java - 无法将文件从一个服务器上传到另一个服务器

Question

我正在尝试将我的服务器上的文件上传到另一台服务器。在做这件事的同时我收到此错误:已解决[org.springframework.web.multipart.support.MissingServletRequestPartException:所需的请求部分"file"不存在]


我已将"file"键放入体内。我无法弄清楚为什么会发生这种情况。

上传服务器:

                HttpHeaders headers = new HttpHeaders();
                headers.setContentType(MediaType.MULTIPART_FORM_DATA);
                MultiValueMap<String, Object> body
                        = new LinkedMultiValueMap<>();
                body.add("file", Paths.get("pathToFile").toFile());
                HttpEntity<MultiValueMap<String, Object>> requestEntity
                        = new HttpEntity<>(body, headers);

                RestTemplate restTemplate = new RestTemplate();
                ResponseEntity<String> response = restTemplate
                        .postForEntity(url, requestEntity, String.class);

我们上传到的服务器:

@RequestMapping(value = "/api", method = RequestMethod.POST, consumes = MediaType.ALL_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<ResponseDTO> solveUsingJar(@RequestParam("file") MultipartFile file) {
}

Answer 1

我分享了一些代码，用于将一台服务器上的文件上传到另一台服务器。

第 1 步:在 Server-1 中上传文件:

@PostMapping("/upload/profile")
public UploadFileResponse uploadProfileImg(@RequestPart("file") MultipartFile file)
{       
    return fileService.uploadProfileImg(file);
}

第 2 步:使用 RestTemplate 在 Server-2 中上传该文件。

public String upload(MultipartFile file) throws IOException 
{
    ResponseEntity<UploadFileResponse> response = null;

    try
    {
        File convFile = new File(file.getOriginalFilename());           

        convFile.createNewFile();       

        FileOutputStream fos = new FileOutputStream(convFile);          
        fos.write(file.getBytes());
        fos.close();

        LinkedMultiValueMap<String, Object> map = new LinkedMultiValueMap<>();

        String uploadURI = KeyConstant.FILE_UPLOAD_API_URI+"/file";     // Server-2(file Directory) FILE_UPLOAD_API_URI : http://27.34.2.33:28181/upload/file

        map.add("file",  new FileSystemResource(convFile));

        HttpHeaders headers = new HttpHeaders();

        headers.setContentType(MediaType.MULTIPART_FORM_DATA);

        HttpEntity<LinkedMultiValueMap<String, Object>> requestEntity = new HttpEntity<>(map, headers);

        RestTemplate restTemplate = new RestTemplate();

        response = restTemplate.exchange(uploadURI, HttpMethod.POST, requestEntity, UploadFileResponse.class);      
    }
    catch(Exception e) {e.printStackTrace();}

    return response.getBody();
}

第 3 步:Server-2 文件上传休息 Controller :

@PostMapping("/upload/file")
public UploadFileResponse uploadFileByDirectory(@RequestPart(value = "file") MultipartFile file)
{
    return this.amazonClient.uploadFilebyDirectory(KeyConstant.AMAZON_S3_PATH, file);
}