AOP @Around:返回BAD_REQUEST响应 [英] AOP @Around: return BAD_REQUEST response

问题描述

在Spring rest应用程序中，每个URL都必须以应用程序ID(appId)开头.必须在每个单独的REST服务中验证此appId.我尝试使用@Around建议创建一个@Aspect，而不是复制代码.可以在执行任何rest方法之前正确执行此操作.

In a Spring rest application, every single URL must start with an application id (appId). This appId must be validated in every single rest service. Instead of duplicating code, I tried to create an @Aspect with an @Around advice. This is correctly executed before any rest method.

但是，如果应用程序ID未知，我既不想创建堆栈跟踪，也不想返回200(响应确定).相反，我确实想返回一个BAD_REQUEST响应代码.

However, if the application id is unknown, I do not want neither to create a stack trace or neither to return a 200 (response OK). Instead I do want to return a BAD_REQUEST response code.

如果我在建议中抛出异常，则会得到堆栈跟踪，并且没有HTTP响应.另一方面，如果我返回其他任何内容(但不调用pjp.proceed)，则返回码为200.

If I throw an exception in my advice, I get a stack trace and no HTTP response. If I on the other hand return anything else (but do not call the pjp.proceed), I get a return code of 200.

任何人都可以帮助我将响应码400返回给请求者吗?

Could anyone please assist me on returning a response code 400 to the requestor?

到目前为止，我的代码如下:

Below my code so far:

@Component
@Aspect
public class RequestMappingInterceptor {

    @Autowired
    ListOfValuesLookupUtil listOfValuesLookupUtil;

    @Around("@annotation(requestMapping)")
    public Object around(ProceedingJoinPoint pjp, RequestMapping requestMapping) throws Throwable {
        Object[] arguments = pjp.getArgs();
        if(arguments.length == 0 || !listOfValuesLookupUtil.isValidApplication(arguments[0].toString())) {
            // toto : return bad request here ...
            throw new BadRequestException("Application id unknown!");
        } else {
            return pjp.proceed();
        }
    }
}

推荐答案

您需要访问 HttpServletResponse 并将其用于发送错误代码.您可以通过 RequestContextHolder

You need to access the HttpServletResponse and use that to send the error code. You can do this via the RequestContextHolder

@Around("@annotation(requestMapping)")
public Object around(ProceedingJoinPoint pjp, RequestMapping requestMapping) throws Throwable {
    Object[] arguments = pjp.getArgs();
    if(arguments.length == 0 || !listOfValuesLookupUtil.isValidApplication(arguments[0].toString())) {
        HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse());
        response.sendError(HttpStatus.PRECONDITION_FAILED.value(), "Application Id Unknown!");
        return null;
    } else {
        return pjp.proceed();
    }
}

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