我正在開發一個Android應用程序。我正在使用改造Gson來調用服務器并序列化/反序列化。在請求中，有一個包含timestamp( long) 的響應類。有時這是double因為iOS應用程序的版本double用于存儲時間戳。有沒有辦法強制Gson反序列化響應并轉換為Response類（長）上存在的對象？例外：Caused by com.google.gson.JsonSyntaxException: java.lang.NumberFormatException: Expected a long but was 1555323142345.364 at line 1 column 1002 path $.userSettings.stories[4].readTimestamp at com.google.gson.internal.bind.TypeAdapters$11.read(TypeAdapters.java:323) at com.google.gson.internal.bind.TypeAdapters$11.read(TypeAdapters.java:313) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:129) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220) 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$1.read(ReflectiveTypeAdapterFactory.java:129) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:129) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220)
1 回答
慕婉清6462132
TA貢獻1804條經驗 獲得超2個贊
為簡單起見，假設您的JSON有效負載是：
{
"timestamp": 1555323142345.345
}
它應該適合：
class Pojo {
private long timestamp;
// getters, setters, toString
}
解決方案取決于您是否可以更改Pojo模型。如果是并且您想要存儲double并且long可以將類型更改為Number：
private Number timestamp;
你應該能夠解析double' 和long' 的時間戳。如果您總是想要long實現自定義反序列化器：
class LongOrDoubleJsonDeserializer implements JsonDeserializer<Long> {
@Override
public Long deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
if (json.isJsonPrimitive()) {
Number number = json.getAsNumber();
return number.longValue();
}
return null;
}
}
您的Pojo財產應如下所示：
@JsonAdapter(LongOrDoubleJsonDeserializer.class)
private long timestamp;
如果您無法更改Pojo課程，則需要TypeAdapterFactory使用自定義和注冊GsonBuilder。請參閱此鏈接：創建改造實例。自定義實現可能如下所示：
class LongOrDoubleTypeAdapterFactory implements TypeAdapterFactory {
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
Class<? super T> rawType = type.getRawType();
if (rawType == Long.class || rawType == long.class) {
return new TypeAdapter<T>() {
@Override
public void write(JsonWriter out, T value) {
}
@Override
public T read(JsonReader in) throws IOException {
try {
return (T) new Long(in.nextLong());
} catch (NumberFormatException e) {
return (T) new Long(((Double) in.nextDouble()).longValue());
}
}
};
}
return null;
}
}
并注冊如下：
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(new LongOrDoubleTypeAdapterFactory())
.create();
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