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();*/
    }
}