dom4j操作xml

导入dom4j.jar包

 

创建xml文件

        XMLWriter writer = null;// 声明写XML的对象
       
        OutputFormat format = OutputFormat.createPrettyPrint();
        format.setEncoding("utf-8");// 设置XML文件的编码格式

        String filePath = "F://student.xml";//保存xml文件路径
       
        File file = new File(filePath);
       
        Document _document = DocumentHelper.createDocument();
        Element _root = _document.addElement("学生信息");//----------根
        Element student = _root.addElement("学生");
        Element _id = student.addElement("编号");
        _id.setText("001");
        Element _name = student.addElement("姓名");
        _name.setText("灰机");
        Element _age = student.addElement("年龄");
        _age.setText("18");
       
  
        for(int i=0;i<5;i++)
        {
          Element _student = _root.addElement("record");
  
          _student.addAttribute("sid", "00"+i);
          _student.addAttribute("phone", "1100"+i);
        }
    
        try
        {
           
            writer = new XMLWriter(new FileWriter(file), format);
            writer.write(_document);
            writer.close();
           
        } catch (IOException e) {
           
            e.printStackTrace();
        }
       
        System.out.println("操作结束! ");

 

生成结果图：

 

 

 

读取xml文件

 

        SAXReader reader = new SAXReader();

        String filePath = "f://student.xml";
        File file = new File(filePath);
       
        Document document;
        try {
           
             document = reader.read(file);
             Element root = document.getRootElement();// 得到根节点
             
             /*Element database = (Element)root.selectSingleNode("//学生信息/学生");
             List list = database.elements(); //得到database元素下的子元素集合
             for(Object obj:list){
                    Element element = (Element)obj;
                    //getName()是元素名,getText()是元素值
                    System.out.println(element.getName()+": "+element.getText());
                }*/
             List nodes = root.elements("学生");

             for (Iterator it = nodes.iterator(); it.hasNext();) {
                 Element elm = (Element) it.next();
                 for(Iterator it2=elm.elementIterator();it2.hasNext();){
                    
                        Element elel=(Element)it2.next();
                        System.out.println(elel.getName()+":"+elel.getText()+":");
                    }
             
             }



             
             for (Iterator i = root.elementIterator("record"); i.hasNext();) //对所有record子节点进行遍历
             {
                 Element student = (Element) i.next();
                
                 //if (student.attributeValue("sid").equals("001")) //如果record属性sid的值等于001

                 for(Iterator it= student.attributeIterator();it.hasNext();)//获取record节点的所有属性
                 {
                
                     Attribute attribute = (Attribute) it.next();
                     String name=attribute.getName();//获取属性名
                     
                     String text=attribute.getText();//获取属性值
                    
                     System.out.println(name + " :"+text);
                 }
             }
           
        } catch (DocumentException e) {
           
            e.printStackTrace();
        }