Java HTML/XML - 如何使用dom4j在另一个xml文档中插入一个xml节点作为第一个子节点

import java.io.StringReader;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.dom.DOMDocument;
import org.dom4j.dom.DOMDocumentFactory;
import org.dom4j.io.SAXReader;

public class Main {
  public static void main(String[] args) throws DocumentException {
    String newNode = "<node>value</node>";
    String text = "<root><given></given></root>";
    DOMDocumentFactory factory = new DOMDocumentFactory();
    SAXReader reader2 = new SAXReader();
    reader2.setDocumentFactory(factory);
    org.dom4j.Document document = reader2.read(new StringReader(text));
    Document newNodeDocument = reader2.read(new StringReader(newNode));

    Element givenNode = document.getRootElement().element("given");
    givenNode.add(newNodeDocument.getRootElement());

    org.dom4j.dom.DOMDocument w3cDoc = (DOMDocument) document;
    org.w3c.dom.Element e = w3cDoc.createElement("div");
    e.setAttribute("id", "someattr");

    w3cDoc.getDocumentElement().getFirstChild().insertBefore(e, w3cDoc.getDocumentElement().getElementsByTagName("node").item(0));
    System.out.println(document.asXML());
  }
}