Spring的生命周期

1 实例化(当我们的程序加载beans.xml文件)，把我们的bean(前提是scope=singleton)实例化到内存

2 调用set方法设置属性

3 如果你实现了bean名字关注接口(BeanNameAware) 则，可以通过setBeanName获取id号

4 如果你实现了 bean工厂关注接口，(BeanFactoryAware),则可以获取BeanFactory

5 如果你实现了 ApplicationContextAware接口，则调用方法

//该方法传递ApplicationContext

public void setApplicationContext(ApplicationContext arg0)

throws BeansException {

// TODO Auto-generated method stub

System.out.println(“setApplicationContext”+arg0);

}

6 如果bean 和一个后置处理器关联,则会自动去调用 Object postProcessBeforeInitialization方法

7 如果你实现InitializingBean 接口，则会调用 afterPropertiesSet

8 如果自己在<bean init-method=”init” /> 则可以在bean定义自己的初始化方法.

9 如果bean 和一个后置处理器关联,则会自动去调用 Object postProcessAfterInitialization方法

10 使用我们的bean

11. 容器关闭

12. 可以通过实现DisposableBean 接口来调用方法 destory

13. 可以在<bean destory-method=”fun1”/> 调用定制的销毁方法

小结: 我们实际开发中往往，没有用的这么的过程,常见的是:

1->2->6->10->9->11

以下为验证代码：

PersonService.java

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package com.lpq.beanlife;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

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.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class PersonService implements BeanNameAware,BeanFactoryAware,ApplicationContextAware,InitializingBean,DisposableBean{
private String name;

public String getName() {
return name;
}

public void setName(String name) {
System.out.println("setName.........");
this.name = name;
}

public void sayHi(){
System.out.println("hi "+name);
}

//也可以通过注解的方式来配置哪个方法是init-method
@PostConstruct
public void init(){
System.out.println("init.........");
}
@PreDestroy
public void mydestroy(){
System.out.println("mydestroy..........");
}

public PersonService(){
System.out.println("PersonService......start");
}

//该方法可以给arg0表示正在被实例化的bean id
@Override
public void setBeanName(String arg0) {
// TODO Auto-generated method stub
System.out.println("setBeanName.....id:"+arg0);
}

//该方法可以传递beanfactory
@Override
public void setBeanFactory(BeanFactory arg0) throws BeansException {
// TODO Auto-generated method stub
System.out.println("setBeanFactory....."+arg0);
}

//该方法传递ApplicationContext
@Override
public void setApplicationContext(ApplicationContext arg0)
throws BeansException {
// TODO Auto-generated method stub
System.out.println("setApplicationContext.........."+arg0);
}

@Override
public void afterPropertiesSet() throws Exception {
// TODO Auto-generated method stub
System.out.println("afterPropertiesSet.........");

}

@Override
public void destroy() throws Exception {
// TODO Auto-generated method stub
//我们可以关闭数据链接 socket 文件流释放资源
System.out.println("destroy..........");
}
}

bean.xml

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MyBeanPostProcessor.java

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package com.lpq.beanlife;

import java.util.Date;

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

public class MyBeanPostProcessor implements BeanPostProcessor {

@Override
public Object postProcessAfterInitialization(Object arg0, String arg1)
throws BeansException {
// TODO Auto-generated method stub
System.out.println("postProcessAfterInitialization.........");
System.out.println(arg0+"被创建的时间是"+new Date().toLocaleString());
return arg0;
}

@Override
public Object postProcessBeforeInitialization(Object arg0, String arg1)
throws BeansException {
// TODO Auto-generated method stub
System.out.println("postProcessBeforeInitialization.........");
return arg0;
}

}

App.java

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package com.lpq.beanlife;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;

public class App {
public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("com/lpq/beanlife/beans.xml");
PersonService ps = (PersonService)ac.getBean("person");
ps.sayHi();

System.out.println("-------------------------");

BeanFactory factory = new XmlBeanFactory(new ClassPathResource("com/lpq/beanlife/beans.xml"));
factory.getBean("person");
}
}

问题:通过BeanFactory来获取bean对象，bean的生命周期是否和Applicationcontext 是一样吗?

不是一样的，bean是工厂中创建的生命周期会简单一些:

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