Retrofit 2:用json对象发送文件

Question

我在请求正文中发送对象,类似于:

{
  "title":"test",
  "description":"test",
  "images":[]
}

@POST("create-data")
Call<JsonObject> publishData(@Body MyObject object);

没有图像,它的工作正常.从文档中我可以找到如何使用文件上传文件MultipartBody.Part,我的问题是:

1. 如何同时上传多张图片？
2. 是否可以将图像发送到对象内部,或者我需要单独发送它以及如何发送？

非常感谢你.

Answer 1

刚刚请求服务器成功

我参考了这篇文章:

https://futurestud.io/blog/retrofit-2-how-to-upload-files-to-server

@Multipart
@POST("uploadHeadPic")
Call<UploadHeadPicResponseModel> uploadHeadPic(@Part MultipartBody.Part file, @Part("json") RequestBody json);

public void doUploadHeadPic(@NonNull String filePath) {
    if (!MNetworkUtil.isNetworkAvailable()) {
        MToastUtil.show("??????");
        return;
    }
    File file = new File(filePath);
    String json = new Gson().toJson(new UploadHeadPicRequestModel());
    if (!file.exists()) {
        MToastUtil.show("?????");
        return;
    }

    progressDialog.show();
    avatarSimpleDraweeView.setEnabled(false);

    MApiManager.getService().uploadHeadPic(
            MultipartBody.Part.createFormData("file", file.getName(), RequestBody.create(MediaType.parse("multipart/form-data"), file)),
            RequestBody.create(MediaType.parse("multipart/form-data"), json))
            .enqueue(new OnRetrofitCallbackListener<UploadHeadPicResponseModel>(mActivity) {
                @Override
                public void onSuccess(UploadHeadPicResponseModel responseModel) {
                    progressDialog.dismiss();
                    avatarSimpleDraweeView.setEnabled(true);
                    if (responseModel != null) {
                        String serverAvatarUrl = responseModel.data.headPicPath;
                        if (!TextUtils.isEmpty(serverAvatarUrl)) {
                            UserModel userModel = MUserManager.getInstance().getUser();
                            if (userModel != null) {
                                userModel.setAvatarUrl(serverAvatarUrl);
                                MUserManager.getInstance().updateOrInsertUserInfo(userModel);
                                MToastUtil.show("??????");
                            }
                        }
                    }
                }

                @Override
                public void onFailure(int status, String failureMsg) {
                    progressDialog.dismiss();
                    avatarSimpleDraweeView.setEnabled(true);
                    MToastUtil.show((TextUtils.isEmpty(failureMsg) ? "????" : failureMsg) + " : " + status);
                }
            });
}

更新多个文件

可能这可能会有所帮助,我没试过

@Multipart
@POST("uploadHeadPic")
Call<UploadHeadPicResponseModel> uploadHeadPic(@Part MultipartBody.Part file0, @Part MultipartBody.Part file1, @Part("json") RequestBody json);

public void doUploadHeadPic(@NonNull String filePath) {
    MApiManager.getService().uploadHeadPic(
            MultipartBody.Part.createFormData("file0", file0.getName(), RequestBody.create(MediaType.parse("multipart/form-data"), file0)),
            MultipartBody.Part.createFormData("file1", file1.getName(), RequestBody.create(MediaType.parse("multipart/form-data"), file1)),
            RequestBody.create(MediaType.parse("multipart/form-data"), json))
            .enqueue(new OnRetrofitCallbackListener<UploadHeadPicResponseModel>(mActivity) {
                @Override
                public void onSuccess(UploadHeadPicResponseModel responseModel) {

                }

                @Override
                public void onFailure(int status, String failureMsg) {
                }
            });
}

Answer 2

在我的情况下(上传到使用Spring构建的服务器)我需要更改MediaType为RequestBody:

RequestBody.create(MediaType.parse("application/json"), json)

RequestBody.create(MediaType.parse("image/jpg"), file)