├── README.md ├── pom.xml └── src ├── main └── java │ └── com │ └── springstudy │ └── simplespring │ ├── BeanDefinition.java │ ├── BeanDefinitionHolder.java │ ├── BeanFactory.java │ ├── PropertyValue.java │ └── PropertyValues.java └── test └── java └── com └── springstudy └── simplespring ├── HelloWorld.java └── TestIoC.java /README.md: -------------------------------------------------------------------------------- 1 | # Simple Spring 2 | A simple Spring framwork. 3 | 4 | ## Feature 5 | **IoC Feature:** 6 | * [Basic bean](https://github.com/Yikun/simple-spring/blob/master/src/test/java/com/springstudy/simplespring/TestIoC.java#L12) 7 | * [Bean with property](https://github.com/Yikun/simple-spring/blob/master/src/test/java/com/springstudy/simplespring/TestIoC.java#L29) 8 | 9 | ## Download 10 | ```bash 11 | git clone https://github.com/Yikun/simple-spring.git 12 | ``` 13 | 14 | ## Test 15 | ```bash 16 | mvn test 17 | ``` 18 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 3 | 4.0.0 4 | 5 | com.springstudy 6 | simple-spring 7 | 0.0.1-SNAPSHOT 8 | jar 9 | 10 | simple-spring 11 | http://maven.apache.org 12 | 13 | 14 | UTF-8 15 | 16 | 17 | 18 | 19 | junit 20 | junit 21 | 4.7 22 | test 23 | 24 | 25 | 26 | 27 | 28 | 29 | org.apache.maven.plugins 30 | maven-compiler-plugin 31 | 3.1 32 | 33 | 1.6 34 | 1.6 35 | UTF-8 36 | 37 | 38 | 39 | 40 | 41 | -------------------------------------------------------------------------------- /src/main/java/com/springstudy/simplespring/BeanDefinition.java: -------------------------------------------------------------------------------- 1 | package com.springstudy.simplespring; 2 | 3 | public class BeanDefinition { 4 | private Class beanClass; 5 | private String beanClassName; 6 | private PropertyValues propertyValues; 7 | 8 | public Class getBeanClass() { 9 | return beanClass; 10 | } 11 | 12 | public String getBeanClassName() { 13 | return beanClassName; 14 | } 15 | 16 | public void setBeanClassName(String beanClassName) { 17 | this.beanClassName = beanClassName; 18 | // 根据类名设置类 19 | try { 20 | this.beanClass = Class.forName(beanClassName); 21 | } catch (ClassNotFoundException e) { 22 | e.printStackTrace(); 23 | } 24 | } 25 | 26 | public PropertyValues getPropertyValues() { 27 | return propertyValues; 28 | } 29 | 30 | public void setPropertyValues(PropertyValues pvs) { 31 | this.propertyValues = pvs; 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /src/main/java/com/springstudy/simplespring/BeanDefinitionHolder.java: -------------------------------------------------------------------------------- 1 | package com.springstudy.simplespring; 2 | 3 | public class BeanDefinitionHolder { 4 | private final BeanDefinition beanDefinition; 5 | private final String beanName; 6 | 7 | public BeanDefinitionHolder(String beanName, BeanDefinition beanDefinition) { 8 | this.beanName = beanName; 9 | this.beanDefinition = beanDefinition; 10 | } 11 | 12 | public BeanDefinition getBeanDefinition() { 13 | return this.beanDefinition; 14 | } 15 | 16 | public String getBeanName() { 17 | return this.beanName; 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /src/main/java/com/springstudy/simplespring/BeanFactory.java: -------------------------------------------------------------------------------- 1 | package com.springstudy.simplespring; 2 | 3 | import java.lang.reflect.Field; 4 | import java.util.Map; 5 | import java.util.concurrent.ConcurrentHashMap; 6 | 7 | public class BeanFactory { 8 | // 用于存储bean的单例实体 9 | private final Map singletonObjects = new ConcurrentHashMap(64); 10 | // 用于存储beanDefinition 11 | private final Map beanDefinitionMap = new ConcurrentHashMap(); 12 | 13 | // 注册BeanDefinition 14 | public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition) { 15 | beanDefinitionMap.put(beanName, beanDefinition); 16 | } 17 | 18 | // 获取bean，如果不存在则创建 19 | public Object getBean(String beanName) { 20 | Object bean = getSingleton(beanName); 21 | if(bean == null) { 22 | try { 23 | bean = doCreateBean(beanName, beanDefinitionMap.get(beanName)); 24 | } catch (Exception e) { 25 | // TODO Auto-generated catch block 26 | e.printStackTrace(); 27 | } 28 | singletonObjects.put(beanName, bean); 29 | } 30 | return bean; 31 | } 32 | 33 | private Object getSingleton(String beanName) { 34 | return this.singletonObjects.get(beanName); 35 | } 36 | 37 | private Object doCreateBean(final String beanName, final BeanDefinition beanDefinition) throws Exception { 38 | Object bean = createBeanInstance(beanDefinition); 39 | applyPropertyValues(bean, beanDefinition); 40 | return bean; 41 | } 42 | 43 | private Object createBeanInstance(final BeanDefinition beanDefinition) throws Exception { 44 | Object bean; 45 | bean = beanDefinition.getBeanClass().newInstance(); 46 | return bean; 47 | } 48 | 49 | private void applyPropertyValues(Object bean, BeanDefinition beanDefinition) throws Exception{ 50 | PropertyValues pvs = beanDefinition.getPropertyValues(); 51 | if(pvs != null) { 52 | for(PropertyValue pv : pvs.getPropertyValueList()) { 53 | Field field = bean.getClass().getDeclaredField(pv.getName()); 54 | field.setAccessible(true); 55 | field.set(bean, pv.getValue()); 56 | } 57 | } 58 | } 59 | } 60 | -------------------------------------------------------------------------------- /src/main/java/com/springstudy/simplespring/PropertyValue.java: -------------------------------------------------------------------------------- 1 | package com.springstudy.simplespring; 2 | 3 | public class PropertyValue { 4 | private final String name; 5 | private final Object value; 6 | 7 | public PropertyValue(String name, Object value) { 8 | this.name = name; 9 | this.value = value; 10 | } 11 | 12 | public String getName() { 13 | return name; 14 | } 15 | 16 | public Object getValue() { 17 | return value; 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /src/main/java/com/springstudy/simplespring/PropertyValues.java: -------------------------------------------------------------------------------- 1 | package com.springstudy.simplespring; 2 | 3 | import java.util.ArrayList; 4 | import java.util.List; 5 | 6 | public class PropertyValues { 7 | private final List propertyValueList; 8 | 9 | public PropertyValues() { 10 | this.propertyValueList = new ArrayList(); 11 | } 12 | 13 | public void addPropertyValue(PropertyValue pv) { 14 | propertyValueList.add(pv); 15 | } 16 | 17 | public List getPropertyValueList() { 18 | return propertyValueList; 19 | } 20 | } 21 | -------------------------------------------------------------------------------- /src/test/java/com/springstudy/simplespring/HelloWorld.java: -------------------------------------------------------------------------------- 1 | package com.springstudy.simplespring; 2 | 3 | public class HelloWorld { 4 | private String msg = "Hello World!"; 5 | 6 | public String sayHello() { 7 | return msg; 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /src/test/java/com/springstudy/simplespring/TestIoC.java: -------------------------------------------------------------------------------- 1 | package com.springstudy.simplespring; 2 | 3 | import static org.junit.Assert.assertEquals; 4 | 5 | import org.junit.Test; 6 | 7 | import com.springstudy.simplespring.BeanDefinitionHolder; 8 | import com.springstudy.simplespring.BeanFactory; 9 | 10 | public class TestIoC { 11 | @Test 12 | public void testIoC() { 13 | // 1. 创建beanFactory 14 | BeanFactory beanFactory = new BeanFactory(); 15 | 16 | // 2. 注册bean 17 | BeanDefinition bd = new BeanDefinition(); 18 | bd.setBeanClassName("com.springstudy.simplespring.HelloWorld"); 19 | 20 | BeanDefinitionHolder bdh = new BeanDefinitionHolder("helloWorld", bd); 21 | beanFactory.registerBeanDefinition(bdh.getBeanName(), bdh.getBeanDefinition()); 22 | 23 | // 3. 获取bean 24 | HelloWorld hello = (HelloWorld) beanFactory.getBean("helloWorld"); 25 | assertEquals("Hello World!", hello.sayHello()); 26 | } 27 | 28 | @Test 29 | public void testIoCProperty() { 30 | // 1. 创建beanFactory 31 | BeanFactory beanFactory = new BeanFactory(); 32 | 33 | // 2. 注册bean 34 | BeanDefinition bd = new BeanDefinition(); 35 | bd.setBeanClassName("com.springstudy.simplespring.HelloWorld"); 36 | 37 | // 注入Property 38 | PropertyValues pvs = new PropertyValues(); 39 | pvs.addPropertyValue(new PropertyValue("msg", "Hello IoC Property!")); 40 | bd.setPropertyValues(pvs); 41 | 42 | BeanDefinitionHolder bdh = new BeanDefinitionHolder("helloWorld", bd); 43 | beanFactory.registerBeanDefinition(bdh.getBeanName(), bdh.getBeanDefinition()); 44 | 45 | // 3. 获取bean 46 | HelloWorld hello = (HelloWorld) beanFactory.getBean("helloWorld"); 47 | assertEquals("Hello IoC Property!", hello.sayHello()); 48 | } 49 | } 50 | --------------------------------------------------------------------------------