Java 使用 dom4j 读取 xml文档 demo

 <?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());
             }
         }

     }
 }