反序列化为使用Gson扩展LinkedHashMap的类

Question

我正在尝试从JSON反序列化为使用Gson扩展LinkedHashMap的类。 我可以直接在LinkedHashMap中轻松完成此操作，但是当我尝试使用LinkedHashMap的子类时，出现错误

java.lang.IllegalStateException：应为BEGIN_OBJECT，但在第1行第3列路径$处为STRING。

我需要使用的类型（我不拥有此类型，因此无法选择使用其他任何类型）：

public class ValueMap extends LinkedHashMap<CharSequence, Object> {}

我必须定义一个InstanceCreator来解决CharSequence的问题。 作为基本示例，我尝试反序列化的JSON是：

{"people":[{"name":"name1","surname":"name2","age":12,"dogs":["spot","fluffy","batman"],"cars":[{"name":"name1","model":1933},{"name":"name2","model":343}]},{"name":"name2","surname":"name2","age":44,"dogs":["spot","test","jack"]}]}

更新以包括序列化/反序列化代码：

GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.registerTypeAdapter(CharSequence.class, new CharSequenceInstanceCreator());

Gson gson = gsonBuilder.create();

String serialized = gson.toJson(value);

LinkedHashMap<CharSequence, Object> deserialized = gson.fromJson(serialized, ValueMap.class);

CharSequenceInstanceCreator如下所示：

public static class CharSequenceInstanceCreator implements InstanceCreator<CharSequence> {

    @Override
    public CharSequence createInstance(Type arg0) {
        return new String();
    }

}

Answer 1

定义JsonDeserializer而不是InstanceCreator。

public static class CharSequenceDeserializer implements JsonDeserializer<CharSequence> {

    @Override
    public CharSequence deserialize(JsonElement element, Type type,
            JsonDeserializationContext context) throws JsonParseException {
        return element.getAsString();
    }

}

并注册。

//  gsonBuilder.registerTypeAdapter(CharSequence.class, new CharSequenceInstanceCreator());
gsonBuilder.registerTypeAdapter(CharSequence.class, new CharSequenceDeserializer());