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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

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：

1 2 3 4 5 6 7 8 9 10 11 12

<?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：

1 2 3 4 5 6 7 8 9

@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)