dom生成xml文件

public DocumentBuilder (){
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  DocumentBuilder db = null;
  try {
    db = dbf.newDocumentBuilder();
  } catch (ParserConfigurationException e) {
    e.printStackTrace();
  }
  return db;
}

public void createXML(){
  DocumentBuilder db = getDocumentBuilder();
  Document document = db.newDocument();
  
  document.setXmlStandalone(true);
  //创建根节点
  Element bookstore = document.createElement("bookstore");
  //创建子节点
  Element book = document.createElement("book");
  //添加属性
  book.setAttribute("id", "1");
  Element  name = document.createElement("name");
  //添加文本
  name.setTextContent("小王子");
  book.appendChild(name);
  bookstore.appendChild(book);
  //将已经包含book节点的的bookstore节点添加到DOM树中
  document.appendChild(bookstore);
  TransformerFactory tff = TransformerFactory.newInstance();
  try {
    Transformer tf = tff.newTransformer();
    //换行
    tf.setOutputProperty(OutputKeys.INDENT, "yes");
    tf.transform(new DOMSource(document), new StreamResult(new File("books1.xml")));
  } catch (TransformerConfigurationException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  } catch (TransformerException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
}