使用GSON从嵌套的json中获取数据

import com.google.gson.Gson;

public class NestedJsonExample {
    public static void main(String[] args) {
        // 假设有如下嵌套的JSON数据
        String json = "{ \"name\": \"John\", \"age\": 30, \"address\": { \"city\": \"New York\", \"country\": \"USA\" } }";

        // 创建Java对象模型
        class Address {
            String city;
            String country;
        }

        class Person {
            String name;
            int age;
            Address address;
        }

        // 解析JSON数据
        Gson gson = new Gson();
        Person person = gson.fromJson(json, Person.class);

        // 获取嵌套数据
        String cityName = person.address.city;
        String countryName = person.address.country;

        // 打印结果
        System.out.println("City: " + cityName);
        System.out.println("Country: " + countryName);
    }
}