<?xml version="1.0" encoding="UTF-8"?>

 <web-app xmlns="http://www.example.org/web-app_2_5"

             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

             xsi:schemaLocation="http://www.example.org/web-app_2_5 web-app_2_5.xsd"

             version="2.5">

     <servlet>

         <servlet-name>hello</servlet-name>

         <servlet-class>doclwe4</servlet-class>

     </servlet>

     <servlet-mapping>

         <servlet-name>hello</servlet-name>

         <url-pattern>/hello</url-pattern>

     </servlet-mapping>    

 </web-app> 

 package xmldemo;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.InputStream;

 import java.util.List;

 import javax.xml.stream.events.StartDocument;

 import org.dom4j.Document;

 import org.dom4j.DocumentException;

 import org.dom4j.Element;

 import org.dom4j.io.SAXReader;

 public class dom4jDemo {

     public static void main(String[] args) {

         // TODO Auto-generated method stub

         try {

             testSaxReader();

         } catch (Exception e) {

             // TODO: handle exception

             e.printStackTrace();

         }

     }

     public static void testSaxReader() throws DocumentException, FileNotFoundException {

         SAXReader saxReader = new SAXReader();

         FileInputStream file = new FileInputStream("src/xmldemo/schemademo.xml");

         Document doc = saxReader.read(file);

         Element root = doc.getRootElement(); //获取根元素

         System.out.println(root.getName());//获取根元素的名称

         System.out.println(root.attributeValue("version")); //获取根元素上 version 属性

         List<Element> childsElement = root.elements();

         for(Element child : childsElement) {

              if ("servlet".equals(child.getName())) {

                 //拿到 所有标签是servlet 的 标签

                  Element servlet_name = child.element("servlet-name"); //拿到 servlet-name 标签

                  Element servlet_class = child.element("servlet-class"); //拿到 servlet-class 标签

                  System.out.println(servlet_name.getData());

                  System.out.println(servlet_class.getData());

             }

         }

     }

 }