java - SpringBoot WebService客户端: MultipartFile and String parameters

Question

我使用 SpringBoot 实现了上传 REST Web 服务，它接收 2 个参数:

• 字符串消息
• 一个文件

Web 服务代码如下所示:

@RequestMapping(value = "/uploadtest", consumes = { MediaType.MULTIPART_FORM_DATA}, method = RequestMethod.POST)
public ResponseEntity<Map<String, String>> upload(
                                                  @RequestParam("msg") String  msg,
                                                  @RequestParam("file") MultipartFile file) {

    System.out.println("uploadtest");
    return new ResponseEntity<>(singletonMap("url", "uploadtest"), HttpStatus.CREATED);

}

我正在尝试创建 Jersey WS 客户端。当 WS 仅接收 MultipartFile 参数时，以下代码可以正常工作:

Client client = ClientBuilder.newBuilder()
            .register(MultiPartFeature.class).build();
    WebTarget webTarget
            = client.target("http://localhost:8080/uploadtest");

    MultiPart multiPart = new MultiPart();
    multiPart.setMediaType(MediaType.MULTIPART_FORM_DATA_TYPE);

    FileDataBodyPart fileDataBodyPart = new FileDataBodyPart("file",
            new File("/filename.xml"),
            MediaType.APPLICATION_OCTET_STREAM_TYPE);
    multiPart.bodyPart(fileDataBodyPart);

    Response response = webTarget.request(MediaType.APPLICATION_JSON_TYPE)
            .post(Entity.entity(multiPart, multiPart.getMediaType()));

此外，如果两个参数都是字符串，则以下代码也有效:

Client client = ClientBuilder.newClient(clientConfig);
    WebTarget webTarget
            = client.target("http://localhost:8080/uploadtest");

    MultivaluedMap<String, String> formData = new MultivaluedHashMap<String, String>();
    formData.add("msg", "msg1");
    formData.add("mesgbis", "msg2");

    String responseResult = webTarget.request()
            .post(Entity.entity(formData, MediaType.MULTIPART_FORM_DATA), String.class);

我想了解是否有办法在 MultiPart 对象上创建 bodyPart 以便创建 String 和 MultipartFile 参数。如果不是，我该如何完成对 WS 的请求？

Answer 1

最后我设法让它工作如下:

Client client = ClientBuilder.newBuilder()
            .register(MultiPartFeature.class).build();
    WebTarget webTarget
            = client.target("http://localhost:8080/uploadtest");

    MultiPart multiPart = new MultiPart();
    multiPart.setMediaType(MediaType.MULTIPART_FORM_DATA_TYPE);

    FileDataBodyPart fileDataBodyPart = new FileDataBodyPart("file",
            new File("/filename.xml"),
            MediaType.APPLICATION_OCTET_STREAM_TYPE);

    FormDataBodyPart bodyPartMsg = new FormDataBodyPart("msg", "custom msg");
    multiPart.bodyPart(bodyPartMsg);
    multiPart.bodyPart(fileDataBodyPart);

    Response response = webTarget.request(MediaType.APPLICATION_JSON_TYPE)
            .post(Entity.entity(multiPart, multiPart.getMediaType()));