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());
            }
        }
        
    }
}