初学spring init-method="init" destroy-method="destroy" scope="prototype"

beans.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"
       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>

UserServiceTest.java

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();

    }
}

当加了scope=”prototype”，前面两个方法就没用了，测试的结果是，运行new ClassPathXmlApplicationContext(“beans.xml”)不会初始化，而在调用getBean方法时，有两次调用，就两次初始化调用了init方法，最后没有调用销毁，如果去掉scope=”prototype”，new ClassPathXmlApplicationContext(“beans.xml”)就会初始化，只有一次，最后结束会调用销毁方法。所以前面两个不要和第三个一起用