Разбор JSON с gson - сокет закрыт при разборе - PullRequest
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Разбор JSON с gson - сокет закрыт при разборе

1 голос
/ 23 марта 2020

Я пытаюсь разобрать JSON, как в этом фрагменте, используя gson: 

{
"cod":"200",
"message":0,
"cnt":40,
"list":[
{"dt":1584565200,"main":{"temp":284.22,"feels_like":279.95,"temp_min":282.33,"temp_max":284.22,"pressure":1021,"sea_level":1021,"grnd_level":1011,"humidity":81,"temp_kf":1.89},"weather":[{"id":804,"main":"Clouds","description":"overcast clouds","icon":"04n"}],"clouds":{"all":100},"wind":{"speed":5.42,"deg":275},"sys":{"pod":"n"},"dt_txt":"2020-03-18 21:00:00"},
{"dt":1584576000,"main":{"temp":282.97,"feels_like":279.59,"temp_min":281.55,"temp_max":282.97,"pressure":1021,"sea_level":1021,"grnd_level":1011,"humidity":88,"temp_kf":1.42},"weather":[{"id":500,"main":"Rain","description":"light rain","icon":"10n"}],"clouds":{"all":100},"wind":{"speed":4.14,"deg":273},"rain":{"3h":0.44},"sys":{"pod":"n"},"dt_txt":"2020-03-19 00:00:00"},
{"dt":1584586800,"main":{"temp":281.44,"feels_like":277.55,"temp_min":280.5,"temp_max":281.44,"pressure":1020,"sea_level":1020,"grnd_level":1010,"humidity":87,"temp_kf":0.94},"weather":[{"id":500,"main":"Rain","description":"light rain","icon":"10n"}],"clouds":{"all":100},"wind":{"speed":4.33,"deg":286},"rain":{"3h":0.81},"sys":{"pod":"n"},"dt_txt":"2020-03-19 03:00:00"},
{"dt":1584597600,"main":{"temp":279.82,"feels_like":276.13,"temp_min":279.35,"temp_max":279.82,"pressure":1021,"sea_level":1021,"grnd_level":1011,"humidity":89,"temp_kf":0.47},"weather":[{"id":500,"main":"Rain","description":"light rain","icon":"10d"}],"clouds":{"all":100},"wind":{"speed":3.66,"deg":311},"rain":{"3h":0.56},"sys":{"pod":"d"},"dt_txt":"2020-03-19 06:00:00"}]

На самом деле это намного длиннее, он имеет приблизительно 15 000 символов. Все, что мне нужно, это временные, дневные, дождевые или снежные осадки, поэтому я создал классы ниже: ForecastParams. java

import java.util.List;

public class ForecastParams {
    public List<_List> list;
}

_List. java

import java.util.List;

public class _List {
    public long dt;

    public Main main;

    public Rain rain;

    public Snow snow;
}

Main. java

public class Main {
    public double temp;
    public double feels_like;
    public double temp_min;
    public double temp_max;
    public int pressure;
    public int humidity;
}

Дождь. java

public class Rain {
    @SerializedName("3h")
    public double rainPrep;
}

Снег. java

public class Snow {
    @SerializedName("3h")
    public double snowPrep;
}

Я использую AsyncTask для получения json с сервера и последующего его анализа (в основной деятельности): 

private class getForecastData extends AsyncTask<String, Void, Reader>{
        private Reader json;

        @Override
        protected Reader doInBackground(String... urls){
            try{
                json = RestAPIService.getStream(urls[0]);
            }catch (Exception e){
                e.printStackTrace();
            }

            return json;
        }

        @Override
        protected void onPostExecute(Reader json){
            try{
                Gson gson = new Gson();
                ForecastParams response = gson.fromJson(json, ForecastParams.class);
                List<_List> forecastList = response.list;
                double temp = 0;
                List<Long> dayTime = new ArrayList<>();
                List<Double> temps = new ArrayList<>();
                List<Double> rainPrep = new ArrayList<>();
                List<Double> snowPrep = new ArrayList<>();

                for (_List weather : forecastList){
                    dayTime.add(weather.dt);
                    temps.add(weather.main.temp);
                    rainPrep.add(weather.rain.rainPrep);
                    snowPrep.add(weather.snow.snowPrep);
                }

                setDtList(dayTime);
                setTempsList(temps);                
                setRainPrepList(rainPrep);
                setSnowPrepList(snowPrep);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

getStream имеет вид: 

static Reader getStream(String url) throws IOException {
    URL obj = new URL(url);
    HttpURLConnection connection = (HttpURLConnection)obj.openConnection();
    InputStream resBody;
    connection.setRequestMethod("GET");
    int responseCode = connection.getResponseCode();

    if (responseCode == HttpURLConnection.HTTP_OK) {
       resBody = connection.getInputStream();
    } else
        return null;

    connection.disconnect();

    Reader resBodyReader = new InputStreamReader(resBody, "UTF-8");

    return resBodyReader;
}

При запуске приложения я получаю следующую трассировку стека: 

W/System.err: android.os.NetworkOnMainThreadException
        at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1513)
        at java.net.SocketInputStream.read(SocketInputStream.java:175)
        at java.net.SocketInputStream.read(SocketInputStream.java:144)
        at com.android.okhttp.okio.Okio$2.read(Okio.java:136)
W/System.err:     at com.android.okhttp.okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
        at com.android.okhttp.okio.RealBufferedSource.read(RealBufferedSource.java:50)
        at com.android.okhttp.internal.http.Http1xStream$FixedLengthSource.read(Http1xStream.java:393)
        at com.android.okhttp.okio.RealBufferedSource$1.read(RealBufferedSource.java:371)
        at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:288)
        at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:351)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:180)
        at java.io.InputStreamReader.read(InputStreamReader.java:184)
        at com.google.gson.stream.JsonReader.fillBuffer(JsonReader.java:1291)
        at com.google.gson.stream.JsonReader.skipQuotedValue(JsonReader.java:1119)
        at com.google.gson.stream.JsonReader.skipValue(JsonReader.java:1253)
W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220)
        at com.google.gson.Gson.fromJson(Gson.java:932)
        at com.google.gson.Gson.fromJson(Gson.java:870)
        at com.pklos.myweather.MainActivity$getForecastData.onPostExecute(MainActivity.java:243)
        at com.pklos.myweather.MainActivity$getForecastData.onPostExecute(MainActivity.java:202)
        at android.os.AsyncTask.finish(AsyncTask.java:695)
        at android.os.AsyncTask.access$600(AsyncTask.java:180)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

Когда я включаю StrictMode следующим образом (в методе onCreate): 

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

Я получаю трассировку стека следующим образом (сокет закрыт): 

W/System.err: com.google.gson.JsonSyntaxException: java.net.SocketException: Socket closed
        at com.google.gson.Gson.fromJson(Gson.java:947)
        at com.google.gson.Gson.fromJson(Gson.java:870)
        at com.pklos.myweather.MainActivity$getForecastData.onPostExecute(MainActivity.java:243)
        at com.pklos.myweather.MainActivity$getForecastData.onPostExecute(MainActivity.java:202)
        at android.os.AsyncTask.finish(AsyncTask.java:695)
        at android.os.AsyncTask.access$600(AsyncTask.java:180)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
        at android.os.Handler.dispatchMessage(Handler.java:106)
W/System.err:     at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
    Caused by: java.net.SocketException: Socket closed
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.socketRead(SocketInputStream.java:119)
        at java.net.SocketInputStream.read(SocketInputStream.java:176)
W/System.err:     at java.net.SocketInputStream.read(SocketInputStream.java:144)
        at com.android.okhttp.okio.Okio$2.read(Okio.java:136)
        at com.android.okhttp.okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
        at com.android.okhttp.okio.RealBufferedSource.read(RealBufferedSource.java:50)
        at com.android.okhttp.internal.http.Http1xStream$FixedLengthSource.read(Http1xStream.java:393)
        at com.android.okhttp.okio.RealBufferedSource$1.read(RealBufferedSource.java:371)
W/System.err:     at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:288)
        at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:351)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:180)
        at java.io.InputStreamReader.read(InputStreamReader.java:184)
        at com.google.gson.stream.JsonReader.fillBuffer(JsonReader.java:1291)
        at com.google.gson.stream.JsonReader.nextQuotedValue(JsonReader.java:1031)
        at com.google.gson.stream.JsonReader.nextName(JsonReader.java:788)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:217)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:82)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
W/System.err:     at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
        at com.google.gson.Gson.fromJson(Gson.java:932)
        ... 12 more

Мой вопрос: почему сокет закрыт? Я смущен тем, что приложение уже загрузило json с сервера. Таким же образом я анализирую другой JSON (около 500 символов), и он работает правильно. Здесь важен объем информации? Или, может быть, классы, обрабатывающие информацию из JSON, написаны неправильно? Есть ли другой способ справиться с этой проблемой?

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