使用Retrofit API的MalformedJsonException？

Question

我需要发送一个json到我的webservice,json是:

{
    "Sala": {
        "usuario": "%@",
        "adversario": "%@",
        "atualizacao": "%@",
        "device": "%@",
        "device_tipo": "ios"
    }
}

.我正在尝试使用Retrofit API 1.8.当我尝试发送帖子时抛出一个异常.

例外:

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 7 path $

我正在尝试这个

public class ChatObject {
    private String usuario;
    private String adversario;
    private String atualizacao;
    private String email;
    private String device;
    private String device_tipo;

改造界面

@POST("/WsChat/interacao.json")
    public void onReceiveMessage(@Body ChatObject obj,
                                 Callback<JsonElement> response);

器物

public void receiveMessage(){
    ///{\"Sala\":{\"usuario\":\"%@\",\"adversario\":\"%@\",\"atualizacao\":\"%@\",\"device\":\"%@\",\"device_tipo\":\"ios\"}}
    ChatObject chatObject = new ChatObject(BatalhaConfigs.USUARIO_EMAIL,
                                           BatalhaConfigs.ADVERSARIO_EMAIL,
                                           new Date().toString(),
                                           BatalhaConfigs.USUARIO_EMAIL,
                                           AndroidReturnId.getAndroidId(),
                                           "android");

    RestAdapter adapter = new RestAdapter.Builder()
            .setLogLevel(RestAdapter.LogLevel.FULL)
            .setRequestInterceptor(new CustomRequestInterceptor())
            .setEndpoint(END_POINT)
            .build();
    ChatListener listener = adapter.create(ChatListener.class);
    listener.onReceiveMessage(chatObject, new Callback<JsonElement>() {
        @Override
        public void success(JsonElement jsonElement, retrofit.client.Response response) {
            Log.i("JSON ELEMENT->", jsonElement.toString());
        }

        @Override
        public void failure(RetrofitError error) {
            Log.i("FALHOU->", error.getLocalizedMessage());

        }
    });
}

Answer 1

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true)当有一些字符使JSON格式错误时,通常会抛出.异常消息本身建议使反序列化更容忍.

但我建议你修复你的JSON,并从不需要的字符修剪它.

您应该扩展GsonConverter 并覆盖fromBody()以Gson从容错中读取JsonReader.然后把它设置为你的RestAdapter.JsonReader如果没有抛出异常,这将尝试使用tolerant 来反序列化然后关闭它.

public class LenientGsonConverter extends GsonConverter {
private Gson mGson;

public LenientGsonConverter(Gson gson) {
    super(gson);
    mGson = gson;
}

public LenientGsonConverter(Gson gson, String charset) {
    super(gson, charset);
    mGson = gson;
}

@Override
public Object fromBody(TypedInput body, Type type) throws ConversionException {
    boolean willCloseStream = false; // try to close the stream, if there is no exception thrown using tolerant  JsonReader
    try {
        JsonReader jsonReader = new JsonReader(new InputStreamReader(body.in()));
        jsonReader.setLenient(true);
        Object o = mGson.fromJson(jsonReader,type);
        willCloseStream = true;
        return o;
    } catch (IOException e) {
        e.printStackTrace();
    }finally {
        if(willCloseStream) {
            closeStream(body);
        }
    }

    return super.fromBody(body, type);
}

private void closeStream(TypedInput body){
        try {
            InputStream in = body.in();
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

}

Answer 2

看起来它与Retrofit 2.0略有不同

我是这样做的:

 Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://whatever.com")
        .addConverterFactory(LenientGsonConverterFactory.create(gson))
        .build();

一个新的宽松gson工厂:

public final class LenientGsonConverterFactory extends Converter.Factory {

        /**
         * Create an instance using a default {@link Gson} instance for conversion. Encoding to JSON and
         * decoding from JSON (when no charset is specified by a header) will use UTF-8.
         */
        public static LenientGsonConverterFactory create() {
            return create(new Gson());
        }

        /**
         * Create an instance using {@code gson} for conversion. Encoding to JSON and
         * decoding from JSON (when no charset is specified by a header) will use UTF-8.
         */
        public static LenientGsonConverterFactory create(Gson gson) {
            return new LenientGsonConverterFactory(gson);
        }

        private final Gson gson;

        private LenientGsonConverterFactory(Gson gson) {
            if (gson == null) throw new NullPointerException("gson == null");
            this.gson = gson;
        }

        @Override
        public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations,
                                                                Retrofit retrofit) {
            TypeAdapter<?> adapter = gson.getAdapter(TypeToken.get(type));
            return new LenientGsonResponseBodyConverter<>(gson, adapter);
        }

        @Override
        public Converter<?, RequestBody> requestBodyConverter(Type type,
                                                              Annotation[] parameterAnnotations, Annotation[] methodAnnotations, Retrofit retrofit) {
            TypeAdapter<?> adapter = gson.getAdapter(TypeToken.get(type));
            return new LenientGsonRequestBodyConverter<>(gson, adapter);
        }

    }

宽容解析回复:

    private class LenientGsonResponseBodyConverter<T> implements Converter<ResponseBody, T> {
        private final Gson gson;
        private final TypeAdapter<T> adapter;

        LenientGsonResponseBodyConverter(Gson gson, TypeAdapter<T> adapter) {
            this.gson = gson;
            this.adapter = adapter;
        }

        @Override
        public T convert(ResponseBody value) throws IOException {
            JsonReader jsonReader = gson.newJsonReader(value.charStream());
            jsonReader.setLenient(true);
            try {
                return adapter.read(jsonReader);
            } finally {
                value.close();
            }
        }
    }

宽容创建请求:

   private class LenientGsonRequestBodyConverter<T> implements Converter<T, RequestBody> {
        private static final MediaType MEDIA_TYPE = MediaType.parse("application/json; charset=UTF-8");
        private static final Charset UTF_8 = Charset.forName("UTF-8");

        private final Gson gson;
        private final TypeAdapter<T> adapter;

        LenientGsonRequestBodyConverter(Gson gson, TypeAdapter<T> adapter) {
            this.gson = gson;
            this.adapter = adapter;
        }

        @Override
        public RequestBody convert(T value) throws IOException {
            Buffer buffer = new Buffer();
            Writer writer = new OutputStreamWriter(buffer.outputStream(), UTF_8);
            JsonWriter jsonWriter = gson.newJsonWriter(writer);
            jsonWriter.setLenient(true);
            adapter.write(jsonWriter, value);
            jsonWriter.close();
            return RequestBody.create(MEDIA_TYPE, buffer.readByteString());
        }
    }

我刚刚复制了Retrofit源代码并在请求和响应转换器中添加了一行 jsonWriter.setLenient(true);

甚至更容易:

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

    Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://whatever.com")
        .addConverterFactory(GsonConverterFactory.create(gson))
        .build();