XmlSerializer serializer = Xml.newSerializer();
serializer.startTag(null,element);
serializer.attribute(null,atbname,value);
serializer.text(text);
serializer.endTag(null,tag);

解决方法

public DomXmlExample() {
        try {
            /////////////////////////////
            //Creating an empty XML Document

            //We need a Document
            DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = dbfac.newDocumentBuilder();
            Document doc = docBuilder.newDocument();

            ////////////////////////
            //Creating the XML tree

            //create the root element and add it to the document
            Element root = doc.createElement("root");
            doc.appendChild(root);

            //create a comment and put it in the root element
            Comment comment = doc.createComment("Just a thought");
            root.appendChild(comment);

            //create child element,add an attribute,and add to root
            Element child = doc.createElement("child");
            child.setAttribute("name","value");
            root.appendChild(child);

            //add a text element to the child
            Text text = doc.createTextNode("Filler,... I could have had a foo!");
            child.appendChild(text);

            /////////////////
            //Output the XML

            //set up a transformer
            TransformerFactory transfac = TransformerFactory.newInstance();
            Transformer trans = transfac.newTransformer();
            trans.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION,"yes");
            trans.setOutputProperty(OutputKeys.INDENT,"yes");

            //create string from xml tree
            StringWriter sw = new StringWriter();
            StreamResult result = new StreamResult(sw);
            DOMSource source = new DOMSource(doc);
            trans.transform(source,result);
            String xmlString = sw.toString();

            //print xml
            System.out.println("Here's the xml:\n\n" + xmlString);

        } catch (Exception e) {
            System.out.println(e);
        }
    }