Retrofit API 出现 MalformedJsonException？

问题描述 投票：0回答：8

我需要发送一个json到我的网络服务，json是：

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

。我正在尝试使用 Retrofit API 1.8 来完成此操作。 当我尝试发送帖子时抛出异常。

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);

实施

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());

        }
    });
}
android json gson retrofit
8个回答
15
投票
当存在某些字符导致 JSON 格式错误时，通常会抛出 

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true)
。异常消息本身建议使反序列化更加宽容。

但我建议您修复 JSON 并删除不需要的字符。

您应该扩展 

GsonConverter
并覆盖 
fromBody()
以使 
Gson
从宽容的 
JsonReader
读取。然后将其设置为您的
RestAdapter
。这将尝试使用宽容的
JsonReader
来反序列化然后关闭它，如果没有抛出异常。 

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();
        }
    }
}

}

15
投票

Retrofit 2.0 似乎略有改变

我是这样做的：

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

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);
        }

    }

响应的宽松解析：

    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();
            }
        }
    }

宽松的请求创建：

   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，并向请求和响应转换器添加了一行

jsonWriter.setLenient(true);

或者更简单：

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

    Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://whatever.com")
        .addConverterFactory(GsonConverterFactory.create(gson))
        .build();
1
投票
 RestAdapter adapterRfqPost = new RestAdapter.Builder()
                                    .setEndpoint(Constants.ENDPOINT)
                                            `enter code here`.setConverter(new ConstantsMethods.StringConverter())
                                    .build();

public static class StringConverter implements Converter {
        @Override
        public Object fromBody(TypedInput typedInput, Type type) throws ConversionException {
            String text = null;
            try {
                text = fromStream(typedInput.in());
            } catch (IOException ignored) {/*NOP*/ }
            return text;
        }

        @Override
        public TypedOutput toBody(Object o) {
            return null;
        }

        public static String fromStream(InputStream in) throws IOException {
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            StringBuilder out = new StringBuilder();
            String newLine = System.getProperty("line.separator");
            String line;
            while ((line = reader.readLine()) != null) {
                out.append(line);
                out.append(newLine);
            }
            return out.toString();
        }
    }
0
投票

我花了一天的时间才遇到这个错误，并按照本页的“正确答案”进行操作，但毕竟我找到了我的问题，那就是从“int”数组（也是我的模型类）分配响应是 int) 到 textView，这当然需要我将其转换为字符串 int 值。在我的例子中，我什至根本不需要做@Nikola Despotoski 的解决方案。

0
投票

下面的代码对我有用

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

final RestAdapter restAdapter = new RestAdapter.Builder()
        .setEndpoint(endPoint)
        .setConverter(new GsonConverter(gson))
        .build();

要使用“.setLenient()”，需要将以下行添加到应用程序的gradle文件中。

实现“com.google.code.gson:gson:2.7”

0
投票

如果您使用 PHP 作为 API，请检查它是否回显 只能使用 JSON 编码的对象，否则会抛出此类异常

0
投票

我在 Kotlin 项目中遇到了同样的 MalformedJsonException 问题，发现这里提到的解决方案都不适合我。

通过将 Kotlin 的序列化功能引入到我的项目中，该问题得到了解决。这就是我所做的：

1。添加

@Serializable
注释：

对于

Kotlin
：

@Serializable
data class MyDataClass(...)

对于

Java

import java.io.Serializable;
public class MyDataClass implements Serializable {}

2。更新 

Kotlin
的依赖关系：

// build.gradle (Module)
implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.0")

// build.gradle (Project)
kotlin("jvm") version "1.9.22" // update version
kotlin("plugin.serialization") version "1.9.22" // update version

如果您面临类似的问题并且尚未探索 

Kotlin
或 
Java
序列化功能，我建议您尝试一下。

-12
投票

你应该帮助这个代码：

RestAdapter restAdapter = new RestAdapter.Builder()
                 .setEndpoint("http://192.168.10.115/test.php")
                 .setConverter(new GsonConverter(new Gson()))
                 .build();

放入jar文件：

[gson-2.2.2.jar][1]
最新问题
© www.soinside.com 2019 - 2024. All rights reserved.