import java.io.File;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.OutputKeys;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerConfigurationException;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Document;import org.w3c.dom.Element;public class CreateXmlDocument {    public static void main(String[] args) {        /*获得（文件创建工厂）实例*/        DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();        try {            /*获取DocumentBuilder对象，单例模式*/            DocumentBuilder db=factory.newDocumentBuilder();            /*The Document interface represents the entire HTML or XML document*/            Document document=db.newDocument();            document.setXmlStandalone(true);            Element bookstore=document.createElement("bookstore");            Element book=document.createElement("book");            Element name=document.createElement("name");            name.setTextContent("华");            book.setAttribute("id", "1");            book.appendChild(name);            document.appendChild(bookstore);            bookstore.appendChild(book);                        /*输出文件到XML中*/            TransformerFactory transformerFactory=TransformerFactory.newInstance();            try {                /*转换器*/                Transformer tf=transformerFactory.newTransformer();                                /**设置输出性质  Provides string constants that can be used to set                  * output properties for a Transformer, or to retrieve output                 *  properties from a Transformer or Templates object.                  *  提供字符串常数被用去设置输出属性从转换器中，或者去恢复输出属性从转换器或模版对象中。                 *                   *  */                tf.setOutputProperty(OutputKeys.INDENT, "yes");                /*输出文件到XML中*/                tf.transform(new DOMSource(document),                        new StreamResult(new File("book2.xml")) );                                            } catch (TransformerConfigurationException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }                                } catch (Exception e) {                        e.printStackTrace();        }    }}