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Number.jsp
1 <%@ page contentType="image/jpeg" 2 import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" 3 pageEncoding="utf-8"%> 4 <%!Color getRandColor(int fc, int bc) {//给定范围获得随机颜色 5 Random random = new Random(); 6 if (fc > 255) 7 fc = 255; 8 if (bc > 255) 9 bc = 255; 10 int r = fc + random.nextInt(bc - fc); 11 int g = fc + random.nextInt(bc - fc); 12 int b = fc + random.nextInt(bc - fc); 13 return new Color(r, g, b); 14 } 15 %> 16 <% 17 //设置页面不缓存 18 response.setHeader("Pragma", "No-cache"); 19 response.setHeader("Cache-Control", "no-cache"); 20 response.setDateHeader("Expires", 0); 21 // 在内存中创建图象 22 int width = 60, height = 20; 23 BufferedImage image = new BufferedImage(width, height, 24 BufferedImage.TYPE_INT_RGB); 25 // 获取图形上下文 26 Graphics g = image.getGraphics(); 27 //生成随机类 28 Random random = new Random(); 29 // 设定背景色 30 g.setColor(getRandColor(200, 250)); 31 g.fillRect(0, 0, width, height); 32 //设定字体 33 g.setFont(new Font("Times New Roman", Font.PLAIN, 18)); 34 //画边框 35 //g.setColor(new Color()); 36 //g.drawRect(0,0,width-1,height-1); 37 // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到 38 g.setColor(getRandColor(160, 200)); 39 for (int i = 0; i < 155; i++) { 40 int x = random.nextInt(width); 41 int y = random.nextInt(height); 42 int xl = random.nextInt(12); 43 int yl = random.nextInt(12); 44 g.drawLine(x, y, x + xl, y + yl); 45 } 46 // 取随机产生的认证码(4位数字) 47 String sRand = ""; 48 for (int i = 0; i < 4; i++) { 49 String rand = String.valueOf(random.nextInt(10)); 50 sRand += rand; 51 // 将认证码显示到图象中 52 g.setColor(new Color(20 + random.nextInt(110), 20 + random 53 .nextInt(110), 20 + random.nextInt(110)));//调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成 54 g.drawString(rand, 13 * i + 6, 16); 55 } 56 // 将认证码存入SESSION 57 session.setAttribute("numrand", sRand); 58 // 图象生效 59 g.dispose(); 60 // 输出图象到页面 61 ImageIO.write(image, "JPEG", response.getOutputStream()); 62 out.clear(); 63 out = pageContext.pushBody(); 64 %>
jsp页面login.jsp
<%@ 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>用户登录</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"> --> <link href="css/common.css" rel="stylesheet" type="text/css" /> <link href="css/style.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="js/jquery-1.8.3.js"></script> <script type="text/javascript" src="js/login.js"></script> <script type="text/javascript"> <% String msg = request.getParameter("msg"); if("registerSuccess".equals(msg)){ out.print("alert(‘注册成功，系统将自动跳转登录页‘);"); } if("loginError".equals(msg)){ out.print("alert(‘用户名密码错误，请重新登录‘);"); } if("validateCodeError".equals(msg)){ out.print("alert(‘验证码错误，请重新输入‘);"); } %> </script> </head> <body> <div class="wrap"> <!-- main begin--> <div class="main"> <div class="sidebar"> <p><img src="images/img1.jpg" width="443" height="314" /></p> </div> <div class="sidebarg"> <form action="doLogin" method="post"> <div class="login"> <dl> <dt class="blues">用户登陆</dt> <dd><label for="name">用户名：</label> <input type="text" name="username" class="inputh" value="${username}" id="name"/></dd> <dd><label for="password">密 码：</label> <input type="password" name="userpassword" class="inputh" value="${userpassword}" id="password"/></dd> <dd> <label class="lf" for="passwords">验证码：</label> <input type="text" name="inputCode" class="inputh inputs lf" value="" id="passwords"/> <span class="wordp lf"><img id="validateCode" src="Number.jsp" width="96" height="27" /></span> <span class="blues lf"><a id="changeCode" href="javascript:void(0);" title="">看不清</a></span> </dd> <dd> <input name="" type="checkbox" id="rem_u" /> <span class="rem_u">下次自动登录</span> </dd> <dd class="buttom"> <input name="" type="submit" value="登 录" class="spbg buttombg f14 lf" /> <input id="register" name="" type="button" value="注 册" class="spbg buttombg f14 lf" /> <span class="blues lf"><a href="" title="">忘记密码?</a></span> <div class="cl"></div> </dd> </dl> </div> </form> </div> <div class="cl"></div> </div> <!-- main end--> <!-- footer begin--> </div> <!--footer end--> </body> </html>
javas代码用于刷新验证码
$(function(){ //请自行添加客户端验证 $("#changeCode").click(function(event){ $("#validateCode").attr("src","Number.jsp?ran"+Math.random()); event.preventDefault(); return false; //传到登录界面 }); $("#register").click(function(){ window.location.href = "register.jsp";//传达注册界面的验证码 }); });
servlet代码，用于验证
1 public void doPost(HttpServletRequest request, HttpServletResponse response) 2 throws ServletException, IOException { 3 try { 4 //此处可以添加用户输入验证的代码 5 6 String username = request.getParameter("username"); 7 String userpassword = request.getParameter("userpassword"); 8 9 request.setAttribute("username", username); 10 request.setAttribute("userpassword", userpassword); 11 12 if(!request.getSession().getAttribute("numrand").equals(request.getParameter("inputCode"))){ 13 request.getRequestDispatcher("login.jsp?msg=validateCodeError").forward(request, response); 14 }else{ 15 IUserBiz biz = new UserBizImpl(); 16 Auctionuser user = biz.login(username, userpassword); 17 18 if(user == null){ 19 request.getRequestDispatcher("login.jsp?msg=loginError").forward(request, response); 20 }else{ 21 request.getSession().setAttribute("user", user); 22 response.sendRedirect("auctionList"); 23 } 24 } 25 26 27 28 } catch (Exception e) { 29 // TODO Auto-generated catch block 30 e.printStackTrace(); 31 request.setAttribute("message", e.getMessage()); 32 request.getRequestDispatcher("error.jsp").forward(request,response); 33 } 34 }
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原文地址：http://www.cnblogs.com/jimorulang/p/5554178.html
