通过Spring AOP + Aspectj进行异常处理

Question

在我的项目中,我有一个域层,它基本上是POJO和一个位于域层顶部的Spring控制器/服务层.我还有一个位于服务和域之间的AOP层.

我的域层正在抛出业务异常,这些异常现在正在服务层中处理.

但是我想更改它,以便在AOP层中处理从域层抛出的异常.AOP层会出现某种错误响应,并将其发送回Spring控制器/ Web服务层.

我可以创建一个IBizResponse并创建它的两个子类/接口,也许是SuccessResponse和ErrorResponse,并使我的域层方法返回IBizResponse.但是,我无法弄清楚如何使AOP将ErrorResponse对象返回到服务层.

Answer 1

请参阅https://docs.spring.io/spring/docs/4.1.0.RELEASE/spring-framework-reference/htmlsingle/#aop-introduction-defn的投掷后建议部分

抛出建议运行时,匹配的方法执行通过抛出异常退出.它是使用@AfterThrowing注释声明的:

例子

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.AfterThrowing;

@Aspect
public class AfterThrowingExample {

   @AfterThrowing("com.xyz.myapp.SystemArchitecture.dataAccessOperation()")
   public void doRecoveryActions() {
     // ...
    }

}



import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.AfterThrowing;

@Aspect
public class AfterThrowingExample {

    @AfterThrowing(
    pointcut="com.xyz.myapp.SystemArchitecture.dataAccessOperation()",
    throwing="ex")
    public void doRecoveryActions(DataAccessException ex) {
       // ...
     }

}

Answer 2

我遇到了同样的情况，在发生任何异常处理时，我必须返回错误响应 DTO。在@Aspect 类中，

@Aspect
@Component
public class MyAspect{

    private static final Logger LOGGER = LoggerFactory.getLogger(MyAspect.class);

    @Pointcut("execution(* com.linda.dao.strategy.*.*(..))")
    public void strategyMethods() { }

    @Pointcut("execution(* com.linda.controller.*.*(..)) || execution(* com.linda.Manager.*(..))")
    public void controllerMethods(){  }

    @Around("strategyMethods()")
    public Object profileStrategyMethods(ProceedingJoinPoint pjp) throws Throwable {

        long start = System.currentTimeMillis();
        Object output = null;
        LOGGER.info("Class:"+pjp.getTarget().getClass()+" entry -> method ->"+pjp.getSignature().getName());
        try{
            output = pjp.proceed();
            long elapsedTime = System.currentTimeMillis() - start;
            LOGGER.info("Method execution time: " + elapsedTime + " milliseconds.");
            LOGGER.info("Class:"+pjp.getTarget().getClass()+" exit -> method ->"+pjp.getSignature().getName());
        }catch(Throwable t){
            throw new InternalServerException(t.getMessage());  
        }

        return output;
    }

    @AfterThrowing(pointcut="execution(* com.linda.dao.strategy.*.*(..)) || execution(* com.linda.controller.*.*(..)) || execution(* com.linda.Manager.*(..))",throwing = "ex")
    public void doRecoveryActions(JoinPoint joinPoint, Throwable ex) {

        Signature signature = joinPoint.getSignature();
        String methodName = signature.getName();
        String stuff = signature.toString();
        String arguments = Arrays.toString(joinPoint.getArgs());
        LOGGER.error("Write something in the log... We have caught exception in method: "
                + methodName + " with arguments "
                + arguments + "\nand the full toString: " + stuff + "\nthe exception is: "
                + ex.getMessage());
    }
}

为异常处理定义了另一个类，如下所示：

@ControllerAdvice
public class ExceptionLogAdvice {

    @ExceptionHandler(InternalServerException.class)
    @ResponseStatus(HttpStatus.BAD_GATEWAY)
    @ResponseBody
    public ResponseEntity<Object> handleValidationException(final InternalServerException internalServerException){

        ErrorResponseDTO dto = constructErrorResponse(internalServerException);
        return ResponseEntity.status(HttpStatus.BAD_GATEWAY).body(dto);
    }
}

由于我无法共享实际代码，因此稍微调整了代码。希望我把概念说清楚了。