Question

我尝试使用customDeserilizer解析JSON以嵌套Object

这是我的解串器：

    class MapDeserializer implements JsonDeserializer<Map<String, String>> {

    public Map<String, String> deserialize(JsonElement json, Type typeOfT,
                                           JsonDeserializationContext  context){
        try {
        Map<String, String> result = new HashMap<String, String>();
        JsonObject object = json.getAsJsonObject(); 
            for (Map.Entry<String, JsonElement> entry : object.entrySet()) {
                String key = entry.getKey();
                String value = entry.getValue().getAsString();
                result.put(key, value);
            }
    //    }
            return result;
        }catch (Exception e){
            e.printStackTrace();
            return null;
        }
    }
}

我正在使用以下代码行注册此解串器

      Gson gson = new           GsonBuilder().registerTypeHierarchyAdapter(TaggedActorMap.class, new MapDeserializer()).create();
                    sActivityBean = gson.fromJson(result,
                            SimilarActivityBean.class);

这是我的POJO班级

public class TaggedActorMap implements Serializable {
private String key;
private  String value;
  }

我收到错误

    java.lang.IllegalArgumentException: invalid value for field
  at java.lang.reflect.Field.setField(Native Method)
  at java.lang.reflect.Field.set(Field.java:588)
  at     com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1
  .read(ReflectiveTypeAdapterFactory.java:119)
  at   com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter
  .read(ReflectiveTypeAdapterFactory.java:217)
  at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.
  read(TypeAdapterRuntimeTypeWrapper.java:40)
  at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.
  read(CollectionTypeAdapterFactory.java:81)
  at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.
  read(CollectionTypeAdapterFactory.java:60)
  at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.
  read(ReflectiveTypeAdapterFactory.java:117)
  at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.
  read(ReflectiveTypeAdapterFactory.java:217)
  at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.
  read(ReflectiveTypeAdapterFactory.java:117)
  at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter
 .read(ReflectiveTypeAdapterFactory.java:217)
  at com.google.gson.Gson.fromJson(Gson.java:814)
  at com.google.gson.Gson.fromJson(Gson.java:779)
  at com.google.gson.Gson.fromJson(Gson.java:728)
  at com.google.gson.Gson.fromJson(Gson.java:700)

Answer 1

这有点乱。你需要确保一切都捆绑在一起。

您并未在任何地方提及MapSerializer（您的JsonDeserializer实施）。在构建ArrayOfObjectsToMapDeserializer时，您指的是名为GsonBuilder的内容。此外，在构建构建器时，请参考TaggedActorMap.class，但您正在尝试反序列化名为SimilarActivityBean的类。

您尚未为SimilarActivityBean注册任何自定义反序列化程序，因此我猜测gson尝试使用某些默认反序列化程序反序列化JSON，但由于实际JSON中的数据与{中的字段不匹配，因此失败{1}}

无法使用自定义JsonDeserializer GSON解析Dynamic KeyValue对JSON

1 个答案: