将嵌套的json映射到具有原始json值的pojo

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

import java.io.IOException;

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

        ObjectMapper objectMapper = new ObjectMapper();
        try {
            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
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

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

        // 使用@JsonProperty注解将JSON字段与POJO属性进行映射
        @JsonProperty("name")
        public String getName() {
            return name;
        }

        @JsonProperty("name")
        public void setName(String name) {
            this.name = name;
        }

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

        @JsonProperty("age")
        public void setAge(int age) {
            this.age = age;
        }

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

        @JsonProperty("address")
        public void setAddress(Address address) {
            this.address = address;
        }
    }

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

        @JsonProperty("city")
        public String getCity() {
            return city;
        }

        @JsonProperty("city")
        public void setCity(String city) {
            this.city = city;
        }

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

        @JsonProperty("country")
        public void setCountry(String country) {
            this.country = country;
        }
    }
}