将嵌套的json和jackson映射到java字段

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\":{\"street\":\"123 Main St\",\"city\":\"New York\"}}";

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

        System.out.println(person.getName()); // Output: John
        System.out.println(person.getAddress().getCity()); // Output: New York
    }

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

        // Getters and setters

        @JsonProperty("name")
        public String getName() {
            return name;
        }

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

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

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

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

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

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

        // Getters and setters

        @JsonProperty("street")
        public String getStreet() {
            return street;
        }

        public void setStreet(String street) {
            this.street = street;
        }

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

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