MVC验证码

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Home控制器

using bigtree.Actions;using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace MvcVcode.Content{    public class HomeController : Controller    {        //        // GET: /Home/        public ActionResult Index()        {            return View();        }        /// <summary>          /// 调用Itcast.CMS.Common类库中的ValidateCode类 来显示验证码          /// </summary>          /// <param name="str">无用处的参数</param>          /// <returns>图片文件</returns>          public ActionResult ShowValiDataCode(string str)        {            ValidateCode vcode = new ValidateCode();            string code = vcode.CreateValidateCode(5);            Session["vCode"] = code;            return File(vcode.CreateValidateGraphic(code), "image/JPEG");        }    }}

视图

@{    Layout = null;}<!DOCTYPE html><html><head>    <meta name="viewport" content="width=device-width" />    <title>Index</title>    <script src="~/Scripts/jquery-1.8.2.js"></script></head><body>    <div>        <img src="Home/ShowValiDataCode/?id=1" class="validataCode" id="ImageCode" />    </div></body></html><script type="text/javascript">    $(function () {        $(".validataCode").click(function () {            replaceVcode();        })    })    function replaceVcode() {        $("#ImageCode").attr("src", $("#ImageCode").attr("src") + 1);/**/    }    function afterLogin(data) { //        var serverData = data.split(":"); //对请求返还的出数据进行处理；例如这条数据（ok:登陆成功）        if (serverData[0] == "ok") {            $("#serverMes").text(serverData[1]);            window.location.href = "/Login/Login"; //如果登陆成功（ok）就跳转到主页        } else if (serverData[0] == "no") {            $("#serverMes").text(serverData[1]); //提示错误            replaceVcode(); //刷新验证码        }    }</script>

验证码代码ValidateCode.cs

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Drawing;using System.Drawing.Drawing2D;using System.IO;using System.Drawing.Imaging;namespace bigtree.Actions{    public class ValidateCode    {        //// <summary>        /// 生成验证码        /// </summary>        /// <param name="length">指定验证码的长度</param>        /// <returns></returns>        public string CreateValidateCode(int length)        {            int[] randMembers = new int[length];            int[] validateNums = new int[length];            string validateNumberStr = "";            //生成起始序列值            int seekSeek = unchecked((int)DateTime.Now.Ticks);            Random seekRand = new Random(seekSeek);            int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);            int[] seeks = new int[length];            for (int i = 0; i < length; i++)            {                beginSeek += 10000;                seeks[i] = beginSeek;            }            //生成随机数字            for (int i = 0; i < length; i++)            {                Random rand = new Random(seeks[i]);                int pownum = 1 * (int)Math.Pow(10, length);                randMembers[i] = rand.Next(pownum, Int32.MaxValue);            }            //抽取随机数字            for (int i = 0; i < length; i++)            {                string numStr = randMembers[i].ToString();                int numLength = numStr.Length;                Random rand = new Random();                int numPosition = rand.Next(0, numLength - 1);                validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));            }            //生成验证码            for (int i = 0; i < length; i++)            {                validateNumberStr += validateNums[i].ToString();            }            return validateNumberStr;        }        /// <summary>        /// 创建验证码的图片        /// </summary>        /// <param name="containsPage">要输出到的page对象</param>        /// <param name="validateNum">验证码</param>        public byte[] CreateValidateGraphic(string validateCode)        {            Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 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);                //画图片的干扰线                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 Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),                 Color.Blue, Color.DarkRed, 1.2f, true);                g.DrawString(validateCode, font, brush, 3, 2);                //画图片的前景干扰点                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);                //保存图片数据                MemoryStream stream = new MemoryStream();                image.Save(stream, ImageFormat.Jpeg);                //输出图片流                return stream.ToArray();            }            finally            {                g.Dispose();                image.Dispose();            }        }    }}

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