Gson如何解析自定义字段

public class User {
    private String name;
    private int age;

    // getters and setters
}

import com.google.gson.*;

import java.lang.reflect.Type;

public class UserDeserializer implements JsonDeserializer<User> {
    @Override
    public User deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        JsonObject jsonObject = json.getAsJsonObject();
        User user = new User();
        user.setName(jsonObject.get("name").getAsString());
        user.setAge(jsonObject.get("age").getAsInt());

        // 处理自定义字段
        if (jsonObject.has("customField")) {
            String customFieldValue = jsonObject.get("customField").getAsString();
            // 可以在这里对 customFieldValue 进行处理
            System.out.println("Custom Field Value: " + customFieldValue);
        }

        return user;
    }
}

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class Main {
    public static void main(String[] args) {
        String json = "{\"name\":\"John\", \"age\":30, \"customField\":\"someValue\"}";

        GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.registerTypeAdapter(User.class, new UserDeserializer());
        Gson gson = gsonBuilder.create();

        User user = gson.fromJson(json, User.class);
        System.out.println("User Name: " + user.getName());
        System.out.println("User Age: " + user.getAge());
    }
}