如何使用排序键将java.util.Properties写入XML？

import java.io.StringWriter;
import java.util.Properties;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

public String propertiesToXML(Properties properties) {
    try {
        javax.xml.parsers.DocumentBuilderFactory dbf = javax.xml.parsers.DocumentBuilderFactory.newInstance();
        javax.xml.parsers.DocumentBuilder db = dbf.newDocumentBuilder();
        org.w3c.dom.Document doc = db.newDocument();
        org.w3c.dom.Element root = doc.createElement("properties");
        doc.appendChild(root);

        for (String key : properties.stringPropertyNames()) {
            org.w3c.dom.Element element = doc.createElement("property");
            element.setAttribute("key", key);
            element.setTextContent(properties.getProperty(key));
            root.appendChild(element);
        }

        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");

        StringWriter stringWriter = new StringWriter();
        transformer.transform(new DOMSource(doc), new StreamResult(stringWriter));
        return stringWriter.getBuffer().toString();
    } catch (Exception e) {
        throw new RuntimeException("Error converting properties to XML", e);
    }
}

Properties properties = new Properties();
properties.setProperty("key1", "value1");
properties.setProperty("key2", "value2");

String xmlString = propertiesToXML(properties);
System.out.println(xmlString);

<?xml version="1.0" encoding="UTF-8"?><properties>
  <property key="key1">value1</property>
  <property key="key2">value2</property>
</properties>