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public boolean createXML(){
  try{
   Document doc = DocumentHelper.createDocument();
   Element root = doc.addElement("root");
   Element personNode = root.addElement("person");
   Element sonNode = personNode.addElement("fristson");
   sonNode.setText("lk1");
   Element sonNode2 = personNode.addElement("secandtson");
   sonNode2.setText("lk2");
   
   OutputFormat opf = OutputFormat.createPrettyPrint();
   opf.setEncoding("GB2312");
   
   XMLWriter xmlw = new XMLWriter(new FileWriter("d:\\myXML.xml"),opf);
   xmlw.write(doc);
   
   xmlw.close();
   return true;
  }catch(Exception e){
   System.out.println("error: In create XML");
   return false;
  }
 }
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public boolean updateXML(){
  Document doc = null;
  try{
   SAXReader sr = new SAXReader();
   doc = sr.read(new File("d:\\web.xml"));
   Element personRoot = doc.getRootElement();
   Iterator personNode = personRoot.elementIterator();
   while(personNode.hasNext()){
    Element sonNode = (Element)personNode.next();
    List sonNodes = sonNode.elements();
    System.out.println(sonNode.getName());
     for(int i = 0 ;i<sonNodes.size() ; i++){
      System.out.println(i+":"+((Element)sonNodes.get(i)).getName());
      System.out.println(i+":"+((Element)sonNodes.get(i)).getText());
     }