Copying a Subtree of Nodes in a DOM Document : DOM Tree « XML « Java Tutorial

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2. XML
3. DOM Tree

import java.io.File;

import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class Main {
  public static void main(String[] argv) throws Exception {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setValidating(true);

    factory.setExpandEntityReferences(false);

    Document doc = factory.newDocumentBuilder().parse(new File("filename"));
    NodeList list = doc.getElementsByTagName("entry");
    Element element = (Element) list.item(0);

    Element dup = (Element) element.cloneNode(true);

    element.getParentNode().insertBefore(dup, element.getNextSibling());
  }
}