RequestBody 在附加文件而不是字符串数据时始终为空

Question

我正在使用 Retrofit 2.5 版，我已经查看了所有相关文档和问题，但我还没有找到任何解决方案。这里的问题是，附加文件后，文件的 RequestBody 总是变为空。这里我附上了我的代码，请看看这个-

          final RequestBody msgbody = RequestBody.create(MediaType.parse("text/plain"), messege);
                final RequestBody idbody = RequestBody.create(MediaType.parse("text/plain"), String.valueOf(id));
                //map.put("userId", idbody);
                //map.put("message", msgbody);
                RequestBody fbody = null;
                if (fileUri!=null) {
                    String path = FileUtils.getPath(getContext(),fileUri);
                    File file = new File(path);
                    fbody = RequestBody.create(MediaType.parse(getContext().getContentResolver().getType(fileUri)), file);
                    //RequestBody body = RequestBody.create(MediaType.parse("*/*"), file);
                    //fbody = MultipartBody.Part.createFormData("file", file.getName(), body);
                    Log.e("SUPPORT",path+" body:"+new Gson().toJson(fbody));
                    //map.put("file\"; filename=\""+file.getName()+"\"",body);
                }

                Call<SubmitTicket> call = mInterface.issueTicket(idbody,msgbody,fbody);
                Log.e("SUPPORT",new Gson().toJson(call));
                call.enqueue(new Callback<SubmitTicket>() {
                    @Override
                    public void onResponse(Call<SubmitTicket> call, Response<SubmitTicket> response) {
                        loadingBar.setVisibility(View.GONE);
                        submitBtn.setEnabled(true);
                   }
                   @Override
                   public void onFailure(Call<ResponseModel> call, Throwable t) {
                      t.printStackTrace();
                      Log.i("Error :",t.getCause()+"");
                      Log.i("Error :","T");
                      finish();
                   } //error even before compile**
            });

这里是接口代码，

@Multipart
@POST("Support")
//Call<SubmitTicket> issueTicket(@PartMap Map<String, RequestBody> params);
Call<SubmitTicket> issueTicket(@Part("userId") RequestBody id, @Part("message") RequestBody messege, @Part("image\"; filename=\"myfile.jpg\" ") RequestBody file);

感谢所有答案和cmets。

Answer 1

我遇到了同样的问题，所以我所做的是更改代码的这个“fbody”部分并添加一个自定义方法来返回 Multipart 主体：

      final RequestBody msgbody = RequestBody.create(MediaType.parse("text/plain"), messege);
            final RequestBody idbody = RequestBody.create(MediaType.parse("text/plain"), String.valueOf(id));
            //map.put("userId", idbody);
            //map.put("message", msgbody);
            MultipartBody.Part fbody = null;
            if (fileUri != null) {
                Log.e("SUPPORT",path+" body:"+new Gson().toJson(fbody));
                fbody = prepareFilePart("img", fileUri);
                //map.put("file\"; filename=\""+file.getName()+"\"",body);
            }

            Call<SubmitTicket> call = mInterface.issueTicket(idbody,msgbody,fbody);
            Log.e("SUPPORT",new Gson().toJson(call));
            call.enqueue(new Callback<SubmitTicket>() {
                @Override
                public void onResponse(Call<SubmitTicket> call, Response<SubmitTicket> response) {
                    loadingBar.setVisibility(View.GONE);
                    submitBtn.setEnabled(true);
               }
               @Override
               public void onFailure(Call<ResponseModel> call, Throwable t) {
                  t.printStackTrace();
                  Log.i("Error :",t.getCause()+"");
                  Log.i("Error :","T");
                  finish();
               } //error even before compile**
        });

我在这里添加了一种创建表单数据的方法：

@NonNull
private MultipartBody.Part prepareFilePart(String partName, Uri fileUri) {
    File file = FileUtils.getFile(this, fileUri);
    // create RequestBody instance from file
    RequestBody requestFile = RequestBody.create(file, MediaType.parse("image/jpeg"));
    // MultipartBody.Part is used to send also the actual file name
    return MultipartBody.Part.createFormData(partName, file.getName(), requestFile);
}

Answer 2

首先你需要改变你的界面。不要使用@Part RequestBody file，而是使用@Part MultipartBody.Part file，如下所示-

@Multipart
@POST("Support")
Call<SubmitTicket> issueTicket(@Part("userId") RequestBody id, @Part("message") RequestBody messege, @Part MultipartBody.Part  image);

然后在您的请求部分使用 Mulitpart.Part 正文而不是 RequestBody 作为 跟随 -

MultipartBody.Part fbody = null;
                if (fileUri!=null) {
                    String path = FileUtils.getPath(getContext(),fileUri);
                    File file = new File(path);
                    //here **image** is your remote file param name
                    fbody = MultipartBody.Part.createFormData("image", file.getName()+System.currentTimeMillis(), RequestBody.create(MediaType.parse("image/*"), file));

                    Log.e("SUPPORT",path+" body:"+new Gson().toJson(fbody));
                    //map.put("file\"; filename=\""+file.getName()+"\"",body);
                }

Answer 3

使用这个，这对你有帮助。您需要以 Multipart 表单数据发送文件。

您的界面将如下所示：

 @Multipart
 @POST("Support")
 Call<SubmitTicket> issueTicket(@Part("userId") RequestBody id, @Part("message") RequestBody messege, @Part MultipartBody.Part file);

你的请求会是这样的：

  RequestBody msgbody = RequestBody.create(MediaType.parse("text/plain"), "yourMessage");
        RequestBody idbody = RequestBody.create(MediaType.parse("text/plain"), "id");


        if (fileUri!=null) {
            String path = FileUtils.getPath(getContext(),fileUri);
            File file = new File(path);

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

            MultipartBody.Part body =
                    MultipartBody.Part.createFormData("file", file.getName(), requestFile);



        Call<SubmitTicket> call = mInterface.issueTicket(idbody,msgbody,body);
        Log.e("SUPPORT",new Gson().toJson(call));
        call.enqueue(new Callback<SubmitTicket>() {
            @Override
            public void onResponse(Call<SubmitTicket> call, Response<SubmitTicket> response) {
                loadingBar.setVisibility(View.GONE);
                submitBtn.setEnabled(true);
            }
            @Override
            public void onFailure(Call<ResponseModel> call, Throwable t) {
                t.printStackTrace();
                Log.i("Error :",t.getCause()+"");
                Log.i("Error :","T");
                finish();
            } //error even before compile**
        });

        }

这总是在帮助我。希望这些对您和其他人也有用。