我正在開發(fā)一個(gè)Android應(yīng)用程序。我正在使用改造Gson來調(diào)用服務(wù)器并序列化/反序列化。在請(qǐng)求中，有一個(gè)包含timestamp( long) 的響應(yīng)類。有時(shí)這是double因?yàn)閕OS應(yīng)用程序的版本double用于存儲(chǔ)時(shí)間戳。有沒有辦法強(qiáng)制Gson反序列化響應(yīng)并轉(zhuǎn)換為Response類（長(zhǎng)）上存在的對(duì)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(xiàn)1804條經(jīng)驗(yàn) 獲得超2個(gè)贊
為簡(jiǎn)單起見，假設(shè)您的JSON有效負(fù)載是：
{
"timestamp": 1555323142345.345
}
它應(yīng)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(chǔ)double并且long可以將類型更改為Number：
private Number timestamp;
你應(yīng)該能夠解析double' 和long' 的時(shí)間戳。如果您總是想要long實(shí)現(xiàn)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(cái)產(chǎn)應(yīng)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(cè)GsonBuilder。請(qǐng)參閱此鏈接：創(chuàng)建改造實(shí)例。自定義實(shí)現(xiàn)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(cè)如下：
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(new LongOrDoubleTypeAdapterFactory())
.create();
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