AspectJ的注解开发AOP：异常抛出通知的学习

Posted 2022-07-28 xiaolaha

异常抛出通知使用@AfterThrowing

在切面类中配置：

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 = "execution(* com.AspecJ.xiaomaoDao.delete())",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="execution(* com.AspecJ.xiaomaoDao.update())")
//    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 = "execution(* com.AspecJ.xiaomaoDao.find())",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());
    

目标类中的方法如下：

public class xiaomaoDao 
    public void save()
        System.out.println("save xiaomao!");
    
    public void find()
        System.out.println("find xiaomao!");
        int i=1/0;
    
    public String delete()
        System.out.println("delete xiaomao!");
        return "xiaomao";
    
    public void update()
        System.out.println("update xiaomao!");
    

执行后的结果如下：

delete xiaomao!
find xiaomao!
发生了异常，异常信息如下：
/ by zero