（十二.2）使用annotation方式演示AOP

一、核心代码

package com.target;

//com.target 目标接口 即核心代码
public interface ArithmeticCalculator {

	int add(int i,int j);
	int div(int i,int j);
}

package com.target;

import org.springframework.stereotype.Component;

@Component("arithmeticCalculator")
public class ArithmeticCalculator_impl implements ArithmeticCalculator{

	public int add(int i, int j) {
		// TODO Auto-generated method stub
		return i+j;
	}

	public int div(int i, int j) {
		// TODO Auto-generated method stub
		return i/j;
	}
	

}

二、切点+通知

import java.lang.reflect.Method;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

@Aspect
@Component("advice")
public class adviceMethod {

	@Before("execution(public int com.target.ArithmeticCalculator_impl.*(..))") //通知
	public void before(JoinPoint point)
			throws Throwable {
		System.out.println("连接点之前执行");
		
	}


}

三、applicationContext.xml

<!-- target -->
 <context:component-scan base-package="com.target">
 </context:component-scan>
 
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

结合十二.1来看@component、@aspect、@Before为什么这样写

注意十二.1和2的通知写法不同