杰克逊将JSON数组反序列化为一类的单个属性

Question

I have a json array:

[
  //...
  {"name": "admin", id: 1},
   //...
]

and two classes named Team, Profile:

class Team {
  Profile profile;
}

class Profile {
  String name;
  long id;
}

so, is it possible to deserialise the json to a list of Team, but the json properties are mapped to the profile property of class Team?

Thank u very much.

Answer 1

Yes, you can do it by writing your custom deserializer like this:

public class TeamDeserializer extends JsonDeserializer<Team> {

@Override
public Team deserialize(JsonParser jp, DeserializationContext ctxt) 
  throws IOException, JsonProcessingException {
    JsonNode node = jp.getCodec().readTree(jp);
    //read the node and set fields
    String name = node.get("name").asText();
    int id = (Integer) ((IntNode) node.get("id")).numberValue();
    //returning in required format
    return new Team(new Profile(name, id));
}
}

You have to register this deserializer before using it like this:

ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addDeserializer(Team.class, new TeamDeserializer());
mapper.registerModule(module);

Team value = mapper.readValue(json, Team.class);

You can modify this for list.

HTH!