AspectJ的注解开发AOP：切点定义

Posted 2022-07-30 xiaolaha

通过@Pointcut为切点命名，方便我们统一管理

在每个通知内定义切点，会造成工作量大，不易维护，对于重复的切点，可以使用@Pointcut进行定义

切点方法：private void无参方法，方法名为切点名

当通知多个切点时，可以使用||来进行连接

具体代码：

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()