spring生命周期

Spring的生命周期.

 

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