发送接收到的spring文件部件而不保存

Question

private static String UPLOAD_ROOT = "C:\\pics\\";

public Mono<Void> checkInTest(@RequestPart("photo") Flux<FilePart> photoParts,
                              @RequestPart("data") CheckInParams params, Principal principal) {
    return saveFileToDisk(photoParts);
}

private Mono<Void> saveFileToDisk(Flux<FilePart> parts) {
    return parts
            .log("createImage-files")
            .flatMap(file -> {
                Mono<Void> copyFile = Mono.just(Paths.get(UPLOAD_ROOT, file.filename()).toFile())
                        .log("createImage-picktarget")
                        .map(destFile -> {
                            try {
                                destFile.createNewFile();
                                return destFile;
                            } catch (IOException e) {
                                throw new RuntimeException(e);
                            }
                        })
                        .log("createImage-newfile")
                        .flatMap(file::transferTo)
                        .log("createImage-copy");

                return Mono.when(copyFile)
                        .log("createImage-when");
            })
            .log("createImage-flatMap")
            .then()
            .log("createImage-done");
}

.map(destFile -> {
        MultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
        try {
            map.set("multipartFile", new ByteArrayResource(FileUtils.readFileToByteArray(destFile)));
        } catch (IOException ignored) {
        }
        map.set("fileName", "test.txt");
        WebClient client = WebClient.builder().baseUrl("http://localhost:8080").build();

        return client.post()
                .uri("/upload")
                .contentType(MediaType.MULTIPART_FORM_DATA)
                .syncBody(map)
                .exchange(); //todo handle errors???
    }).then()

Answer 1

我将提到@Abhinaba Chakraborty
在https://stackoverflow.com/A/62745370/4551411中提供的解决方案

大概是这样的：

  @PostMapping(value = "/images/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
  public Mono<ResponseEntity<Void>> uploadImages(@RequestPart("files") Flux<FilePart> fileParts) {
    return fileParts
        .flatMap(filePart -> {
          return webClient.post()
              .uri("/someOtherService")
              .body(BodyInserters.fromPublisher(filePart.content(), DataBuffer.class))
              .exchange()
              .flatMap(clientResponse -> {
                //some logging
                return Mono.empty();
              });
        })
        .collectList()
        .flatMap(response -> Mono.just(ResponseEntity.accepted().build()));
  }

这接受多部分表单数据，您可以附加多个图像文件并将它们上传到另一个服务。