Spring Bean的生命周期

 面试的时候问到了这个问题，很长时间没接触spring了，回答的不好，

今天总结下：

实例化bean对象(通过构造方法或者工厂方法)
设置对象属性(setter等)（依赖注入）

如果Bean实现了BeanNameAware接口，工厂调用Bean的setBeanName()方法传递Bean的ID。（和下面的一条均属于检查Aware接口）
如果Bean实现了BeanFactoryAware接口，工厂调用setBeanFactory()方法传入工厂自身

调用Bean的初始化方法
使用Bean
容器关闭之前，调用Bean的销毁方法

spring的配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:p="http://www.springframework.org/schema/p" 
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee"
        xsi:schemaLocation="
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd">
            
            
        <bean id="user" class="org.pine.spring.dto.User" init-method="initUser" destroy-method="destoryUser">
           <property name="fullName" value="张泰松"/>
        </bean>    
            
</beans>

实体类User:

package org.pine.spring.dto;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanNameAware;

public class User implements BeanNameAware,BeanFactoryAware{

    private String fullName;

    public User() {
        System.out.println("调用构造方法进行实例化~~~");
    }

    public String getFullName() {
        return fullName;
    }

    public void setFullName(String fullName) {
        System.out.println("调用set方法设置属性值~~~");
        this.fullName = fullName;
    }

    @Override
    public String toString() {
        return "User [fullName=" + fullName + "]";
    }

    @Override
    public void setBeanName(String beanName) {
        System.out.println("设置beanName:"+beanName);
    }
    
    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
       System.out.println("设置beanFactory:"+beanFactory);         
    }

    public void initUser() {
        System.out.println("初始化方法~~~");
    }
    
    public void doSomething() {
        System.out.println("做一些事情~~~");
    }
    
    public void destoryUser() {
        System.out.println("销毁方法~~~");
    }
    
}

测试类：

package org.pine.spring.test;

import org.pine.spring.dto.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringTest {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        User user=    (User) context.getBean("user");
        user.doSomething();
        ((AbstractApplicationContext)context).close();
    }
}

测试结果如下：

调用构造方法进行实例化~~~
调用set方法设置属性值~~~
设置beanName:user
设置beanFactory:org.springframework.beans.factory.support.DefaultListableBeanFactory@449b2d27: defining beans [user]; root of factory hierarchy
初始化方法~~~
做一些事情~~~
销毁方法~~~

本文源代码在此处下载：SpringTest.zip