标签：springaop   前置增强   后置增强   methodbeforeadvice   

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 {

	@Override
	public void greetTo(String name) {
		System.out.println("greet to "+name+"...");
	}

	@Override
	public 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 {
	
	@Override
	public 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 {

	@Override
	public 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");

	}
}

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");
	}
}

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

spring AOP 前置增强，后置增强小Demo

标签：springaop   前置增强   后置增强   methodbeforeadvice   

原文地址：http://blog.csdn.net/magi1201/article/details/45897915