Spring的生命周期

Spring的生命周期.

 转自:http://mislay.iteye.com/blog/364698

1.       容器启动，实例化所有实现了BeanFactoyPostProcessor接口的类。他会在任何普通Bean实例化之前加载.

2.       实例化剩下的Bean，对这些Bean进行依赖注入。

3.       如果Bean有实现BeanNameAware的接口那么对这些Bean进行调用

4.       如果Bean有实现BeanFactoryAware接口的那么对这些Bean进行调用

5.       如果Bean有实现ApplicationContextAware接口的那么对这些Bean进行调用

6.       如果配置有实现BeanPostProcessor的Bean，那么调用它的postProcessBeforeInitialization方法

7.       如果Bean有实现InitializingBean接口那么对这些Bean进行调用

8.       如果Bean配置有init属性，那么调用它属性中设置的方法

9.       如果配置有实现BeanPostProcessor的Bean，那么调用它的postProcessAfterInitialization方法

10.   Bean正常是使用

11.   调用DisposableBean接口的destory方法

12.   调用Bean定义的destory方法

 

如果从大体上区分值分只为四个阶段

1.       BeanFactoyPostProcessor实例化

2.       Bean实例化，然后通过某些BeanFactoyPostProcessor来进行依赖注入

3.       BeanPostProcessor的调用.Spring内置的BeanPostProcessor负责调用Bean实现的接口: BeanNameAware, BeanFactoryAware, ApplicationContextAware等等，等这些内置的BeanPostProcessor调用完后才会调用自己配置的BeanPostProcessor

4.       Bean销毁阶段

 

 

以上是自己总结的，没研究过源码，恐有误…作参考用

以下附上验证的代码：

 

package mislay;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

public class BeanFactoryPostProcessorTest implements BeanFactoryPostProcessor {

    @Override
    public void postProcessBeanFactory(
            ConfigurableListableBeanFactory beanFactory) throws BeansException {
        System.out.println("--------> begin BeanFactoryPostProcessorTest");
        String[] names = beanFactory.getBeanDefinitionNames();
        for (String name : names) {
            System.out.println("definition bean name:" + name);
        }
        System.out.println("<--------- end BeanFactoryPostProcessorTest");
    }

}

 

package mislay;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;

public class BeanPostProcessorTest implements BeanPostProcessor {


    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("call BeanPostProcessor interface postProcessAfterInitialization method; :" + beanName);
        return bean;
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("call BeanPostProcessor interface postProcessBeforeInitialization method ::" + beanName);
        if(bean instanceof BeanTest) {
            System.out.println("bean instanceof BeanTest");
        }
        return bean;
    }

}

 

package mislay;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class BeanTest implements InitializingBean, DisposableBean,BeanNameAware,BeanFactoryAware,ApplicationContextAware {

    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("call InitializingBean interface");

    }

    @Override
    public void destroy() throws Exception {
        // TODO Auto-generated method stub
        System.out.println("call DisposableBean interface");
    }

    public void _init() {
        System.out.println("call bean init method");
    }

    public void _destory() {
        System.out.println("call bean destory method");
    }

    public void setSomething(Object something) {
        System.out.println("DI call setSomething method");
    }

    public BeanTest() {
        System.out.println("BeanTest create");
    }

    @Override
    public void setBeanName(String name) {
        // TODO Auto-generated method stub
        System.out.println("call BeanNameAware interface name is:" + name);
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        // TODO Auto-generated method stub
        System.out.println("call BeanFactoryAware interface");
    }


    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        // TODO Auto-generated method stub
        System.out.println("call ApplicationContextAware interface");
    }

}

 

package mislay;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        ((AbstractApplicationContext) context).registerShutdownHook();
    }
}

 

//下面是输出的内容


//这一段可以看出首先实例化化的BeanFactoryPostProcessor
--------> begin BeanFactoryPostProcessorTest
definition bean name:mislay.BeanFactoryPostProcessorTest
definition bean name:mislay.BeanPostProcessorTest
definition bean name:beanTest
<--------- end BeanFactoryPostProcessorTest

//这一段是Bean的创建以及依赖注入
BeanTest create
DI call setSomething method

//这一段就是内置的BeanPostProcessor调用
call BeanNameAware interface name is:beanTest
call BeanFactoryAware interface
call ApplicationContextAware interface

//这里开始调用自己BeanPostProcessor
call BeanPostProcessor interface postProcessBeforeInitialization method ::beanTest
bean instanceof BeanTest
//穿插着对InitializingBean接口和定义的init方法的调用
call InitializingBean interface
call bean init method
call BeanPostProcessor interface postProcessAfterInitialization method; :beanTest
//上面就结束了对配置的BeanPostProcessor的调用


//最后销毁
call DisposableBean interface
call bean destory method