spring AOP 前置增强，后置增强小Demo

服务员接口 Waiter.java

package com.paic.zhangqi.spring.aop;public interface Waiter {void greetTo(String name);void serveTo(String name);}

服务员接口实现类 NaiveWaiter.java

package com.paic.zhangqi.spring.aop;public class NaiveWaiter implements Waiter {@Overridepublic void greetTo(String name) {System.out.println("greet to "+name+"...");}@Overridepublic void serveTo(String name) {System.out.println("serving "+name+"...");}}

前置增强类 GreetingBeforeAdvice.java 在目标类方法执行前执行

package com.paic.zhangqi.spring.aop;import java.lang.reflect.Method;import org.springframework.aop.MethodBeforeAdvice;public class GreetingBeforeAdvice implements MethodBeforeAdvice {@Overridepublic void before(Method method, Object[] args, Object obj) throws Throwable {String clientName = (String)args[0];System.out.println("How are you！Mr."+clientName+".");}}

后置增强类GreetingAfterAdvice.java在目标类方法调用后执行

package com.paic.zhangqi.spring.aop;import java.lang.reflect.Method;import org.springframework.aop.AfterReturningAdvice;public class GreetingAfterAdvice implements AfterReturningAdvice {@Overridepublic void afterReturning(Object arg0, Method arg1, Object[] arg2,Object arg3) throws Throwable {System.out.println("Please enjoy yourself!");}}

测试类 TestAdvice.java

package com.paic.zhangqi.spring.aop;import org.springframework.aop.AfterAdvice;import org.springframework.aop.BeforeAdvice;import org.springframework.aop.framework.ProxyFactory;public class TestAdvice {public static void main(String[] args) {Waiter target = new NaiveWaiter();BeforeAdvice beforeAdvice = new GreetingBeforeAdvice();AfterAdvice afterAdvice = new GreetingAfterAdvice();// spring 提供的代理工厂ProxyFactory pf = new ProxyFactory();// 设置代理目标pf.setTarget(target);// 为代理目标添加增强pf.addAdvice(beforeAdvice);pf.addAdvice(afterAdvice);// 生成代理实例Waiter proxy = (Waiter)pf.getProxy();proxy.greetTo("John");proxy.serveTo("Tomcat");}}

输出结果

How are you！Mr.John.greet to John...Please enjoy yourself!How are you！Mr.Tomcat.serving Tomcat...Please enjoy yourself!

使用配置文件进行配置 beans.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:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean id="greetingBefore" class="com.paic.zhangqi.spring.aop.GreetingBeforeAdvice" /><bean id="greetingAfter" class="com.paic.zhangqi.spring.aop.GreetingAfterAdvice" /><bean id="target" class="com.paic.zhangqi.spring.aop.NaiveWaiter" /><bean id="waiter" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="proxyInterfaces" value="com.paic.zhangqi.spring.aop.Waiter" /><property name="interceptorNames" value="greetingBefore,greetingAfter" /><property name="target" ref="target" /></bean></beans>

对应的测试类 SpringConfigTest.java

package com.paic.zhangqi.spring.aop;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class SpringConfigTest {public static void main(String[] args) {String configPath = "com/paic/zhangqi/spring/aop/beans.xml";ApplicationContext ctx = new ClassPathXmlApplicationContext(configPath);Waiter waiter = (Waiter) ctx.getBean("waiter");waiter.greetTo("John");waiter.serveTo("Tomcat");}}

同样得到输出

How are you！Mr.John.greet to John...Please enjoy yourself!How are you！Mr.Tomcat.serving Tomcat...Please enjoy yourself!