Spring点滴四：Spring Bean生命周期

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Spring点滴四：Spring Bean生命周期

2024-09-09 09:13:24 218人阅读

Spring Bean 生命周期示意图:

了解Spring的生命周期非常重要，我们可以利用Spring机制来定制Bean的实例化过程。

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spring-service.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!-- 定义一个bean -->
    <bean id="narCodeService" class="com.test.service.impl.NarCodeServiceImpl">
    </bean>
    <bean id="beanLifecycle" class="com.test.spring.BeanLifecycle" init-method="init">
        <property name="name" value="http://www.mamicode.com/张三"></property>
        <property name="sex" value="http://www.mamicode.com/男"></property>
    </bean>
</beans>

Service Class:

package com.test.spring;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanClassLoaderAware;
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;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.context.annotation.ImportAware;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotationMetadata;

import com.sun.org.apache.xml.internal.security.Init;

/**
 * 测试Spring Bean的生命周期
 * @author zss
 *
 */
public class BeanLifecycle implements InitializingBean,DisposableBean
,BeanFactoryAware,BeanNameAware,BeanPostProcessor{
    private String name;
    private String sex;
    
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        System.out.println("》》》调用BeanLifecycle对象"+this.getName()+"属性set方法，设值为:"+name);
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        System.out.println("》》》调用BeanLifecycle对象"+this.getSex()+"属性set方法，设值为:"+sex);
        this.sex = sex;
    }
    public void init (){
        System.out.println("》》》init方法被调用");
    }
    
    public void  close() {
        System.out.println("》》》close方法被调用");
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println(this);
        System.out.println("》》》BeanLifecycle调用了InitailizingBean的afterPorpertiesSet方法了.....");
        
    }

    @Override
    public void destroy() throws Exception {
        System.out.println("》》》BeanLifecycle从Spring IoC容器中移除了.......");
    }

//    @Override
//    public void setApplicationContext(ApplicationContext paramApplicationContext)
//            throws BeansException {
//        System.out.print("》》》调用ApplicationContextAware接口setApplicationContext方法:");
//        System.out.println(paramApplicationContext);    
//        
//    }

//    @Override
//    public void setResourceLoader(ResourceLoader paramResourceLoader) {
//        System.out.print("》》》调用ResourceLoaderAware接口setResourceLoader方法:");
//        System.out.println(paramResourceLoader);        
//    }

//    @Override
//    public void setImportMetadata(AnnotationMetadata paramAnnotationMetadata) {
//        System.out.println(333333);        
//    }

//    @Override
//    public void setEnvironment(Environment paramEnvironment) {
//        System.out.print("》》》调用EnvironmentAware接口setEnvironment方法:");
//        System.out.println(paramEnvironment);        
//    }

    @Override
    public void setBeanName(String paramString) {
        System.out.println("》》》调用BeanNameAware接口setBenaName方法: "+paramString);
        
    }

    @Override
    public void setBeanFactory(BeanFactory paramBeanFactory)
            throws BeansException {
        
        System.out.print("》》》调用BeanFactoryAware接口setBeanFactory方法:");
        System.out.println(paramBeanFactory);
        
    }

//    @Override
//    public void setBeanClassLoader(ClassLoader paramClassLoader) {
//        System.out.print("》》》调用BeanClassLoaderAware接口setBeanClassLoader方法:");
//        System.out.println(paramClassLoader);        
//    }

//    @Override
//    public void setApplicationEventPublisher(
//            ApplicationEventPublisher paramApplicationEventPublisher) {
//        System.out.print("》》》调用ApplicationEventPublisherAware接口setApplicationEventPublisher方法:");
//        System.out.println(paramApplicationEventPublisher);    
//    }

    @Override
    public String toString() {
        return "BeanLifecycle [name=" + name + ", sex=" + sex + "]";
    }

    @Override
    public Object postProcessAfterInitialization(Object arg0, String arg1)
            throws BeansException {
        System.out.println("调用了postProcessAfterInitialization方法");
        return null;
    }

    @Override
    public Object postProcessBeforeInitialization(Object arg0, String arg1)
            throws BeansException {
        System.out.println("调用了postProcessBeforeInitialization方法");
        return null;
    }

}

Test:

package com.test.spring;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class T {
    ClassPathXmlApplicationContext applicationcontext=null;
    @Before
    public void before() {
        System.out.println("》》》Spring ApplicationContext容器开始初始化了......");
        applicationcontext= new ClassPathXmlApplicationContext(new String[]{"test1-service.xml"});
        System.out.println("》》》Spring ApplicationContext容器初始化完毕了......");
    }
    @Test
    public void  test() {
        BeanLifecycle beanLifecycle =applicationcontext.getBean("beanLifecycle",BeanLifecycle.class);
        //applicationcontext.close();
        applicationcontext.registerShutdownHook();   
    }
}

测试结果：

》》》Spring ApplicationContext容器开始初始化了......
2017-03-18 20:29:20  INFO:ClassPathXmlApplicationContext-Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6c7e6b26: startup date [Sat Mar 18 20:29:20 CST 2017]; root of context hierarchy
2017-03-18 20:29:20  INFO:XmlBeanDefinitionReader-Loading XML bean definitions from class path resource [test1-service.xml]
》》》调用BeanLifecycle对象null属性set方法，设值为:周四上
》》》调用BeanLifecycle对象null属性set方法，设值为:男
》》》调用BeanNameAware接口setBenaName方法: beanLifecycle
》》》调用BeanFactoryAware接口setBeanFactory方法:org.springframework.beans.factory.support.DefaultListableBeanFactory@2b763bac: defining beans [narCodeService,beanLifecycle]; root of factory hierarchy
BeanLifecycle [name=张三, sex=男]
》》》BeanLifecycle调用了InitailizingBean的afterPorpertiesSet方法了.....
》》》init方法被调用
调用了postProcessBeforeInitialization方法
》》》Spring ApplicationContext容器初始化完毕了......
2017-03-18 20:29:20  INFO:ClassPathXmlApplicationContext-Closing org.springframework.context.support.ClassPathXmlApplicationContext@6c7e6b26: startup date [Sat Mar 18 20:29:20 CST 2017]; root of context hierarchy
》》》BeanLifecycle从Spring IoC容器中移除了.......
》》》close方法被调用

Spring点滴四：Spring Bean生命周期

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Spring点滴四：Spring Bean生命周期

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