xml 操作

   publicstatic void main(String[] args) ...{
        DocumentBuilderFactoryfactory=DocumentBuilderFactory.newInstance();
        Element theBook=null, theElem=null,root=null;
        try ...{
           factory.setIgnoringElementContentWhitespace(true);
           
           DocumentBuilder db=factory.newDocumentBuilder();
            Documentxmldoc=db.parse(new File("Test1.xml"));
           root=xmldoc.getDocumentElement();
           
            //---  新建一本书开始 ----
           theBook=xmldoc.createElement("book");
           theElem=xmldoc.createElement("name");
           theElem.setTextContent("新书");
           theBook.appendChild(theElem);
           
           theElem=xmldoc.createElement("price");
           theElem.setTextContent("20");
           theBook.appendChild(theElem);

           theElem=xmldoc.createElement("memo");
           theElem.setTextContent("新书的更好看。");
           theBook.appendChild(theElem);
           root.appendChild(theBook);
           System.out.println("---  新建一本书开始 ----");
           output(xmldoc);
            //---  新建一本书完成 ----