老師講的類已經被不用了，對于新的okhttp3.5.0，上傳表單帶圖片怎么圖片一直傳布上去，也看了okhttp3.x的demo

public?void?doUpload(View?view)?{

????File?file?=?new?File(Environment.getExternalStorageDirectory(),?"2.jpg");
????if?(!file.exists())?{
????????L.e(file.getAbsolutePath()?+?"not?exist!");
????}


????RequestBody?requestBody?=?new?MultipartBody.Builder()
????????????.setType(MultipartBody.FORM)
????????????.addFormDataPart("username",?"xiaoqiang")
????????????.addFormDataPart("password",?"123")
????????????.addFormDataPart("mPhoto",?"2.jpg",?RequestBody.create(MediaType.parse("image/jpeg"),?file))
????????????.build();

????Request?request?=?new?Request.Builder()
????????????.url(BaseUrl?+?"uploadInfo")
????????????.post(requestBody)
????????????.build();
????executeRequest(request);
}

這個是我寫的，可是一直報錯，在服務端圖片接收不到，圖片是按老師寫的