Service.java

package bean;

public interface Service {
	public void service();
}

package bean;

public class ServiceImpl implements Service {
	//业务方法
	public void service() {
		// TODO Auto-generated method stub
		System.out.println("i'm servicing");
	}

}

package interceptor;
import org.springframework.stereotype.Component;

@Component
public class Interceptor {

	public void before() {
		System.out.println("服务即将开始");
	}

	public void afterReturning() {
		System.out.println("returning");
	}

	public void afterThrowing(RuntimeException ex) {
		System.out.println("find exception:" + ex.getMessage());
	}
}

<?xml version="1.0" encoding="GBK"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd
           http://www.springframework.org/schema/aop 
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
	<context:component-scan base-package="bean" />	<!-- bean包里面标记@component的类都会自动生成同名bean -->
	<bean name="interceptor" class="interceptor.Interceptor" />
	<aop:config>
		<aop:pointcut expression="execution(public * bean..*.*(..))"
			id="allPointcut" /> <!-- 切入点 也就是在什么时候执行切片方法的说明 -->
		<aop:aspect id="interceptor" ref="interceptor"> <!-- 将上面声明的bean定义为aspect -->
			<aop:before method="before" pointcut-ref="allPointcut" />	<!-- 在符合pointcut条件时执行method -->
		</aop:aspect>
	</aop:config>

</beans> 

package bean;

import java.lang.reflect.Proxy;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.beanfactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ServiceTest {

	@Test
	public void proxy() {
		beanfactory factory = new ClassPathXmlApplicationContext(
				"applicationContext.xml");
		Service s = (Service) factory.getBean("serviceImpl");
		s.service();
	}
}