OkHttp + Spring的多部分文件上传

Question

我最近切换到OkHttp。 切换后，下面的代码执行上传操作。

RequestBody requestBody = new MultipartBuilder()
                        .type(MultipartBuilder.FORM)
                        .addPart(
                                Headers.of("Content-Disposition", "form-data; name=\"qqfile\""),
                                RequestBody.create(
                                        MediaType.parse(filename),
                                        new File(filename)))
                        .build();

如果您比较这两张图片，第二张图片中的 multipartFiles 的大小为0。它应该是 size = 1。如何正确地使用 OkHttp 填充 multipartHttpRequest，以便使服务器接受成功上传？

控制器代码：

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import org.springframework.http.MediaType;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.util.WebUtils;

@RequestMapping (
        method = RequestMethod.POST,
        value = "/upload",
        produces = MediaType.APPLICATION_JSON_VALUE + ";charset=UTF-8"
)
public String upload(
        HttpServletRequest request,
        HttpServletResponse response
) throws IOException {
    boolean isMultipart = ServletFileUpload.isMultipartContent(request);
    if (isMultipart) {
        MultipartHttpServletRequest multipartHttpRequest = 
        WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);

        final List<MultipartFile> files = multipartHttpRequest.getFiles("qqfile");

        if (files.isEmpty()) {
            LOG.error("qqfile name missing in request or no file uploaded");
            return some error code here
        }

        MultipartFile multipartFile = files.iterator().next();
        //process file code below
    }
    return failure;
}

- java_dude

---

你能展示一下你的控制器吗？ - Marcus Henrique

@MarcusHenrique 我已经添加了控制器代码。 - java_dude

Answer 1

您可以更轻松地获取MultipartFile：

@RequestMapping(value = "/upload", method = RequestMethod.POST)
public String upload(@RequestParam("qqfile") MultipartFile file) throws IOException {
    if (!file.isEmpty()) {
        // ...
    }
    return "failure";
}

然后，使用OkHttp：

RequestBody body = new MultipartBuilder()
    .addFormDataPart("qqfile", filename, RequestBody.create(MediaType.parse("media/type"), new File(filename)))
    .type(MultipartBuilder.FORM)
    .build();

Request request = new Request.Builder()
    .url("/path/to/your/upload")
    .post(body)
    .build();

OkHttpClient client = new OkHttpClient();
Response response = client.newCall(request).execute();

对我来说，那很好用。

使用MediaType.parse(filename)时要小心，必须传递有效的类型，例如text/plain、application/json、application/xml等...

- Marcus Henrique

Answer 2

Builder requestBodyBuilder = new MultipartBody.Builder()
                        .setType(MultipartBody.FORM);
File file= new File(FILE_PATH + FILE_NAME);
requestBodyBuilder.addFormDataPart("file", FILE_NAME, RequestBody.create(MultipartBody.FORM, file));

fileVO.getOriginalFlnm（）

您可以省略此字段。

同时，您需要在标头中设置'MultipartHttpServletRequest'参数和consumes, produces。

@PostMapping(path = "/save", consumes = "multipart/*", produces = "application/json;charset=utf-8")
public boolean CONTROLLER(MultipartHttpServletRequest request, @RequestParam Map<String, Object> param) {
    boolean result = SERVICE.save(request, param);
    return result;
}

- 자몽.