo(todo));
266 | 	}
267 | }
268 | ```
269 | src\main\webapp\WEB-INF\views\login.jsp
270 | ```
271 | <html>
272 | <head>
273 | <title>Yahoo!!</title>
274 | </head>
275 | <body>
276 | 	<p><font color="red">${errorMessage}</font></p>
277 | 	<form action="/login.do" method="POST">
278 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
279 | 	</form>
280 | </body>
281 | </html>
282 | ```
283 | src\main\webapp\WEB-INF\views\todo.jsp
284 | ```
285 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
286 | <!DOCTYPE html>
287 | <html>
288 | <head>
289 | <title>Yahoo!!</title>
290 | <!-- Bootstrap core CSS -->
291 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
292 | 	rel="stylesheet">
293 | </head>
294 | <body>
295 | 	<H1>Welcome ${name}</H1>
296 | 	<div>
297 | 		Your Todos are
298 | 		<ol>
299 | 			<c:forEach items="${todos}" var="todo">
300 | 				<li>${todo.name} <a href="/deletetodo.do?todo=${todo.name}">Delete</a></li>
301 | 			</c:forEach>
302 | 		</ol>
303 | 
304 | 		<p>
305 | 			<font color="red">${errorMessage}</font>
306 | 		</p>
307 | 		<form method="POST" action="/todo.do">
308 | 			New Todo : <input name="todo" type="text" /> <input name="add"
309 | 				type="submit" />
310 | 		</form>
311 | 	</div>
312 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
313 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
314 | </body>
315 | </html>
316 | ```
317 | src\main\webapp\WEB-INF\web.xml
318 | ```
319 | <!-- webapp/WEB-INF/web.xml -->
320 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
321 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
322 | 	version="3.0">
323 | 
324 | 	<display-name>To do List</display-name>
325 | 
326 | 	<welcome-file-list>
327 | 		<welcome-file>login.do</welcome-file>
328 | 	</welcome-file-list>
329 | </web-app>
330 | ```
331 | 


--------------------------------------------------------------------------------
/Step17.md:
--------------------------------------------------------------------------------
  1 | Bootstrap Sample Page
  2 | ```
  3 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
  4 | <!DOCTYPE html>
  5 | <html>
  6 | <head>
  7 | <title>Todos</title>
  8 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
  9 | 	rel="stylesheet">
 10 | 
 11 | <style>
 12 | 	.footer {
 13 | 		position: absolute;
 14 | 		bottom: 0;
 15 | 		width: 100%;
 16 | 		height: 60px;
 17 | 		background-color: #f5f5f5;
 18 | 	}
 19 | </style>
 20 | </head>
 21 | 
 22 | <body>
 23 | 
 24 | 	<nav class="navbar navbar-default">
 25 | 
 26 | 		<a href="/" class="navbar-brand">Brand</a>
 27 | 
 28 | 		<ul class="nav navbar-nav">
 29 | 			<li class="active"><a href="#">Home</a></li>
 30 | 			<li><a href="/todo.do">Todos</a></li>
 31 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
 32 | 		</ul>
 33 | 
 34 | 		<ul class="nav navbar-nav navbar-right">
 35 | 			<li><a href="/login.do">Login</a></li>
 36 | 		</ul>
 37 | 
 38 | 	</nav>
 39 | 
 40 | 	<div class="container">
 41 | 		<H1>Heading</H1>
 42 | 		Body of the Page
 43 | 	</div>
 44 | 
 45 | 	<footer class="footer">
 46 | 		<p>footer content</p>
 47 | 	</footer>
 48 | 
 49 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
 50 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
 51 | 
 52 | </body>
 53 | 
 54 | </html>
 55 | ```
 56 | 
 57 | pom.xml
 58 | ```
 59 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 60 | 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 61 | 	<modelVersion>4.0.0</modelVersion>
 62 | 	<groupId>com.in28minutes</groupId>
 63 | 	<artifactId>in28Minutes-first-webapp</artifactId>
 64 | 	<version>0.0.1-SNAPSHOT</version>
 65 | 	<packaging>war</packaging>
 66 | 
 67 | 	<dependencies>
 68 | 		<dependency>
 69 | 			<groupId>javax</groupId>
 70 | 			<artifactId>javaee-web-api</artifactId>
 71 | 			<version>6.0</version>
 72 | 			<scope>provided</scope>
 73 | 		</dependency>
 74 | 		<dependency>
 75 | 			<groupId>javax.servlet</groupId>
 76 | 			<artifactId>jstl</artifactId>
 77 | 			<version>1.2</version>
 78 | 		</dependency>
 79 | 
 80 | 
 81 | 		<dependency>
 82 | 			<groupId>org.webjars</groupId>
 83 | 			<artifactId>bootstrap</artifactId>
 84 | 			<version>3.3.6</version>
 85 | 		</dependency>
 86 | 		<dependency>
 87 | 			<groupId>org.webjars</groupId>
 88 | 			<artifactId>jquery</artifactId>
 89 | 			<version>1.9.1</version>
 90 | 		</dependency>
 91 | 
 92 | 	</dependencies>
 93 | 
 94 | 	<build>
 95 | 		<pluginManagement>
 96 | 			<plugins>
 97 | 				<plugin>
 98 | 					<groupId>org.apache.maven.plugins</groupId>
 99 | 					<artifactId>maven-compiler-plugin</artifactId>
100 | 					<version>3.2</version>
101 | 					<configuration>
102 | 						<verbose>true</verbose>
103 | 						<source>1.7</source>
104 | 						<target>1.7</target>
105 | 						<showWarnings>true</showWarnings>
106 | 					</configuration>
107 | 				</plugin>
108 | 				<plugin>
109 | 					<groupId>org.apache.tomcat.maven</groupId>
110 | 					<artifactId>tomcat7-maven-plugin</artifactId>
111 | 					<version>2.2</version>
112 | 					<configuration>
113 | 						<path>/</path>
114 | 						<contextReloadable>true</contextReloadable>
115 | 					</configuration>
116 | 				</plugin>
117 | 			</plugins>
118 | 		</pluginManagement>
119 | 	</build>
120 | </project>
121 | ```
122 | src\main\java\in28minutes\login\LoginService.java
123 | ```
124 | package in28minutes.login;
125 | 
126 | public class LoginService {
127 | 	public boolean validateUser(String user, String password) {
128 | 		return user.equalsIgnoreCase("in28Minutes") && password.equals("dummy");
129 | 	}
130 | 
131 | }
132 | ```
133 | src\main\java\in28minutes\login\LoginServlet.java
134 | ```
135 | package in28minutes.login;
136 | 
137 | import java.io.IOException;
138 | 
139 | import javax.servlet.ServletException;
140 | import javax.servlet.annotation.WebServlet;
141 | import javax.servlet.http.HttpServlet;
142 | import javax.servlet.http.HttpServletRequest;
143 | import javax.servlet.http.HttpServletResponse;
144 | 
145 | 
146 | @WebServlet(urlPatterns = "/login.do")
147 | public class LoginServlet extends HttpServlet {
148 | 
149 | 	private static final long serialVersionUID = 1L;
150 | 	private LoginService service = new LoginService();
151 | 
152 | 	@Override
153 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
154 | 			throws IOException, ServletException {
155 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
156 | 	}
157 | 
158 | 	@Override
159 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
160 | 			throws IOException, ServletException {
161 | 		String name = request.getParameter("name");
162 | 		String password = request.getParameter("password");
163 | 
164 | 		boolean isValidUser = service.validateUser(name, password);
165 | 
166 | 		if (isValidUser) {
167 | 			request.getSession().setAttribute("name", name);
168 | 			response.sendRedirect("/todo.do");
169 | 		} else {
170 | 			request.setAttribute("errorMessage", "Invalid Credentials!!");
171 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
172 | 		}
173 | 	}
174 | 
175 | }
176 | ```
177 | src\main\java\in28minutes\todo\DeleteTodoServlet.java
178 | ```
179 | package in28minutes.todo;
180 | 
181 | import java.io.IOException;
182 | 
183 | import javax.servlet.ServletException;
184 | import javax.servlet.annotation.WebServlet;
185 | import javax.servlet.http.HttpServlet;
186 | import javax.servlet.http.HttpServletRequest;
187 | import javax.servlet.http.HttpServletResponse;
188 | 
189 | @WebServlet(urlPatterns = "/delete-todo.do")
190 | public class DeleteTodoServlet extends HttpServlet {
191 | 
192 | 	private static final long serialVersionUID = 1L;
193 | 	private TodoService todoService = new TodoService();
194 | 
195 | 	@Override
196 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
197 | 			throws IOException, ServletException {
198 | 		todoService.deleteTodo(request.getParameter("todo"));
199 | 		response.sendRedirect("/todo.do");
200 | 	}
201 | }
202 | ```
203 | src\main\java\in28minutes\todo\ListTodoServlet.java
204 | ```
205 | package in28minutes.todo;
206 | 
207 | import java.io.IOException;
208 | 
209 | import javax.servlet.ServletException;
210 | import javax.servlet.annotation.WebServlet;
211 | import javax.servlet.http.HttpServlet;
212 | import javax.servlet.http.HttpServletRequest;
213 | import javax.servlet.http.HttpServletResponse;
214 | 
215 | @WebServlet(urlPatterns = "/todo.do")
216 | public class ListTodoServlet extends HttpServlet {
217 | 
218 | 	private static final long serialVersionUID = 1L;
219 | 	private TodoService todoService = new TodoService();
220 | 
221 | 	@Override
222 | 	protected void doGet(HttpServletRequest request, HttpServletResponse response)
223 | 			throws IOException, ServletException {
224 | 		request.setAttribute("todos", todoService.retrieveTodos());
225 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
226 | 	}
227 | 
228 | 	@Override
229 | 	protected void doPost(HttpServletRequest request, HttpServletResponse response)
230 | 			throws IOException, ServletException {
231 | 		String todo = request.getParameter("todo");
232 | 		if ("".equals(todo)) {
233 | 			request.setAttribute("errorMessage", "Enter a valid Todo");
234 | 		} else {
235 | 			todoService.addTodo(todo);
236 | 		}
237 | 		request.setAttribute("todos", todoService.retrieveTodos());
238 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(request, response);
239 | 	}
240 | 
241 | }
242 | ```
243 | src\main\java\in28minutes\todo\Todo.java
244 | ```
245 | package in28minutes.todo;
246 | 
247 | public class Todo {
248 | 
249 | 	public Todo(String name) {
250 | 		super();
251 | 		this.name = name;
252 | 	}
253 | 
254 | 	private String name;
255 | 
256 | 	public String getName() {
257 | 		return name;
258 | 	}
259 | 
260 | 	public void setName(String name) {
261 | 		this.name = name;
262 | 	}
263 | 
264 | 	@Override
265 | 	public String toString() {
266 | 		return "Todo [name=" + name + "]";
267 | 	}
268 | 
269 | 	@Override
270 | 	public int hashCode() {
271 | 		final int prime = 31;
272 | 		int result = 1;
273 | 		result = prime * result + ((name == null) ? 0 : name.hashCode());
274 | 		return result;
275 | 	}
276 | 
277 | 	@Override
278 | 	public boolean equals(Object obj) {
279 | 		if (this == obj)
280 | 			return true;
281 | 		if (obj == null)
282 | 			return false;
283 | 		if (getClass() != obj.getClass())
284 | 			return false;
285 | 		Todo other = (Todo) obj;
286 | 		if (name == null) {
287 | 			if (other.name != null)
288 | 				return false;
289 | 		} else if (!name.equals(other.name))
290 | 			return false;
291 | 		return true;
292 | 	}
293 | 
294 | }
295 | ```
296 | src\main\java\in28minutes\todo\TodoService.java
297 | ```
298 | package in28minutes.todo;
299 | 
300 | import java.util.ArrayList;
301 | import java.util.List;
302 | 
303 | public class TodoService {
304 | 	private static List<Todo> todos = new ArrayList<Todo>();
305 | 
306 | 	static {
307 | 		todos.add(new Todo("Learn Web Application"));
308 | 		todos.add(new Todo("Learn Spring"));
309 | 		todos.add(new Todo("Learn Spring MVC"));
310 | 	}
311 | 
312 | 	public List<Todo> retrieveTodos() {
313 | 		return todos;
314 | 	}
315 | 
316 | 	public void addTodo(String todo) {
317 | 		todos.add(new Todo(todo));
318 | 	}
319 | 
320 | 	public void deleteTodo(String todo) {
321 | 		todos.remove(new Todo(todo));
322 | 	}
323 | }
324 | ```
325 | src\main\webapp\WEB-INF\views\login.jsp
326 | ```
327 | <html>
328 | <head>
329 | <title>Yahoo!!</title>
330 | </head>
331 | <body>
332 | 	<p><font color="red">${errorMessage}</font></p>
333 | 	<form action="/login.do" method="POST">
334 | 		Name : <input name="name" type="text" /> Password : <input name="password" type="password" /> <input type="submit" />
335 | 	</form>
336 | </body>
337 | </html>
338 | ```
339 | src\main\webapp\WEB-INF\views\todo.jsp
340 | ```
341 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
342 | 
343 | <!DOCTYPE html>
344 | <html>
345 | 
346 | <head>
347 | <title>Yahoo!!</title>
348 | <!-- Bootstrap core CSS -->
349 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
350 | 	rel="stylesheet">
351 | 
352 | <style>
353 | .footer {
354 | 	position: absolute;
355 | 	bottom: 0;
356 | 	width: 100%;
357 | 	height: 60px;
358 | 	background-color: #f5f5f5;
359 | }
360 | 
361 | .footer .container {
362 | width: auto;
363 | max-width: 680px;
364 | padding: 0 15px;
365 | }
366 | </style>
367 | </head>
368 | 
369 | <body>
370 | 
371 | 	<nav role="navigation" class="navbar navbar-default">
372 | 
373 | 		<div class="">
374 | 			<a href="/" class="navbar-brand">Brand</a>
375 | 		</div>
376 | 
377 | 		<div class="navbar-collapse">
378 | 			<ul class="nav navbar-nav">
379 | 				<li class="active"><a href="#">Home</a></li>
380 | 				<li><a href="/todo.do">Todos</a></li>
381 | 				<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
382 | 			</ul>
383 | 			<ul class="nav navbar-nav navbar-right">
384 | 				<li><a href="/login.do">Login</a></li>
385 | 			</ul>
386 | 		</div>
387 | 
388 | 	</nav>
389 | 
390 | 	<div class="container">
391 | 		<H1>Welcome ${name}</H1>
392 | 
393 | 		Your Todos are
394 | 		<ol>
395 | 			<c:forEach items="${todos}" var="todo">
396 | 				<li>${todo.name}&nbsp;<a
397 | 					href="/deletetodo.do?todo=${todo.name}">Delete</a></li>
398 | 			</c:forEach>
399 | 		</ol>
400 | 
401 | 		<p>
402 | 			<font color="red">${errorMessage}</font>
403 | 		</p>
404 | 		<form method="POST" action="/todo.do">
405 | 			New Todo : <input name="todo" type="text" /> <input name="add"
406 | 				type="submit" />
407 | 		</form>
408 | 	</div>
409 | 
410 | 	<footer class="footer">
411 | 		<div class="container">
412 | 			<p>footer content</p>
413 | 		</div>
414 | 	</footer>
415 | 
416 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
417 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
418 | 
419 | </body>
420 | 
421 | </html>
422 | ```
423 | src\main\webapp\WEB-INF\web.xml
424 | ```
425 | <!-- webapp/WEB-INF/web.xml -->
426 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
427 | 	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
428 | 	version="3.0">
429 | 
430 | 	<display-name>To do List</display-name>
431 | 
432 | 	<welcome-file-list>
433 | 		<welcome-file>login.do</welcome-file>
434 | 	</welcome-file-list>
435 | </web-app>
436 | ```
437 | 


--------------------------------------------------------------------------------
/Step20.md:
--------------------------------------------------------------------------------
  1 | ## Files List
  2 | ### pom.xml
  3 | ```
  4 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  5 |     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  6 |     <modelVersion>4.0.0</modelVersion>
  7 |     <groupId>com.in28minutes</groupId>
  8 |     <artifactId>in28Minutes-first-webapp</artifactId>
  9 |     <version>0.0.1-SNAPSHOT</version>
 10 |     <packaging>war</packaging>
 11 | 
 12 |     <dependencies>
 13 |         <dependency>
 14 |             <groupId>javax</groupId>
 15 |             <artifactId>javaee-web-api</artifactId>
 16 |             <version>6.0</version>
 17 |             <scope>provided</scope>
 18 |         </dependency>
 19 |         <dependency>
 20 |             <groupId>javax.servlet</groupId>
 21 |             <artifactId>jstl</artifactId>
 22 |             <version>1.2</version>
 23 |         </dependency>
 24 |  		
 25 |  		<dependency>
 26 |             <groupId>org.webjars</groupId>
 27 |             <artifactId>bootstrap</artifactId>
 28 |             <version>3.3.6</version>
 29 |         </dependency>
 30 |         <dependency>
 31 |             <groupId>org.webjars</groupId>
 32 |             <artifactId>jquery</artifactId>
 33 |             <version>1.9.1</version>
 34 |         </dependency>
 35 |     </dependencies>
 36 | 
 37 |     <build>
 38 |         <pluginManagement>
 39 |             <plugins>
 40 |                 <plugin>
 41 |                     <groupId>org.apache.maven.plugins</groupId>
 42 |                     <artifactId>maven-compiler-plugin</artifactId>
 43 |                     <version>3.2</version>
 44 |                     <configuration>
 45 |                         <verbose>true</verbose>
 46 |                         <source>1.7</source>
 47 |                         <target>1.7</target>
 48 |                         <showWarnings>true</showWarnings>
 49 |                     </configuration>
 50 |                 </plugin>
 51 |                 <plugin>
 52 |                     <groupId>org.apache.tomcat.maven</groupId>
 53 |                     <artifactId>tomcat7-maven-plugin</artifactId>
 54 |                     <version>2.2</version>
 55 |                     <configuration>
 56 |                         <path>/</path>
 57 |                         <contextReloadable>true</contextReloadable>
 58 |                     </configuration>
 59 |                 </plugin>
 60 |             </plugins>
 61 |         </pluginManagement>
 62 |     </build>
 63 | </project>
 64 | ```
 65 | ### src/main/java/com/in28minutes/filter/LoginRequiredFilter.java
 66 | ```
 67 | package com.in28minutes.filter;
 68 | 
 69 | import java.io.IOException;
 70 | 
 71 | import javax.servlet.Filter;
 72 | import javax.servlet.FilterChain;
 73 | import javax.servlet.FilterConfig;
 74 | import javax.servlet.ServletException;
 75 | import javax.servlet.ServletRequest;
 76 | import javax.servlet.ServletResponse;
 77 | import javax.servlet.annotation.WebFilter;
 78 | import javax.servlet.http.HttpServletRequest;
 79 | 
 80 | @WebFilter(urlPatterns = "*.do")
 81 | public class LoginRequiredFilter implements Filter {
 82 | 
 83 | 	@Override
 84 | 	public void destroy() {
 85 | 
 86 | 	}
 87 | 
 88 | 	@Override
 89 | 	public void doFilter(ServletRequest servletRequest,
 90 | 			ServletResponse servletResponse, FilterChain chain)
 91 | 			throws IOException, ServletException {
 92 | 		HttpServletRequest request = (HttpServletRequest) servletRequest;
 93 | 
 94 | 		if (request.getSession().getAttribute("name") != null) {
 95 | 			chain.doFilter(servletRequest, servletResponse);
 96 | 		} else {
 97 | 			request.getRequestDispatcher("/login.do").forward(servletRequest,
 98 | 					servletResponse);
 99 | 		}
100 | 	}
101 | 
102 | 	@Override
103 | 	public void init(FilterConfig arg0) throws ServletException {
104 | 	}
105 | 
106 | }
107 | ```
108 | ### src/main/java/com/in28minutes/login/LoginService.java
109 | ```
110 | package com.in28minutes.login;
111 | 
112 | public class LoginService {
113 | 
114 | 	public boolean isUserValid(String user, String password) {
115 | 		if (user.equals("in28Minutes") && password.equals("dummy"))
116 | 			return true;
117 | 
118 | 		return false;
119 | 	}
120 | 
121 | }
122 | ```
123 | ### src/main/java/com/in28minutes/login/LoginServlet.java
124 | ```
125 | package com.in28minutes.login;
126 | 
127 | import java.io.IOException;
128 | 
129 | import javax.servlet.ServletException;
130 | import javax.servlet.annotation.WebServlet;
131 | import javax.servlet.http.HttpServlet;
132 | import javax.servlet.http.HttpServletRequest;
133 | import javax.servlet.http.HttpServletResponse;
134 | 
135 | import com.in28minutes.todo.TodoService;
136 | 
137 | @WebServlet(urlPatterns = "/login.do")
138 | public class LoginServlet extends HttpServlet {
139 | 
140 | 	private LoginService userValidationService = new LoginService();
141 | 	private TodoService todoService = new TodoService();
142 | 
143 | 	protected void doGet(HttpServletRequest request,
144 | 			HttpServletResponse response) throws ServletException, IOException {
145 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
146 | 				request, response);
147 | 	}
148 | 
149 | 	protected void doPost(HttpServletRequest request,
150 | 			HttpServletResponse response) throws ServletException, IOException {
151 | 		String name = request.getParameter("name");
152 | 		String password = request.getParameter("password");
153 | 
154 | 		boolean isUserValid = userValidationService.isUserValid(name, password);
155 | 
156 | 		if (isUserValid) {
157 | 			request.getSession().setAttribute("name", name);
158 | 			response.sendRedirect("/todo.do");
159 | 		} else {
160 | 			request.setAttribute("errorMessage", "Invalid Credentials!");
161 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
162 | 					request, response);
163 | 		}
164 | 	}
165 | 
166 | }
167 | ```
168 | ### src/main/java/com/in28minutes/logout/LogoutServlet.java
169 | ```
170 | package com.in28minutes.logout;
171 | 
172 | import java.io.IOException;
173 | 
174 | import javax.servlet.ServletException;
175 | import javax.servlet.annotation.WebServlet;
176 | import javax.servlet.http.HttpServlet;
177 | import javax.servlet.http.HttpServletRequest;
178 | import javax.servlet.http.HttpServletResponse;
179 | 
180 | @WebServlet(urlPatterns = "/logout.do")
181 | public class LogoutServlet extends HttpServlet {
182 | 	protected void doGet(HttpServletRequest request,
183 | 			HttpServletResponse response) throws ServletException, IOException {
184 | 		request.getSession().invalidate();
185 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
186 | 				request, response);
187 | 	}
188 | }
189 | ```
190 | ### src/main/java/com/in28minutes/todo/AddTodoServlet.java
191 | ```
192 | package com.in28minutes.todo;
193 | 
194 | import java.io.IOException;
195 | 
196 | import javax.servlet.ServletException;
197 | import javax.servlet.annotation.WebServlet;
198 | import javax.servlet.http.HttpServlet;
199 | import javax.servlet.http.HttpServletRequest;
200 | import javax.servlet.http.HttpServletResponse;
201 | 
202 | @WebServlet(urlPatterns = "/add-todo.do")
203 | public class AddTodoServlet extends HttpServlet {
204 | 
205 | 	private TodoService todoService = new TodoService();
206 | 
207 | 	protected void doPost(HttpServletRequest request,
208 | 			HttpServletResponse response) throws ServletException, IOException {
209 | 		String newTodo = request.getParameter("todo");
210 | 		todoService.addTodo(new Todo(newTodo));
211 | 		response.sendRedirect("/todo.do");
212 | 	}
213 | }
214 | ```
215 | ### src/main/java/com/in28minutes/todo/DeleteTodoServlet.java
216 | ```
217 | package com.in28minutes.todo;
218 | 
219 | import java.io.IOException;
220 | 
221 | import javax.servlet.ServletException;
222 | import javax.servlet.annotation.WebServlet;
223 | import javax.servlet.http.HttpServlet;
224 | import javax.servlet.http.HttpServletRequest;
225 | import javax.servlet.http.HttpServletResponse;
226 | 
227 | @WebServlet(urlPatterns = "/delete-todo.do")
228 | public class DeleteTodoServlet extends HttpServlet {
229 | 
230 | 	private TodoService todoService = new TodoService();
231 | 
232 | 	protected void doGet(HttpServletRequest request,
233 | 			HttpServletResponse response) throws ServletException, IOException {
234 | 		todoService.deleteTodo(new Todo(request.getParameter("todo")));
235 | 		response.sendRedirect("/todo.do");
236 | 	}
237 | }
238 | ```
239 | ### src/main/java/com/in28minutes/todo/ListTodoServlet.java
240 | ```
241 | package com.in28minutes.todo;
242 | 
243 | import java.io.IOException;
244 | 
245 | import javax.servlet.ServletException;
246 | import javax.servlet.annotation.WebServlet;
247 | import javax.servlet.http.HttpServlet;
248 | import javax.servlet.http.HttpServletRequest;
249 | import javax.servlet.http.HttpServletResponse;
250 | 
251 | @WebServlet(urlPatterns = "/todo.do")
252 | public class ListTodoServlet extends HttpServlet {
253 | 
254 | 	private TodoService todoService = new TodoService();
255 | 
256 | 	protected void doGet(HttpServletRequest request,
257 | 			HttpServletResponse response) throws ServletException, IOException {
258 | 		request.setAttribute("todos", todoService.retrieveTodos());
259 | 		request.getRequestDispatcher("/WEB-INF/views/todo.jsp").forward(
260 | 				request, response);
261 | 	}
262 | }
263 | ```
264 | ### src/main/java/com/in28minutes/todo/Todo.java
265 | ```
266 | package com.in28minutes.todo;
267 | 
268 | public class Todo {
269 | 	private String name;
270 | 
271 | 	public Todo(String name) {
272 | 		super();
273 | 		this.name = name;
274 | 	}
275 | 
276 | 	public String getName() {
277 | 		return name;
278 | 	}
279 | 
280 | 	public void setName(String name) {
281 | 		this.name = name;
282 | 	}
283 | 
284 | 	@Override
285 | 	public String toString() {
286 | 		return String.format("Todo [name=%s]", name);
287 | 	}
288 | 
289 | 	@Override
290 | 	public int hashCode() {
291 | 		final int prime = 31;
292 | 		int result = 1;
293 | 		result = prime * result + ((name == null) ? 0 : name.hashCode());
294 | 		return result;
295 | 	}
296 | 
297 | 	@Override
298 | 	public boolean equals(Object obj) {
299 | 		if (this == obj)
300 | 			return true;
301 | 		if (obj == null)
302 | 			return false;
303 | 		if (getClass() != obj.getClass())
304 | 			return false;
305 | 		Todo other = (Todo) obj;
306 | 		if (name == null) {
307 | 			if (other.name != null)
308 | 				return false;
309 | 		} else if (!name.equals(other.name))
310 | 			return false;
311 | 		return true;
312 | 	}
313 | 
314 | }
315 | ```
316 | ### src/main/java/com/in28minutes/todo/TodoService.java
317 | ```
318 | package com.in28minutes.todo;
319 | 
320 | import java.util.ArrayList;
321 | import java.util.List;
322 | 
323 | public class TodoService {
324 | 	private static List<Todo> todos = new ArrayList<Todo>();
325 | 	static {
326 | 		todos.add(new Todo("Learn Web Application Development"));
327 | 		todos.add(new Todo("Learn Spring MVC"));
328 | 		todos.add(new Todo("Learn Spring Rest Services"));
329 | 	}
330 | 
331 | 	public List<Todo> retrieveTodos() {
332 | 		return todos;
333 | 	}
334 | 
335 | 	public void addTodo(Todo todo) {
336 | 		todos.add(todo);
337 | 	}
338 | 
339 | 	public void deleteTodo(Todo todo) {
340 | 		todos.remove(todo);
341 | 	}
342 | 
343 | }
344 | ```
345 | ### src/main/webapp/WEB-INF/views/login.jsp
346 | ```
347 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
348 | <!DOCTYPE html>
349 | <html>
350 | <head>
351 | <title>Todos</title>
352 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
353 | 	rel="stylesheet">
354 | 
355 | <style>
356 | .footer {
357 | 	position: absolute;
358 | 	bottom: 0;
359 | 	width: 100%;
360 | 	height: 60px;
361 | 	background-color: #f5f5f5;
362 | }
363 | </style>
364 | </head>
365 | 
366 | <body>
367 | 
368 | 	<nav class="navbar navbar-default">
369 | 
370 | 		<a href="/" class="navbar-brand">Brand</a>
371 | 
372 | 		<ul class="nav navbar-nav">
373 | 			<li class="active"><a href="#">Home</a></li>
374 | 			<li><a href="/todo.do">Todos</a></li>
375 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
376 | 		</ul>
377 | 
378 | 		<ul class="nav navbar-nav navbar-right">
379 | 			<li><a href="/login.do">Login</a></li>
380 | 		</ul>
381 | 
382 | 	</nav>
383 | 
384 | 	<div class="container">
385 | 		<form action="/login.do" method="post">
386 | 			<p>
387 | 				<font color="red">${errorMessage}</font>
388 | 			</p>
389 | 			Name: <input type="text" name="name" /> Password:<input
390 | 				type="password" name="password" /> <input type="submit"
391 | 				value="Login" />
392 | 		</form>
393 | 
394 | 	</div>
395 | 
396 | 	<footer class="footer">
397 | 		<div>footer content</div>
398 | 	</footer>
399 | 
400 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
401 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
402 | 
403 | </body>
404 | 
405 | </html>
406 | ```
407 | ### src/main/webapp/WEB-INF/views/todo.jsp
408 | ```
409 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
410 | <!DOCTYPE html>
411 | <html>
412 | <head>
413 | <title>Todos</title>
414 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
415 | 	rel="stylesheet">
416 | 
417 | <style>
418 | .footer {
419 | 	position: absolute;
420 | 	bottom: 0;
421 | 	width: 100%;
422 | 	height: 60px;
423 | 	background-color: #f5f5f5;
424 | }
425 | </style>
426 | </head>
427 | 
428 | <body>
429 | 
430 | 	<nav class="navbar navbar-default">
431 | 
432 | 		<a href="/" class="navbar-brand">Brand</a>
433 | 
434 | 		<ul class="nav navbar-nav">
435 | 			<li class="active"><a href="#">Home</a></li>
436 | 			<li><a href="/todo.do">Todos</a></li>
437 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
438 | 		</ul>
439 | 
440 | 		<ul class="nav navbar-nav navbar-right">
441 | 			<li><a href="/logout.do">Logout</a></li>
442 | 		</ul>
443 | 
444 | 	</nav>
445 | 
446 | 	<div class="container">
447 | 		<H1>Welcome ${name}</H1>
448 | 
449 | 		Your Todos are
450 | 		<ol>
451 | 			<c:forEach items="${todos}" var="todo">
452 | 				<li>${todo.name}&nbsp;<a
453 | 					href="/delete-todo.do?todo=${todo.name}">Delete</a></li>
454 | 			</c:forEach>
455 | 		</ol>
456 | 
457 | 		<p>
458 | 			<font color="red">${errorMessage}</font>
459 | 		</p>
460 | 		<form method="POST" action="/add-todo.do">
461 | 			New Todo : <input name="todo" type="text" /> <input name="add"
462 | 				type="submit" />
463 | 		</form>
464 | 	</div>
465 | 
466 | 	<footer class="footer">
467 | 		<div>footer content</div>
468 | 	</footer>
469 | 
470 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
471 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
472 | 
473 | </body>
474 | 
475 | </html>
476 | ```
477 | ### src/main/webapp/WEB-INF/web.xml
478 | ```
479 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
480 |     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
481 |     version="3.0">
482 | 
483 |     <display-name>To do List</display-name>
484 | 
485 |     <welcome-file-list>
486 |         <welcome-file>login.do</welcome-file>
487 |     </welcome-file-list>
488 | 
489 | </web-app>
490 | ```
491 | 


--------------------------------------------------------------------------------
/Step24.md:
--------------------------------------------------------------------------------
  1 | ## Files List
  2 | ### pom.xml
  3 | ```
  4 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  5 |     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  6 |     <modelVersion>4.0.0</modelVersion>
  7 |     <groupId>com.in28minutes</groupId>
  8 |     <artifactId>in28Minutes-first-webapp</artifactId>
  9 |     <version>0.0.1-SNAPSHOT</version>
 10 |     <packaging>war</packaging>
 11 | 
 12 |     <dependencies>
 13 |         <dependency>
 14 |             <groupId>javax</groupId>
 15 |             <artifactId>javaee-web-api</artifactId>
 16 |             <version>6.0</version>
 17 |             <scope>provided</scope>
 18 |         </dependency>
 19 |         <dependency>
 20 |             <groupId>javax.servlet</groupId>
 21 |             <artifactId>jstl</artifactId>
 22 |             <version>1.2</version>
 23 |         </dependency>
 24 |  		
 25 |  		<dependency>
 26 |             <groupId>org.webjars</groupId>
 27 |             <artifactId>bootstrap</artifactId>
 28 |             <version>3.3.6</version>
 29 |         </dependency>
 30 |         <dependency>
 31 |             <groupId>org.webjars</groupId>
 32 |             <artifactId>jquery</artifactId>
 33 |             <version>1.9.1</version>
 34 |         </dependency>
 35 |     </dependencies>
 36 | 
 37 |     <build>
 38 |         <pluginManagement>
 39 |             <plugins>
 40 |                 <plugin>
 41 |                     <groupId>org.apache.maven.plugins</groupId>
 42 |                     <artifactId>maven-compiler-plugin</artifactId>
 43 |                     <version>3.2</version>
 44 |                     <configuration>
 45 |                         <verbose>true</verbose>
 46 |                         <source>1.7</source>
 47 |                         <target>1.7</target>
 48 |                         <showWarnings>true</showWarnings>
 49 |                     </configuration>
 50 |                 </plugin>
 51 |                 <plugin>
 52 |                     <groupId>org.apache.tomcat.maven</groupId>
 53 |                     <artifactId>tomcat7-maven-plugin</artifactId>
 54 |                     <version>2.2</version>
 55 |                     <configuration>
 56 |                         <path>/</path>
 57 |                         <contextReloadable>true</contextReloadable>
 58 |                     </configuration>
 59 |                 </plugin>
 60 |             </plugins>
 61 |         </pluginManagement>
 62 |     </build>
 63 | </project>
 64 | ```
 65 | ### src/main/java/com/in28minutes/filter/LoginRequiredFilter.java
 66 | ```
 67 | package com.in28minutes.filter;
 68 | 
 69 | import java.io.IOException;
 70 | 
 71 | import javax.servlet.Filter;
 72 | import javax.servlet.FilterChain;
 73 | import javax.servlet.FilterConfig;
 74 | import javax.servlet.ServletException;
 75 | import javax.servlet.ServletRequest;
 76 | import javax.servlet.ServletResponse;
 77 | import javax.servlet.annotation.WebFilter;
 78 | import javax.servlet.http.HttpServletRequest;
 79 | 
 80 | @WebFilter(urlPatterns = "*.do")
 81 | public class LoginRequiredFilter implements Filter {
 82 | 
 83 | 	@Override
 84 | 	public void destroy() {
 85 | 
 86 | 	}
 87 | 
 88 | 	@Override
 89 | 	public void doFilter(ServletRequest servletRequest,
 90 | 			ServletResponse servletResponse, FilterChain chain)
 91 | 			throws IOException, ServletException {
 92 | 		HttpServletRequest request = (HttpServletRequest) servletRequest;
 93 | 
 94 | 		if (request.getSession().getAttribute("name") != null) {
 95 | 			chain.doFilter(servletRequest, servletResponse);
 96 | 		} else {
 97 | 			request.getRequestDispatcher("/login.do").forward(servletRequest,
 98 | 					servletResponse);
 99 | 		}
100 | 	}
101 | 
102 | 	@Override
103 | 	public void init(FilterConfig arg0) throws ServletException {
104 | 	}
105 | 
106 | }
107 | ```
108 | ### src/main/java/com/in28minutes/login/LoginService.java
109 | ```
110 | package com.in28minutes.login;
111 | 
112 | public class LoginService {
113 | 
114 | 	public boolean isUserValid(String user, String password) {
115 | 		if (user.equals("in28Minutes") && password.equals("dummy"))
116 | 			return true;
117 | 
118 | 		return false;
119 | 	}
120 | 
121 | }
122 | ```
123 | ### src/main/java/com/in28minutes/login/LoginServlet.java
124 | ```
125 | package com.in28minutes.login;
126 | 
127 | import java.io.IOException;
128 | 
129 | import javax.servlet.ServletException;
130 | import javax.servlet.annotation.WebServlet;
131 | import javax.servlet.http.HttpServlet;
132 | import javax.servlet.http.HttpServletRequest;
133 | import javax.servlet.http.HttpServletResponse;
134 | 
135 | import com.in28minutes.todo.TodoService;
136 | 
137 | @WebServlet(urlPatterns = "/login.do")
138 | public class LoginServlet extends HttpServlet {
139 | 
140 | 	private LoginService userValidationService = new LoginService();
141 | 	private TodoService todoService = new TodoService();
142 | 
143 | 	protected void doGet(HttpServletRequest request,
144 | 			HttpServletResponse response) throws ServletException, IOException {
145 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
146 | 				request, response);
147 | 	}
148 | 
149 | 	protected void doPost(HttpServletRequest request,
150 | 			HttpServletResponse response) throws ServletException, IOException {
151 | 		String name = request.getParameter("name");
152 | 		String password = request.getParameter("password");
153 | 
154 | 		boolean isUserValid = userValidationService.isUserValid(name, password);
155 | 
156 | 		if (isUserValid) {
157 | 			request.getSession().setAttribute("name", name);
158 | 			response.sendRedirect("/list-todos.do");
159 | 		} else {
160 | 			request.setAttribute("errorMessage", "Invalid Credentials!");
161 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
162 | 					request, response);
163 | 		}
164 | 	}
165 | 
166 | }
167 | ```
168 | ### src/main/java/com/in28minutes/logout/LogoutServlet.java
169 | ```
170 | package com.in28minutes.logout;
171 | 
172 | import java.io.IOException;
173 | 
174 | import javax.servlet.ServletException;
175 | import javax.servlet.annotation.WebServlet;
176 | import javax.servlet.http.HttpServlet;
177 | import javax.servlet.http.HttpServletRequest;
178 | import javax.servlet.http.HttpServletResponse;
179 | 
180 | @WebServlet(urlPatterns = "/logout.do")
181 | public class LogoutServlet extends HttpServlet {
182 | 	protected void doGet(HttpServletRequest request,
183 | 			HttpServletResponse response) throws ServletException, IOException {
184 | 		request.getSession().invalidate();
185 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
186 | 				request, response);
187 | 	}
188 | }
189 | ```
190 | ### src/main/java/com/in28minutes/todo/AddTodoServlet.java
191 | ```
192 | package com.in28minutes.todo;
193 | 
194 | import java.io.IOException;
195 | 
196 | import javax.servlet.ServletException;
197 | import javax.servlet.annotation.WebServlet;
198 | import javax.servlet.http.HttpServlet;
199 | import javax.servlet.http.HttpServletRequest;
200 | import javax.servlet.http.HttpServletResponse;
201 | 
202 | @WebServlet(urlPatterns = "/add-todo.do")
203 | public class AddTodoServlet extends HttpServlet {
204 | 
205 | 	private TodoService todoService = new TodoService();
206 | 
207 | 	protected void doGet(HttpServletRequest request,
208 | 			HttpServletResponse response) throws ServletException, IOException {
209 | 		request.getRequestDispatcher("/WEB-INF/views/add-todo.jsp").forward(
210 | 				request, response);
211 | 	}
212 | 
213 | 	protected void doPost(HttpServletRequest request,
214 | 			HttpServletResponse response) throws ServletException, IOException {
215 | 		String newTodo = request.getParameter("todo");
216 | 		todoService.addTodo(new Todo(newTodo));
217 | 		response.sendRedirect("/list-todos.do");
218 | 	}
219 | }
220 | ```
221 | ### src/main/java/com/in28minutes/todo/DeleteTodoServlet.java
222 | ```
223 | package com.in28minutes.todo;
224 | 
225 | import java.io.IOException;
226 | 
227 | import javax.servlet.ServletException;
228 | import javax.servlet.annotation.WebServlet;
229 | import javax.servlet.http.HttpServlet;
230 | import javax.servlet.http.HttpServletRequest;
231 | import javax.servlet.http.HttpServletResponse;
232 | 
233 | @WebServlet(urlPatterns = "/delete-todo.do")
234 | public class DeleteTodoServlet extends HttpServlet {
235 | 
236 | 	private TodoService todoService = new TodoService();
237 | 
238 | 	protected void doGet(HttpServletRequest request,
239 | 			HttpServletResponse response) throws ServletException, IOException {
240 | 		todoService.deleteTodo(new Todo(request.getParameter("todo")));
241 | 		response.sendRedirect("/list-todos.do");
242 | 	}
243 | }
244 | ```
245 | ### src/main/java/com/in28minutes/todo/ListTodoServlet.java
246 | ```
247 | package com.in28minutes.todo;
248 | 
249 | import java.io.IOException;
250 | 
251 | import javax.servlet.ServletException;
252 | import javax.servlet.annotation.WebServlet;
253 | import javax.servlet.http.HttpServlet;
254 | import javax.servlet.http.HttpServletRequest;
255 | import javax.servlet.http.HttpServletResponse;
256 | 
257 | @WebServlet(urlPatterns = "/list-todos.do")
258 | public class ListTodoServlet extends HttpServlet {
259 | 
260 | 	private TodoService todoService = new TodoService();
261 | 
262 | 	protected void doGet(HttpServletRequest request,
263 | 			HttpServletResponse response) throws ServletException, IOException {
264 | 		request.setAttribute("todos", todoService.retrieveTodos());
265 | 		request.getRequestDispatcher("/WEB-INF/views/list-todos.jsp").forward(
266 | 				request, response);
267 | 	}
268 | }
269 | ```
270 | ### src/main/java/com/in28minutes/todo/Todo.java
271 | ```
272 | package com.in28minutes.todo;
273 | 
274 | public class Todo {
275 | 	private String name;
276 | 
277 | 	public Todo(String name) {
278 | 		super();
279 | 		this.name = name;
280 | 	}
281 | 
282 | 	public String getName() {
283 | 		return name;
284 | 	}
285 | 
286 | 	public void setName(String name) {
287 | 		this.name = name;
288 | 	}
289 | 
290 | 	@Override
291 | 	public String toString() {
292 | 		return String.format("Todo [name=%s]", name);
293 | 	}
294 | 
295 | 	@Override
296 | 	public int hashCode() {
297 | 		final int prime = 31;
298 | 		int result = 1;
299 | 		result = prime * result + ((name == null) ? 0 : name.hashCode());
300 | 		return result;
301 | 	}
302 | 
303 | 	@Override
304 | 	public boolean equals(Object obj) {
305 | 		if (this == obj)
306 | 			return true;
307 | 		if (obj == null)
308 | 			return false;
309 | 		if (getClass() != obj.getClass())
310 | 			return false;
311 | 		Todo other = (Todo) obj;
312 | 		if (name == null) {
313 | 			if (other.name != null)
314 | 				return false;
315 | 		} else if (!name.equals(other.name))
316 | 			return false;
317 | 		return true;
318 | 	}
319 | 
320 | }
321 | ```
322 | ### src/main/java/com/in28minutes/todo/TodoService.java
323 | ```
324 | package com.in28minutes.todo;
325 | 
326 | import java.util.ArrayList;
327 | import java.util.List;
328 | 
329 | public class TodoService {
330 | 	private static List<Todo> todos = new ArrayList<Todo>();
331 | 	static {
332 | 		todos.add(new Todo("Learn Web Application Development"));
333 | 		todos.add(new Todo("Learn Spring MVC"));
334 | 		todos.add(new Todo("Learn Spring Rest Services"));
335 | 	}
336 | 
337 | 	public List<Todo> retrieveTodos() {
338 | 		return todos;
339 | 	}
340 | 
341 | 	public void addTodo(Todo todo) {
342 | 		todos.add(todo);
343 | 	}
344 | 
345 | 	public void deleteTodo(Todo todo) {
346 | 		todos.remove(todo);
347 | 	}
348 | 
349 | }
350 | ```
351 | ### src/main/webapp/WEB-INF/views/add-todo.jsp
352 | ```
353 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
354 | <!DOCTYPE html>
355 | <html>
356 | <head>
357 | <title>Todos</title>
358 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
359 | 	rel="stylesheet">
360 | 
361 | <style>
362 | .footer {
363 | 	position: absolute;
364 | 	bottom: 0;
365 | 	width: 100%;
366 | 	height: 60px;
367 | 	background-color: #f5f5f5;
368 | }
369 | </style>
370 | </head>
371 | 
372 | <body>
373 | 
374 | 	<nav class="navbar navbar-default">
375 | 
376 | 		<a href="/" class="navbar-brand">Brand</a>
377 | 
378 | 		<ul class="nav navbar-nav">
379 | 			<li class="active"><a href="#">Home</a></li>
380 | 			<li><a href="/list-todos.do">Todos</a></li>
381 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
382 | 		</ul>
383 | 
384 | 		<ul class="nav navbar-nav navbar-right">
385 | 			<li><a href="/logout.do">Logout</a></li>
386 | 		</ul>
387 | 
388 | 	</nav>
389 | 
390 | 	<div class="container">
391 | 		Your New Action Item:
392 | 		<form method="POST" action="/add-todo.do">
393 | 			New Todo : <input name="todo" type="text" /> <input name="add"
394 | 				type="submit" />
395 | 		</form>
396 | 	</div>
397 | 
398 | 	<footer class="footer">
399 | 		<div>footer content</div>
400 | 	</footer>
401 | 
402 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
403 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
404 | 
405 | </body>
406 | 
407 | </html>
408 | ```
409 | ### src/main/webapp/WEB-INF/views/list-todos.jsp
410 | ```
411 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
412 | <!DOCTYPE html>
413 | <html>
414 | <head>
415 | <title>Todos</title>
416 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
417 | 	rel="stylesheet">
418 | 
419 | <style>
420 | .footer {
421 | 	position: absolute;
422 | 	bottom: 0;
423 | 	width: 100%;
424 | 	height: 60px;
425 | 	background-color: #f5f5f5;
426 | }
427 | </style>
428 | </head>
429 | 
430 | <body>
431 | 
432 | 	<nav class="navbar navbar-default">
433 | 
434 | 		<a href="/" class="navbar-brand">Brand</a>
435 | 
436 | 		<ul class="nav navbar-nav">
437 | 			<li class="active"><a href="#">Home</a></li>
438 | 			<li><a href="/list-todos.do">Todos</a></li>
439 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
440 | 		</ul>
441 | 
442 | 		<ul class="nav navbar-nav navbar-right">
443 | 			<li><a href="/logout.do">Logout</a></li>
444 | 		</ul>
445 | 
446 | 	</nav>
447 | 
448 | 	<div class="container">
449 | 		<H1>Welcome ${name}</H1>
450 | 
451 | 		Your Todos are
452 | 		<ol>
453 | 			<c:forEach items="${todos}" var="todo">
454 | 				<li>${todo.name}&nbsp;<a
455 | 					href="/delete-todo.do?todo=${todo.name}">Delete</a></li>
456 | 			</c:forEach>
457 | 		</ol>
458 | 
459 | 		<p>
460 | 			<font color="red">${errorMessage}</font>
461 | 		</p>
462 | 		<a
463 | 					href="/add-todo.do">Add New Todo</a>
464 | 	</div>
465 | 
466 | 	<footer class="footer">
467 | 		<div>footer content</div>
468 | 	</footer>
469 | 
470 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
471 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
472 | 
473 | </body>
474 | 
475 | </html>
476 | ```
477 | ### src/main/webapp/WEB-INF/views/login.jsp
478 | ```
479 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
480 | <!DOCTYPE html>
481 | <html>
482 | <head>
483 | <title>Todos</title>
484 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
485 | 	rel="stylesheet">
486 | 
487 | <style>
488 | .footer {
489 | 	position: absolute;
490 | 	bottom: 0;
491 | 	width: 100%;
492 | 	height: 60px;
493 | 	background-color: #f5f5f5;
494 | }
495 | </style>
496 | </head>
497 | 
498 | <body>
499 | 
500 | 	<nav class="navbar navbar-default">
501 | 
502 | 		<a href="/" class="navbar-brand">Brand</a>
503 | 
504 | 		<ul class="nav navbar-nav">
505 | 			<li class="active"><a href="#">Home</a></li>
506 | 			<li><a href="/list-todos.do">Todos</a></li>
507 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
508 | 		</ul>
509 | 
510 | 		<ul class="nav navbar-nav navbar-right">
511 | 			<li><a href="/login.do">Login</a></li>
512 | 		</ul>
513 | 
514 | 	</nav>
515 | 
516 | 	<div class="container">
517 | 		<form action="/login.do" method="post">
518 | 			<p>
519 | 				<font color="red">${errorMessage}</font>
520 | 			</p>
521 | 			Name: <input type="text" name="name" /> Password:<input
522 | 				type="password" name="password" /> <input type="submit"
523 | 				value="Login" />
524 | 		</form>
525 | 
526 | 	</div>
527 | 
528 | 	<footer class="footer">
529 | 		<div>footer content</div>
530 | 	</footer>
531 | 
532 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
533 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
534 | 
535 | </body>
536 | 
537 | </html>
538 | ```
539 | ### src/main/webapp/WEB-INF/web.xml
540 | ```
541 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
542 |     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
543 |     version="3.0">
544 | 
545 |     <display-name>To do List</display-name>
546 | 
547 |     <welcome-file-list>
548 |         <welcome-file>login.do</welcome-file>
549 |     </welcome-file-list>
550 | 
551 | </web-app>
552 | ```
553 | 


--------------------------------------------------------------------------------
/Step25.md:
--------------------------------------------------------------------------------
  1 | ## Files List
  2 | ### pom.xml
  3 | ```
  4 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  5 |     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  6 |     <modelVersion>4.0.0</modelVersion>
  7 |     <groupId>com.in28minutes</groupId>
  8 |     <artifactId>in28Minutes-first-webapp</artifactId>
  9 |     <version>0.0.1-SNAPSHOT</version>
 10 |     <packaging>war</packaging>
 11 | 
 12 |     <dependencies>
 13 |         <dependency>
 14 |             <groupId>javax</groupId>
 15 |             <artifactId>javaee-web-api</artifactId>
 16 |             <version>6.0</version>
 17 |             <scope>provided</scope>
 18 |         </dependency>
 19 |         <dependency>
 20 |             <groupId>javax.servlet</groupId>
 21 |             <artifactId>jstl</artifactId>
 22 |             <version>1.2</version>
 23 |         </dependency>
 24 |  		
 25 |  		<dependency>
 26 |             <groupId>org.webjars</groupId>
 27 |             <artifactId>bootstrap</artifactId>
 28 |             <version>3.3.6</version>
 29 |         </dependency>
 30 |         <dependency>
 31 |             <groupId>org.webjars</groupId>
 32 |             <artifactId>jquery</artifactId>
 33 |             <version>1.9.1</version>
 34 |         </dependency>
 35 |     </dependencies>
 36 | 
 37 |     <build>
 38 |         <pluginManagement>
 39 |             <plugins>
 40 |                 <plugin>
 41 |                     <groupId>org.apache.maven.plugins</groupId>
 42 |                     <artifactId>maven-compiler-plugin</artifactId>
 43 |                     <version>3.2</version>
 44 |                     <configuration>
 45 |                         <verbose>true</verbose>
 46 |                         <source>1.7</source>
 47 |                         <target>1.7</target>
 48 |                         <showWarnings>true</showWarnings>
 49 |                     </configuration>
 50 |                 </plugin>
 51 |                 <plugin>
 52 |                     <groupId>org.apache.tomcat.maven</groupId>
 53 |                     <artifactId>tomcat7-maven-plugin</artifactId>
 54 |                     <version>2.2</version>
 55 |                     <configuration>
 56 |                         <path>/</path>
 57 |                         <contextReloadable>true</contextReloadable>
 58 |                     </configuration>
 59 |                 </plugin>
 60 |             </plugins>
 61 |         </pluginManagement>
 62 |     </build>
 63 | </project>
 64 | ```
 65 | ### src/main/java/com/in28minutes/filter/LoginRequiredFilter.java
 66 | ```
 67 | package com.in28minutes.filter;
 68 | 
 69 | import java.io.IOException;
 70 | 
 71 | import javax.servlet.Filter;
 72 | import javax.servlet.FilterChain;
 73 | import javax.servlet.FilterConfig;
 74 | import javax.servlet.ServletException;
 75 | import javax.servlet.ServletRequest;
 76 | import javax.servlet.ServletResponse;
 77 | import javax.servlet.annotation.WebFilter;
 78 | import javax.servlet.http.HttpServletRequest;
 79 | 
 80 | @WebFilter(urlPatterns = "*.do")
 81 | public class LoginRequiredFilter implements Filter {
 82 | 
 83 | 	@Override
 84 | 	public void destroy() {
 85 | 
 86 | 	}
 87 | 
 88 | 	@Override
 89 | 	public void doFilter(ServletRequest servletRequest,
 90 | 			ServletResponse servletResponse, FilterChain chain)
 91 | 			throws IOException, ServletException {
 92 | 		HttpServletRequest request = (HttpServletRequest) servletRequest;
 93 | 
 94 | 		if (request.getSession().getAttribute("name") != null) {
 95 | 			chain.doFilter(servletRequest, servletResponse);
 96 | 		} else {
 97 | 			request.getRequestDispatcher("/login.do").forward(servletRequest,
 98 | 					servletResponse);
 99 | 		}
100 | 	}
101 | 
102 | 	@Override
103 | 	public void init(FilterConfig arg0) throws ServletException {
104 | 	}
105 | 
106 | }
107 | ```
108 | ### src/main/java/com/in28minutes/login/LoginService.java
109 | ```
110 | package com.in28minutes.login;
111 | 
112 | public class LoginService {
113 | 
114 | 	public boolean isUserValid(String user, String password) {
115 | 		if (user.equals("in28Minutes") && password.equals("dummy"))
116 | 			return true;
117 | 
118 | 		return false;
119 | 	}
120 | 
121 | }
122 | ```
123 | ### src/main/java/com/in28minutes/login/LoginServlet.java
124 | ```
125 | package com.in28minutes.login;
126 | 
127 | import java.io.IOException;
128 | 
129 | import javax.servlet.ServletException;
130 | import javax.servlet.annotation.WebServlet;
131 | import javax.servlet.http.HttpServlet;
132 | import javax.servlet.http.HttpServletRequest;
133 | import javax.servlet.http.HttpServletResponse;
134 | 
135 | import com.in28minutes.todo.TodoService;
136 | 
137 | @WebServlet(urlPatterns = "/login.do")
138 | public class LoginServlet extends HttpServlet {
139 | 
140 | 	private LoginService userValidationService = new LoginService();
141 | 	private TodoService todoService = new TodoService();
142 | 
143 | 	protected void doGet(HttpServletRequest request,
144 | 			HttpServletResponse response) throws ServletException, IOException {
145 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
146 | 				request, response);
147 | 	}
148 | 
149 | 	protected void doPost(HttpServletRequest request,
150 | 			HttpServletResponse response) throws ServletException, IOException {
151 | 		String name = request.getParameter("name");
152 | 		String password = request.getParameter("password");
153 | 
154 | 		boolean isUserValid = userValidationService.isUserValid(name, password);
155 | 
156 | 		if (isUserValid) {
157 | 			request.getSession().setAttribute("name", name);
158 | 			response.sendRedirect("/list-todos.do");
159 | 		} else {
160 | 			request.setAttribute("errorMessage", "Invalid Credentials!");
161 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
162 | 					request, response);
163 | 		}
164 | 	}
165 | 
166 | }
167 | ```
168 | ### src/main/java/com/in28minutes/logout/LogoutServlet.java
169 | ```
170 | package com.in28minutes.logout;
171 | 
172 | import java.io.IOException;
173 | 
174 | import javax.servlet.ServletException;
175 | import javax.servlet.annotation.WebServlet;
176 | import javax.servlet.http.HttpServlet;
177 | import javax.servlet.http.HttpServletRequest;
178 | import javax.servlet.http.HttpServletResponse;
179 | 
180 | @WebServlet(urlPatterns = "/logout.do")
181 | public class LogoutServlet extends HttpServlet {
182 | 	protected void doGet(HttpServletRequest request,
183 | 			HttpServletResponse response) throws ServletException, IOException {
184 | 		request.getSession().invalidate();
185 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
186 | 				request, response);
187 | 	}
188 | }
189 | ```
190 | ### src/main/java/com/in28minutes/todo/AddTodoServlet.java
191 | ```
192 | package com.in28minutes.todo;
193 | 
194 | import java.io.IOException;
195 | 
196 | import javax.servlet.ServletException;
197 | import javax.servlet.annotation.WebServlet;
198 | import javax.servlet.http.HttpServlet;
199 | import javax.servlet.http.HttpServletRequest;
200 | import javax.servlet.http.HttpServletResponse;
201 | 
202 | @WebServlet(urlPatterns = "/add-todo.do")
203 | public class AddTodoServlet extends HttpServlet {
204 | 
205 | 	private TodoService todoService = new TodoService();
206 | 
207 | 	protected void doGet(HttpServletRequest request,
208 | 			HttpServletResponse response) throws ServletException, IOException {
209 | 		request.getRequestDispatcher("/WEB-INF/views/add-todo.jsp").forward(
210 | 				request, response);
211 | 	}
212 | 
213 | 	protected void doPost(HttpServletRequest request,
214 | 			HttpServletResponse response) throws ServletException, IOException {
215 | 		String newTodo = request.getParameter("todo");
216 | 		String category = request.getParameter("category");
217 | 		todoService.addTodo(new Todo(newTodo, category));
218 | 		response.sendRedirect("/list-todos.do");
219 | 	}
220 | }
221 | ```
222 | ### src/main/java/com/in28minutes/todo/DeleteTodoServlet.java
223 | ```
224 | package com.in28minutes.todo;
225 | 
226 | import java.io.IOException;
227 | 
228 | import javax.servlet.ServletException;
229 | import javax.servlet.annotation.WebServlet;
230 | import javax.servlet.http.HttpServlet;
231 | import javax.servlet.http.HttpServletRequest;
232 | import javax.servlet.http.HttpServletResponse;
233 | 
234 | @WebServlet(urlPatterns = "/delete-todo.do")
235 | public class DeleteTodoServlet extends HttpServlet {
236 | 
237 | 	private TodoService todoService = new TodoService();
238 | 
239 | 	protected void doGet(HttpServletRequest request,
240 | 			HttpServletResponse response) throws ServletException, IOException {
241 | 		todoService.deleteTodo(new Todo(request.getParameter("todo"), request
242 | 				.getParameter("category")));
243 | 		response.sendRedirect("/list-todos.do");
244 | 	}
245 | }
246 | ```
247 | ### src/main/java/com/in28minutes/todo/ListTodoServlet.java
248 | ```
249 | package com.in28minutes.todo;
250 | 
251 | import java.io.IOException;
252 | 
253 | import javax.servlet.ServletException;
254 | import javax.servlet.annotation.WebServlet;
255 | import javax.servlet.http.HttpServlet;
256 | import javax.servlet.http.HttpServletRequest;
257 | import javax.servlet.http.HttpServletResponse;
258 | 
259 | @WebServlet(urlPatterns = "/list-todos.do")
260 | public class ListTodoServlet extends HttpServlet {
261 | 
262 | 	private TodoService todoService = new TodoService();
263 | 
264 | 	protected void doGet(HttpServletRequest request,
265 | 			HttpServletResponse response) throws ServletException, IOException {
266 | 		request.setAttribute("todos", todoService.retrieveTodos());
267 | 		request.getRequestDispatcher("/WEB-INF/views/list-todos.jsp").forward(
268 | 				request, response);
269 | 	}
270 | }
271 | ```
272 | ### src/main/java/com/in28minutes/todo/Todo.java
273 | ```
274 | package com.in28minutes.todo;
275 | 
276 | public class Todo {
277 | 	private String name;
278 | 	private String category;
279 | 
280 | 	public Todo(String name, String category) {
281 | 		super();
282 | 		this.name = name;
283 | 		this.category = category;
284 | 	}
285 | 
286 | 	public String getName() {
287 | 		return name;
288 | 	}
289 | 
290 | 	public void setName(String name) {
291 | 		this.name = name;
292 | 	}
293 | 
294 | 	public String getCategory() {
295 | 		return category;
296 | 	}
297 | 
298 | 	public void setCategory(String category) {
299 | 		this.category = category;
300 | 	}
301 | 
302 | 	@Override
303 | 	public String toString() {
304 | 		return String.format("Todo [name=%s, category=%s]", name, category);
305 | 	}
306 | 
307 | 	@Override
308 | 	public int hashCode() {
309 | 		final int prime = 31;
310 | 		int result = 1;
311 | 		result = prime * result + ((name == null) ? 0 : name.hashCode());
312 | 		return result;
313 | 	}
314 | 
315 | 	@Override
316 | 	public boolean equals(Object obj) {
317 | 		if (this == obj)
318 | 			return true;
319 | 		if (obj == null)
320 | 			return false;
321 | 		if (getClass() != obj.getClass())
322 | 			return false;
323 | 		Todo other = (Todo) obj;
324 | 		if (name == null) {
325 | 			if (other.name != null)
326 | 				return false;
327 | 		} else if (!name.equals(other.name))
328 | 			return false;
329 | 		return true;
330 | 	}
331 | 
332 | }
333 | ```
334 | ### src/main/java/com/in28minutes/todo/TodoService.java
335 | ```
336 | package com.in28minutes.todo;
337 | 
338 | import java.util.ArrayList;
339 | import java.util.List;
340 | 
341 | public class TodoService {
342 | 	private static List<Todo> todos = new ArrayList<Todo>();
343 | 	static {
344 | 		todos.add(new Todo("Learn Web Application Development", "Study"));
345 | 		todos.add(new Todo("Learn Spring MVC", "Study"));
346 | 		todos.add(new Todo("Learn Spring Rest Services", "Study"));
347 | 	}
348 | 
349 | 	public List<Todo> retrieveTodos() {
350 | 		return todos;
351 | 	}
352 | 
353 | 	public void addTodo(Todo todo) {
354 | 		todos.add(todo);
355 | 	}
356 | 
357 | 	public void deleteTodo(Todo todo) {
358 | 		todos.remove(todo);
359 | 	}
360 | 
361 | }
362 | ```
363 | ### src/main/webapp/WEB-INF/views/add-todo.jsp
364 | ```
365 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
366 | <!DOCTYPE html>
367 | <html>
368 | <head>
369 | <title>Todos</title>
370 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
371 | 	rel="stylesheet">
372 | 
373 | <style>
374 | .footer {
375 | 	position: absolute;
376 | 	bottom: 0;
377 | 	width: 100%;
378 | 	height: 60px;
379 | 	background-color: #f5f5f5;
380 | }
381 | </style>
382 | </head>
383 | 
384 | <body>
385 | 
386 | 	<nav class="navbar navbar-default">
387 | 
388 | 		<a href="/" class="navbar-brand">Brand</a>
389 | 
390 | 		<ul class="nav navbar-nav">
391 | 			<li class="active"><a href="#">Home</a></li>
392 | 			<li><a href="/list-todos.do">Todos</a></li>
393 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
394 | 		</ul>
395 | 
396 | 		<ul class="nav navbar-nav navbar-right">
397 | 			<li><a href="/logout.do">Logout</a></li>
398 | 		</ul>
399 | 
400 | 	</nav>
401 | 
402 | 	<div class="container">
403 | 		Your New Action Item:
404 | 		<form method="POST" action="/add-todo.do">
405 | 			Description : <input name="todo" type="text" /> <BR/> 
406 | 			Category : <input name="category" type="text" /> <BR/>
407 | 			<input name="add"
408 | 				type="submit" />
409 | 		</form>
410 | 	</div>
411 | 
412 | 	<footer class="footer">
413 | 		<div>footer content</div>
414 | 	</footer>
415 | 
416 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
417 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
418 | 
419 | </body>
420 | 
421 | </html>
422 | ```
423 | ### src/main/webapp/WEB-INF/views/list-todos.jsp
424 | ```
425 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
426 | <!DOCTYPE html>
427 | <html>
428 | <head>
429 | <title>Todos</title>
430 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
431 | 	rel="stylesheet">
432 | 
433 | <style>
434 | .footer {
435 | 	position: absolute;
436 | 	bottom: 0;
437 | 	width: 100%;
438 | 	height: 60px;
439 | 	background-color: #f5f5f5;
440 | }
441 | </style>
442 | </head>
443 | 
444 | <body>
445 | 
446 | 	<nav class="navbar navbar-default">
447 | 
448 | 		<a href="/" class="navbar-brand">Brand</a>
449 | 
450 | 		<ul class="nav navbar-nav">
451 | 			<li class="active"><a href="#">Home</a></li>
452 | 			<li><a href="/list-todos.do">Todos</a></li>
453 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
454 | 		</ul>
455 | 
456 | 		<ul class="nav navbar-nav navbar-right">
457 | 			<li><a href="/logout.do">Logout</a></li>
458 | 		</ul>
459 | 
460 | 	</nav>
461 | 
462 | 	<div class="container">
463 | 		<H1>Welcome ${name}</H1>
464 | 
465 | 		Your Todos are
466 | 		<ol>
467 | 			<c:forEach items="${todos}" var="todo">
468 | 				<li>${todo.name}&nbsp;${todo.category}&nbsp;<a
469 | 					href="/delete-todo.do?todo=${todo.name}&category=${todo.category}">Delete</a></li>
470 | 			</c:forEach>
471 | 		</ol>
472 | 
473 | 		<p>
474 | 			<font color="red">${errorMessage}</font>
475 | 		</p>
476 | 		<a
477 | 					href="/add-todo.do">Add New Todo</a>
478 | 	</div>
479 | 
480 | 	<footer class="footer">
481 | 		<div>footer content</div>
482 | 	</footer>
483 | 
484 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
485 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
486 | 
487 | </body>
488 | 
489 | </html>
490 | ```
491 | ### src/main/webapp/WEB-INF/views/login.jsp
492 | ```
493 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
494 | <!DOCTYPE html>
495 | <html>
496 | <head>
497 | <title>Todos</title>
498 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
499 | 	rel="stylesheet">
500 | 
501 | <style>
502 | .footer {
503 | 	position: absolute;
504 | 	bottom: 0;
505 | 	width: 100%;
506 | 	height: 60px;
507 | 	background-color: #f5f5f5;
508 | }
509 | </style>
510 | </head>
511 | 
512 | <body>
513 | 
514 | 	<nav class="navbar navbar-default">
515 | 
516 | 		<a href="/" class="navbar-brand">Brand</a>
517 | 
518 | 		<ul class="nav navbar-nav">
519 | 			<li class="active"><a href="#">Home</a></li>
520 | 			<li><a href="/list-todos.do">Todos</a></li>
521 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
522 | 		</ul>
523 | 
524 | 		<ul class="nav navbar-nav navbar-right">
525 | 			<li><a href="/login.do">Login</a></li>
526 | 		</ul>
527 | 
528 | 	</nav>
529 | 
530 | 	<div class="container">
531 | 		<form action="/login.do" method="post">
532 | 			<p>
533 | 				<font color="red">${errorMessage}</font>
534 | 			</p>
535 | 			Name: <input type="text" name="name" /> Password:<input
536 | 				type="password" name="password" /> <input type="submit"
537 | 				value="Login" />
538 | 		</form>
539 | 
540 | 	</div>
541 | 
542 | 	<footer class="footer">
543 | 		<div>footer content</div>
544 | 	</footer>
545 | 
546 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
547 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
548 | 
549 | </body>
550 | 
551 | </html>
552 | ```
553 | ### src/main/webapp/WEB-INF/web.xml
554 | ```
555 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
556 |     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
557 |     version="3.0">
558 | 
559 |     <display-name>To do List</display-name>
560 | 
561 |     <welcome-file-list>
562 |         <welcome-file>login.do</welcome-file>
563 |     </welcome-file-list>
564 | 
565 | </web-app>
566 | ```
567 | 


--------------------------------------------------------------------------------
/Step27.md:
--------------------------------------------------------------------------------
  1 | ## Files List
  2 | ### pom.xml
  3 | ```
  4 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  5 |     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  6 |     <modelVersion>4.0.0</modelVersion>
  7 |     <groupId>com.in28minutes</groupId>
  8 |     <artifactId>in28Minutes-first-webapp</artifactId>
  9 |     <version>0.0.1-SNAPSHOT</version>
 10 |     <packaging>war</packaging>
 11 | 
 12 |     <dependencies>
 13 |         <dependency>
 14 |             <groupId>javax</groupId>
 15 |             <artifactId>javaee-web-api</artifactId>
 16 |             <version>6.0</version>
 17 |             <scope>provided</scope>
 18 |         </dependency>
 19 |         <dependency>
 20 |             <groupId>javax.servlet</groupId>
 21 |             <artifactId>jstl</artifactId>
 22 |             <version>1.2</version>
 23 |         </dependency>
 24 |  		
 25 |  		<dependency>
 26 |             <groupId>org.webjars</groupId>
 27 |             <artifactId>bootstrap</artifactId>
 28 |             <version>3.3.6</version>
 29 |         </dependency>
 30 |         <dependency>
 31 |             <groupId>org.webjars</groupId>
 32 |             <artifactId>jquery</artifactId>
 33 |             <version>1.9.1</version>
 34 |         </dependency>
 35 |     </dependencies>
 36 | 
 37 |     <build>
 38 |         <pluginManagement>
 39 |             <plugins>
 40 |                 <plugin>
 41 |                     <groupId>org.apache.maven.plugins</groupId>
 42 |                     <artifactId>maven-compiler-plugin</artifactId>
 43 |                     <version>3.2</version>
 44 |                     <configuration>
 45 |                         <verbose>true</verbose>
 46 |                         <source>1.7</source>
 47 |                         <target>1.7</target>
 48 |                         <showWarnings>true</showWarnings>
 49 |                     </configuration>
 50 |                 </plugin>
 51 |                 <plugin>
 52 |                     <groupId>org.apache.tomcat.maven</groupId>
 53 |                     <artifactId>tomcat7-maven-plugin</artifactId>
 54 |                     <version>2.2</version>
 55 |                     <configuration>
 56 |                         <path>/</path>
 57 |                         <contextReloadable>true</contextReloadable>
 58 |                     </configuration>
 59 |                 </plugin>
 60 |             </plugins>
 61 |         </pluginManagement>
 62 |     </build>
 63 | </project>
 64 | ```
 65 | ### src/main/java/com/in28minutes/filter/LoginRequiredFilter.java
 66 | ```
 67 | package com.in28minutes.filter;
 68 | 
 69 | import java.io.IOException;
 70 | 
 71 | import javax.servlet.Filter;
 72 | import javax.servlet.FilterChain;
 73 | import javax.servlet.FilterConfig;
 74 | import javax.servlet.ServletException;
 75 | import javax.servlet.ServletRequest;
 76 | import javax.servlet.ServletResponse;
 77 | import javax.servlet.annotation.WebFilter;
 78 | import javax.servlet.http.HttpServletRequest;
 79 | 
 80 | @WebFilter(urlPatterns = "*.do")
 81 | public class LoginRequiredFilter implements Filter {
 82 | 
 83 | 	@Override
 84 | 	public void destroy() {
 85 | 
 86 | 	}
 87 | 
 88 | 	@Override
 89 | 	public void doFilter(ServletRequest servletRequest,
 90 | 			ServletResponse servletResponse, FilterChain chain)
 91 | 			throws IOException, ServletException {
 92 | 		HttpServletRequest request = (HttpServletRequest) servletRequest;
 93 | 
 94 | 		if (request.getSession().getAttribute("name") != null) {
 95 | 			chain.doFilter(servletRequest, servletResponse);
 96 | 		} else {
 97 | 			request.getRequestDispatcher("/login.do").forward(servletRequest,
 98 | 					servletResponse);
 99 | 		}
100 | 	}
101 | 
102 | 	@Override
103 | 	public void init(FilterConfig arg0) throws ServletException {
104 | 	}
105 | 
106 | }
107 | ```
108 | ### src/main/java/com/in28minutes/login/LoginService.java
109 | ```
110 | package com.in28minutes.login;
111 | 
112 | public class LoginService {
113 | 
114 | 	public boolean isUserValid(String user, String password) {
115 | 		if (user.equals("in28Minutes") && password.equals("dummy"))
116 | 			return true;
117 | 
118 | 		return false;
119 | 	}
120 | 
121 | }
122 | ```
123 | ### src/main/java/com/in28minutes/login/LoginServlet.java
124 | ```
125 | package com.in28minutes.login;
126 | 
127 | import java.io.IOException;
128 | 
129 | import javax.servlet.ServletException;
130 | import javax.servlet.annotation.WebServlet;
131 | import javax.servlet.http.HttpServlet;
132 | import javax.servlet.http.HttpServletRequest;
133 | import javax.servlet.http.HttpServletResponse;
134 | 
135 | import com.in28minutes.todo.TodoService;
136 | 
137 | @WebServlet(urlPatterns = "/login.do")
138 | public class LoginServlet extends HttpServlet {
139 | 
140 | 	private LoginService userValidationService = new LoginService();
141 | 	private TodoService todoService = new TodoService();
142 | 
143 | 	protected void doGet(HttpServletRequest request,
144 | 			HttpServletResponse response) throws ServletException, IOException {
145 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
146 | 				request, response);
147 | 	}
148 | 
149 | 	protected void doPost(HttpServletRequest request,
150 | 			HttpServletResponse response) throws ServletException, IOException {
151 | 		String name = request.getParameter("name");
152 | 		String password = request.getParameter("password");
153 | 
154 | 		boolean isUserValid = userValidationService.isUserValid(name, password);
155 | 
156 | 		if (isUserValid) {
157 | 			request.getSession().setAttribute("name", name);
158 | 			response.sendRedirect("/list-todos.do");
159 | 		} else {
160 | 			request.setAttribute("errorMessage", "Invalid Credentials!");
161 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
162 | 					request, response);
163 | 		}
164 | 	}
165 | 
166 | }
167 | ```
168 | ### src/main/java/com/in28minutes/logout/LogoutServlet.java
169 | ```
170 | package com.in28minutes.logout;
171 | 
172 | import java.io.IOException;
173 | 
174 | import javax.servlet.ServletException;
175 | import javax.servlet.annotation.WebServlet;
176 | import javax.servlet.http.HttpServlet;
177 | import javax.servlet.http.HttpServletRequest;
178 | import javax.servlet.http.HttpServletResponse;
179 | 
180 | @WebServlet(urlPatterns = "/logout.do")
181 | public class LogoutServlet extends HttpServlet {
182 | 	protected void doGet(HttpServletRequest request,
183 | 			HttpServletResponse response) throws ServletException, IOException {
184 | 		request.getSession().invalidate();
185 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
186 | 				request, response);
187 | 	}
188 | }
189 | ```
190 | ### src/main/java/com/in28minutes/todo/AddTodoServlet.java
191 | ```
192 | package com.in28minutes.todo;
193 | 
194 | import java.io.IOException;
195 | 
196 | import javax.servlet.ServletException;
197 | import javax.servlet.annotation.WebServlet;
198 | import javax.servlet.http.HttpServlet;
199 | import javax.servlet.http.HttpServletRequest;
200 | import javax.servlet.http.HttpServletResponse;
201 | 
202 | @WebServlet(urlPatterns = "/add-todo.do")
203 | public class AddTodoServlet extends HttpServlet {
204 | 
205 | 	private TodoService todoService = new TodoService();
206 | 
207 | 	protected void doGet(HttpServletRequest request,
208 | 			HttpServletResponse response) throws ServletException, IOException {
209 | 		request.getRequestDispatcher("/WEB-INF/views/add-todo.jsp").forward(
210 | 				request, response);
211 | 	}
212 | 
213 | 	protected void doPost(HttpServletRequest request,
214 | 			HttpServletResponse response) throws ServletException, IOException {
215 | 		String newTodo = request.getParameter("todo");
216 | 		String category = request.getParameter("category");
217 | 		todoService.addTodo(new Todo(newTodo, category));
218 | 		response.sendRedirect("/list-todos.do");
219 | 	}
220 | }
221 | ```
222 | ### src/main/java/com/in28minutes/todo/DeleteTodoServlet.java
223 | ```
224 | package com.in28minutes.todo;
225 | 
226 | import java.io.IOException;
227 | 
228 | import javax.servlet.ServletException;
229 | import javax.servlet.annotation.WebServlet;
230 | import javax.servlet.http.HttpServlet;
231 | import javax.servlet.http.HttpServletRequest;
232 | import javax.servlet.http.HttpServletResponse;
233 | 
234 | @WebServlet(urlPatterns = "/delete-todo.do")
235 | public class DeleteTodoServlet extends HttpServlet {
236 | 
237 | 	private TodoService todoService = new TodoService();
238 | 
239 | 	protected void doGet(HttpServletRequest request,
240 | 			HttpServletResponse response) throws ServletException, IOException {
241 | 		todoService.deleteTodo(new Todo(request.getParameter("todo"), request
242 | 				.getParameter("category")));
243 | 		response.sendRedirect("/list-todos.do");
244 | 	}
245 | }
246 | ```
247 | ### src/main/java/com/in28minutes/todo/ListTodoServlet.java
248 | ```
249 | package com.in28minutes.todo;
250 | 
251 | import java.io.IOException;
252 | 
253 | import javax.servlet.ServletException;
254 | import javax.servlet.annotation.WebServlet;
255 | import javax.servlet.http.HttpServlet;
256 | import javax.servlet.http.HttpServletRequest;
257 | import javax.servlet.http.HttpServletResponse;
258 | 
259 | @WebServlet(urlPatterns = "/list-todos.do")
260 | public class ListTodoServlet extends HttpServlet {
261 | 
262 | 	private TodoService todoService = new TodoService();
263 | 
264 | 	protected void doGet(HttpServletRequest request,
265 | 			HttpServletResponse response) throws ServletException, IOException {
266 | 		request.setAttribute("todos", todoService.retrieveTodos());
267 | 		request.getRequestDispatcher("/WEB-INF/views/list-todos.jsp").forward(
268 | 				request, response);
269 | 	}
270 | }
271 | ```
272 | ### src/main/java/com/in28minutes/todo/Todo.java
273 | ```
274 | package com.in28minutes.todo;
275 | 
276 | public class Todo {
277 | 	private String name;
278 | 	private String category;
279 | 
280 | 	public Todo(String name, String category) {
281 | 		super();
282 | 		this.name = name;
283 | 		this.category = category;
284 | 	}
285 | 
286 | 	public String getName() {
287 | 		return name;
288 | 	}
289 | 
290 | 	public void setName(String name) {
291 | 		this.name = name;
292 | 	}
293 | 
294 | 	public String getCategory() {
295 | 		return category;
296 | 	}
297 | 
298 | 	public void setCategory(String category) {
299 | 		this.category = category;
300 | 	}
301 | 
302 | 	@Override
303 | 	public String toString() {
304 | 		return String.format("Todo [name=%s, category=%s]", name, category);
305 | 	}
306 | 
307 | 	@Override
308 | 	public int hashCode() {
309 | 		final int prime = 31;
310 | 		int result = 1;
311 | 		result = prime * result + ((name == null) ? 0 : name.hashCode());
312 | 		return result;
313 | 	}
314 | 
315 | 	@Override
316 | 	public boolean equals(Object obj) {
317 | 		if (this == obj)
318 | 			return true;
319 | 		if (obj == null)
320 | 			return false;
321 | 		if (getClass() != obj.getClass())
322 | 			return false;
323 | 		Todo other = (Todo) obj;
324 | 		if (name == null) {
325 | 			if (other.name != null)
326 | 				return false;
327 | 		} else if (!name.equals(other.name))
328 | 			return false;
329 | 		return true;
330 | 	}
331 | 
332 | }
333 | ```
334 | ### src/main/java/com/in28minutes/todo/TodoService.java
335 | ```
336 | package com.in28minutes.todo;
337 | 
338 | import java.util.ArrayList;
339 | import java.util.List;
340 | 
341 | public class TodoService {
342 | 	private static List<Todo> todos = new ArrayList<Todo>();
343 | 	static {
344 | 		todos.add(new Todo("Learn Web Application Development", "Study"));
345 | 		todos.add(new Todo("Learn Spring MVC", "Study"));
346 | 		todos.add(new Todo("Learn Spring Rest Services", "Study"));
347 | 	}
348 | 
349 | 	public List<Todo> retrieveTodos() {
350 | 		return todos;
351 | 	}
352 | 
353 | 	public void addTodo(Todo todo) {
354 | 		todos.add(todo);
355 | 	}
356 | 
357 | 	public void deleteTodo(Todo todo) {
358 | 		todos.remove(todo);
359 | 	}
360 | 
361 | }
362 | ```
363 | ### src/main/webapp/WEB-INF/common/footer.jspf
364 | ```
365 | 
366 | <footer class="footer">
367 | 	<div>footer content</div>
368 | </footer>
369 | 
370 | <script src="webjars/jquery/1.9.1/jquery.min.js"></script>
371 | <script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
372 | 
373 | </body>
374 | 
375 | </html>
376 | ```
377 | ### src/main/webapp/WEB-INF/common/header.jspf
378 | ```
379 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
380 | <!DOCTYPE html>
381 | <html>
382 | <head>
383 | <title>Todos</title>
384 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
385 | 	rel="stylesheet">
386 | 
387 | <style>
388 | .footer {
389 | 	position: absolute;
390 | 	bottom: 0;
391 | 	width: 100%;
392 | 	height: 60px;
393 | 	background-color: #f5f5f5;
394 | }
395 | </style>
396 | </head>
397 | 
398 | <body>
399 | ```
400 | ### src/main/webapp/WEB-INF/common/navigation.jspf
401 | ```
402 | 	<nav class="navbar navbar-default">
403 | 
404 | 		<a href="/" class="navbar-brand">Brand</a>
405 | 
406 | 		<ul class="nav navbar-nav">
407 | 			<li class="active"><a href="#">Home</a></li>
408 | 			<li><a href="/list-todos.do">Todos</a></li>
409 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
410 | 		</ul>
411 | 
412 | 		<ul class="nav navbar-nav navbar-right">
413 | 			<li><a href="/logout.do">Logout</a></li>
414 | 		</ul>
415 | 
416 | 	</nav>
417 | ```
418 | ### src/main/webapp/WEB-INF/views/add-todo.jsp
419 | ```
420 | <%@ include file="../common/header.jspf"%>
421 | <%@ include file="../common/navigation.jspf"%>
422 | 
423 | 
424 | <div class="container">
425 | 	Your New Action Item:
426 | 	<form method="POST" action="/add-todo.do">
427 | 		<fieldset class="form-group">
428 | 			<label>Description</label> <input name="todo" type="text"
429 | 				class="form-control" /> <BR />
430 | 		</fieldset>
431 | 		<fieldset class="form-group">
432 | 			<label>Category</label> <input name="category" type="text"
433 | 				class="form-control" /> <BR />
434 | 		</fieldset>
435 | 		<input name="add" type="submit" class="btn btn-success" value="Submit" />
436 | 	</form>
437 | </div>
438 | 
439 | <%@ include file="../common/footer.jspf"%>
440 | ```
441 | ### src/main/webapp/WEB-INF/views/list-todos.jsp
442 | ```
443 | <%@ include file="../common/header.jspf"%>
444 | <%@ include file="../common/navigation.jspf"%>
445 | 
446 | <div class="container">
447 | 	<H1>Welcome ${name}</H1>
448 | 
449 | 
450 | 	<table class="table table-striped">
451 | 		<caption>Your Todos are</caption>
452 | 		<thead>
453 | 			<th>Description</th>
454 | 			<th>Category</th>
455 | 			<th>Actions</th>
456 | 		</thead>
457 | 		<tbody>
458 | 			<c:forEach items="${todos}" var="todo">
459 | 				<tr>
460 | 					<td>${todo.name}</td>
461 | 					<td>${todo.category}</td>
462 | 					<td>&nbsp;&nbsp;<a class="btn btn-danger"
463 | 						href="/delete-todo.do?todo=${todo.name}&category=${todo.category}">Delete</a></td>
464 | 				</tr>
465 | 			</c:forEach>
466 | 		</tbody>
467 | 	</table>
468 | 
469 | 	<p>
470 | 		<font color="red">${errorMessage}</font>
471 | 	</p>
472 | 	<a class="btn btn-success" href="/add-todo.do">Add New Todo</a>
473 | </div>
474 | 
475 | <%@ include file="../common/footer.jspf"%>
476 | ```
477 | ### src/main/webapp/WEB-INF/views/login.jsp
478 | ```
479 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
480 | <!DOCTYPE html>
481 | <html>
482 | <head>
483 | <title>Todos</title>
484 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
485 | 	rel="stylesheet">
486 | 
487 | <style>
488 | .footer {
489 | 	position: absolute;
490 | 	bottom: 0;
491 | 	width: 100%;
492 | 	height: 60px;
493 | 	background-color: #f5f5f5;
494 | }
495 | </style>
496 | </head>
497 | 
498 | <body>
499 | 
500 | 	<nav class="navbar navbar-default">
501 | 
502 | 		<a href="/" class="navbar-brand">Brand</a>
503 | 
504 | 		<ul class="nav navbar-nav">
505 | 			<li class="active"><a href="#">Home</a></li>
506 | 			<li><a href="/list-todos.do">Todos</a></li>
507 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
508 | 		</ul>
509 | 
510 | 		<ul class="nav navbar-nav navbar-right">
511 | 			<li><a href="/login.do">Login</a></li>
512 | 		</ul>
513 | 
514 | 	</nav>
515 | 
516 | 	<div class="container">
517 | 		<form action="/login.do" method="post">
518 | 			<p>
519 | 				<font color="red">${errorMessage}</font>
520 | 			</p>
521 | 			Name: <input type="text" name="name" /> Password:<input
522 | 				type="password" name="password" /> <input type="submit"
523 | 				value="Login" />
524 | 		</form>
525 | 
526 | 	</div>
527 | 
528 | 	<footer class="footer">
529 | 		<div>footer content</div>
530 | 	</footer>
531 | 
532 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
533 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
534 | 
535 | </body>
536 | 
537 | </html>
538 | ```
539 | ### src/main/webapp/WEB-INF/web.xml
540 | ```
541 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
542 |     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
543 |     version="3.0">
544 | 
545 |     <display-name>To do List</display-name>
546 | 
547 |     <welcome-file-list>
548 |         <welcome-file>login.do</welcome-file>
549 |     </welcome-file-list>
550 | 
551 | </web-app>
552 | ```
553 | 


--------------------------------------------------------------------------------
/pom.xml:
--------------------------------------------------------------------------------
 1 | <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3 |     <modelVersion>4.0.0</modelVersion>
 4 |     <groupId>com.in28minutes</groupId>
 5 |     <artifactId>in28Minutes-first-webapp</artifactId>
 6 |     <version>0.0.1-SNAPSHOT</version>
 7 |     <packaging>war</packaging>
 8 | 
 9 |     <dependencies>
10 |         <dependency>
11 |             <groupId>javax</groupId>
12 |             <artifactId>javaee-web-api</artifactId>
13 |             <version>6.0</version>
14 |             <scope>provided</scope>
15 |         </dependency>
16 |         <dependency>
17 |             <groupId>javax.servlet</groupId>
18 |             <artifactId>jstl</artifactId>
19 |             <version>1.2</version>
20 |         </dependency>
21 |  		
22 |  		<dependency>
23 |             <groupId>org.webjars</groupId>
24 |             <artifactId>bootstrap</artifactId>
25 |             <version>3.3.6</version>
26 |         </dependency>
27 |         <dependency>
28 |             <groupId>org.webjars</groupId>
29 |             <artifactId>jquery</artifactId>
30 |             <version>1.9.1</version>
31 |         </dependency>
32 |     </dependencies>
33 | 
34 |     <build>
35 |         <pluginManagement>
36 |             <plugins>
37 |                 <plugin>
38 |                     <groupId>org.apache.maven.plugins</groupId>
39 |                     <artifactId>maven-compiler-plugin</artifactId>
40 |                     <version>3.2</version>
41 |                     <configuration>
42 |                         <verbose>true</verbose>
43 |                         <source>1.7</source>
44 |                         <target>1.7</target>
45 |                         <showWarnings>true</showWarnings>
46 |                     </configuration>
47 |                 </plugin>
48 |                 <plugin>
49 |                     <groupId>org.apache.tomcat.maven</groupId>
50 |                     <artifactId>tomcat7-maven-plugin</artifactId>
51 |                     <version>2.2</version>
52 |                     <configuration>
53 |                         <path>/</path>
54 |                         <contextReloadable>true</contextReloadable>
55 |                     </configuration>
56 |                 </plugin>
57 |             </plugins>
58 |         </pluginManagement>
59 |     </build>
60 | </project>


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/filter/LoginRequiredFilter.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.filter;
 2 | 
 3 | import java.io.IOException;
 4 | 
 5 | import javax.servlet.Filter;
 6 | import javax.servlet.FilterChain;
 7 | import javax.servlet.FilterConfig;
 8 | import javax.servlet.ServletException;
 9 | import javax.servlet.ServletRequest;
10 | import javax.servlet.ServletResponse;
11 | import javax.servlet.annotation.WebFilter;
12 | import javax.servlet.http.HttpServletRequest;
13 | 
14 | @WebFilter(urlPatterns = "*.do")
15 | public class LoginRequiredFilter implements Filter {
16 | 
17 | 	@Override
18 | 	public void destroy() {
19 | 
20 | 	}
21 | 
22 | 	@Override
23 | 	public void doFilter(ServletRequest servletRequest,
24 | 			ServletResponse servletResponse, FilterChain chain)
25 | 			throws IOException, ServletException {
26 | 		HttpServletRequest request = (HttpServletRequest) servletRequest;
27 | 
28 | 		if (request.getSession().getAttribute("name") != null) {
29 | 			chain.doFilter(servletRequest, servletResponse);
30 | 		} else {
31 | 			request.getRequestDispatcher("/login.do").forward(servletRequest,
32 | 					servletResponse);
33 | 		}
34 | 	}
35 | 
36 | 	@Override
37 | 	public void init(FilterConfig arg0) throws ServletException {
38 | 	}
39 | 
40 | }
41 | 


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/login/LoginService.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.login;
 2 | 
 3 | public class LoginService {
 4 | 
 5 | 	public boolean isUserValid(String user, String password) {
 6 | 		if (user.equals("in28Minutes") && password.equals("dummy"))
 7 | 			return true;
 8 | 
 9 | 		return false;
10 | 	}
11 | 
12 | }
13 | 


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/login/LoginServlet.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.login;
 2 | 
 3 | import java.io.IOException;
 4 | 
 5 | import javax.servlet.ServletException;
 6 | import javax.servlet.annotation.WebServlet;
 7 | import javax.servlet.http.HttpServlet;
 8 | import javax.servlet.http.HttpServletRequest;
 9 | import javax.servlet.http.HttpServletResponse;
10 | 
11 | import com.in28minutes.todo.TodoService;
12 | 
13 | /*
14 | 
15 |  // Method descriptor #15 ()V
16 |  public void init() throws javax.servlet.ServletException;
17 | 
18 |  // Method descriptor #37 (Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V
19 |  public void service(javax.servlet.ServletRequest arg0, javax.servlet.ServletResponse arg1) throws javax.servlet.ServletException, java.io.IOException;
20 | 
21 |  // Method descriptor #15 ()V
22 |  public void destroy();
23 | 
24 |  */
25 | @WebServlet(urlPatterns = "/login.do")
26 | public class LoginServlet extends HttpServlet {
27 | 
28 | 	private LoginService userValidationService = new LoginService();
29 | 	private TodoService todoService = new TodoService();
30 | 
31 | 	protected void doGet(HttpServletRequest request,
32 | 			HttpServletResponse response) throws ServletException, IOException {
33 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
34 | 				request, response);
35 | 	}
36 | 
37 | 	protected void doPost(HttpServletRequest request,
38 | 			HttpServletResponse response) throws ServletException, IOException {
39 | 		String name = request.getParameter("name");
40 | 		String password = request.getParameter("password");
41 | 
42 | 		boolean isUserValid = userValidationService.isUserValid(name, password);
43 | 
44 | 		if (isUserValid) {
45 | 			request.getSession().setAttribute("name", name);
46 | 			response.sendRedirect("/list-todos.do");
47 | 		} else {
48 | 			request.setAttribute("errorMessage", "Invalid Credentials!");
49 | 			request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
50 | 					request, response);
51 | 		}
52 | 	}
53 | 
54 | }


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/logout/LogoutServlet.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.logout;
 2 | 
 3 | import java.io.IOException;
 4 | 
 5 | import javax.servlet.ServletException;
 6 | import javax.servlet.annotation.WebServlet;
 7 | import javax.servlet.http.HttpServlet;
 8 | import javax.servlet.http.HttpServletRequest;
 9 | import javax.servlet.http.HttpServletResponse;
10 | 
11 | @WebServlet(urlPatterns = "/logout.do")
12 | public class LogoutServlet extends HttpServlet {
13 | 	protected void doGet(HttpServletRequest request,
14 | 			HttpServletResponse response) throws ServletException, IOException {
15 | 		request.getSession().invalidate();
16 | 		request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(
17 | 				request, response);
18 | 	}
19 | }


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/todo/AddTodoServlet.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.todo;
 2 | 
 3 | import java.io.IOException;
 4 | 
 5 | import javax.servlet.ServletException;
 6 | import javax.servlet.annotation.WebServlet;
 7 | import javax.servlet.http.HttpServlet;
 8 | import javax.servlet.http.HttpServletRequest;
 9 | import javax.servlet.http.HttpServletResponse;
10 | 
11 | //INITIALIZATION OF JSP
12 | //CREATE add_002dtodo_jsp.java from add-todo.jsp
13 | //compile add_002dtodo_jsp.java to add_002dtodo_jsp.class
14 | //call _jspInit
15 | 
16 | //SERVICE -> _jspService
17 | 
18 | //DESTROY -> _jspDestroy
19 | 
20 | @WebServlet(urlPatterns = "/add-todo.do")
21 | public class AddTodoServlet extends HttpServlet {
22 | 
23 | 	private TodoService todoService = new TodoService();
24 | 
25 | 	protected void doGet(HttpServletRequest request,
26 | 			HttpServletResponse response) throws ServletException, IOException {
27 | 		request.getRequestDispatcher("/WEB-INF/views/add-todo.jsp").forward(
28 | 				request, response);
29 | 	}
30 | 
31 | 	protected void doPost(HttpServletRequest request,
32 | 			HttpServletResponse response) throws ServletException, IOException {
33 | 		String newTodo = request.getParameter("todo");
34 | 		String category = request.getParameter("category");
35 | 		todoService.addTodo(new Todo(newTodo, category));
36 | 		response.sendRedirect("/list-todos.do");
37 | 	}
38 | }


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/todo/DeleteTodoServlet.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.todo;
 2 | 
 3 | import java.io.IOException;
 4 | 
 5 | import javax.servlet.ServletException;
 6 | import javax.servlet.annotation.WebServlet;
 7 | import javax.servlet.http.HttpServlet;
 8 | import javax.servlet.http.HttpServletRequest;
 9 | import javax.servlet.http.HttpServletResponse;
10 | 
11 | @WebServlet(urlPatterns = "/delete-todo.do")
12 | public class DeleteTodoServlet extends HttpServlet {
13 | 
14 | 	private TodoService todoService = new TodoService();
15 | 
16 | 	protected void doGet(HttpServletRequest request,
17 | 			HttpServletResponse response) throws ServletException, IOException {
18 | 		todoService.deleteTodo(new Todo(request.getParameter("todo"), request
19 | 				.getParameter("category")));
20 | 		response.sendRedirect("/list-todos.do");
21 | 	}
22 | }


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/todo/ListTodoServlet.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.todo;
 2 | 
 3 | import java.io.IOException;
 4 | 
 5 | import javax.servlet.ServletException;
 6 | import javax.servlet.annotation.WebServlet;
 7 | import javax.servlet.http.HttpServlet;
 8 | import javax.servlet.http.HttpServletRequest;
 9 | import javax.servlet.http.HttpServletResponse;
10 | 
11 | @WebServlet(urlPatterns = "/list-todos.do")
12 | public class ListTodoServlet extends HttpServlet {
13 | 
14 | 	private TodoService todoService = new TodoService();
15 | 
16 | 	protected void doGet(HttpServletRequest request,
17 | 			HttpServletResponse response) throws ServletException, IOException {
18 | 		request.setAttribute("todos", todoService.retrieveTodos());
19 | 		request.getRequestDispatcher("/WEB-INF/views/list-todos.jsp").forward(
20 | 				request, response);
21 | 	}
22 | }


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/todo/Todo.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.todo;
 2 | 
 3 | public class Todo {
 4 | 	private String name;
 5 | 	private String category;
 6 | 
 7 | 	public Todo(String name, String category) {
 8 | 		super();
 9 | 		this.name = name;
10 | 		this.category = category;
11 | 	}
12 | 
13 | 	public String getName() {
14 | 		return name;
15 | 	}
16 | 
17 | 	public void setName(String name) {
18 | 		this.name = name;
19 | 	}
20 | 
21 | 	public String getCategory() {
22 | 		return category;
23 | 	}
24 | 
25 | 	public void setCategory(String category) {
26 | 		this.category = category;
27 | 	}
28 | 
29 | 	@Override
30 | 	public String toString() {
31 | 		return String.format("Todo [name=%s, category=%s]", name, category);
32 | 	}
33 | 
34 | 	@Override
35 | 	public int hashCode() {
36 | 		final int prime = 31;
37 | 		int result = 1;
38 | 		result = prime * result + ((name == null) ? 0 : name.hashCode());
39 | 		return result;
40 | 	}
41 | 
42 | 	@Override
43 | 	public boolean equals(Object obj) {
44 | 		if (this == obj)
45 | 			return true;
46 | 		if (obj == null)
47 | 			return false;
48 | 		if (getClass() != obj.getClass())
49 | 			return false;
50 | 		Todo other = (Todo) obj;
51 | 		if (name == null) {
52 | 			if (other.name != null)
53 | 				return false;
54 | 		} else if (!name.equals(other.name))
55 | 			return false;
56 | 		return true;
57 | 	}
58 | 
59 | }
60 | 


--------------------------------------------------------------------------------
/src/main/java/com/in28minutes/todo/TodoService.java:
--------------------------------------------------------------------------------
 1 | package com.in28minutes.todo;
 2 | 
 3 | import java.util.ArrayList;
 4 | import java.util.List;
 5 | 
 6 | public class TodoService {
 7 | 	private static List<Todo> todos = new ArrayList<Todo>();
 8 | 	static {
 9 | 		todos.add(new Todo("Learn Web Application Development", "Study"));
10 | 		todos.add(new Todo("Learn Spring MVC", "Study"));
11 | 		todos.add(new Todo("Learn Spring Rest Services", "Study"));
12 | 	}
13 | 
14 | 	public List<Todo> retrieveTodos() {
15 | 		return todos;
16 | 	}
17 | 
18 | 	public void addTodo(Todo todo) {
19 | 		todos.add(todo);
20 | 	}
21 | 
22 | 	public void deleteTodo(Todo todo) {
23 | 		todos.remove(todo);
24 | 	}
25 | 
26 | }
27 | 


--------------------------------------------------------------------------------
/src/main/webapp/WEB-INF/common/footer.jspf:
--------------------------------------------------------------------------------
 1 | 
 2 | <footer class="footer">
 3 | 	<div>footer content</div>
 4 | </footer>
 5 | 
 6 | <script src="webjars/jquery/1.9.1/jquery.min.js"></script>
 7 | <script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
 8 | 
 9 | </body>
10 | 
11 | </html>


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/src/main/webapp/WEB-INF/common/header.jspf:
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 1 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 2 | <!DOCTYPE html>
 3 | <html>
 4 | <head>
 5 | <title>Todos</title>
 6 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
 7 | 	rel="stylesheet">
 8 | 
 9 | <style>
10 | .footer {
11 | 	position: absolute;
12 | 	bottom: 0;
13 | 	width: 100%;
14 | 	height: 60px;
15 | 	background-color: #f5f5f5;
16 | }
17 | </style>
18 | </head>
19 | 
20 | <body>


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/src/main/webapp/WEB-INF/common/navigation.jspf:
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 1 | 	<nav class="navbar navbar-default">
 2 | 
 3 | 		<a href="/" class="navbar-brand">Brand</a>
 4 | 
 5 | 		<ul class="nav navbar-nav">
 6 | 			<li class="active"><a href="#">Home</a></li>
 7 | 			<li><a href="/list-todos.do">Todos</a></li>
 8 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
 9 | 		</ul>
10 | 
11 | 		<ul class="nav navbar-nav navbar-right">
12 | 			<li><a href="/logout.do">Logout</a></li>
13 | 		</ul>
14 | 
15 | 	</nav>
16 | 


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/src/main/webapp/WEB-INF/views/add-todo.jsp:
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 1 | <%@ include file="../common/header.jspf"%>
 2 | <%@ include file="../common/navigation.jspf"%>
 3 | 
 4 | 
 5 | <div class="container">
 6 | 	Your New Action Item:
 7 | 	<form method="POST" action="/add-todo.do">
 8 | 		<fieldset class="form-group">
 9 | 			<label>Description</label> <input name="todo" type="text"
10 | 				class="form-control" /> <BR />
11 | 		</fieldset>
12 | 		<fieldset class="form-group">
13 | 			<label>Category</label> <input name="category" type="text"
14 | 				class="form-control" /> <BR />
15 | 		</fieldset>
16 | 		<input name="add" type="submit" class="btn btn-success" value="Submit" />
17 | 	</form>
18 | </div>
19 | 
20 | <%@ include file="../common/footer.jspf"%>


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/src/main/webapp/WEB-INF/views/list-todos.jsp:
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 1 | <%@ include file="../common/header.jspf"%>
 2 | <%@ include file="../common/navigation.jspf"%>
 3 | 
 4 | <div class="container">
 5 | 	<H1>Welcome ${name}</H1>
 6 | 
 7 | 
 8 | 	<table class="table table-striped">
 9 | 		<caption>Your Todos are</caption>
10 | 		<thead>
11 | 			<th>Description</th>
12 | 			<th>Category</th>
13 | 			<th>Actions</th>
14 | 		</thead>
15 | 		<tbody>
16 | 			<c:forEach items="${todos}" var="todo">
17 | 				<tr>
18 | 					<td>${todo.name}</td>
19 | 					<td>${todo.category}</td>
20 | 					<td>&nbsp;&nbsp;<a class="btn btn-danger"
21 | 						href="/delete-todo.do?todo=${todo.name}&category=${todo.category}">Delete</a></td>
22 | 				</tr>
23 | 			</c:forEach>
24 | 		</tbody>
25 | 	</table>
26 | 
27 | 	<p>
28 | 		<font color="red">${errorMessage}</font>
29 | 	</p>
30 | 	<a class="btn btn-success" href="/add-todo.do">Add New Todo</a>
31 | </div>
32 | 
33 | <%@ include file="../common/footer.jspf"%>


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/src/main/webapp/WEB-INF/views/login.jsp:
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 1 | <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 2 | <!DOCTYPE html>
 3 | <html>
 4 | <head>
 5 | <title>Todos</title>
 6 | <link href="webjars/bootstrap/3.3.6/css/bootstrap.min.css"
 7 | 	rel="stylesheet">
 8 | 
 9 | <style>
10 | .footer {
11 | 	position: absolute;
12 | 	bottom: 0;
13 | 	width: 100%;
14 | 	height: 60px;
15 | 	background-color: #f5f5f5;
16 | }
17 | </style>
18 | </head>
19 | 
20 | <body>
21 | 
22 | 	<nav class="navbar navbar-default">
23 | 
24 | 		<a href="/" class="navbar-brand">Brand</a>
25 | 
26 | 		<ul class="nav navbar-nav">
27 | 			<li class="active"><a href="#">Home</a></li>
28 | 			<li><a href="/list-todos.do">Todos</a></li>
29 | 			<li><a href="http://www.in28minutes.com">In28Minutes</a></li>
30 | 		</ul>
31 | 
32 | 		<ul class="nav navbar-nav navbar-right">
33 | 			<li><a href="/login.do">Login</a></li>
34 | 		</ul>
35 | 
36 | 	</nav>
37 | 
38 | 	<div class="container">
39 | 		<form action="/login.do" method="post">
40 | 			<p>
41 | 				<font color="red">${errorMessage}</font>
42 | 			</p>
43 | 			Name: <input type="text" name="name" /> Password:<input
44 | 				type="password" name="password" /> <input type="submit"
45 | 				value="Login" />
46 | 		</form>
47 | 
48 | 	</div>
49 | 
50 | 	<footer class="footer">
51 | 		<div>footer content</div>
52 | 	</footer>
53 | 
54 | 	<script src="webjars/jquery/1.9.1/jquery.min.js"></script>
55 | 	<script src="webjars/bootstrap/3.3.6/js/bootstrap.min.js"></script>
56 | 
57 | </body>
58 | 
59 | </html>


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/src/main/webapp/WEB-INF/web.xml:
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 1 | <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2 |     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
 3 |     version="3.0">
 4 | 
 5 |     <display-name>To do List</display-name>
 6 | 
 7 |     <welcome-file-list>
 8 |         <welcome-file>login.do</welcome-file>
 9 |     </welcome-file-list>
10 | 
11 | </web-app>


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