SpringAnnotation注解之@PreDestroy，@PostConstruct，@Scope

@Scope的使用很简单，直接在类上加上就行

@PostConstruct：相当于xml配置方式的init-method方法

@PreDestroy：相当于xml配置方式的destroy-method方法

例如：userService

package com.fz.annotation.service;

import javax.annotation.PostConstruct;

import javax.annotation.PreDestroy;

import javax.annotation.Resource;

import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Component;

import com.fz.annotation.dao.UserDao;

import com.fz.xml.entity.User;

@Service("userService")

@Scope("prototype")

public class UserService {

private UserDao userDao;

public void userAdd(){

User user = new User();

user.setUsername("zhangsan");

user.setPassword("zhangsan");

userDao.userAdd(user);

}

public UserDao getUserDao() {

return userDao;

}

@Resource(name="userDaoImpl")

public void setUserDao(UserDao userDao) {

this.userDao = userDao;

}

@PostConstruct

public void init(){

System.out.println("init...");

}

@PreDestroy

public void destroy(){

System.out.println("destroy...");

}

applicationContext.xml配置很简单：

<?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"

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

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<context:annotation-config/>

<context:component-scan base-package="com.fz.annotation"></context:component-scan>

</beans>

测试代码：

@Test

public void getProperties(){

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

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

UserService userService1 = (UserService) ctx.getBean("userService");

userService.userAdd();

System.out.println(userService == userService1);

ctx.destroy();

}

结果如下：

可以看出init还是执行了两次，两个对象也不是同一个对象，但是destroy同样还是不执行了。。。。

来自为知笔记(Wiz)

巴特西

SpringAnnotation注解之@PreDestroy，@PostConstruct，@Scope

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