AspectJ的注解开发AOP：切点定义

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;

import java.math.BigInteger;

@Aspect
public class aspectj {
    @Before(value = "execution(* com.AspecJ.xiaomaoDao.*(..))")
    public void before(){
        System.out.println("我是前置通知！");
    }


    @AfterReturning(value = "Mypoint2()",returning = "element")
//    使用returning来接受返回值
    public void After(Object element){
        System.out.println("我删除了"+element); //打印输出了返回值
    }

    @Around(value="MyPoint1()")
    public Object around(ProceedingJoinPoint joinPoint){
        Object obj=null;
        System.out.println("环绕前");
        try {
            obj=joinPoint.proceed();
        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
        System.out.println("环绕后");
        return obj;
    }



    @AfterThrowing(value = "MyPoint()",throwing = "throwinfo")
    public void throwafter(Throwable throwinfo){
        System.out.println("发生了异常，异常信息如下：");
        System.out.println(throwinfo.getMessage());
    }



    @After(value = "MyPoint()")
    public void after(){
        System.out.println("最终通知执行了！");
    }

    @Pointcut(value = "execution(* com.AspecJ.xiaomaoDao.find())")
    public void MyPoint(){}

    @Pointcut(value = "execution(* com.AspecJ.xiaomaoDao.update())")
    public void MyPoint1(){}

    @Pointcut(value = "execution(* com.AspecJ.xiaomaoDao.delete())")
    public void Mypoint2(){}

}