dom4j写xml

String username = request.getParameter("username");
    String age = request.getParameter("age");
    Date d = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateStr = sdf.format(d); 
    System.out.println("username-->"+username);
    System.out.println("age-->"+age);
    String path = request.getRealPath("/")+"xml\\";
    XMLWriter writer = new XMLWriter(new FileWriter(path+"jqOne.xml"));
    Document doc = DocumentHelper.createDocument();
    Element root = doc.addElement("root");
    Element message = root.addElement("message").addAttribute("username",username)
    .addAttribute("age",age).addAttribute("createtime",dateStr);
    writer.write(doc);
    writer.close();