java - 改造图片上传无法处理实体错误

Question

我正在使用改进的多部分 api 上传图像。我在 postman 中取得了成功，但在代码中出现以下错误:

Response{protocol=http/1.1, code=422, message=Unprocessable Entity, url=http://upload-snack.13.251.251.232.nip.io/upload}

postman :

改造代码:

请求:

 @Multipart
    @POST("upload")
    Call<ResponseBody> uploadImage(@Part MultipartBody.Part image);

界面:

 public static Retrofit getRetrofitClient(Context context, String baseURL) {
        if (retrofit == null) {
            OkHttpClient okHttpClient = new OkHttpClient.Builder()
                    .build();
            retrofit = new Retrofit.Builder()
                    .baseUrl(baseURL)
                    .client(okHttpClient)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }

Activity 类代码:

 private void uploadToServer(String filePath) {
        Retrofit retrofit = ServiceGenerator.getRetrofitClient(this, "http://upload-snack.13.251.251.232.nip.io/");
        Api uploadAPIs = retrofit.create(Api.class);
        //Create a file object using file path
        File file = new File(filePath);
        // Create a request body with file and image media type
        RequestBody fileReqBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
        // Create MultipartBody.Part using file request-body,file name and part name
        MultipartBody.Part part = MultipartBody.Part.createFormData("image", file.getName(), fileReqBody);
        //Create request body with text description and text media type
       // RequestBody description = RequestBody.create(MediaType.parse("text/plain"), "image-type");
        //
        Call call = uploadAPIs.uploadImage(part);
        call.enqueue(new Callback() {
            @Override
            public void onResponse(Call call, Response response) {
                Log.e("response", response.toString());
            }

            @Override
            public void onFailure(Call call, Throwable t) {
                Log.e("failure", "failure");
            }
        });
    }

我已经检查了以下教程/答案，但没有任何效果:

• https://android.jlelse.eu/working-with-retrofit-825d30348fe2
• https://inducesmile.com/android/android-upload-image-to-server-using-retrofit-2/
• image upload using multipart retrofit 2
• Upload image into server using retrofit
• https://www.simplifiedcoding.net/retrofit-upload-file-tutorial/
• https://www.journaldev.com/23738/android-multipart-image-upload-progress-retrofit-nodejs
• Image upload using retrofit
• How to Upload Image file in Retrofit 2
• Retrofit 2 Multipart image upload with data
• POST Multipart Form Data using Retrofit 2.0 including image
• Retrofit Uploading multiple images to a single key

还有更多......

但仍然无法正常工作。请帮忙

Answer 1

更改媒体类型 image/* multipart/form-data 实例。我想这会对你有帮助。

 File file = new File(filePath);
    // Create a request body with file and image media type
    RequestBody fileReqBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
    // Create MultipartBody.Part using file request-body,file name and part name
    MultipartBody.Part part = MultipartBody.Part.createFormData("image", file.getName(), fileReqBody);