Multipart Retrofit 2.0 image upload

Question

I am trying to upload image by POST multipart request which should have structure like this :

-----------------------------219391268715340 Content-Disposition: form-data; name="photos[]"; filename="DSCF0157-Laptop.JPG" Content-Type: image/jpeg

(byte-data)

My code :

 MediaType mediaType = MediaType.parse("image/jpeg"); ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); byte[] byteArray = stream.toByteArray(); RequestBody file=RequestBody.create(mediaType, byteArray); map.put("form-data; name=\"photos[]\"; filename=\""+filename+".jpg",file);

I use map because of @PartMap annotation - I want to upload multiple files. My server returns http code 200 - but no files are uploaded. Api call has been tested - it works correctly if used by our web application. Any idea what I am doing wrong

Community · Accepted Answer · 2017-05-23 12:17:24Z

If you want to upload many files in a request using Retrofit 2, you can refer to my answer at the question below

Retrofit - Multipart request: Required MultipartFile parameter 'file' is not present

With some modifications:

WebAPIService.java:

@Multipart @POST("/api/fileupload") Call<ResponseBody> postFiles(@Part List<MultipartBody.Part> fileList);

FileActivity.java:

... List<MultipartBody.Part> fileList = new ArrayList<>(); for (int i = 0; i < 2; i++){ fileList.add(body); } Call<ResponseBody> call = service.postFiles(fileList); call.enqueue(new Callback<ResponseBody>() { @Override public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) { Log.i(LOG_TAG, "success"); } @Override public void onFailure(Call<ResponseBody> call, Throwable t) { Log.e(LOG_TAG, t.getMessage()); } });

Of course, with the above code, in fact, the same file (body) will be uploaded as 2 parts in the request. As a result, in web server, you will have 2 files with the same content, you can customize the fileList with many different files :)

Hope it helps!

ikhsanudinhakim · Accepted Answer · 2016-06-10 07:55:20Z

Maybe you can do that like this.

YourAPIService

@Multipart @POST("api/image/upload") Call<ImageUploadResponse> uploadImage(@Part("photos") List<RequestBody> imageFiles);

YourActivity

//prepare request body List<RequestBody> images = new ArrayList<>(); for (int i = 0; i < filePath.size(); i++){ RequestBody file = RequestBody.create(MediaType.parse("image/*"), filePath.get(i); images.add(file); } //call api Call<ImageUploadResponse> call = imageUploadService.uploadImage(images); call.enqueue(new Callback<ImageUploadResponse>() { @Override public void onResponse(Call<ImageUploadResponse> call, Response<ImageUploadResponse> response) { } @Override public void onFailure(Call<ImageUploadResponse> call, Throwable t) { } });

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