使用Jackson嵌套JSON到Java的映射

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;

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

        ObjectMapper objectMapper = new ObjectMapper();
        Person person = objectMapper.readValue(json, Person.class);

        System.out.println(person.getName()); // 输出：John
        System.out.println(person.getAge()); // 输出：30
        System.out.println(person.getAddress().getCity()); // 输出：New York
        System.out.println(person.getAddress().getCountry()); // 输出：USA
    }

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

        // 使用@JsonProperty注解指定JSON字段与属性的映射关系
        @JsonProperty("name")
        public String getName() {
            return name;
        }

        @JsonProperty("age")
        public int getAge() {
            return age;
        }

        @JsonProperty("address")
        public Address getAddress() {
            return address;
        }
    }

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

        // 使用@JsonProperty注解指定JSON字段与属性的映射关系
        @JsonProperty("city")
        public String getCity() {
            return city;
        }

        @JsonProperty("country")
        public String getCountry() {
            return country;
        }
    }
}