XPath 小案例
1 <?xml version="1.0" encoding="UTF-8"?> 2 <users> 3 <user id="1" username="aaa" password="123" email="123@163.com"/> 4 <user id="2" username="bbb" password="456" email="678@163.com"/> 5 </users>
1 package dom4j; 2 3 import java.io.File; 4 5 import org.dom4j.Document; 6 import org.dom4j.Node; 7 import org.dom4j.io.SAXReader; 8 9 public class demo1 { 10 11 public static void main(String[] args) throws Exception 12 { 13 String username="aaa"; 14 String password="124"; 15 16 //检测xml文档中是否有匹配的用户名和密码 17 SAXReader reader = new SAXReader(); 18 Document document = reader.read(new File("src/dom4j/system.xml")); 19 Node node=document.selectSingleNode("//user[@username='"+username+"' and @password='"+password+"']"); 20 21 if(node==null) 22 { 23 System.out.println("用户名或密码错误！！"); 24 } 25 else 26 { 27 System.out.println("登录成功！！"); 28 } 29 } 30 31 }
XPath要注意使用帮助手册，特别简单，手册地址：http://www.zvon.org/xxl/XPathTutorial/General/examples.html
