JAVA操作XML的方式基本上有三种:
   1.SAX: Simple API for XML
         http://www.saxproject.org/
      2. DOM:  Document Object  Model
              http://www.w3.org/DOM
      3. JDOM
                O’Reilly两位作家开发的针对Java的XML解析包
         http://www.jdom.org

   前两种用起来比较麻烦,下面是用JDOM操作XML的主要代码:
    一.采用JDom读取XML文件
               //与SAX配合使用
               SAXBuilder sax = new SAXBuilder();
                //读取XML文件，构建Document对象
              Document doc = sax.build("test.xml");
     
             //获取根元素
             Element root = doc.getRootElement();

              //获取根元素下的子元素
            List list = root.getChildren();
   二.采用JDom写入XML文件

       Document doc = new Document();
         //创建根元素students
       Element root = new Element("students");

        Element s1 = new Element("student");
        Element s2 = new Element("student");
        root.addContent(s1);
        root.addContent(s2);
        //////////////////////////////////////
        Element n1 = new Element("name");
        Element sc1 = new Element("score");
        s1.addContent(n1);
        s1.addContent(sc1);
        n1.setText("张三");
        sc1.setText("80");
        s1.setAttribute("id", "101");
        s1.setAttribute("sex", "男");
        ///////////////////////////////////////
        Element n2 = new Element("name");
        Element sc2 = new Element("score");
        Comment c = new Comment("因为作弊被发现，扣除10分");
        s2.addContent(n2);
        s2.addContent(c);
        s2.addContent(sc2);
        n2.setText("李四");
        sc2.setText("40");
        s2.setAttribute("id", "102");

        doc.addContent(root);
        ////////////////////////////////////
        XMLOutputter xmlOut = new XMLOutputter();
        xmlOut.setFormat(Format.getPrettyFormat());
        try {
            xmlOut.output(doc, new FileOutputStream("test.xml"));
        } catch (IOException ex) {
            ex.printStackTrace();
        }
       ////////////////////////////////////
        刚开始学习XML,有总结不当之处,请指出.