Retrofit2 上传图片等文件

//创建表单的普通字段
public static RequestBody createFormBody(String content) {
　　RequestBody body = RequestBody.create(MediaType.parse("multipart/form-data"), content);
　　return body;
}

//创建Multipart, fieldName为表单字段名
public static MultipartBody.Part createFilePart(String fieldName, File file) {
　　RequestBody requestFile = RequestBody.create(MediaType.parse("application/otcet-stream"), file);
　　MultipartBody.Part body = MultipartBody.Part.createFormData(fieldName, file.getName(), requestFile);
   return body;
}

//Service方法, 普通form表单使用RequestBody, 并且@Part注解要写表单字段名
//文件用MultipartBody.Part
@Multipart
@POST(API.VIDEO_MODULE_UPLOAD_VIDEO)
Call<Object> uploadImage(@Part MultipartBody.Part imagePicFile,
                         @Part MultipartBody.Part videoFile,
                         @Part("videoDescription") RequestBody desc,
                         @Part("videoPicWidth") RequestBody videoPicWidth,
                         @Part("videoPicHeight") RequestBody videoPicHeight);
   

//上传
getService(VideoService.class).uploadVideo(
                createFilePart("videoPicFile",new File(mCoverPath)),
                createFilePart("videoFile",new File(mPath)),
                createFormBody(etVideoDesc.getText().toString().trim()),
                createFormBody(width),
                createFormBody(height))
                .enqueue(new JsonResultCallback<Object>(context()) {
                    @Override
                    public void onSuccess(Call<Object> call, Object data) {
                        super.onSuccess(call, data);
                        //.....
                    }
                    @Override
                    public void onFinish(Call<Object> call) {
                        //...
                    }
                });