深入理解Spring中bean的生命周期介绍

2019-11-26 12:45:06

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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：