xpath提取xml文档数据

package cn.itcast.sax;

import java.io.File;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Node;

import org.dom4j.io.SAXReader;

public class Demo5 {

/**

* 查找user.xml文档是否有和用户相匹配的用户名和密码

* @throws Exception

*/

public static void main(String[] args) throws Exception {

String username = "aaa";

String password = "123";

//检测xml文档是否有匹配的用户名和密码

SAXReader reader = new SAXReader();

Document document = reader.read(new File("src/user.xml"));

Node node = document.selectSingleNode("//user[@username='"+username+"' and @password='"+password+"']");

if(node==null){

System.out.println("用户名或密码错误");

}else{

System.out.println("登陆成功!!!");

}

}

}