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我正在 servlets Tomcat 8.0 的容器中执行一个 Web 应用程序。在请求中，我尝试使用下面的代码将输入数据转换为 XML。第一个输入数据字符是一个unicode补充字符U+16980，表示为字符对\ud81a\udd80，第二个字符是另一个补充字符U+16990，表示为字符对\ud81a\udd90。

    String text = "    �  �";
    DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
    Document document = documentBuilder.newDocument();

    Element root = document.createElement("root");
    document.appendChild(root);
    Element node = document.createElement("sofa");

    node.appendChild(document.createTextNode(text));

    root.appendChild(node);

    Source xmlSource = new DOMSource(document);

    // create StreamResult for transformation result
    javax.xml.transform.Result result = new StreamResult(new FileOutputStream("text.xml"));

    // create TransformerFactory
    TransformerFactory transformerFactory = TransformerFactory.newInstance();

    // create Transformer for transformation
    Transformer transformer = transformerFactory.newTransformer();

    // transform and deliver content to client
    transformer.transform(xmlSource, result);

我期待：<root><sofa>&#92544; &#92560; � �&lt;/sofa></root>

但相反，我得到：<root><sofa>&#55322;&#56704; &#55322;&#56720; � �&lt;/sofa> </root>

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