日常小结-XPath用于解析XML文档

来源：互联网发布：用流程图描述算法编辑：程序博客网时间：2024/06/04 18:35

使用XPath的时候，除了dom4j以外，还需要额外添加一个.jar包-jaxen包。

package sax;import java.io.File;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.io.SAXReader;public class Demo2 {    //用XPath提取数据    public static void main(String[] args) throws DocumentException {        SAXReader reader = new SAXReader();        Document document = reader.read(new File("src/book.xml"));        String value = document.selectSingleNode("//作者").getText();        System.out.println(value);    }}

密码验证实例：

package sax;import java.io.File;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Node;import org.dom4j.io.SAXReader;public class Demo3 {    public static void main(String[] args) throws DocumentException {        String username = "aaa";        String passwrod = "123";        SAXReader reader = new SAXReader();        Document document = reader.read(new File("src/users.xml"));        Node node = document.selectSingleNode("//user[@username='"+username+"' and @password='"+passwrod+"']");        if(node==null){            System.out.println("用户名密码错误");        }else{            System.out.println("登录成功");        }    }}

<?xml version="1.0" encoding="UTF-8"?><users>    <user id="1" username="aaa" password="123" email="aa@sina.com"/>    <user id="2" username="bbb" password="123" email="aa@sina.com"/></users>

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