spring配置bean的生命周期

配置文件：

<?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:context="http://www.springframework.org/schema/context"

xmlns:tx="http://www.springframework.org/schema/tx"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd

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

default-lazy-init="false">

<!-- default-lazy-init用于指定所有的单例对象默认初始化的时机，默认为false -->

<!-- scope属性用于指定bean的生命周期，

singleton表示单例，每次ac.getBean()返回的都是同一个对象，

prototype表示原型/多例，每次ac.getBean()都会生成新的对象，

默认为单例 -->

<!-- lazy-init属性表示什么时候开始创建单例对象，只对单例有效，

true表示在需要创建对象的时候才开始创建，

false表示在容器启动的时候就开始创建对象,

默认与default-lazy-init的值一样 -->

<bean id="user1" class="com.colorlight.springscope.User" scope="singleton"

lazy-init="true">

<property name="id" value="1"></property>

<property name="name" value="lijun"></property>

<property name="password" value="199192"></property>

</bean>

<bean id="user2" class="com.colorlight.springscope.User" scope="prototype">

<property name="id" value="1"></property>

<property name="name" value="lijun"></property>

<property name="password" value="199192"></property>

</bean>

</beans>

User类：

package com.colorlight.springscope;

public class User {

private int id;

private String name;

private String password;

public User(){

System.out.println("创建了User的实例!");

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

}

测试类：

package com.colorlight.springscope;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainTest {

ApplicationContext ac = new ClassPathXmlApplicationContext(

"applicationContext.xml", this.getClass());

// 单例

@Test

public void test1() {

System.out.println("在getBean()调用之前");

User user1 = (User) ac.getBean("user1");

User user2 = (User) ac.getBean("user1");

System.out.println(user1 != null);

System.out.println(user1 == user2);

}

// 多例

@Test

public void test2() {

System.out.println("在getBean()调用之前");

User user1 = (User) ac.getBean("user2");

User user2 = (User) ac.getBean("user2");

System.out.println(user1 != null);

System.out.println(user1 == user2);

}

}