There was an unexpected error (type=Bad Request, status=400).以及@RequestBody和@RequestParam区别

男娘i 2022-10-26 14:27 34阅读 0赞

今天在使用spring boot做设备微服务的开发时，报出了标题中的错误，完成的错误信息如下

Whitelabel Error Page
    This application has no explicit mapping for /error, so you are seeing this as a fallback.
    
    Tue Feb 02 15:42:15 CST 2021
    There was an unexpected error (type=Bad Request, status=400).

翻译最后一句为：发生意外错误（类型=错误的请求，状态= 400） ，如下贴出我的代码

@RequestMapping(value = "/detail", method = RequestMethod.GET)
        public ResponseDto getDeviceDetail(
                @RequestHeader(name = Constant.HEADER_X_TRACE_ID, required = false) String traceId,
                @Validated @RequestBody DetailDeviceRequestBody requestBody,
                @PathVariable String requestPath,
                @PathVariable String requestCategory
        ) { 
            。。。。。。
            String sn = requestBody.getSn();
            if ( isBlank(sn)) { 
                return new ResponseDto(ErrorResponse.REQUEST_ERROR.getCode(),ErrorResponse.REQUEST_ERROR.getMessage());
            }
            。。。
            return iDeviceService.getDeviceDetail(deviceEntity);
        }

问题出现在这里 `@Validated @RequestBody DetailDeviceRequestBody requestBody,`，我明明是get请求，却使用`@RequestBody`去接收数据，然而get请求是没有请求体的，因为报出了这样的，我们可以使用`@RequestParam`来接收，如下代码所示

@RequestMapping(value = "/detail", method = RequestMethod.GET)
        public ResponseDto getDeviceDetail(
                @RequestHeader(name = Constant.HEADER_X_TRACE_ID, required = false) String traceId,      
                @RequestParam(required = false) String sn,
                @PathVariable String requestPath,
                @PathVariable String requestCategory
        ) { 
            if ( isBlank(sn)) { 
                return new ResponseDto(ErrorResponse.REQUEST_ERROR.getCode(),ErrorResponse.REQUEST_ERROR.getMessage());
            }
            。。。
            return iDeviceService.getDeviceDetail(deviceEntity);
        }

这样就能轻松地接收get的请求值了。

下面链接是说明@RequestBody和@RequestParam区别：[@RequestBody和@RequestParam区别][RequestBody_RequestParam]

[RequestBody_RequestParam]: https://blog.csdn.net/weixin_38004638/article/details/99655322