spring中Bean的生命周期

先贴代码：
Life类

package com.open.bean;
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;
public class Life implements BeanFactoryAware, BeanNameAware,
        InitializingBean, DisposableBean {
    private String msg;
    public Life() {
        System.out.println("msg="+msg);
        System.out.println("构造函数");
    }
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        System.out.println("setBeanFactory");
    }
    public void setBeanName(String name) {
        System.out.println("setBeanName");
    }
    public void init() {
        System.out.println("初始化");
    }
    public Object postProcessBeforeInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessBeforeInitialization");
        return null;
    }
    public Object postProcessAfterInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessAfterInitialization");
        return null;
    }
    public void afterPropertiesSet() throws Exception {
        System.out.println("afterPropertiesSet");
    }
    public void destroy() throws Exception {
        System.out.println("destroy");
    }
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
}

BeanPostProcessorImp类

package com.open.bean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
public class BeanPostProcessorImp implements BeanPostProcessor {
    public Object postProcessBeforeInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessBeforeInitialization");
        return bean;
    }
    public Object postProcessAfterInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("postProcessAfterInitialization");
        return bean;
    }
}

BeanCounter类

package com.open.bean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
public class BeanCounter implements BeanFactoryPostProcessor {
    public void postProcessBeanFactory(
            ConfigurableListableBeanFactory beanFactory) throws BeansException {
        System.out.println("类的数量＝"+beanFactory.getBeanDefinitionCount());
    }
}

bean.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
    "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="life" name="life_name" class="com.open.bean.Life" 
        init-method="init">
        <property name="msg" value="lifexxxx"/>
    </bean>    
    <bean id="processor" class="com.open.bean.BeanPostProcessorImp"/>
    <bean id="counter" class="com.open.bean.BeanCounter"/>
</beans>

测试类

package com.open.bean;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext cx=
            new ClassPathXmlApplicationContext("bean.xml");
         Life life=(Life)cx.getBean("life");     
    }
} 

输出结果

• 类的数量＝3
• msg=null
• 构造函数
• setBeanName
• setBeanFactory
• postProcessBeforeInitialization
• afterPropertiesSet
• 初始化
• postProcessAfterInitialization

解释：

• 调用BeanFactoryPostProcessor接口的postProcessBeanFactory方法
• -->实例化,调用构造函数-->设置属性值
• -->调用BeanNameAware的setBeanName()方法
• -->调用BeanFactoryAware接口的setBeanFactory
• -->调用BeanPostProcessor接口的postProcessBeforeInitialization()
• -->调用InitializingBean接口的afterPropertiesSet()
• -->调用bean.xml中制定的init-method指定init()方法
• -->调用BeanPostProcessor接口的postProcessAfterInitialization()
• 容器关闭
• -->DisposableBean接口的destroy()
• -->调用bean.xml中制定的destroy-method指定的go()方法

评论

1 楼 supben 2010-09-14  

adddd