javaweb简单的登录注册功能实现

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我是靠谱客的博主忧心草莓，最近开发中收集的这篇文章主要介绍javaweb简单的登录注册功能实现，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

原文：http://blog.csdn.net/qq_24473141/article/details/51363662

下面是用户登录注册流程图

登陆界面

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 <%@ 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"> 
     -->  
     <script type="text/javascript">  
       function change(){  
           var img =document.getElementById("verify");  
           img.src="VerifyCodeServlet?a="+new Date().getTime();  
       }  
     </script>  
   </head>  
     
   <body>  
   <center>  
 <div>  
 <h1>欢迎登陆</h1>  
 <form action="LoginServlet" method="post">  
     <table>  
     <tr>  
     <td width="66" align="right"><font size="3">帐号：</font></td><td colspan="2"><input type="text" name="username" value="${username }" style="width:200;height:25;"/></td>  
     </tr>  
     <tr>  
     <td align="right"><font size="3">密码：</font></td><td colspan="2"><input type="text" name="password"  style="width:200;height:25;"/></td>  
     </tr>  
     <tr>  
     <td align="right"><font size="3">验证码：</font></td>  
     <td width="108" valign="middle"><input type="text" name="verifycode" style="width:100;height:25;"/></td>  
     <td width="90" valign="middle"><a href="javascript:change()"><img src="VerifyCodeServlet" id="verify" border="0"></a></td>  
     </tr>  
     <tr><td colspan="3" align="center"><input type="submit" value="登录" style="width:130;height:30;"/></td></tr>  
     </table>  
     </form>  
     <a href="regist.jsp"><font size="2"><i>没有帐号？点击注册</i></font></a>  
 <font color="red" size="2"> ${msg }</font>  
 </div>  
 </center>  
   </body>  
 </html>  

注册界面

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 <%@ 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 'regist.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>  
   <center>  
     <div>  
     <h1>注册</h1>  
     <form action="RegistServlet" method="post">  
     请输入帐号：<input type="text" name="username"><br/>  
     请输入密码：<input type="password" name="password"><br/>  
     请确认密码：<input type="password" name="rpsw"><br/>  
     <input type="submit" value="注册">  
     </form>  
    <font color="red" size="2"> ${msg }</font>  
     </div>  
     </center>  
   </body>  
 </html>  

欢迎界面

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 <%@ 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 'welcome.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>这是主页</h1>  
     <h2>${msg }</h2>  
   </body>  
 </html>  

LoginServlet

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 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.wzc.loginDao.UserDao;  
   
 public class LoginServlet extends HttpServlet {  
   
     private static final long serialVersionUID = 1L;  
   
     public void doPost(HttpServletRequest request, HttpServletResponse response)  
             throws ServletException, IOException {  
         request.setCharacterEncoding("utf-8");  
         response.setContentType("text/html;charset=utf-8");  
         String username = request.getParameter("username");  
         String password = request.getParameter("password");  
         String verifyc  = request.getParameter("verifycode");<span style="font-family: Arial, Helvetica, sans-serif;">//得到表单输入的内容</span>  
         String svc =(String) request.getSession().getAttribute("sessionverify");  
         String psw =new UserDao().findUsername(username);  
         if(!svc.equalsIgnoreCase(verifyc)){  
             request.setAttribute("msg", "验证码错误！");  
             request.getRequestDispatcher("/index.jsp").forward(request, response);  
             return;  
         }  
         if(psw ==null){  
             request.setAttribute("msg", "没有这个用户！");  
             request.getRequestDispatcher("/index.jsp").forward(request, response);  
             return;  
         }  
         if(psw!=null&&!psw.equals(password)){  
             request.setAttribute("msg", "密码错误请重新输入！");  
             request.getRequestDispatcher("/index.jsp").forward(request, response);  
             return;  
         }  
         if(psw.equals(password)){  
             request.setAttribute("msg", "用户："+username+",欢迎访问");  
             request.getRequestDispatcher("/welcome.jsp").forward(request, response);  
             //response.setHeader("Refresh","1;url=welcome.jsp");  
         }  
           
     }  
   
 }  

RegistServlet

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 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.wzc.loginDao.UserDao;  
   
 public class RegistServlet extends HttpServlet {  
   
     private static final long serialVersionUID = 1L;  
   
     public void doPost(HttpServletRequest request, HttpServletResponse response)  
             throws ServletException, IOException {  
   
         request.setCharacterEncoding("utf-8");  
         response.setContentType("text/html;charset=utf-8");  
         String username = request.getParameter("username");  
         String password = request.getParameter("password");  
         String rpsw = request.getParameter("rpsw");//得到表单输入的内容  
         if(username==null||username.trim().isEmpty()){  
             request.setAttribute("msg", "帐号不能为空");  
             request.getRequestDispatcher("/regist.jsp").forward(request, response);  
             return;  
         }  
         if(password==null||password.trim().isEmpty()){  
             request.setAttribute("msg", "密码不能为空");  
             request.getRequestDispatcher("/regist.jsp").forward(request, response);  
             return;  
         }  
         if(!password.equals(rpsw)){  
             request.setAttribute("msg", "两次输入的密码不同");  
             request.getRequestDispatcher("/regist.jsp").forward(request, response);  
             return;  
         }  
         UserDao u = new UserDao();  
         u.addUser(username,password);//调用addUser（）方法  
         request.setAttribute("msg", "恭喜："+username+"，注册成功");  
         request.getRequestDispatcher("/index.jsp").forward(request, response);  
   
     }  
   
 }  

VerifyCodeServlet

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 import java.awt.image.BufferedImage;  
 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.wzc.utils.VerifyCode;  
   
   
 public class VerifyCodeServlet extends HttpServlet {  
   
     private static final long serialVersionUID = 1L;  
   
     public void doGet(HttpServletRequest request, HttpServletResponse response)  
             throws ServletException, IOException {  
         VerifyCode vc = new VerifyCode();  
         BufferedImage image = vc.getImage(85,23);//设置验证码图片大小  
         request.getSession().setAttribute("sessionverify", vc.getText());//将验证码文本保存到session域  
         VerifyCode.output(image, response.getOutputStream());  
   
     }  
   
 }  

VerifyCode

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 public class VerifyCode {  
   
   
     public static final char[] CHARS = { '2', '3', '4', '5', '6', '7', '8',  
             '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M',  
             'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };  
   
     public static Random random = new Random();  
   
     public String getRandomString() {  
         StringBuffer buffer = new StringBuffer();  
         for (int i = 0; i < 4; i++) {  
             buffer.append(CHARS[random.nextInt(CHARS.length)]);  
         }  
         return buffer.toString();  
     }  
   
     public  Color getRandomColor() {  
         return new Color(random.nextInt(255), random.nextInt(255), random  
                 .nextInt(255));  
     }  
   
     public  Color getReverseColor(Color c) {  
         return new Color(255 - c.getRed(), 255 - c.getGreen(), 255 - c  
                 .getBlue());  
     }  
     String text = getRandomString();  
     public String getText() {  
         return text;  
     }  
   
     public BufferedImage getImage(int width,int height ){  
         Color color = getRandomColor();  
         Color reverse = getReverseColor(color);  
   
         BufferedImage bi = new BufferedImage(width, height,  
                 BufferedImage.TYPE_INT_RGB);  
         Graphics2D g = bi.createGraphics();  
         g.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 20));  
         g.setColor(color);  
         g.fillRect(0, 0, width, height);  
         g.setColor(reverse);  
         g.drawString(text, 10, 22);  
         for (int i = 0, n = random.nextInt(80); i < n; i++) {  
             g.drawRect(random.nextInt(width), random.nextInt(height), 1, 1);  
         }  
         return bi;  
           
     }  
     public static void output(BufferedImage image, OutputStream out) throws IOException{  
         ImageIO.write(image, "JPEG", out);  
     }  
   
 }  

UserDao

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 import java.sql.Connection;  
 import java.sql.DriverManager;  
 import java.sql.PreparedStatement;  
 import java.sql.ResultSet;  
 import java.sql.SQLException;  
   
 public class UserDao {  
     public String findUsername(String username){  
         String psw = null;  
         Connection con =null;  
         PreparedStatement pstmt =null;  
         ResultSet rs = null;  
         try {  
             String driver ="com.mysql.jdbc.Driver";  
             String url ="jdbc:mysql://localhost:3306/zhuce";  
             String user ="root";  
             String password ="root";<span style="font-family: Arial, Helvetica, sans-serif;">//改为自己的用户名密码和数据库名</span>  
             Class.forName(driver);  
             con = DriverManager.getConnection(url, user, password);  
             String sql = "select * from zc where name=?";  
             pstmt = con.prepareStatement(sql);  
             pstmt.setString(1, username);  
             rs = pstmt.executeQuery();  
             if(rs==null){  
                 return null;  
             }  
             if(rs.next()){  
                 psw=rs.getString("password");  
             }else{  
                 psw=null;  
             }  
         } catch (ClassNotFoundException e) {  
             e.printStackTrace();  
         } catch (SQLException e) {  
             e.printStackTrace();  
         }finally {  
             try {  
                 if(pstmt!=null)pstmt.close();  
                 if(con!=null)con.close();  
                 }   
             catch (SQLException e) {          
                                     }  
         }  
         return psw;  
     }  
     public void addUser(String username,String psw){  
         Connection con =null;  
         PreparedStatement pstmt =null;  
         try {  
             String driver ="com.mysql.jdbc.Driver";  
             String url ="jdbc:mysql://localhost:3306/zhuce";  
             String user ="root";  
             String password ="root";//改为自己的用户名密码和数据库名  
             Class.forName(driver);  
             con = DriverManager.getConnection(url, user, password);  
             String sql = "INSERT INTO ZC VALUES(?,?)";  
             pstmt = con.prepareStatement(sql);  
             pstmt.setString(1, username);  
             pstmt.setString(2, psw);  
             pstmt.executeUpdate();  
         } catch (ClassNotFoundException e) {  
             e.printStackTrace();  
         } catch (SQLException e) {  
             e.printStackTrace();  
         }finally {  
             try {  
                 if(pstmt!=null)pstmt.close();  
                 if(con!=null)con.close();  
                 }   
             catch (SQLException e) {          
                                     }  
         }  
     }  
     //单独测试使用  
     //public static void main(String[] args) {  
         //String psw =new UserDao().findUsername("345");  
         //System.out.println(psw);  
         //UserDao u = new UserDao();  
         //u.addUser("345", "345");  
     //}  
       
 }  