spring --(20)重用切點表達式

直接上代碼

package com.test.aop.impl;

import java.util.Arrays;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

/**
 * 切面類
 * 1.須要將該類放入到IOC容器中
 * 2.再將它申明爲一個切面
 */

@Order(2)
@Aspect
@Component
public class LoggingAspect {
	
	/**
	 * 定義一個方法，聲明切入點表達式
	 * 使用@Pointcut用來申明切入點表達式
	 */
	@Pointcut("execution(* com.test.aop.impl.CalculatorImpl.*(int,int))")
	public void declareJointPointExpression() {
		
	}
	
	//環繞通知
	@Around("declareJointPointExpression()")
	public Object Around(ProceedingJoinPoint proceedingJoinPoint){
		
		Object result = null;
		String methodName = proceedingJoinPoint.getSignature().getName();
		try {
			//前置通知
			System.out.println("The method"+methodName+"begin with:"+Arrays.asList(proceedingJoinPoint.getArgs()));
			result = proceedingJoinPoint.proceed();
			//返回通知
			System.out.println("The method" + methodName + "end with:"+result);
		} catch (Throwable e) {
			//異常通知
			System.out.println("The method" + methodName + "occurs exception:"+e);	
		}
		//後置通知
		System.out.println("The method" + methodName + "end ");
		return result;
	}
}

外部使用該申明方法

package com.test.aop.impl;

import java.util.Arrays;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Order(1)
@Aspect
@Component
public class Validation {
	
	@Before("com.test.aop.impl.LoggingAspect.declareJointPointExpression()")
	public void validateArgs(JoinPoint joinPoint) {
		System.out.println("validate:"+Arrays.asList(joinPoint.getArgs()));
	}
}