深入理解Spring中bean的生命周期

[Spring中bean的生命周期]

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

 1 public class Person implements BeanNameAware ,BeanFactoryAware{
 2     
 3     private String name;
 4     
 5     public Person(){
 6         System.out.println("调用构造器为属性值初始化");
 7     }
 8 
 9     public String getName() {
10         return name;
11     }
12 
13     public void setName(String name) {
14         this.name = name;
15     }
16 
17     @Override
18     public void setBeanName(String arg0) {
19         // TODO Auto-generated method stub
20         System.out.println("获取beanName id值"+"  "+arg0);
21         
22     }
23 
24     @Override
25     public void setBeanFactory(BeanFactory arg0) throws BeansException {
26         // TODO Auto-generated method stub
27         System.out.println("获取BeanFactory" +"  "+arg0);
28         
29     }
30     
31 
32 }

 1 public class MyBeanPostProcessor  implements BeanPostProcessor{
 2 
 3     @Override
 4     public Object postProcessAfterInitialization(Object arg0, String arg1) throws BeansException {
 5         // TODO Auto-generated method stub
 6         System.out.println("调用postProcessAfterInitialization");
 7         return arg0;
 8     }
 9 
10     @Override
11     public Object postProcessBeforeInitialization(Object arg0, String arg1) throws BeansException {
12         // TODO Auto-generated method stub
13         System.out.println("调用postProcessBeforeInitialization");
14         return arg0;
15     }
16 
17 }

ApplicationContext.xml配置文件:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
 5 <!-- bean的配置文件 -->
 6 <bean id="person" class="org.jingdong.bean.life.Person">
 7 <property name="name" value="grl"></property>
 8 </bean>
 9 
10 <bean id="myBeanPostProcessor" class="org.jingdong.bean.life.MyBeanPostProcessor"></bean>
11 </beans>

Main.java

 1 public class Main {
 2     public static void main(String[] args) {
 3         // 创建IOC容器
 4         ApplicationContext ac = new ClassPathXmlApplicationContext("org/jingdong/bean/life/applicationContext.xml");
 5         //从容器中获取bean实例
 6         Person person = (Person) ac.getBean("person");
 7         //使用bean
 8         System.out.println(person.getName());
 9     }
10 }

2.以Spring Factory装配bean为例：

　　（1）.生命周期图：