1 package com.yl.spring.aop.impl;
 2
 3 import java.util.Arrays;
 4 import java.util.List;
 5
 6 import org.aspectj.lang.JoinPoint;
 7 import org.aspectj.lang.annotation.After;
 8 import org.aspectj.lang.annotation.Aspect;
 9 import org.aspectj.lang.annotation.Before;
10 import org.springframework.stereotype.Component;
11
12 //这个类声明为一个切面：需要把该类放入到IOC容器中；再声明为一个切面
13 @Aspect
14 @Component
15 public class LoggingAspect {
16
17     //声明该方法是一个前置通知：在目标方法开始之前执行
18     //@Before("execution(public int com.yl.spring.aop.impl.ArithmeticCalculatorImpl.add(int, int))")
19     @Before("execution(* com.yl.spring.aop.impl.*.*(..))")
20     public void beforeMethod(JoinPoint joinpoint) {
21         String methodName = joinpoint.getSignature().getName();
22         List<Object> args = Arrays.asList(joinpoint.getArgs());
23         System.out.println("The method " + methodName + " begins with " + args);
24     }
25     //后置通知：在目标方法执行后（无论是否发生异常），执行的通知
26     //在后置通知中，还不能访问目标方法执行的结果
27     @After("execution(* com.yl.spring.aop.impl.*.*(..))")
28     public void afterMethod(JoinPoint joinPoint) {
29         String methodName = joinPoint.getSignature().getName();
30         List<Object> args = Arrays.asList(joinPoint.getArgs());
31         System.out.println("The method " + methodName + " end with " + args);
32     }
33
34 }

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:aop="http://www.springframework.org/schema/aop"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
 7         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 8         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
 9
10     <!-- 配置自动扫描的包 -->
11     <context:component-scan base-package="com.yl.spring.aop.impl"></context:component-scan>
12
13     <!-- 使AspectJ注解起作用：自动为匹配的类生成代理对象 -->
14     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
15
16 </beans>

 1 package com.yl.spring.aop.impl;
 2
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5
 6 public class Main {
 7     public static void main(String[] args) {
 8
 9         ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
10
11         ArithmeticCalculator arithmeticCalculator = ctx.getBean(ArithmeticCalculator.class);
12
13         int result = arithmeticCalculator.add(4, 6);
14         System.out.println("result: " + result);
15
16         result = arithmeticCalculator.mul(4, 6);
17         System.out.println("result: " + result);
18     }
19 }