深入理解Spring中bean的生命周期

[Spring中bean的生命周期]

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bean的生命周期

1.以ApplocationContext上下文单例模式装配bean为例，深入探讨bean的生命周期：

　（1）.生命周期图：

　　（2）.具体事例：

　　person类实现BeanNameAware,BeanFactoryAware接口

 public class Person implements BeanNameAware ,BeanFactoryAware{

     private String name;

     public Person(){
         System.out.println("调用构造器为属性值初始化");
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     @Override
     public void setBeanName(String arg0) {
         // TODO Auto-generated method stub
         System.out.println("获取beanName id值"+"  "+arg0);

     }

     @Override
     public void setBeanFactory(BeanFactory arg0) throws BeansException {
         // TODO Auto-generated method stub
         System.out.println("获取BeanFactory" +"  "+arg0);

     }

 }

 public class MyBeanPostProcessor  implements BeanPostProcessor{

     @Override
     public Object postProcessAfterInitialization(Object arg0, String arg1) throws BeansException {
         // TODO Auto-generated method stub
         System.out.println("调用postProcessAfterInitialization");
         return arg0;
     }

     @Override
     public Object postProcessBeforeInitialization(Object arg0, String arg1) throws BeansException {
         // TODO Auto-generated method stub
         System.out.println("调用postProcessBeforeInitialization");
         return arg0;
     }

 }

ApplicationContext.xml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"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
 <!-- bean的配置文件 -->
 <bean id="person" class="org.jingdong.bean.life.Person">
 <property name="name" value="grl"></property>
 </bean>

 <bean id="myBeanPostProcessor" class="org.jingdong.bean.life.MyBeanPostProcessor"></bean>
 </beans>

Main.java

 public class Main {
     public static void main(String[] args) {
         // 创建IOC容器
         ApplicationContext ac = new ClassPathXmlApplicationContext("org/jingdong/bean/life/applicationContext.xml");
         //从容器中获取bean实例
         Person person = (Person) ac.getBean("person");
         //使用bean
         System.out.println(person.getName());
     }
 }

　

2.以Spring Factory装配bean为例：

　　（1）.生命周期图：