Dom4j初步使用

一、解析XML文件

//读取用户名和密码

       public   static  List getUserInfo(String  filePath ,String  usertype )  throws  DocumentException{

           List  user  =  new  ArrayList();

           String  username  =  null ;

           String  password  =  null ;

           SAXReader  reader  =  new  SAXReader();

        Document  document  =  reader .read(  filePath );

        Element  root  =  document .getRootElement();

//        System.out.println(root.getName()); //打印根节点名称

//        //获取某节点的属性

//        String freeuser = root.element("user").attributeValue("type");

//        System.out.println( freeuser);

       

        List  childElements  =  root  .elements(  "user"  );

         for (Element  element :  childElements ){

             if (  element .attributeValue(  "type" ).equals(  usertype )){

                  username  =  element .element(  "username" ).getText();

                  password  =  element .element(  "password" ).getText();

                  user .add(0,  username );

                  user .add(1,  password );

                  //System.out.println(username );

           }  else   if  ( element .attributeValue(  "type" ).equals(  usertype )){

                  username  =  element .element(  "username" ).getText();

                  password  =  element .element(  "password" ).getText();

                  user .add(0,  username );

                  user .add(1,  password );

           }

        }

         return    user ;

     }

二、Dom4j生成XMl文件

  public class Dom4jBuildXml {      public void build(){         try {             //DocumentHelper提供了创建Document对象的方法                Document document = DocumentHelper.createDocument();             //添加节点信息               Element rootElement = document.addElement("users");             //这里可以继续添加子节点，也可以指定内容            rootElement.setText("这个是module标签的文本信息");             Element element = rootElement.addElement("user");                          Element nameElement = element.addElement("name");              Element valueElement = element.addElement("password");            Element descriptionElement = element.addElement("description");             nameElement.setText("名称");              nameElement.addAttribute("language", "java");//为节点添加属性值             valueElement.setText("值");              valueElement.addAttribute("language", "c#");             descriptionElement.setText("描述");              descriptionElement.addAttribute("language", "sql server");               System.out.println(document.asXML()); //将document文档对象直接转换成字符串输出             Writer fileWriter = new FileWriter("c:\\user.xml");              //dom4j提供了专门写入文件的对象XMLWriter              XMLWriter xmlWriter = new XMLWriter(fileWriter);              xmlWriter.write(document);             xmlWriter.flush();              xmlWriter.close();              System.out.println("xml文档添加成功！");            } catch (IOException e) {              e.printStackTrace();         }     }