<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

  <bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl">

  </bean>

  <bean id="userService" class="com.bjsxt.service.UserService" init-method="init" destroy-method="destroy" scope="prototype">

  	<!--

  	<property name="userDAO" ref="u" />

  	 -->

  	 <constructor-arg>

  	 	<ref bean="u"/>

  	 </constructor-arg>

  </bean>

</beans>

package com.bjsxt.service;

import com.bjsxt.dao.UserDAO;

import com.bjsxt.model.User;

public class UserService {

	private UserDAO userDAO;  

	public void init() {

		System.out.println("init");

	}

	public void add(User user) {

		userDAO.save(user);

	}

	public UserDAO getUserDAO() {

		return userDAO;

	}

	public void setUserDAO(UserDAO userDAO) {

		this.userDAO = userDAO;

	}

	public UserService(UserDAO userDAO) {

		super();

		this.userDAO = userDAO;

	}

	public void destroy() {

		System.out.println("destroy");

	}

}

package com.bjsxt.service;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.model.User;

//Dependency Injection

//Inverse of Control

public class UserServiceTest {

	@Test

	public void testAdd() throws Exception {

		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

		UserService service = (UserService)ctx.getBean("userService");

		UserService service2 = (UserService)ctx.getBean("userService");

		ctx.destroy();

	}

}