spring IOC源码解析

目录展示

UserDao接口

package com.hopu.dao;

public interface UserDao {
	public void save();

}

UserDaoImpl实现类

package com.hopu.dao.impl;

import java.util.List;
import java.util.Map;
import java.util.Properties;

import com.hopu.dao.UserDao;

public class UserDaoImpl implements UserDao {
	private int age;
	private List<String> strList;
	private Map<String,String> userMap;
	private Properties properties;
	
	public Properties getProperties() {
		return properties;
	}
	public void setProperties(Properties properties) {
		this.properties = properties;
	}
	public Map<String, String> getUserMap() {
		return userMap;
	}
	public void setUserMap(Map<String, String> userMap) {
		this.userMap = userMap;
	}
	public List<String> getStrList() {
		return strList;
	}
	public void setStrList(List<String> strList) {
		this.strList = strList;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}


	public void save() {
		System.out.println("用户保存了");
	}
	public void init() {
		//System.out.println("用户初始化了");
	}
	public void destroy() {
		//System.out.println("用户销毁了");
	}
	public UserDaoImpl() {
		super();
		System.out.println("对象创建了");
	}
	public UserDaoImpl(String name) {
		super();
		System.out.println("对象创建了");
	}
	
	@Override
	public String toString() {
		return "UserDaoImpl [age=" + age + ", strList=" + strList + ", userMap=" + userMap + ", properties="
				+ properties + "]";
	}
	
	
}

DynamicFactoryBean类

package com.hopu.factory;

import com.hopu.dao.UserDao;
import com.hopu.dao.impl.UserDaoImpl;

public class DynamicFactoryBean {
	public UserDao createUserDao(){        
        return new UserDaoImpl(); 
    }
}

StaticFactoryBean类

package com.hopu.factory;

import com.hopu.dao.UserDao;
import com.hopu.dao.impl.UserDaoImpl;

public class StaticFactoryBean {
	public static UserDao createUserDao(){    
	    return new UserDaoImpl();
	}
}

UserService接口

package com.hopu.service;

public interface UserService {
	public void save();

}

UserServiceImpl实现类

package com.hopu.service.impl;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.hopu.dao.UserDao;
import com.hopu.service.UserService;

public class UserServiceImpl implements UserService {
	private UserDao userDao;
	
	//通过set方法注入userDao
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	
	//通过有参的构造方法来注入userDao
	/*public UserServiceImpl(UserDao userDao) {
		super();
		this.userDao = userDao;
	}*/
	
	//直接内部获取userDao
	/*public void save() {
         ApplicationContext applicationContext = new 
                 ClassPathXmlApplicationContext("applicationContext.xml");                     
         UserDao userDao = (UserDao) applicationContext.getBean("userDao");   
         userDao.save();
    }*/
	
	public void save() {
		userDao.save();
	}
	
}

applicationContext-userDao.xml

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="
    http://www.springframework.org/schema/beans                      
    http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 使用无参构造方法实例化 -->
	<bean id="userDao" class="com.hopu.dao.impl.UserDaoImpl" init-method="init" destroy-method="destroy">
		<property name="age" value="18"></property>
		<property name="strList">
			<list>
				<value>aaa</value>
				<value>bbb</value>
				<value>ccc</value>
			</list>
		</property>
		<property name="userMap">
			<map>
				<entry key="1" value="张三"/>
				<entry key="2" value="李四"/>
			</map>
		</property>
		<property name="properties">
			<props>
				<prop key="1">aaa</prop>
				<prop key="2">bbb</prop>
				<prop key="3">ccc</prop>
			</props>
		</property>
	</bean>
	
</beans>

applicationContext.xml

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="
    http://www.springframework.org/schema/beans                      
    http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 使用无参构造方法实例化 -->
	<!-- <bean id="userDao" class="com.hopu.dao.impl.UserDaoImpl" init-method="init" destroy-method="destroy">
		<property name="age" value="18"></property>
		<property name="strList">
			<list>
				<value>aaa</value>
				<value>bbb</value>
				<value>ccc</value>
			</list>
		</property>
		<property name="userMap">
			<map>
				<entry key="1" value="张三"/>
				<entry key="2" value="李四"/>
			</map>
		</property>
		<property name="properties">
			<props>
				<prop key="1">aaa</prop>
				<prop key="2">bbb</prop>
				<prop key="3">ccc</prop>
			</props>
		</property>
	</bean> -->
	
	<!-- 工厂静态方法实例化 -->
	<!-- <bean id="staticFactoryBean" class="com.hopu.factory.StaticFactoryBean" factory-method="createUserDao" /> -->
	
	<!-- 工厂实例方法实例化 -->
	<!-- <bean id="factoryBean" class="com.hopu.factory.DynamicFactoryBean"/>
	<bean id="userDao" factory-bean="factoryBean" factory-method="createUserDao"/> -->
	
<!-- Bean的依赖注入（引用类型） -->
	<!-- 通过有参构造方法注入userDao到userService -->
	<!-- <bean id="userService" class="com.hopu.service.impl.UserServiceImpl">                
		<constructor-arg name="userDao" ref="userDao"></constructor-arg>
	</bean> -->
	
	<!-- 通过set方法注入userDao到userService -->
	<!-- <bean id="userService" class="com.hopu.service.impl.UserServiceImpl">                
		<property name="userDao" ref="userDao"></property>
	</bean> -->
	
	<!-- 通过P命名空间注入userDao到userService -->
	<bean id="userService" class="com.hopu.service.impl.UserServiceImpl" p:userDao-ref="userDao"/>                
	
<!-- Bean的依赖注入（其他类型） -->	
	
<import resource="applicationContext-userDao.xml"/>	
</beans>

testIoc测试类

package ioc;

import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.hopu.dao.UserDao;

public class TestIoc {
	@Test
	public void testIoc(){
		ClassPathXmlApplicationContext applicationContext = 
				new ClassPathXmlApplicationContext("applicationContext.xml");
		UserDao userDao = (UserDao) applicationContext.getBean("userDao");                  
		System.out.println(userDao);
	    applicationContext.close();
	}
}