在Jackson中如何在运行时添加变量JSON root

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class Main {
    public static void main(String[] args) {
        // 创建ObjectMapper对象
        ObjectMapper objectMapper = new ObjectMapper();

        // 创建要添加的变量JSON root
        ObjectNode root = objectMapper.createObjectNode();
        root.put("variable", "value");

        // 将变量JSON root添加到要序列化的对象中
        MyObject myObject = new MyObject();
        myObject.setRoot(root);

        try {
            // 序列化对象为JSON字符串
            String json = objectMapper.writeValueAsString(myObject);
            System.out.println(json);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class MyObject {
    private ObjectNode root;

    public ObjectNode getRoot() {
        return root;
    }

    public void setRoot(ObjectNode root) {
        this.root = root;
    }
}