替换Apache CXF版本3.1.16中缺少的org.apache.cxf.helpers.DOMUtils.writeXml(节点n，OutputStream os)

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.OutputStream;

public class CustomDOMUtils {

    public static void writeXml(Node node, OutputStream os) throws ParserConfigurationException, TransformerException, IOException {
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

        Document doc = docBuilder.newDocument();
        doc.appendChild(doc.importNode(node, true));

        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");

        DOMSource source = new DOMSource(doc);
        StreamResult result = new StreamResult(os);

        transformer.transform(source, result);
    }

    public static void main(String[] args) throws ParserConfigurationException, IOException, TransformerException {
        // 示例用法
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
        Document doc = docBuilder.newDocument();

        Element rootElement = doc.createElement("root");
        doc.appendChild(rootElement);

        Element childElement = doc.createElement("child");
        Text textNode = doc.createTextNode("Hello, World!");
        childElement.appendChild(textNode);
        rootElement.appendChild(childElement);

        OutputStream outputStream = System.out; // 替换为需要的输出流
        writeXml(rootElement, outputStream);
    }
}