如何创建多级xml文件

Question

I have a trouble in finding info about creating a multi level tags in xml file for example i want next structure

<UserCards>
  <UserCard userCardId="171">
   <userName>somename</userName>
   <userSurname>somesurname</userSurname>
   <userAge>24</userAge>
   <userAdress>someadress</userAdress>
   <userPhone>223334455</userPhone>
     <CurrentBooks>
       <booName>someBookName</bookName>
     </CurrentBooks>
  </UserCard>
</UserCards>

I can create simple one level xml but how can I add new one?

 DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
                DocumentBuilder docBulder = docFactory.newDocumentBuilder();

                //root mainElement
                Document doc = docBulder.newDocument();
                Element rootElement = doc.createElement("UserCards");
                doc.appendChild(rootElement);

                //root Book
                Element UserCard = doc.createElement("UserCard");
                rootElement.appendChild(UserCard);
                ...  
                ...
                //write in a XMLFile
                TransformerFactory transformerFactory = TransformerFactory.newInstance();
                Transformer transformer = transformerFactory.newTransformer();
                DOMSource source = new DOMSource(doc);
                StreamResult result = new StreamResult(new File("Test/UserCards.xml"));

Answer 1

seems to me like you answered it yourself.... You can append elements to any element, not just the root. You create all Elements by calling doc.createElement("name") and append to the parent element of your choice:

Elmenet userName = doc.createElement("userName");
Text userNameText = doc.createTextNode("somename");
userName.appendChild(userNameText);
UserCard.appendChild(userName);

Answer 2

Try this

            Element rootElement = doc.createElement("UserCards");
            doc.appendChild(rootElement);

            //root Book
            Element UserCard = doc.createElement("UserCard");
            UserCard.setAttribute("userCardId" , "171");
            Element userSurname = doc.createElement("userSurname");
            UserCard.appendChild(userSurname);

            Element userAge = doc.createElement("userAge");
            UserCard.appendChild(userAge);
            Element userAdress = doc.createElement("userAdress");
            UserCard.appendChild(userAdress);
            Element userPhone = doc.createElement("userPhone");
            UserCard.appendChild(userPhone);
            Element CurrentBooks = doc.createElement("CurrentBooks");
            Element booKName = doc.createElement("booKName");
            CurrentBooks.appendChild(booKName);
            UserCard.appendChild(CurrentBooks);
            rootElement.appendChild(UserCard);