我如何在java中通过这个json？

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonExample {
    public static void main(String[] args) {
        // JSON字符串
        String jsonStr = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";

        try {
            // 解析JSON
            ObjectMapper objectMapper = new ObjectMapper();
            Person person = objectMapper.readValue(jsonStr, Person.class);
            System.out.println("Name: " + person.getName());
            System.out.println("Age: " + person.getAge());
            System.out.println("City: " + person.getCity());

            // 创建JSON
            Person newPerson = new Person("Alice", 25, "London");
            String newJsonStr = objectMapper.writeValueAsString(newPerson);
            System.out.println("New JSON: " + newJsonStr);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 定义一个Person类
    static class Person {
        private String name;
        private int age;
        private String city;

        // 构造函数、getter和setter方法

        public Person() {
        }

        public Person(String name, int age, String city) {
            this.name = name;
            this.age = age;
            this.city = city;
        }

        // getter和setter方法...

        public String getName() {
            return name;
        }

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

        public int getAge() {
            return age;
        }

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

        public String getCity() {
            return city;
        }

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