代码实现:
PersonService.java
package cn.itcast.beanlife; 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 PersonService() { super(); System.out.println("构造函数被调用"); } public String getName() { return name; } public void setName(String name) { System.out.println("setName函数被调用"); this.name = name; } @Override public void setBeanName(String arg0) { System.out.println("BeanNameAware接口 " + arg0); } @Override public void setBeanFactory(BeanFactory arg0) throws BeansException { System.out.println("BeanFactoryAware接口 " + arg0); } @Override public void setApplicationContext(ApplicationContext arg0) throws BeansException { System.out.println("ApplicationContextAware接口 " + arg0); } @Override public void afterPropertiesSet() throws Exception { System.out.println("InitializingBean接口 "+"afterPropertiesSet方法"); } public void init(){ System.out.println("init-method='init' 方法被調用"); } @Override public void destroy() throws Exception { System.out.println("DisposableBean接口 "+"destroy方法"); } public void myDestroy(){ System.out.println("destroy-method "+"destroy方法"); } }
MyBeanPostProcessor.java
package cn.itcast.beanlife; 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 { System.out.println("BeanPostProcessor接口 "+"postProcessAfterInitialization"); return arg0; } @Override public Object postProcessBeforeInitialization(Object arg0, String arg1) throws BeansException { System.out.println("BeanPostProcessor接口 "+"postProcessBeforeInitialization"); return arg0; } }
applicationContext.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" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> <bean id="personService" init-method="init" destroy-method="myDestroy" class="cn.itcast.beanlife.PersonService"> <property name="name"> <value>wangjiang</value> </property> </bean> <bean id="myBeanPostProcessor" class="cn.itcast.beanlife.MyBeanPostProcessor"/> </beans>
Test.java:
package cn.itcast.beanlife; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Test { public static void main(String[] args) { ApplicationContext ac = new ClassPathXmlApplicationContext("cn/itcast/beanlife/applicationContext.xml"); PersonService ps = (PersonService) ac.getBean("personService"); System.out.println(ps.getName()); } }
输出结果:
注意:
如果使用BeanFactory来创建bean对象,会缺少ApplicationContext以及BeanPostProcessor的before和after方法。输出结果如下所示: