如何将值从json属性上移一级(java)

<dependencies>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.13.0</version>
    </dependency>
</dependencies>

{
  "person": {
    "name": "John",
    "age": 30
  }
}

public class Person {
    private String name;
    private int age;

    // 省略构造方法、getter 和 setter
}

import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
    public static void main(String[] args) throws Exception {
        String json = "{\"person\":{\"name\":\"John\",\"age\":30}}";
        
        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
    }
}

public class PersonData {
    private String name;
    private int age;

    // 省略构造方法、getter 和 setter
}

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
    public static void main(String[] args) throws Exception {
        String json = "{\"person\":{\"name\":\"John\",\"age\":30}}";
        
        ObjectMapper objectMapper = new ObjectMapper();
        JsonNode rootNode = objectMapper.readTree(json);
        JsonNode personNode = rootNode.get("person");
        
        PersonData personData = objectMapper.treeToValue(personNode, PersonData.class);
        
        System.out.println(personData.getName());  // 输出：John
        System.out.println(personData.getAge());   // 输出：30
    }
}