Question: Retrofit 2 file upload does not attach file

Question

Retrofit 2 file upload does not attach file

Answers 1
Added at 2016-12-30 18:12
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Question

I've written a upload action on server using asp core and I've tested that with ARC and files gets received.

Correctness Evidence

But when I try to upload image with Retrofit, nothing gets send. Even the form is empty:

Fault Occured

The source Code of interface is here. The interface:

public interface QuestionWebService {

    @Multipart
    @POST("questionapi/uploadfiles")
    Call<ResponseBody> uploadSync(@Part("fileUpload") RequestBody paramTypedFile);
}

and the usage in async task:

@Override
    protected Boolean doInBackground(String... params) {


            File fileToSend = new File(params[0]);

//            fileToSend.renameTo()

            RequestBody typedFile = RequestBody.create(MediaType.parse("image/*"), fileToSend);
            Response response = restClient.getQuestionService().uploadSync(typedFile).execute();

            if (response == null){
                Log.e(TAG, "success send server - failed");
                return  false;
            }
            if (response.isSuccessful()) {
                Log.e(TAG, "success send server - 200 status");
            } else {
                Log.e(TAG, "success send server - fail status - " + response.toString());
            }

        } catch (Exception e) {
            //throw new RuntimeException(e);
            Log.e(TAG,e.getMessage().toString());
            return false;
        }

        return true;
    }

Any Idea about what should I try? Where am I Going Wrong. TG.

Answers
nr: #1 dodano: 2016-12-31 03:12

Finally I found the solution. I don't know the reason about why this code doesn't work but as this link says, I changed the:

public interface QuestionWebService {

    @Multipart
    @POST("questionapi/uploadfiles")
    Call<ResponseBody> uploadSync(@Part("fileUpload") RequestBody paramTypedFile);
}

to this one:

public interface QuestionWebService {

    @Multipart
    @POST("questionapi/uploadfiles")
    Call<ResponseBody> uploadSync(@Part("UserId") RequestBody UserId, @Part("answer") RequestBody answer, @Part MultipartBody.Part file);
}

and the usage from this:

RequestBody typedFile = RequestBody.create(MediaType.parse("image/*"), fileToSend);
            Response response = restClient.getQuestionService().uploadSync(typedFile).execute();

to this one:

// create RequestBody instance from file
            RequestBody requestFile =
                    RequestBody.create(MediaType.parse("multipart/form-data"), fileToSend);

            // MultipartBody.Part is used to send also the actual file name
            MultipartBody.Part body =
                    MultipartBody.Part.createFormData("fileUpload", fileToSend.getName(), requestFile);
RequestBody userId =
                    RequestBody.create(
                            MediaType.parse("multipart/form-data"), userIdString);

            // add another part within the multipart request
            String answerString = "hello, this is answer speaking";
            RequestBody answer =
                    RequestBody.create(
                            MediaType.parse("multipart/form-data"), answerString);

            Response response = restClient.getQuestionService().uploadSync(userId, answer, body).execute();

and now every thing goes right!!! I hope this will the others encounter same problem.

Now the data on server is a form with 2 fields, UserId and Answer, and a file named fileUpload. TG.

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