如何通过retrofit上传图片？

Question

我浏览了很多 Whosebug 的答案，但无法上传图片。它曾经给我Internal Server Error。现在我找到了一个但它向服务器发送了一个空图像。你能告诉我哪里做错了吗

这是我的请求代码：

@Multipart
@POST("lostandfound")
Call<ResponseBody> uploadLostAndFound(@PartMap Map<String, RequestBody> map);

还有我的 CALL:

    Map<String, RequestBody> map = new HashMap<>();
    map.put("usermail", toRequestBody("mohammad_sed"));
    map.put("content", toRequestBody(content));
    map.put("islost", toRequestBody(String.valueOf(isLost)));
    map.put("wasfound", toRequestBody(foundPlace));
    map.put("tofind", toRequestBody(toFindPlace));

    File file = new File(destination);


    RequestBody reqFile = RequestBody.create(MediaType.parse("image"), file);
    MultipartBody.Part body = MultipartBody.Part.createFormData("upload", file.getName(), reqFile);
    map.put("img", body);

    ForumService client = Utils.getBuilder().create(ForumService.class);
    Call<ResponseBody> call = client.uploadLostAndFound(map);
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
            if (response.isSuccessful()) {
                mProgressDialog.dismiss();
                // Toast.makeText(getApplicationContext(), "Request created", Toast.LENGTH_SHORT).show();
            } else {
                mProgressDialog.dismiss();
            }
        }

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {
            mProgressDialog.dismiss();
            Toast.makeText(getApplicationContext(), "Failed to upload!", Toast.LENGTH_SHORT).show();
        }
    });

    // This method  converts String to RequestBody
    public static RequestBody toRequestBody(String value) {
        RequestBody body = RequestBody.create(MediaType.parse("text/plain"), value);
        return body;
    }

我试过了：

@Multipart
@POST("lostandfound")
Call<ResponseBody> uploadLostAndFound(@Part MultipartBody.Part photo,
                                      @PartMap Map<String, RequestBody> map);

但是这样我得到 Internal server error。
提前致谢。

Answer 1

我找到了解决方案。
我从 postman 尝试过，它工作正常。

解决方案是我必须使用：

@Multipart
@POST("lostandfound")
Call<ResponseBody> uploadLostAndFound(@Part MultipartBody.Part photo,
                                  @PartMap Map<String, RequestBody> map);

和：

RequestBody reqFile = RequestBody.create(MediaType.parse("image/*"), file);
MultipartBody.Part body = MultipartBody.Part.createFormData("img", file.getName(), reqFile);

变化是我必须使用 "img" 而不是 "upload"。这是一个愚蠢的错误 :D

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