改造图片上传无法处理的实体错误

Posted 2023-03-22

【中文标题】改造图片上传无法处理的实体错误

【英文标题】：Retrofit image upload Unprocessable Entity error

【发布时间】：2020-04-16 13:57:26

【问题描述】：

我正在使用改造多部分 API 上传图像。我在邮递员中取得了成功，但在代码中得到了以下错误：

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

邮递员：

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;
    

活动类代码：

 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");
            
        );
    

我检查了下面的教程/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

【问题讨论】：

我也遇到了同样的问题，请问您找到解决方法了吗？如果有任何解决方案，请告诉我。

@Akshay 需要将媒体类型更改为 image/png 而不是 multipart/form-data。那会奏效的。

@VishvaDave 非常感谢，它现在正在工作。

【参考方案1】：

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

 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);

【讨论】：

你确定键名是“image”

【参考方案2】：

将您的 Retrofit 接口方法更改为此。

public class ServiceGenerator

    private static final String BASE_URL = "base_url";


    public static Retrofit getRetrofitClient() 
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();

        Gson gson = new GsonBuilder()
                .setLenient()
                .create();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .client(client)
                .addConverterFactory(ScalarsConverterFactory.create())
                .addConverterFactory(GsonConverterFactory.create(gson))
                .build();
        return retrofit;
    

【参考方案3】：

我在 Kotlin 中遇到了同样的问题，但感谢 @VishvaDave。于是我就这样做了

val file = File(filePath)
val fileReqBody = RequestBody.create(MediaType.parse("image/png"), file)
val part = MultipartBody.Part.createFormData("image", file.name, fileReqBody)