JSP 登录与注册的小案例

Posted 2020-08-24

源代码连接地址如下:链接：http://pan.baidu.com/s/1nvEuHBj 密码：qsr1

#properties文件

driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@192.168.10.105:1521:orcl
user=LF
password=LF

package com.lf.newhw;

public class User {
    
    private String name;//用户名
    private String password;//密码
    private String e_mail;//邮箱
    //无参构造方法
    public User() {
        
    }
    //有参构造方法
    public User(String name,String password,String e_mail) {
        this.name = name;
        this.password = password;
        this.e_mail = e_mail;
    }
    // set和get方法
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getE_mail() {
        return e_mail;
    }
    public void setE_mail(String e_mail) {
        this.e_mail = e_mail;
    }
    @Override
    public String toString() {
        return "User [name=" + name + ", password=" + password + ", e_mail="
                + e_mail + "]";
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((e_mail == null) ? 0 : e_mail.hashCode());
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        result = prime * result
                + ((password == null) ? 0 : password.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        User other = (User) obj;
        if (e_mail == null) {
            if (other.e_mail != null)
                return false;
        } else if (!e_mail.equals(other.e_mail))
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        if (password == null) {
            if (other.password != null)
                return false;
        } else if (!password.equals(other.password))
            return false;
        return true;
    }
    
    
    
    
}

package com.lf.newhw;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Robot;
import java.awt.image.BufferedImage;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.security.auth.message.callback.PrivateKeyCallback.Request;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.sound.midi.Patch;

public class VerifyCode {
    
    //验证码字符的个数
    private static int count = 4;
    //干扰线的条数
    private static int lines = 2;
    /**
     * 随机产生颜色
     * @return 颜色
     */
    private static Color getRandomColor(){
        Random random = new Random();
        Color color = new Color(random.nextInt(255)+1, random.nextInt(255)+1, random.nextInt(255)+1);
        return color;
    }
    /**
     * 获取四个字符的字符串
     * @return 字符串
     */
    public static String getForthWord() {
        String string = "23456789abcdefghijkmnpqrstuvwxyz";
        StringBuilder newStr = new StringBuilder("");
        //随机获取count个数字，根据count个随机数产生字符串
        Random random = new Random();
        for (int i = 0; i < count; i++) {
            int ranNum=random.nextInt(string.length());
            newStr.append(string.charAt(ranNum));
        }
        String str = new String(newStr);
        return str;
    }
    /**
     * 绘画验证码
     * @return BufferedImage
     */
    public static BufferedImage productImage(String verifyCode) {
        
        int width = 70;
        int height = 30;
        // 得到图片缓存区
        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        
        // 得到它的绘制环境（这张图片的笔）
        Graphics2D g2 = (Graphics2D)bi.getGraphics();
        
        // 设置颜色
        g2.setColor(Color.WHITE);
        // 填充整张图片(其实就是设置背景颜色)
        g2.fillRect(0, 0, width, height);
        // 设置字体
        g2.setFont(new Font("宋体", Font.BOLD, 25));
        //设置颜色
        g2.setColor(VerifyCode.getRandomColor());
        // 向图片写字符串
        g2.drawString(verifyCode, 7, 25);
        //画两条干扰线
        Random random = new Random();
        for (int i = 0; i < lines; i++) {
            g2.drawLine(2, random.nextInt(height-10)+10, width-5, random.nextInt(height));
        }
        
        return bi;
    }
}

package com.lf.newhw.jdbc;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;

public class DBUtils {
    
    //文documentName
    private static String defalutName = "dbutils.properties";
    
    //get Connection by default document name
    public static Connection getConnection() {
        Connection connection = getConnection(defalutName);
        return connection;
    }
    
    //get Connection by document name
    private static Connection getConnection(String fileName) {
        // io流读取属性文件
        InputStream in = DBUtils.class.getClassLoader().getResourceAsStream(fileName);
        //读取文件里的内容
        Properties p = new Properties();
        try {
            p.load(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
        //通过键值对获取相应的值
        String url = p.getProperty("url");
        String user = p.getProperty("user");
        String password = p.getProperty("password");
        String driver = p.getProperty("driver");
        System.out.println(driver);
        // 通过映射获取相应的类
        try {
            System.out.println(driver);
            Class.forName(driver);
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        Connection connection = null;
        // 生成Connection
        try {
            connection = DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            //关闭io流
            try {
                if (in!=null) {
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return connection;
    }
    
}

package com.lf.newhw.jdbc;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.lf.newhw.User;

public class UserDao {
    
    
    public static User requeryUser (String sql,Object...args) {
        List<User> list = UserDao.requerUsers(sql, args);
        User user = null;
        for (int i = 0; i < list.size(); i++) {
            user = (User)list.get(0);
//            System.out.println(user);
        }
        return user;
    }
    
    //增删改操作
    public static void  userOperation(String sql,Object...args) {
        //获取连接
        Connection connection = DBUtils.getConnection();
        //创建PreparedStatement对象
        PreparedStatement pStatement = null;
        try {
            pStatement = connection.prepareStatement(sql);
            for (int i = 0; i < args.length; i++) {
                //数据库的列从1开始
                pStatement.setObject(i+1,args[i]);
            }
            //执行sql语句
            pStatement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            // 关闭相应对象
            try {
                if (pStatement!=null)
                pStatement.close();
                if (connection!=null)
                    connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    
    public static List<User> requerUsers(String sql,Object...args) {
        // 创建List
                List<User> list = new ArrayList<User>();
//                String sql = "select * from users";
                //获取connection
                Connection connection = DBUtils.getConnection();
                //创建PreparedStatement对象
                PreparedStatement pStatement = null;
                ResultSet rSet = null;
                
                try {
                    pStatement = connection.prepareStatement(sql);
                    for (int i = 0; i < args.length; i++) {
                        try {
                            pStatement.setObject(i+1, args[i]);
                        } catch (SQLException e) {
                            e.printStackTrace();
                        }
                    }
                    // 结果集
                    rSet = pStatement.executeQuery();
                    while (rSet.next()) {
                        //打印
//                        System.out.println(rSet.getString(1)+" "+rSet.getString(2)+" "+rSet.getString(3));
                        //把数据转成user类的实例对象
                        // 创建User对象
                        User user = new User(rSet.getString(1), rSet.getString(2), rSet.getString(3));
                        //把user对象存入list
                        list.add(user);
                    }
                    
                } catch (SQLException e) {
                    e.printStackTrace();
                }finally{
                    //关闭相应对象
                    try {
                        if (pStatement!=null)
                        pStatement.close();
                        if (connection!=null)
                            connection.close();
                    } catch (SQLException e) {
                        e.printStackTrace();
                    }
                }
                return list;
    }
    
    // 查询
    public static List<User> requeryUsers() {
        // 创建List
        List<User> list = new ArrayList<User>();
        String sql = "select * from users";
        //获取connection
        Connection connection = DBUtils.getConnection();
        //创建PreparedStatement对象
        PreparedStatement pStatement = null;
        ResultSet rSet = null;
        try {
            pStatement = connection.prepareStatement(sql);
            // 结果集
            rSet = pStatement.executeQuery();
            while (rSet.next()) {
                //打印
//                System.out.println(rSet.getString(1)+" "+rSet.getString(2)+" "+rSet.getString(3));
                //把数据转成user类的实例对象
                // 创建User对象
                User user = new User(rSet.getString(1), rSet.getString(2), rSet.getString(3));
                //把user对象存入list
                list.add(user);
            }
            
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            //关闭相应对象
            try {
                if (pStatement!=null)
                pStatement.close();
                if (connection!=null)
                    connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return list;
    }
    
}

package com.lf.newhw.servlet;
import java.io.IOException;
import java.sql.Driver;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.lf.newhw.User;
import com.lf.newhw.jdbc.UserDao;


public class LoginServlet extends HttpServlet{

    
    private static final long serialVersionUID = 1L;

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.out.println("doPost。。。");
        
        // 获取表单中相应的值
        String uerName = req.getParameter("username");
        String password = req.getParameter("password");
//        String email = req.getParameter("e-mail");
        String verifyCode = req.getParameter("verifyCode");
        
        // 将对应的值存起来，便于表单回写
        req.getSession().setAttribute("username", uerName);
        req.getSession().setAttribute("password", password);
//        req.getSession().setAttribute("e-mail", email);
        
        //从数据库里获取数据
        String sql="select * from users where username=? and pwd=?";
        Object[] objects = {uerName,password};
        User user = UserDao.requeryUser(sql, objects);
        //把用户信息保存起来
        req.getSession().setAttribute("user", user);
//        System.out.println("user:"+user);
        
        //获取验证码
        String code = (String)req.getSession().getAttribute("verifyCode");
//        System.out.println("code:"+code+" verifyCode:"+verifyCode);

        String msg = null;
        msg = user==null?"用户名或密码错误":(code.equalsIgnoreCase(verifyCode)?"":"验证码错误");
        System.out.println("msg:"+msg);
        if (msg=="") {
            // 转发
            req.getRequestDispatcher("/index.jsp").forward(req, resp);
        }else {
            // 重定向
            resp.sendRedirect(req.getContextPath()+"/login.jsp");
            //把msg存入session
            req.getSession().setAttribute("msg", msg);
        }


    }
}

package com.lf.newhw.servlet;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import oracle.net.aso.p;

import com.lf.newhw.User;
import com.lf.newhw.jdbc.UserDao;

public class RegisterServlet extends HttpServlet{
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        
        // 进行注册操作
        // 获取表单中相应的值
        String rName = req.getParameter("rname");
        String password = req.getParameter("rpassword");
        String pwd = req.getParameter("rpwd");
        String email = req.getParameter("remail");
        System.out.println(rName+" "+password+" "+pwd+" "+email);
        // 将对应的值存起来，便于表单回写
        req.getSession().setAttribute("rname", rName);
        req.getSession().setAttribute("rpassword", password);
        req.getSession().setAttribute("rpwd", pwd);
        req.getSession().setAttribute("remail", email);
        
        //从数据库里获取数据(如果没有相关用户名则可存入数据库)
        String sql="select * from users where username=?";
        Object[] objects = {rName};
        User user = UserDao.requeryUser(sql, objects);
        
        //
        String tipMsg = null;
        
        System.out.println("rName:"+rName);
        //如果为空提示
        if (rName=="" || password=="" || pwd=="" || email=="") {
            tipMsg = "选项不能为空";
            System.out.println("=============:");
        }
        System.out.println("===tipMsg:"+tipMsg);
        // 如果不为空字段往下执行
        if (tipMsg==null) {
            
            System.out.println("+_+user:"+user);
            tipMsg = user!=null?"该用户已存在":"";
            System.out.println("----tipMsg:"+tipMsg);
            // 如果用户名不存在，就判断密码
            if (tipMsg=="") {
                // 判断密码
                if (password!=null) {
                    tipMsg= password.equals(pwd)?"":"密码不匹配";
                }
                System.out.println("+_+++tipMsg:"+tipMsg);
                // 如果密码匹配正确，判断邮箱
                if (tipMsg=="") {
                    // 使用正则表达式判断邮箱
                    String check = "^[a-z\\d]+(\\.[a-z\\d]+)*@([\\da-z](-[\\da-z])?)+(\\.{1,2}[a-z]+)+$";
                    Pattern regex = Pattern.compile(check);
                    Matcher matcher = regex.matcher(email);
                    boolean isMatched = matcher.matches();
                    tipMsg = isMatched?"":"输入的邮箱有误！";
                    System.out.println("正则表达式isMatched："+isMatched+",tipMsg"+tipMsg);
                }
                
            }

            if (tipMsg=="") {
                //无误，进行存储
                String sqlString = "insert into users values(?,?,?)";
                Object[] objects2={rName,password,email};
                UserDao.userOperation(sqlString, objects2);
                tipMsg="已录入";
            }
        }
        System.out.println("end+tipMsg:"+tipMsg);
        // 存储提示信息
        req.getSession().setAttribute("tipMsg", tipMsg);
        resp.sendRedirect(req.getContextPath()+"/register.jsp");
    }
}

package com.lf.newhw.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.lf.newhw.jdbc.UserDao;

public class UpdateServlet extends HttpServlet{
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.out.println("============doPost");
        // 获取表单的值
        String name = req.getParameter("updatename");
        String password = req.getParameter("updatepwd");
        String eMail = req.getParameter("updateEmail");
        // 获取用户名（初始值）
        String username = (String)req.getSession().getAttribute("oldName");
        System.out.println(name+" "+password+" "+eMail+" "+username);
    
        //更新数据库的信息
        String sql = "update users set username=?,pwd=?,email=? where username=?  ";
        Object[] objects = {name,password,eMail,username};
        UserDao.userOperation(sql, objects);
        //提示信息
        req.getSession().setAttribute("message", "已成功修改！");
        //重定向
        resp.sendRedirect(req.getContextPath()+"/updateInfo.jsp");
    }
    
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page language="java" import="com.lf.newhw.VerifyCode" %>
<%@ page language="java" import="javax.imageio.ImageIO" %>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP ‘image.jsp‘ starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
  
    <%  
        //得到验证码并存入session
        String verifyCode = VerifyCode.getForthWord();
        session.setAttribute("verifyCode", verifyCode);
        ImageIO.write(VerifyCode.productImage(verifyCode), "JPEG", response.getOutputStream());
        /* System.out.println("ImageServlet...."+verifyCode); */
        out.clear();  
        out = pageContext.pushBody();  
        
     %>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP ‘index.jsp‘ starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
      <h1>欢迎您，<%=session.getAttribute("username")%></h1>
      <a href="updateInfo.jsp">修改个人信息</a><br>
      <a href="info.jsp">查询所有用户</a>
  </body>
</html>

<%@page import="com.lf.newhw.User"%>
<%@page import="com.lf.newhw.jdbc.UserDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP ‘info.jsp‘ starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
    <%
        List list = UserDao.requeryUsers();
        //可继续完善（可以通过<table>显示，页面效果会好些）
        /* for(int i = 0;i < list.size();i++){
            out.print(list.get(i)+"<br>");
        } */
    %>
    <table border="1">
     <%
        //行
         for(int i = 0;i < list.size();i++){
             User user = (User)list.get(i);
     %>
          <tr>
     <% 
             //每行3个单元格
             for(int j = 0;j < 3;j++){
     %>
             
             <td><%= j==0?user.getName():((j==1)?user.getPassword():user.getE_mail())%>
     <% 
             }
      %>
          <br>
      <% 
         }
      %>
      </table>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  
    <base href="<%=basePath%>">
    
    <title>my test</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    <script>
        function changeVerifyCode(){
            var time = new Date().getTime();
            document.getElementById("img").src="image.jsp?"+time;
        }
    </script>
  </head>
  
  
  
  <body>
      <div>
          <form action="LoginServlet" method="post">
         <% String msg = (String)request.getSession().getAttribute("msg");
             msg = msg==null?"":msg;
             
         %>
             <h3><%=msg %></h3>
                <!-- 在此要进行回写（EL表达式） -->
               用户名：<input type="text" name="username" value="${sessionScope.username}"/><br/>
               密  码：<input type="text" name="password" value="${sessionScope.password}"/><br>
           <!--     邮 箱：<input type="text" name="e-mail" /><br> -->
               验证码：<input style="width:100px;" name="verifyCode"><img src="image.jsp" id="img"><u id="u" onclick="changeVerifyCode()">换一张</u>
               <br>
               <input  type="submit" value="登录"/>
               
       </form>
       <button onclick="window.location.href=‘register.jsp‘">注册</button>
      </div>
      
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP ‘register.jsp‘ starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
    <div>
          <h2>${sessionScope.tipMsg}</h2>
       <!--表单-->
       <form action="RegisterServlet" method="post">
           <!--帐号-->
           <div class="row">
                           用户名: <input type="text" placeholder="  请输入帐号" name="rname" value="${sessionScope.rname}"/>
           </div>

           <!--密码-->
           <div class="row">
                                                      密码:<input type="password" placeholder="  请输入密码" name="rpassword" value="${sessionScope.rpassword}"/>
           </div>

           <!--确认密码-->
           <div >
                                                      确认密码:<input type="password" placeholder="  请确认密码" name="rpwd" value="${sessionScope.rpwd}"/>
           </div>

           <!--邮箱-->
           <div>
                 邮箱:<input placeholder="  请输入邮箱" name="remail" value="${sessionScope.remail}"/>
           </div>
           <!--提交按钮-->
           <div>
               <input type="submit" value="提交"/>
           </div>
           <a href="login.jsp">返回登录页面</a>
       </form>
    </div>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@page import="com.lf.newhw.User"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP ‘updateInfo.jsp‘ starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    
  </head>
  
  <body>
      <form action="UpdateServlet" method="post">
        <% User user = (User)session.getAttribute("user"); 
            String oldName = user.getName();
            session.setAttribute("oldName", oldName);
            String message = (String)session.getAttribute("message");
            
            message = message==null?"":message;
        %>
        
          <h1>修改个人信息</h1>
           <h2><%= message%></h2>
            用户名：<input type="text" name="updatename" value="<%=user.getName()%>"/><br/>
             密  码：<input type="text" name="updatepwd" value="<%=user.getPassword()%>"/><br>
             邮 箱：<input type="text" name="updateEmail" value="<%=user.getE_mail()%>"/><br>
           <input  type="submit" value="提交"/><br>
           <a href="index.jsp">返回上一页</a>
    <br>
      </form>
    
  </body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <!--  注册LoginServlet  -->
  <servlet>
      <servlet-name>LoginServlet</servlet-name>
      <servlet-class>com.lf.newhw.servlet.LoginServlet</servlet-class>
  </servlet>
  <!-- 配置LoginServlet映射 -->
  <servlet-mapping>
      <servlet-name>LoginServlet</servlet-name>
      <url-pattern>/LoginServlet</url-pattern>
  </servlet-mapping>
  
  
  
  <!--  注册UpdateServlet  -->
  <servlet>
      <servlet-name>UpdateServlet</servlet-name>
      <servlet-class>com.lf.newhw.servlet.UpdateServlet</servlet-class>
  </servlet>
  <!-- 配置UpdateServlet映射 -->
  <servlet-mapping>
      <servlet-name>UpdateServlet</servlet-name>
      <url-pattern>/UpdateServlet</url-pattern>
  </servlet-mapping>
  
  <!--  注册UpdateServlet  -->
  <servlet>
      <servlet-name>RegisterServlet</servlet-name>
      <servlet-class>com.lf.newhw.servlet.RegisterServlet</servlet-class>
  </servlet>
  <!-- 配置UpdateServlet映射 -->
  <servlet-mapping>
      <servlet-name>RegisterServlet</servlet-name>
      <url-pattern>/RegisterServlet</url-pattern>
  </servlet-mapping>

</web-app>