spring AOP之重用切点表达式

package com.gong.spring.aop.impl;

import java.util.Arrays;
import java.util.List;

import javax.management.RuntimeErrorException;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

//把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
@Aspect
@Component
public class LoggingAspect {
    //声明该方法为一个前置通知，在目标方法之前执行
    @Before("execution(public int com.gong.spring.aop.impl.Calculator.*(int, int))")
    public void beforeMethod(JoinPoint joinPoint) {
        String methodName = joinPoint.getSignature().getName();
        List<Object> args = Arrays.asList(joinPoint.getArgs());
        System.out.println(methodName+" begin with "+args);
    }
    //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
    //在后置通知中不能访问目标的执行结果
    @After("execution(public int com.gong.spring.aop.impl.Calculator.*(int, int))")
    public void afterMethod(JoinPoint joinPoint) {
        //获取名字
        String methodName = joinPoint.getSignature().getName();
        //获取参数
        List<Object> args = Arrays.asList(joinPoint.getArgs());
        System.out.println(methodName+" end with "+args);
    }
}

    @Pointcut("execution(public int com.gong.spring.aop.impl.Calculator.*(int, int))")
    public void declarJoinPointExpression() {}

@Before("declarJoinPointExpression()")
@After("declarJoinPointExpression()")