用gson反序列化Java中的嵌套任意类

Question

i need to convert the json-string tmp => {"result_count":1,"next_offset":1,"entry_list":[{"id":"xyz123","module_name":"Products","name_value_list":{"id":{"name":"id","value":"xyz123"},"name":{"name":"name","value":"test_product_2"}}}],"relationship_list":[]} into a corresponding java-pojo

my pojo looks like

public class GetEntryListResponse {

public int result_count = 0;
public int next_offset = 0;
public List<EntryList> entryList = new ArrayList<EntryList>();
public static class EntryList {
    String id = "";
    String module_name = "";
    public static class NameValueList {
        public static class Id {
            String name = "";
            String value = "";
        }
        public static class Name {
            String name = "";
            String value = "";
        }
    }
}
}

and for the deserilizing-task a use

Gson json_response = new Gson();
GetEntryListResponse resp = json_response.fromJson(tmp, 
                                                   GetEntryListResponse.class);

i also tried other variants but this one seems to be the best so far. the problem is that result_count and next_offset are transformed into int but the type of the array entryList is with null-values.

Answer 1

Implement InstanceCreator and JsonDeserializer for your class

  public class GetEntryListResponse implements
            InstanceCreator<GetEntryListResponse>,
            JsonDeserializer<GetEntryListResponse>{

    @Override
        public GetEntryListResponse createInstance(Type type) {
            return this;
        }

    @Override
        public GetEntryListResponse deserialize(JsonElement json, Type typeOfT){
      json.getJsonObject();// 
    // create your classes objects here by json key
    }

and use

GsonBuilder builder = new GsonBuilder();
        Gson gson = builder.registerTypeAdapter(GetEntryListResponse.class,
                new GetEntryListResponse()).create();

Answer 2

try changing:

public List<EntryList> entryList = new ArrayList<EntryList>();

to:

public List<EntryList> entry_list= new ArrayList<EntryList>();

and deserialize.