Retrofit 2.0 cara mendapatkan respons kesalahan deserialised

Saya menggunakan Retrofit 2.0.0-beta1 .

Dalam tes saya punya skenario alternatif dan mengharapkan kesalahan HTTP 400

Saya ingin memiliki retrofit.Response<MyError> response tetapiresponse.body() == null

MyError tidak di-deserialisasi - saya hanya melihatnya di sini

response.errorBody().string()

tetapi itu tidak memberi saya MyError sebagai objek

Saat ini saya menggunakan implementasi yang sangat mudah, yang tidak perlu menggunakan konverter atau kelas khusus. Kode yang saya gunakan adalah sebagai berikut:

public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
    DialogHelper.dismiss();

    if (response.isSuccessful()) {
        // Do your success stuff...
    } else {
        try {
            JSONObject jObjError = new JSONObject(response.errorBody().string());
            Toast.makeText(getContext(), jObjError.getJSONObject("error").getString("message"), Toast.LENGTH_LONG).show();
        } catch (Exception e) {
            Toast.makeText(getContext(), e.getMessage(), Toast.LENGTH_LONG).show();
        }
    }
}

ErrorResponse adalah objek respons khusus Anda

Kotlin

val gson = Gson()
val type = object : TypeToken<ErrorResponse>() {}.type
var errorResponse: ErrorResponse? = gson.fromJson(response.errorBody()!!.charStream(), type)

Jawa

Gson gson = new Gson();
Type type = new TypeToken<ErrorResponse>() {}.getType();
ErrorResponse errorResponse = gson.fromJson(response.errorBody.charStream(),type);

Saya menyelesaikannya dengan:

 if(!response.isSuccessful()){
       Gson gson = new Gson();
       MyErrorMessage message=gson.fromJson(response.errorBody().charStream(),MyErrorMessage.class);
       if(message.getCode()==ErrorCode.DUPLICATE_EMAIL_ID_CODE){
                  //DO Error Code specific handling                        
        }else{
                 //DO GENERAL Error Code Specific handling                               
        }
    }

Kelas MyErrorMessage:

  public class MyErrorMessage {
     private int code;
     private String message;

     public int getCode() {
        return code;
     }

     public void setCode(int code) {
        this.code = code;
     }

     public String getMessage() {
         return message;
     }

     public void setMessage(String message) {
        this.message = message;
     }
   }

Di Retrofit 2.0 beta2 inilah cara saya mendapatkan respons kesalahan:

1. Sinkronis

   try {
      Call<RegistrationResponse> call = backendServiceApi.register(data.in.account, data.in.password,
              data.in.email);
      Response<RegistrationResponse> response = call.execute();
      if (response != null && !response.isSuccess() && response.errorBody() != null) {
          Converter<ResponseBody, BasicResponse> errorConverter =
                  MyApplication.getRestClient().getRetrofitInstance().responseConverter(BasicResponse.class, new Annotation[0]);
          BasicResponse error = errorConverter.convert(response.errorBody());
          //DO ERROR HANDLING HERE
          return;
      }
      RegistrationResponse registrationResponse = response.body();
      //DO SUCCESS HANDLING HERE
   } catch (IOException e) {
      //DO NETWORK ERROR HANDLING HERE
   }

2. Tidak sinkron

   Call<BasicResponse> call = service.loadRepo();
   call.enqueue(new Callback<BasicResponse>() {
       @Override
       public void onResponse(Response<BasicResponse> response, Retrofit retrofit) {
           if (response != null && !response.isSuccess() && response.errorBody() != null) {
               Converter<ResponseBody, BasicResponse> errorConverter =
                   retrofit.responseConverter(BasicResponse.class, new Annotation[0]);
               BasicResponse error = errorConverter.convert(response.errorBody());
               //DO ERROR HANDLING HERE
               return;
           }
           RegistrationResponse registrationResponse = response.body();
           //DO SUCCESS HANDLING HERE
       }
   
       @Override
       public void onFailure(Throwable t) {
           //DO NETWORK ERROR HANDLING HERE
       }
   });

Pembaruan untuk Retrofit 2 beta3:

1. Sinkron - tidak diubah

2. Asinkron - Parameter retrofit telah dihapus dari onResponse

   Call<BasicResponse> call = service.loadRepo();
   call.enqueue(new Callback<BasicResponse>() {
       @Override
       public void onResponse(Response<BasicResponse> response) {
           if (response != null && !response.isSuccess() && response.errorBody() != null) {
               Converter<ResponseBody, BasicResponse> errorConverter =
                   MyApplication.getRestClient().getRetrofitInstance().responseConverter(BasicResponse.class, new Annotation[0]);
               BasicResponse error = errorConverter.convert(response.errorBody());
               //DO ERROR HANDLING HERE
               return;
           }
           RegistrationResponse registrationResponse = response.body();
           //DO SUCCESS HANDLING HERE
       }
   
       @Override
       public void onFailure(Throwable t) {
           //DO NETWORK ERROR HANDLING HERE
       }
   });

Dalam https://stackoverflow.com/a/21103420/2914140 dan https://futurestud.io/tutorials/retrofit-2-simple-error-handling varian ini ditampilkan untuk Retrofit 2.1.0.

call.enqueue(new Callback<MyResponse>() {
    @Override
    public void onResponse(Call<MyResponse> call, Response<MyResponse> response) {
        if (response.isSuccessful()) {
            ...
        } else {
            Converter<ResponseBody, MyError> converter
                    = MyApplication.getRetrofit().responseBodyConverter(
                    MyError.class, new Annotation[0]);
            MyError errorResponse = null;
            try {
                errorResponse = converter.convert(response.errorBody());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

Buat model respons Galat & pengguna Gson untuk mengonversi respons terhadapnya. Ini hanya akan berfungsi dengan baik.

APIError.java

public class APIError {
    private String message;

    public String getMessage() {
        return message;
    }
}

MainActivity.java (permintaan di dalam onResponse)

if (response.isSuccessful()) {
    // Do your success stuff...

} else {
    APIError message = new Gson().fromJson(response.errorBody().charStream(), APIError.class);
    Toast.makeText(MainActivity.this, "" + message.getMessage(), Toast.LENGTH_SHORT).show();
}

 @Override
 public void onResponse(Call<Void> call, retrofit2.Response<Void> response) {
            if (response.isSuccessful()) {

            //Do something if response is ok
            } else {

                JsonParser parser = new JsonParser();
                JsonElement mJson = null;
                try {
                    mJson = parser.parse(response.errorBody().string());
                    Gson gson = new Gson();
                    MyError errorResponse = gson.fromJson(mJson, MyError.class);
                } catch (IOException ex) {
                    ex.printStackTrace();
                }

            }

Saya melakukannya dengan cara ini untuk panggilan asinkron menggunakan Retrofit 2.0-beta2:

@Override
public void onResponse(Response<RegistrationResponse> response, 
                       Retrofit retrofit) {
    if (response.isSuccess()) {
        // Do success handling here
    } else {
        try {
            MyError myError = (MyError)retrofit.responseConverter(
                    MyError.class, MyError.class.getAnnotations())
                .convert(response.errorBody());
            // Do error handling here
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Jika Anda menggunakan Kotlin solusi lain bisa saja membuat fungsi ekstensi untuk kelas Respons:

inline fun <reified T>Response<*>.parseErrJsonResponse(): T?
{
    val moshi = MyCustomMoshiBuilder().build()
    val parser = moshi.adapter(T::class.java)
    val response = errorBody()?.string()
    if(response != null)
        try {
            return parser.fromJson(response)
        } catch(e: JsonDataException) {
            e.printStackTrace()
        }
    return null
}

Pemakaian

val myError = response.parseErrJsonResponse<MyErrorResponse>()
if(myError != null) {
   // handle your error logic here
   // ...
}

Ini sebenarnya sangat lurus ke depan.

Kotlin:

val jsonObj = JSONObject(response.errorBody()!!.charStream().readText())
responseInterface.onFailure(jsonObj.getString("msg"))

Jawa:

JSONObject jsonObj = new JSONObject(response.errorBody().charStream().readText());
responseInterface.onFailure(jsonObj.getString("msg"));

Diuji pada retrofit: 2.5.0. Baca teks dari charStream yang akan memberi Anda String, kemudian parse ke JSONObject.

Adios.

Saya menghadapi masalah yang sama. Saya menyelesaikannya dengan retrofit. Biarkan saya tunjukkan ini ...

Jika struktur JSON kesalahan Anda seperti

{
"error": {
    "status": "The email field is required."
}
}


My ErrorRespnce.java 

public class ErrorResponse {

   @SerializedName("error")
   @Expose
   private ErrorStatus error;

   public ErrorStatus getError() {
      return error;
   }

   public void setError(ErrorStatus error) {
      this.error = error;
   }
}

Dan ini kelas status Kesalahan saya

public class ErrorStatus {

  @SerializedName("status")
  @Expose
  private String status;

  public String getStatus() {
      return status;
  }

  public void setStatus(String status) {
      this.status = status;
  }
}

Sekarang kita membutuhkan kelas yang dapat menangani json kita.

  public class ErrorUtils {

   public static ErrorResponse parseError (Response<?> response){
      Converter<ResponseBody , ErrorResponse> converter =          ApiClient.getClient().responseBodyConverter(ErrorResponse.class , new Annotation[0]);
    ErrorResponse errorResponse;
    try{
        errorResponse = converter.convert(response.errorBody());
    }catch (IOException e){
        return new ErrorResponse();
    }
    return errorResponse;
}
}

Sekarang kita dapat memeriksa respons kita di retrofit api call

private void registrationRequest(String name , String email , String password , String c_password){


    final Call<RegistrationResponce> registrationResponceCall = apiInterface.getRegistration(name , email , password , c_password);
    registrationResponceCall.enqueue(new Callback<RegistrationResponce>() {
        @Override
        public void onResponse(Call<RegistrationResponce> call, Response<RegistrationResponce> response) {



            if (response.code() == 200){


            }else if (response.code() == 401){


                ErrorResponse errorResponse = ErrorUtils.parseError(response);
                Toast.makeText(MainActivity.this, ""+errorResponse.getError().getStatus(), Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onFailure(Call<RegistrationResponce> call, Throwable t) {

        }
    });
}

Itu saja sekarang Anda dapat menunjukkan Toast Anda

Berikut adalah solusi elegan menggunakan Kotlinekstensi:

data class ApiError(val code: Int, val message: String?) {
    companion object {
        val EMPTY_API_ERROR = ApiError(-1, null)
    }
}

fun Throwable.getApiError(): ApiError? {
    if (this is HttpException) {
        try {
            val errorJsonString = this.response()?.errorBody()?.string()
            return Gson().fromJson(errorJsonString, ApiError::class.java)
        } catch (exception: Exception) {
            // Ignore
        }
    }
    return EMPTY_API_ERROR
}

dan penggunaan:

showError(retrofitThrowable.getApiError()?.message)

Dengan cara ini Anda tidak perlu instance Retrofit jika Anda hanya menyuntikkan layanan yang dibuat dari Retrofit.

public class ErrorUtils {

  public static APIError parseError(Context context, Response<?> response) {

    APIError error = new APIError();

    try {
        Gson gson = new Gson();
        error = gson.fromJson(response.errorBody().charStream(), APIError.class);
    } catch (Exception e) {
        Toast.makeText(context, e.getMessage(), Toast.LENGTH_LONG).show();
    }

    if (TextUtils.isEmpty(error.getErrorMessage())) {
        error.setError(response.raw().message());
    }
    return error;
  }
}

Gunakan seperti ini:

if (response.isSuccessful()) {

      ...

    } else {

      String msg = ErrorUtils.parseError(fragment.getActivity(), response).getError(); // would be from your error class
      Snackbar.make(someview, msg, Snackbar.LENGTH_LONG).show();
    }
  }

Baca errorBody to a String dan secara manual parse json.

 if(!response.isSuccessful()) {
   
    String error = "";
    try {
        BufferedReader ereader = new BufferedReader(new InputStreamReader(
                response.errorBody().byteStream()));
        String eline = null;
        while ((eline = ereader.readLine()) != null) {
            error += eline + "";
        }
        ereader.close();
    } catch (Exception e) {
        error += e.getMessage();
    }
    Log.e("Error",error);
    
    try {
        JSONObject reader = new JSONObject(error);
        String message = reader.getString("message");
    
        Toast.makeText(context,message,Toast.LENGTH_SHORT).show();
    
    } catch (JSONException e) {
        e.printStackTrace();
    }
 }

Ini tampaknya menjadi masalah ketika Anda menggunakan OkHttp bersama dengan Retrofit, jadi Anda dapat menghapus OkHttp atau menggunakan kode di bawah ini untuk mendapatkan badan kesalahan:

if (!response.isSuccessful()) {
 InputStream i = response.errorBody().byteStream();
 BufferedReader r = new BufferedReader(new InputStreamReader(i));
 StringBuilder errorResult = new StringBuilder();
 String line;
 try {
   while ((line = r.readLine()) != null) {
   errorResult.append(line).append('\n');
   }
 } catch (IOException e) { 
    e.printStackTrace(); 
}
}

diselesaikan dengan:

Converter<MyError> converter = 
    (Converter<MyError>)JacksonConverterFactory.create().get(MyError.class);
MyError myError =  converter.fromBody(response.errorBody());

try{
                ResponseBody response = ((HttpException) t).response().errorBody();
                JSONObject json = new JSONObject( new String(response.bytes()) );
                errMsg = json.getString("message");
            }catch(JSONException e){
                return t.getMessage();
            }
            catch(IOException e){
                return t.getMessage();
            }

Di Kotlin:

val call = APIClient.getInstance().signIn(AuthRequestWrapper(AuthRequest("1234567890z", "12341234", "nonce")))
call.enqueue(object : Callback<AuthResponse> {
    override fun onResponse(call: Call<AuthResponse>, response: Response<AuthResponse>) {
        if (response.isSuccessful) {

        } else {
            val a = object : Annotation{}
            val errorConverter = RentalGeekClient.getRetrofitInstance().responseBodyConverter<AuthFailureResponse>(AuthFailureResponse::class.java, arrayOf(a))
            val authFailureResponse = errorConverter.convert(response.errorBody())
        }
    }

    override fun onFailure(call: Call<AuthResponse>, t: Throwable) {
    }
})

nilai errorBody harus menetapkan objek APIError di Retrofit. Jadi, Anda dapat menggunakan struktur kode di bawah ini.

public class APIErrorUtils {

    public static APIError parseError(Response<?> response) {
        Converter<ResponseBody, APIError> converter = API.getClient().responseBodyConverter(APIError.class, new Annotation[0]);

        APIError error;

        try {
            error = converter.convert(response.errorBody());
            Log.d("SERVICELOG", "****************************************************");
            Log.d("SERVICELOG", "***** SERVICE LOG");
            Log.d("SERVICELOG", "***** TIMESTAMP: " + String.valueOf(error.getTimestamp()));
            Log.d("SERVICELOG", "***** STATUS: " + String.valueOf(error.getStatus()));
            Log.d("SERVICELOG", "***** ERROR: " + error.getError());
            Log.d("SERVICELOG", "***** MESSAGE: " + error.getMessage());
            Log.d("SERVICELOG", "***** PATH: " + error.getPath());
            Log.d("SERVICELOG", "****************************************************");
        } catch (IOException e) {
            return new APIError();
        }

        return error;
    }
}

APIError error = APIErrorUtils.parseError(response);
if (error.getStatus() == 400) {
    ....
}

Diuji dan bekerja

 public BaseModel parse(Response<BaseModel> response , Retrofit retrofit){
            BaseModel error = null;
            Converter<ResponseBody, BaseModel> errorConverter =
                    retrofit.responseBodyConverter(BaseModel.class, new Annotation[0]);
            try {
                if (response.errorBody() != null) {
                    error = errorConverter.convert(response.errorBody());
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            return error;
        }

val error = JSONObject(callApi.errorBody()?.string() as String)
            CustomResult.OnError(CustomNotFoundError(userMessage = error["userMessage"] as String))

open class CustomError (
    val traceId: String? = null,
    val errorCode: String? = null,
    val systemMessage: String? = null,
    val userMessage: String? = null,
    val cause: Throwable? = null
)

open class ErrorThrowable(
    private val traceId: String? = null,
    private val errorCode: String? = null,
    private val systemMessage: String? = null,
    private val userMessage: String? = null,
    override val cause: Throwable? = null
) : Throwable(userMessage, cause) {
    fun toError(): CustomError = CustomError(traceId, errorCode, systemMessage, userMessage, cause)
}


class NetworkError(traceId: String? = null, errorCode: String? = null, systemMessage: String? = null, userMessage: String? = null, cause: Throwable? = null):
    CustomError(traceId, errorCode, systemMessage, userMessage?: "Usted no tiene conexión a internet, active los datos", cause)

class HttpError(traceId: String? = null, errorCode: String? = null, systemMessage: String? = null, userMessage: String? = null, cause: Throwable? = null):
    CustomError(traceId, errorCode, systemMessage, userMessage, cause)

class UnknownError(traceId: String? = null, errorCode: String? = null, systemMessage: String? = null, userMessage: String? = null, cause: Throwable? = null):
    CustomError(traceId, errorCode, systemMessage, userMessage?: "Unknown error", cause)

class CustomNotFoundError(traceId: String? = null, errorCode: String? = null, systemMessage: String? = null, userMessage: String? = null, cause: Throwable? = null):
    CustomError(traceId, errorCode, systemMessage, userMessage?: "Data not found", cause)`