spring in action 学习笔记四：bean的生命周期

　bean 的生命周期分为：一个是ApplicationContext的容器的bean的生命周期，另一个是BeanFactory容器的生命周期。

首先介绍一下：ApplicationContext的容器的bean的生命周期：

一共13步步骤如下：

Instaniate--->Populate properties--->BeanNameAware's  setBeanName--->BeanFactoryAware's setBeanFactory-->ApplicationContextAware's setApplicationContext-->pre-Initialization BeanPostProcessor --->InitializingBean's afterPropertiesSet--->call custom init-method-->post-Initialization BeanPostProcessor-->bean is ready to use-->container is shutdown-->DisposableBean's destory-->call custom destory-method.

上述文字的图如下所示：

其次介绍一下：BeanFactory的bean的生命周期，它的生命周期只是比ApplicationContext的bean的生命周期少了三步：一步是：ApplicationContextAware,另外两步是：

BeanPostProcessor的两步。如下图所示：

代码的目录结构如下：

beans.xml的代码如下：

<?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:aop="http://www.springframework.org/schema/aop"

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

       http://www.springframework.org/schema/aop/spring-aop.xsd

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

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

   <bean id="studentService" class="com.qls.beanlife2.StudentService" >

       <property name="name" value="熊二"/>

   </bean>

    <bean id="myBeanPostProcessor" class="com.qls.beanlife2.MyBeanPostProcessor"/>

</beans>

StudentService的代码如下：

 package com.qls.beanlife2;

 import org.springframework.beans.BeansException;

 import org.springframework.beans.factory.*;

 import org.springframework.context.ApplicationContext;

 import org.springframework.context.ApplicationContextAware;

 /**

  * Created by ${秦林森} on 2017/6/6.

  */

 public class StudentService implements BeanNameAware ,BeanFactoryAware,ApplicationContextAware,InitializingBean,DisposableBean{

     private String name;

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

         System.out.println("2.Populate Properties");

     }

     public StudentService() {

         System.out.println("1.Instantiate");

     }

     @Override

     public void setBeanName(String name) {

         System.out.println("3.BeanNameAware's setBeanName    the bean name is :"+name);

     }

     @Override

     public void setBeanFactory(BeanFactory beanFactory) throws BeansException {

         System.out.println("4.BeanFactoryAware's setBeanFactory   the bean factory name is: "+beanFactory);

     }

     @Override

     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException{

         System.out.println("5.ApplicationContextAware's setApplicationContext the applicationContext is: "+applicationContext);

     }

     @Override

     public void afterPropertiesSet() throws Exception {

         System.out.println("7.InitializingBean's afterPropertiesSet ");

     }

     public void hello(){

         System.out.println("hello");

     }

     @Override

     public void destroy() throws Exception {

         System.out.println("destroy");

     }

     public void myDestroy(){

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

     }

 }

MyBeanPostProcessor的代码如下：

package com.qls.beanlife2;

import org.springframework.beans.BeansException;

import org.springframework.beans.factory.config.BeanPostProcessor;

/**

 * Created by ${秦林森} on 2017/6/6.

 */

public class MyBeanPostProcessor implements BeanPostProcessor {

    @Override

    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {

        System.out.println("6.pre-initialization BeanPostProcessor");

        return beanName;

    }

    @Override

    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {

        return beanName;

    }

}

StudentTest的代码如下：

package com.qls.beanlife2;

import org.springframework.beans.factory.xml.XmlBeanFactory;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.springframework.core.io.ClassPathResource;

/**

 * Created by ${秦林森} on 2017/6/6.

 */

public class StudentTest {

    public static void main(String[] args) {

        ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("com/qls/beanlife2/beans.xml");//这个是测试ApplicationContext的bean的生命周期

       /*
、//这个是测试BeanFactory的bean的生命周期。
 XmlBeanFactory factory = new XmlBeanFactory(new ClassPathResource("com/qls/beanlife2/beans.xml"));

        StudentService studentService= (StudentService) factory.getBean("studentService");

        studentService.hello();*/

    }

}