java 读取修改xml / properties

import java.io.*;import org.w3c.dom.*; import javax.xml.parsers.*; import java.io.FileInputStream;import java.io.IOException;import java.util.Properties;public class q {public static void main(String[] args) {xml();pro();}private static void xml(){try {File f=new File("WebRoot/MyXml.xml"); DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance(); DocumentBuilder builder=factory.newDocumentBuilder(); Document doc = builder.parse(f); NodeList nl = doc.getElementsByTagName("user");doc.getElementsByTagName("user.name").item(1).getFirstChild().setNodeValue("Thanks");//修改for (int i=0;i<nl.getLength();i++){ System.out.print("用户名:" + doc.getElementsByTagName("user.name").item(i).getFirstChild().getNodeValue()); System.out.println(" 密码:" + doc.getElementsByTagName("user.pwd").item(i).getFirstChild().getNodeValue()); }} catch (Exception e) {System.out.println("错误"+e.getMessage());}}private static String param1;private static String param2;public static void pro(){Properties prop = new Properties(); //InputStream in = Object.class.getResourceAsStream("/lognin.properties"); try { FileInputStream inputfile=new FileInputStream("WebRoot/lognin.properties");//读取properties文件 prop.load(inputfile); //加载 prop.setProperty("name", "admin");//修改键中的值 param1 = prop.getProperty("name").trim(); //读取键值 param2 = prop.getProperty("pwd").trim(); System.out.println(param1); System.out.println(param2); } catch (IOException e) { e.printStackTrace(); } }}