使用Jackson从嵌套的JSON字符串中赋值变量

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonParser {
    public static void main(String[] args) {
        String jsonString = "{\"name\":\"John\",\"age\":30,\"address\":{\"city\":\"New York\",\"country\":\"USA\"}}";

        try {
            // 创建ObjectMapper对象
            ObjectMapper objectMapper = new ObjectMapper();

            // 解析JSON字符串为Java对象
            Person person = objectMapper.readValue(jsonString, Person.class);

            // 获取嵌套的JSON值
            String name = person.getName();
            int age = person.getAge();
            String city = person.getAddress().getCity();
            String country = person.getAddress().getCountry();

            // 打印结果
            System.out.println("Name: " + name);
            System.out.println("Age: " + age);
            System.out.println("City: " + city);
            System.out.println("Country: " + country);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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

    // 省略构造函数、getter和setter方法

    static class Address {
        private String city;
        private String country;

        // 省略构造函数、getter和setter方法
    }
}