MVC+EasyUI+三层新闻网站建立 验证码生成（三）

using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Web;namespace NewWeb.Common{  public class ValidateCode  {      public ValidateCode()      {      }      /// <summary>      /// 验证码的最大长度      /// </summary>      public int MaxLength      {        get { return 10; }      }      /// <summary>      /// 验证码的最小长度      /// </summary>      public int MinLength      {        get { return 1; }      }      /// <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="context">要输出到的page对象</param>      /// <param name="validateNum">验证码</param>      public void CreateValidateGraphic(string validateCode, HttpContext context)      {        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          context.Response.Clear();          context.Response.ContentType = "image/jpeg";          context.Response.BinaryWrite(stream.ToArray());        }        finally        {          g.Dispose();          image.Dispose();        }      }      /// <summary>      /// 得到验证码图片的长度      /// </summary>      /// <param name="validateNumLength">验证码的长度</param>      /// <returns></returns>      public static int GetImageWidth(int validateNumLength)      {        return (int)(validateNumLength * 12.0);      }      /// <summary>      /// 得到验证码的高度      /// </summary>      /// <returns></returns>      public static double GetImageHeight()      {        return 22.5;      }      //C# MVC 升级版      /// <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();        }      }    }  }

 public ActionResult ValidateCode()    {      Common.ValidateCode validateCode = new Common.ValidateCode();      string code = validateCode.CreateValidateCode(4); //生成的验证码4个长度      Session["validateCode"] = code;      byte[] buffer = validateCode.CreateValidateGraphic(code);//创建验证码图片      return File(buffer, "image/jpeg");//返回图片    }

 <tr>   <td style="width:20px"></td>    <td><img id="image" src="/Login/ValidateCode/?id=1" style="float: left; height: 24px;" /></td>    <td><a href="javascript:void(0)" onclick="changeCheckCode();return false;">看不清，换一张</a></td></tr>

 <script type="text/javascript">    $(function () {            initWin(); //初始化登录窗体      changeCheckCode(); //切换验证码    });    function initWin() {      $("#win").window({        title: "登录",        width: 400,        height: 270,        collapsible: false,        minimizable: false,        maximizable: false,        closable: false,        modal: true,        resizable: false,      });          }    //切换验证码    function changeCheckCode() {      $("#changeVcode").click(function () {        $("#image").attr("src", $("#image").attr("src") + 1);      });    }  </script>