├── ChatSystemClient.java
├── ChatSystemServer.java
└── README.md


/ChatSystemClient.java:
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 1 | 
 2 | import java.io.*;
 3 | import java.net.InetAddress;
 4 | import java.net.Socket;
 5 | 
 6 | public class ChatSystemClient {
 7 |     public static void main(String[] args) throws IOException {
 8 | 
 9 |         InetAddress addressOfTheServer = InetAddress.getByName("127.0.0.1");
10 | 
11 |         // Connecting to the server
12 |         Socket client = new Socket(addressOfTheServer, 3000);
13 | 
14 | 
15 |         // Getting the server input/output streams
16 |         BufferedReader inputFromServer = new BufferedReader(new InputStreamReader(client.getInputStream()));
17 |         PrintWriter outputStream = new PrintWriter(new OutputStreamWriter(client.getOutputStream()));
18 | 
19 |         // Getting the keyboard input stream
20 |         BufferedReader keyboardInput = new BufferedReader(new InputStreamReader(System.in));
21 | 
22 |         Thread messagePrinter = new Thread(new Runnable() {
23 |             @Override
24 |             public void run() {
25 |                 while(true) {
26 |                     try {
27 |                         String messageFromServer = inputFromServer.readLine();
28 |                         if(messageFromServer != null) {
29 |                             System.out.println("Message from the server: " + messageFromServer);
30 |                         }
31 |                     } catch (IOException e) {
32 |                         e.printStackTrace();
33 |                     }
34 | 
35 |                 }
36 |             }
37 |         });
38 | 
39 |         // Start the message printer Thread
40 |         messagePrinter.start();
41 | 
42 |         while(true) {
43 | 
44 |             // Reading message from the keyboard
45 |             String line = keyboardInput.readLine();
46 | 
47 |             // Sending the message to the server
48 |             outputStream.println(line);
49 |             outputStream.flush();
50 | 
51 |         }
52 | 
53 |     }
54 | }
55 | 


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/ChatSystemServer.java:
--------------------------------------------------------------------------------
  1 | 
  2 | import java.io.*;
  3 | import java.net.InetAddress;
  4 | import java.net.ServerSocket;
  5 | import java.net.Socket;
  6 | 
  7 | 
  8 | public class ChatSystemServer {
  9 | 
 10 |     public static void main(String[] args) throws IOException, InterruptedException {
 11 | 
 12 |         InetAddress address = InetAddress.getByName("localhost");
 13 |         ServerSocket server = new ServerSocket(3000,3, address);
 14 | 
 15 |         while(true) {
 16 | 
 17 |             Socket newClient = server.accept();
 18 | 
 19 |             ChatServerWorker serverWorker = new ChatServerWorker(newClient);
 20 |             serverWorker.start();
 21 | 
 22 |         }
 23 |     }
 24 | }
 25 | 
 26 | class ChatServerWorker extends Thread {
 27 | 
 28 |     private Socket clientSocket;
 29 | 
 30 |     public ChatServerWorker(Socket clientSocket) {
 31 |         this.clientSocket = clientSocket;
 32 |     }
 33 | 
 34 |     @Override
 35 |     public void run() {
 36 |         try {
 37 |             startWorker();
 38 |         } catch (IOException e) {
 39 |             e.printStackTrace();
 40 |         }
 41 |     }
 42 | 
 43 |     void startWorker() throws IOException {
 44 | 
 45 | 
 46 |         // Getting the input/output streams of the client
 47 |         BufferedReader clientInput = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
 48 |         PrintWriter clientOutput = new PrintWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
 49 | 
 50 |         // Getting the keyboard input stream
 51 |         BufferedReader keyboardInput = new BufferedReader(new InputStreamReader(System.in));
 52 | 
 53 | 
 54 |         Thread messagePrinter = new Thread(new Runnable() {
 55 |             @Override
 56 |             public void run() {
 57 |                 while(true) {
 58 |                     if(clientSocket.isClosed()) {
 59 |                         Thread.interrupted();
 60 |                         break;
 61 |                     }
 62 |                     try {
 63 |                         if(clientInput == null) {
 64 |                             break;
 65 |                         }
 66 | 
 67 |                         String messageFromTheClient = clientInput.readLine();
 68 |                         if(messageFromTheClient != null) {
 69 |                             System.out.println("Message from the client: " + messageFromTheClient);
 70 |                         }
 71 | 
 72 |                         if(messageFromTheClient.equals("exit")) {
 73 |                             clientSocket.close();
 74 |                             break;
 75 |                         }
 76 | 
 77 |                     } catch (IOException e) {
 78 |                         e.printStackTrace();
 79 |                     }
 80 | 
 81 |                 }
 82 |             }
 83 |         });
 84 | 
 85 |         // Starting the message printer on a new Thread
 86 |         messagePrinter.start();
 87 | 
 88 |         while(true) {
 89 |             if(clientSocket.isClosed()) {
 90 |                 break;
 91 |             }
 92 |             String messageBack = keyboardInput.readLine();
 93 | 
 94 |             if(messageBack.equals("exit")) {
 95 |                 Thread.interrupted();
 96 |             }
 97 |             clientOutput.println(messageBack);
 98 |             clientOutput.flush();
 99 | 
100 |         }
101 | 
102 |         clientSocket.close();
103 | 
104 |     }
105 | 
106 | }
107 | 


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/README.md:
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1 | # ChatSystem-Java
2 | Java chat system. <br>
3 | Here's the code from the client and server side.
4 | 
5 | 


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