关于在  容器初始化 bean 和销毁前所做的操作定义方式有三种：

第二种是：

第三种是：

 

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:component-scan  base-package="com.myapp.core.jsr330"/> -->

<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；

 

测试类：

 

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();
    }

}

测试结果：

 

I'm  init  method  using  @PostConstrut....123

I'm  destory method  using  @PreDestroy.....123

 

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:component-scan  base-package="com.myapp.core.jsr330"/> -->

<!-- <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>

同样可以得到以上测试的输出结果。