Java 在使用DOM4J创建副本时，在xsd:schema中保留或添加默认命名空间

将DOM树从一个文档复制到另一个文档时，我希望将

xmlns=”“

中的

xsd:schema

节点从原始文档保留到新文档

但是，当我使用

DOM4J

createCopy（）

时，它排除了这一点

原始文件包含

<xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">

hy， 对于复制联合国文档xml，您可以使用.clone（），以下是一个示例：

public static void copyDocument() {

    //read document
    Document documentOld = getDocument("C:\\test\\test.xml");

    if (documentOld != null) {
        Element elRoot = documentOld.getRootElement();

        Element elRootCopy = (Element) elRoot.clone();

        Document documentNew = DocumentHelper.createDocument();

        documentNew.add(elRootCopy);

        //save the new document
    }
    else {
        System.out.println("document not found or document is not well format ");
    }

}

public static Document getDocument(String pathname) {

    Document document = null;

    SAXReader saxReader = null;

    try {

        saxReader = new SAXReader();

        document = saxReader.read(new File(pathname));
    }
    catch (DocumentException e) {

        e.printStackTrace();
    }

    return document;
}

        SAXReader reader = new SAXReader();
        Document document0 = reader.read(new File(filePath).toURI().toURL());
        document1.add(document0.getRootElement().createCopy());
        // Create output format
        OutputFormat format = OutputFormat.createPrettyPrint();
        format.setEncoding("utf-8");
        format.setIndent(true);
        // lets write to a file
        XMLWriter writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream(filePath), "UTF8"), format);
        writer.write(document);
        writer.close();

public static void copyDocument() {

    //read document
    Document documentOld = getDocument("C:\\test\\test.xml");

    if (documentOld != null) {
        Element elRoot = documentOld.getRootElement();

        Element elRootCopy = (Element) elRoot.clone();

        Document documentNew = DocumentHelper.createDocument();

        documentNew.add(elRootCopy);

        //save the new document
    }
    else {
        System.out.println("document not found or document is not well format ");
    }

}

public static Document getDocument(String pathname) {

    Document document = null;

    SAXReader saxReader = null;

    try {

        saxReader = new SAXReader();

        document = saxReader.read(new File(pathname));
    }
    catch (DocumentException e) {

        e.printStackTrace();
    }

    return document;
}