Question

我正在尝试使用通过spring公开的端点将文件上传到服务器。但是，当我尝试通过邮递员测试api时，出现“当前请求不是多部分请求错误”。我遇到了这个问题MultipartException: Current request is not a multipart request，但仍然无法解决。请帮忙。预先感谢。

这是我的控制人：

@RestController
@RequestMapping
public class UploadController {

    @Autowired
    StorageService storageService;

    List<String> files = new ArrayList<String>();

    @PostMapping("/post")
    public ResponseEntity<String> handleFileUpload(@RequestParam("file") MultipartFile file) {
        String message = "";
        try {
            storageService.store(file);
            files.add(file.getOriginalFilename());

            message = "You successfully uploaded " + file.getOriginalFilename() + "!";
            return ResponseEntity.status(HttpStatus.OK).body(message);
        } catch (Exception e) {
            message = "FAIL to upload " + file.getOriginalFilename() + "!";
            return ResponseEntity.status(HttpStatus.EXPECTATION_FAILED).body(message);
        }
    }

    @GetMapping("/getallfiles")
    public ResponseEntity<List<String>> getListFiles(Model model) {
        List<String> fileNames = files
                .stream().map(fileName -> MvcUriComponentsBuilder
                        .fromMethodName(UploadController.class, "getFile", fileName).build().toString())
                .collect(Collectors.toList());

        return ResponseEntity.ok().body(fileNames);
    }

    @GetMapping("/files/{filename:.+}")
    @ResponseBody
    public ResponseEntity<Resource> getFile(@PathVariable String filename) {
        Resource file = storageService.loadFile(filename);
        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + file.getFilename() + "\"")
                .body(file);
    }
}

我的服务：

@Service
public class StorageService {

    Logger log = LoggerFactory.getLogger(this.getClass().getName());
    private final Path rootLocation = Paths.get("upload-dir");

    public void store(MultipartFile file) {
        try {
            Files.copy(file.getInputStream(), this.rootLocation.resolve(file.getOriginalFilename()));
        } catch (Exception e) {
            throw new RuntimeException("FAIL!");
        }
    }

    public Resource loadFile(String filename) {
        try {
            Path file = rootLocation.resolve(filename);
            Resource resource = new UrlResource(file.toUri());
            if (resource.exists() || resource.isReadable()) {
                return resource;
            } else {
                throw new RuntimeException("FAIL!");
            }
        } catch (MalformedURLException e) {
            throw new RuntimeException("FAIL!");
        }
    }

    public void deleteAll() {
        FileSystemUtils.deleteRecursively(rootLocation.toFile());
    }

    public void init() {
        try {
            Files.createDirectory(rootLocation);
        } catch (IOException e) {
            throw new RuntimeException("Could not initialize storage!");
        }
    }
}

正如您在下面看到的，我正在以文件形式Data发送文件，并且没有设置标题

Answer 1

请参见下图，并将键值添加为file

Answer 2

尝试添加您的请求标头Content-Type: multipart/form-data（据我在邮递员中看到的消息）

Answer 3

您的控制器需要一个请求参数“文件”：

@RequestParam("file") MultipartFile file

您必须在邮递员中设置键“文件”，其中值是您的文件（最后一个屏幕截图）。

通过邮递员测试上传端点

3 个答案: