MissingServletRequestPartException：Springboot中不存在必需的请求部分'文件'

Question

我有一个执行文件上传的控制器，我正在尝试从另一个服务向控制器端点发送请求。

@RequestMapping(path = "/upload/{id}", method = RequestMethod.POST)
    public String uploadBaseImage(@RequestParam("data") String imageData, @RequestParam("file") MultipartFile file,@PathVariable("id") String id)
            throws Exception {
        String imageUrl = feedHandler.UploadAndSetImageUrl(imageData, file,Integer.parseInt(id));
        return imageUrl;
    }

我呼叫上述端点的代码

public SupplierFeedResponse uploadBaseFeedImage(String data, MultipartFile file, String supplierId) throws IOException {
        String uploadBaseFeedEndpoint = uploadFeedEndpoint+Constants.FEED_SERVICE_BASE_FEED_UPLOAD_URI+supplierId;
        SupplierFeedResponse supplierFeedResponse =  new SupplierFeedResponse();
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);
        MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
        body.add("file", new ByteArrayResource(file.getBytes()));
        body.add("data", data);

        log.info("Request body : "+body.toString());

        HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.postForEntity(uploadBaseFeedEndpoint, requestEntity, String.class);
        return supplierFeedResponse;

    }

我收到以下错误，不知道原因：

[MissingServletRequestPartException: Required request part 'file' is not present]

过去四处寻找解决方法。

Answer 1

可能您的请求中缺少“ file”参数，因此您必须在请求中考虑“ file”参数。您也可以在@RequestParam中添加新属性（required），例如@ RequestParam（value =“ file”，required = false）。 [required”属性的目的，是使请求参数为必需或可选。