public void BuildXML() throws Exception {

        Element root, student, number, name, age;

        root = new Element("student-info"); // 生成根元素：student-info

        student = new Element("student"); // 生成元素：student(number,name,age)

        number = new Element("number");

        name = new Element("name");

        age = new Element("age");

        Document doc = new Document(root); // 将根元素植入文档doc中

        number.setText("001");

        name.setText("zhang");

        age.setText("24");
        
        student.addContent(name); // 先add的name，那么在XML文件中<name></name>出现在前面

        student.addContent(number);
        
        student.addContent(age);

        root.addContent(student);

        Format format = Format.getCompactFormat();

        format.setEncoding("UTF-8"); // 设置xml文件的字符为gb2312

        format.setIndent(" "); // 设置xml文件的缩进为4个空格

        XMLOutputter XMLOut = new XMLOutputter(format);// 元素后换行一层元素缩四格

        XMLOut.output(doc, new FileOutputStream("c:\\studentinfo.xml"));

    }