系统登录详解
登录整体思路是:生成的验证码存入session中,然后与提交表单中中输入的验证码作比较。
登陆成功:存入浏览器的cookie中。
注销:清楚浏览器中存入的登录名。
1.验证码页面html
@using (Html.BeginForm("Login", "Account", FormMethod.Post)) { <div class="login_position"> <p class="center_text p1 top30_M">xx平台管理</p> <div class="hr1"></div> <div class="left50_M"> <div class="login_input top15_M"> <img src="~/Content/images/login_person.png" /><input type="text" name="username" autocomplete="off" id="username" placeholder="请输入用户名" /> </div> <div class="login_input top30_M"> <img src="~/Content/images/login_lock.png" /><input type="password" name="password" placeholder="请输入密码"/> </div> <div class="top30_M"> <input placeholder="验证码" name="code" autocomplete="off" id="code" class="login_input2" style="width:100px;" /> <img class="left15_M" onclick="this.src = this.src + '?' + Math.random();" src="@Url.Action("code","Account")" title="看不清楚,换一张" width="83" height="29" align="absmiddle" style="cursor: pointer;" id="imgcodeaa" /> </div> <input type="submit" value="登 录" class="login_btn top30_M" /> </div> </div> }
2.控制器
验证码生成代码
//验证码入口 [AllowAnonymous] public ActionResult Code() { return File(AccountController.CreateCheckIamge(), @"iamge/Jpeg"); } //验证码生成并且存入服务器session private static string GenerateCheckCode() { try { int number; char code; string checkCode = String.Empty; System.Random random = new Random(); for (int i = 0; i < 4; i++) { number = random.Next(); if (number % 2 == 0) code = (char)('0' + (char)(number % 10)); else code = (char)('A' + (char)(number % 26)); checkCode += code.ToString(); } //Session["CheckCode"] = checkCode; System.Web.HttpContext.Current.Session.Add("CheckCode", checkCode.ToLower()); //Response.Cookies.Add(new HttpCookie("CheckCode", checkCode)); return checkCode; } catch (Exception ex) { return ""; } } //添加水印 private static byte[] CreateCheckCodeImage(string checkCode) { if (checkCode == null || checkCode.Trim() == String.Empty) return null; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22); Graphics g = Graphics.FromImage(image); try { //生成随机生成器 Random random = new Random(); //清空图片背景色 g.Clear(Color.White); //画图片的背景噪音线 for (int i = 0; i < 25; i++) { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 = random.Next(image.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); } Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic)); System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(checkCode, font, brush, 2, 2); //画图片的前景噪音点 for (int i = 0; i < 100; i++) { int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.FromArgb(random.Next())); } //画图片的边框线 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); //Response.ClearContent(); //Response.ContentType = "image/Gif"; //Response.BinaryWrite(ms.ToArray()); return ms.ToArray(); } finally { g.Dispose(); image.Dispose(); } } public static byte[] CreateCheckIamge() { return CreateCheckCodeImage(GenerateCheckCode()); }
登录代码:
[HttpPost] [AllowAnonymous] public ActionResult Login(FormCollection fc) { return base.Visit(() => { string username = fc["username"]; string password = fc["password"]; if (!string.IsNullOrEmpty(username)) { //获取表单数据 if (Session["CheckCode"] == null) { throw new Exception("获取验证码时失败,请确认您是否关闭浏览器 cookie 功能"); } string code = Request["code"].ToLower().Trim(); string checkcode = Session["CheckCode"].ToString().ToLower().Trim(); if (code != checkcode) { return Content("<script>alert('验证码输入错误!请重新输入验证码!');window.location.href='/Account/Login'</script>"); } var model = BLL.Sys.AccountBLL.Instance.GetModel(username, password); if (model == null) { return Content("<script>alert('用户名或密码错误!');window.location.href='/Account/Login'</script>"); } else { //提供对票证的属性和值的访问,这些票证用于 Forms 身份验证对用户进行标识,绑定用户名 FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(username, false, (int)FormsAuthentication.Timeout.TotalMinutes); //加密HTTP Cookie 中的 Forms 身份验证票证 string enticket = FormsAuthentication.Encrypt(ticket); // 创建和命名新的 Cookie,并为其赋值。 HttpCookie cookieofau = new HttpCookie(FormsAuthentication.FormsCookieName, enticket); //HTTP Cookie 添加到 HTTP 响应 Cookie 集合 Response.AppendCookie(cookieofau); return RedirectToAction("index", "Home"); } } return View(); }); }
用户注销代码:
public ActionResult LogOut() { return base.Visit(() => { //查看是否为已经验证的客户 if (User.Identity.IsAuthenticated) { //获取客户端发送的 Cookie 的集合, Forms 身份验证票证的 Cookie 名称。默认值是“.ASPXAUTH”。 HttpCookie authcookie = Request.Cookies[FormsAuthentication.FormsCookieName]; //获取 FormsAuthenticationTicket对象 (传值为加密的 票据表示) FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(authcookie.Value); //从浏览器删除 Forms 身份验证票证。 FormsAuthentication.SignOut(); } return Redirect("/Account/Login"); }); }
效果图:
一个完整的验证码实例:
<!DOCTYPE html> <html lang="en" xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8" /> <title></title> <script src="jquery-3.3.1.js"></script> <style> body{ background: #999; } #divID { position: fixed; left: 47%; top: 53%; width: 500px; margin-left: -200px; margin-top: -150px; font-family: "黑体"; /*禁止复制粘贴*/ -moz-user-select: none; -webkit-user-select: none; user-select:none; color:#fff; } .register_dialog_info { float: left; margin-left:10px; color: #fff; margin-top: 5px; font-size: 20px; } form{padding: 20px 0px;} ul li {list-style: none;} .sub { text-align: center; } .sub input { display: inline-block; width: 300px; background-color: #999; color: rgb(255, 255, 255); font-size: 20px; text-align: center; height: 40px; line-height: 40px; font-family: 黑体; outline: none; border: none; margin: auto; border-radius: 10px; } input[type = "submit"]:hover{cursor: pointer;} .reg-box { padding-left: 30px; } .reg-box li { line-height: 44px; width: 500px; overflow: hidden; } .reg-box li label { width: 68px; height: 50px; float: left; line-height: 50px; text-align: right; padding-right: 20px; } .reg-box li input,.reg-box li select{ border-radius: 3px; padding: 6px 0; font-size: 16px; width: 296px; height: 49px; line-height: 28px; border: 1px solid #dddddd; text-indent: 0.5em; float: left; } .reg-box li select option{font-size:16px;} /*验证码*/ .add { width: 128px; height: 44px; float: left; _display: inline; cursor: pointer; margin-left: 20px; } .reg-box li .sradd { width: 148px; text-indent: 4px; font-size: 14px; } .reg-box li .input-code { width: 106px; padding: 10px; font-family: Arial; font-style: italic; color: red; letter-spacing: 1px; cursor: pointer; text-align: center; text-indent: 0; } .yzm,.phoKey { background: #012246; text-align: center; line-height: 44px; color: #fff; border-radius: 3px;} .phoKey{letter-spacing: 3px; font-size:18px;} .yzmc { background: #dddddd; text-align: center; line-height: 44px; color: #999; } .error { clear:both;display:block;color: red; padding-left: 90px; padding-bottom:5px;height:20px;float: left; font-size:12px;line-height: 20px;} input { background-color: #fff; outline: none; } .reg-box li { width: auto; } .reg-box li input.errorC, .errorC{ border: 1px solid blue; } .reg-box li input.checkedN , .checkedN{ border: 1px solid #1ece6d; } </style> <script> //文本框默认提示文字 function textFocus(el) { if (el.defaultValue == el.value) { el.value = ''; el.style.color = '#333'; } } function textBlur(el) { if (el.value == '') { el.value = el.defaultValue; el.style.color = '#999'; } } $(function () { /*生成验证码*/ create_code(); //登录页面的提示文字 //账户输入框失去焦点 (function login_validate() { $(".reg-box .account").blur(function () { //reg=/^1[3|4|5|8][0-9]\d{4,8}$/i;//验证手机正则(输入前7位至11位) if ($(this).val() == "" || $(this).val() == "请输入您的账号") { $(this).addClass("errorC"); $(this).next().html("账号不能为空!"); $(this).next().css("display", "block"); $(".sub input").prop('disabled', true); } // else if($(".reg-box .account").val().length<11) // { // $(this).addClass("errorC"); // $(this).next().html("账号长度有误!"); // $(this).next().css("display","block"); // } // else if(!reg.test($(".reg-box .account").val())) // { // $(this).addClass("errorC"); // $(this).next().html("账号不存在!"); // $(this).next().css("display","block"); // } else { $(".sub input").prop('disabled', false); $(this).addClass("checkedN"); $(this).removeClass("errorC"); $(this).next().empty(); } }); /*密码输入框失去焦点*/ $(".reg-box .admin_pwd").blur(function () { //reg=/^[\@A-Za-z0-9\!\#\$\%\^\&\*\.\~]{6,22}$/; if ($(this).val() == "") { $(this).addClass("errorC"); $(this).next().html("密码不能为空!"); $(this).next().css("display", "block"); $(".sub input").prop('disabled', true); } // else if(!reg.test($(".admin_pwd").val())) { // $(this).addClass("errorC"); // $(this).next().html("密码为6~12位的数字、字母或特殊字符!"); // $(this).next().css("display","block"); // } else { $(".sub input").prop('disabled', false); $(this).addClass("checkedN"); $(this).removeClass("errorC"); $(this).next().empty(); } }); /*验证码输入框失去焦点*/ $(".reg-box .photokey").blur(function () { var code1 = $('.reg-box input.photokey').val().toLowerCase(); var code2 = $(".reg-box .phoKey").text().toLowerCase(); if (code1 != code2) { $(this).addClass("errorC"); $(this).next().next().html("验证码输入错误!!!"); $(this).next().next().css("display", "block"); $(".sub input").prop('disabled', true); } else { $(".sub input").prop('disabled', false); $(this).removeClass("errorC"); $(this).next().next().empty(); $(this).addClass("checkedN"); } }) })(); }); function create_code() { function shuffle() { var arr = ['1', 'r', 'Q', '4', 'S', '6', 'w', 'u', 'D', 'I', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', '2', 's', 't', '8', 'v', '7', 'x', 'y', 'z', 'A', 'B', 'C', '9', 'E', 'F', 'G', 'H', '0', 'J', 'K', 'L', 'M', 'N', 'O', 'P', '3', 'R', '5', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']; return arr.sort(function () { return (Math.random() - .5); }); }; shuffle(); function show_code() { var ar1 = ''; var code = shuffle(); for (var i = 0; i < 6; i++) { ar1 += code[i]; } ; //var ar=ar1.join(''); $(".reg-box .phoKey").text(ar1); }; show_code(); $(".reg-box .phoKey").click(function () { show_code(); }); } </script> </head> <body> <div id="divID"> <div style="background-color:transparent;"> <form id="ff" method="post"> <ul class="reg-box"> <li> <label for="">账 号</label> <input type="text" name="accName" value="" class="account" maxlength="11" style="color:#999;" onblur="textBlur(this)" onfocus="textFocus(this)" /> <span class="error error5"></span> </li> <li> <label for="">密 码</label> <input type="password" name="accPassWord" class="admin_pwd" value="" style="color:#999;" onblur="textBlur(this)" onfocus="textFocus(this)" /> <span class="error error6"></span> </li> <li> <label for="">验证码</label> <input type="text" class="sradd photokey" id="key" value="" style="color:#999;ime-mode:disabled;-webkit-ime-mode:inactive;" onblur="textBlur(this)" onfocus=" textFocus(this) " /> <span class="add phoKey"></span> <span class="error error7"></span> </li> </ul> <div class="sub"> <input type="submit" value="立即登录" /> </div> </form> </div> </div> </body> </html>
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我曾拾到过一束光,日落时还给了夕阳。