Spring初始化Bean的过程-白红宇

最近打算写一个spring-mvc的插件，便于做接口测试，既然是插件，那就是零耦合。知道spring有几个接口，BeanPostProcessor, InitializingBean, DisposableBean, ApplicationContextAware, BeanFactoryPostProcessor，这几个接口也涉及到bean的生命周期。

贴代码：

调用类：

public interface Person {

void eatMeat();

}

public class Student implements Person {

private Fork fork;

public Student() {

System.out.println("Student.Constructor");

}

public Fork getFork() {

return fork;

}

public void setFork(Fork fork) {

this.fork = fork;

System.out.println("Student.setFork");

}

public void eatMeat() {

this.fork.forkMeat();

System.out.println("Student.eatMeat");

}

public void init() {

System.out.println("Student.init");

}

被依赖的类：

public interface Fork {

void forkMeat();

}

public class WoodFork implements Fork {

String name;

public String getName() {

return name;

}

public void setName(String name) {

System.out.println("WoodFork.setName");

this.name = name;

}

public WoodFork() {

System.out.println("WoodFork.Constructor");

}

@Override

public void forkMeat() {

System.out.println("WoodFork.forkMeat");

}

bean的几个接口实现类：

import org.springframework.beans.BeansException;

import org.springframework.beans.factory.DisposableBean;

import org.springframework.beans.factory.InitializingBean;

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

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

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

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationContextAware;

public class MyBeanPostProcessor implements BeanPostProcessor, InitializingBean, DisposableBean, ApplicationContextAware, BeanFactoryPostProcessor {

public String name;

public void setName(String name) {

this.name = name;

System.out.println("MyBeanPostProcessor.setName");

}

public MyBeanPostProcessor() {

System.out.println("MyBeanPostProcessor.Constructor");

}

public void setApplicationContext(ApplicationContext applicationContext)

throws BeansException {

System.out.println("MyBeanPostProcessor.setApplicationContext");

}

public Object postProcessBeforeInitialization(Object bean, String beanName)

throws BeansException {

System.out.println("MyBeanPostProcessor.postProcessBeforeInitialization for " + bean.getClass().getSimpleName());

return bean;

}

public Object postProcessAfterInitialization(Object bean, String beanName)

throws BeansException {

System.out.println("MyBeanPostProcessor.postProcessAfterInitialization for " + bean.getClass().getSimpleName());

return bean;

}

public void destroy() throws Exception {

System.out.println("MyBeanPostProcessor.destory");

}

public void afterPropertiesSet() throws Exception {

System.out.println("MyBeanPostProcessor.afterPropertiesSet");

}

@Override

public void postProcessBeanFactory(

ConfigurableListableBeanFactory beanFactory) throws BeansException {

System.out.println("MyBeanPostProcessor.postProcessBeanFactory");

}

spring配置：

<?xml version="1.0" encoding="utf-8"?>

<beans xmlns="" xmlns:xsi=""

xmlns:p="" xmlns:context=""

xmlns:mvc=""

xsi:schemaLocation=" " >

<bean id="woodFork" class="com.kaige.spring.WoodFork" >

<property name="name" value="wood"></property>

</bean>

<bean id="student" class="com.kaige.spring.Student" init-method="init">

<property name="fork" ref="woodFork"></property>

</bean>

<bean class="com.kaige.spring.MyBeanPostProcessor">

<property name="name" value="processor"></property>

</bean>

</beans>

测试：

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {

public static void main(String[] args) {

ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("spring.xml");

Student s = (Student)ctx.getBean("student");

s.eatMeat();

ctx.registerShutdownHook();

System.out.println("end");

}

结果：

MyBeanPostProcessor.Constructor

MyBeanPostProcessor.setName

MyBeanPostProcessor.setApplicationContext

MyBeanPostProcessor.afterPropertiesSet

MyBeanPostProcessor.postProcessBeanFactory

WoodFork.Constructor

WoodFork.setName

MyBeanPostProcessor.postProcessBeforeInitialization for WoodFork

MyBeanPostProcessor.postProcessAfterInitialization for WoodFork

Student.Constructor

Student.setFork

MyBeanPostProcessor.postProcessBeforeInitialization for Student

Student.init

MyBeanPostProcessor.postProcessAfterInitialization for Student

WoodFork.forkMeat

Student.eatMeat

end

MyBeanPostProcessor.destory