通过Spring @PostConstruct 和 @PreDestroy 方法 实现初始化和销毁bean之前进行的操作

关于在spring 容器初始化 bean 和销毁前所做的操作定义方式有三种：
第一种：[color=red][b]通过@PostConstruct 和 @PreDestroy 方法 实现初始化和销毁bean之前进行的操作[/b][/color]
第二种是：[color=red][b]通过 在xml中定义init-method 和 destory-method方法[/b][/color]
第三种是：[color=red][b]通过bean实现InitializingBean和 DisposableBean接口[/b][/color]

下面演示通过 @PostConstruct 和 @PreDestory
1:定义相关的实现类：

package com.myapp.core.annotation.init;  

import javax.annotation.PostConstruct;  
import javax.annotation.PreDestroy;  

public class PersonService {  

    private String  message;  

    public String getMessage() {  
        return message;  
    }  

    public void setMessage(String message) {  
        this.message = message;  
    }  

    @PostConstruct  
    public void  init(){  
        System.out.println("I'm  init  method  using  @PostConstrut...."+message);  
    }  

    @PreDestroy  
    public void  dostory(){  
        System.out.println("I'm  destory method  using  @PreDestroy....."+message);  
    }  

}  

2：定义相关的配置文件：

<?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"  
xsi:schemaLocation="http://www.springframework.org/schema/beans  
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
http://www.springframework.org/schema/context  
http://www.springframework.org/schema/context/spring-context-3.1.xsd">  

<context:annotation-config />  

<bean id="personService" class="com.myapp.core.annotation.init.PersonService">  
  <property name="message" value="123"></property>  
</bean>  

</beans>  

其中<context:annotation-config />告诉spring 容器采用注解配置：扫描注解配置
[size=medium][color=red][b]测试类：[/b][/color][/size]

package com.myapp.core.annotation.init;  

import org.springframework.context.ApplicationContext;  
import org.springframework.context.support.ClassPathXmlApplicationContext;  

public class MainTest {  

    public static void main(String[] args) {  

        ApplicationContext  context = new ClassPathXmlApplicationContext("resource/annotation.xml");  

        PersonService   personService  =  (PersonService)context.getBean("personService");  

        personService.dostory();  
    }  

}  

其中也可以通过申明加载org.springframework.context.annotation.CommonAnnotationBeanPostProcessor
类来告诉Spring容器采用的 常用 注解配置的方式：
只需要修改配置文件为：

<?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-3.1.xsd  
http://www.springframework.org/schema/context  
http://www.springframework.org/schema/context/spring-context-3.1.xsd">  

<!-- <context:annotation-config /> -->  

<bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor" />  
<bean id="personService" class="com.myapp.core.annotation.init.PersonService">  
          <property name="message" value="123"></property>  
</bean>
</beans>  

[url]http://blog.youkuaiyun.com/topwqp/article/details/8681497[/url]

[size=medium][color=red][b]spring加载bean实例化顺序[/b][/color][/size]
[url]http://www.cnblogs.com/fanguangdexiaoyuer/p/5886050.html[/url]

Bean在实例化的过程中：
[size=large][color=violet][b]Constructor > @PostConstruct > InitializingBean > init-method[/b][/color][/size]
[url]http://sexycoding.iteye.com/blog/1046993[/url]

[size=large][color=violet][b]Spring中Bean初始化实例【重要】[/b][/color][/size]
[url]http://uule.iteye.com/blog/2094609[/url]