如何以编程方式创建新用户jazn-data.xml？

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

public class CreateUserXML {
    public static void main(String[] args) {
        try {
            // 创建XML文档对象
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
            Document doc = docBuilder.newDocument();

            // 创建根节点
            Element rootElement = doc.createElement("users");
            doc.appendChild(rootElement);

            // 创建新用户节点
            Element userElement = doc.createElement("user");
            rootElement.appendChild(userElement);

            // 设置用户属性
            userElement.setAttribute("username", "jazn");
            userElement.setAttribute("password", "password123");
            userElement.setAttribute("role", "admin");

            // 将XML文档保存为文件
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult("jazn-data.xml");
            transformer.transform(source, result);

            System.out.println("jazn-data.xml文件创建成功！");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}