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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:通过@PostConstruct 和 @PreDestroy 方法 实现初始化和销毁bean之前进行的操作
第二种是:通过 在xml中定义init-method 和 destory-method方法
第三种是: 通过bean实现InitializingBean和 DisposableBean接口

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:


[b]I'm init method using @PostConstrut....123

I'm destory method using @PreDestroy.....123[/b]



其中也可以通过申明加载[color=darkblue]org.springframework.context.annotation.CommonAnnotationBeanPostProcessor[/color]


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。


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