【重點：Xpath講解】Xpath：xml的小型查詢語言，具有強大的功能

users.xml

<?xml version="1.0" encoding="UTF-8"?>
<xml-body>
	<user username="jingtian" password="124343"></user>
	<user username="xiaozhi" password="124343"></user>
</xml-body>

XpathTest.java

import org.dom4j.Document;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;

public class XpathTest
{
	public static void main(String[] args) throws Exception
	{
		String username = "jingtian";
		String password = "124343";
		
		SAXReader reader = new SAXReader();
		Document document = reader.read("users.xml");

		Node node=document.selectSingleNode("//user[@username='" + username+ "' and @password='" + password + "']");
		if(node==null)
			System.out.println("用戶名或者密碼錯誤！");
		else
			System.out.println("登陸成功！");
	}
}