Spring点滴四：Spring Bean生命周期
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 class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor" />
<bean id="beanLifecycle" class="com.test.spring.BeanLifecycle" init-method="init" destroy-method="close">
<property name="name" value="张三"></property>
<property name="sex" value="男"></property>
</bean>
<bean id="postProcessor" class="com.test.spring.PostProcessor"/> </beans>
Service Class:
package com.test.spring; import javax.annotation.PostConstruct; import javax.annotation.PreDestroy; 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,ApplicationContextAware{ 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; } /** * 依次开始调用初始化回调方法 */ @PostConstruct public void initPostConstruct(){ System.out.println("》》》注解初始化方法被调用"); } @Override public void afterPropertiesSet() throws Exception { System.out.println("》》》BeanLifecycle调用了InitailizingBean的afterPorpertiesSet方法了....."); } public void init (){ System.out.println("》》》init方法被调用"); } /** * 依次开始调用销毁回调方法 */ @PreDestroy public void preDestroy(){ System.out.println("》》》注解销毁方法被调用"); } @Override public void destroy() throws Exception { System.out.println("》》》BeanLifecycle从Spring IoC容器中移除了......."); } public void close() { System.out.println("》》》close方法被调用"); } @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 + "]"; } }
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......
2017-03-19 00:08:01 INFO:ClassPathXmlApplicationContext-Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6c7e6b26: startup date [Sun Mar 19 00:08:01 CST 2017]; root of context hierarchy
2017-03-19 00:08:01 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:张三
》》》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@75a6bd5: defining beans [narCodeService,org.springframework.context.annotation.CommonAnnotationBeanPostProcessor#0,beanLifecycle,postProcessor]; root of factory hierarchy
》》》调用ApplicationContextAware接口setApplicationContext方法:org.springframework.context.support.ClassPathXmlApplicationContext@6c7e6b26: startup date [Sun Mar 19 00:08:01 CST 2017]; root of context hierarchy
后置处理器处理bean=【beanLifecycle】开始
》》》注解初始化方法被调用
BeanLifecycle [name=张三, sex=男]
》》》BeanLifecycle调用了InitailizingBean的afterPorpertiesSet方法了.....
BeanLifecycle [name=张三, sex=男]
》》》init方法被调用
后置处理器处理bean=【beanLifecycle】完毕!
》》》Spring ApplicationContext容器初始化完毕了......
2017-03-19 00:08:03 INFO:ClassPathXmlApplicationContext-Closing org.springframework.context.support.ClassPathXmlApplicationContext@6c7e6b26: startup date [Sun Mar 19 00:08:01 CST 2017]; root of context hierarchy
》》》注解销毁方法被调用
》》》BeanLifecycle从Spring IoC容器中移除了.......
》》》close方法被调用
关于Spring BeanPostProcessor(后置处理器)讲解请查看：http://www.cnblogs.com/sishang/p/6576665.html
