MVC验证码的编写

主要是相互学习一下mvc，希望各位大神指导

 1 /// <summary>

 2         /// 生成随机数字

 3         /// </summary>

 4         /// <returns>随机数字</returns>

 5         public string GetCode(int len = 4)

 6         {

 7             string strCode = string.Empty;

 8             char code;

 9             int num;

10             Random rnd = new Random();

11             for (int i = 0; i < len; i++)

12             {

13                 num = rnd.Next();

14                 if (num % 2 == 0)

15                 {

16                     code = (char)('0' + (char)(num % 10));

17                 }

18                 else

19                 {

20                     //code = (char)('0' + (char)(num % 10));

21                    code = (char)('A' + (char)(num % 26));

22                 }

23                 strCode += code.ToString();

24             }

25             return strCode;

26         }

生成随机数 

 1         /// <summary>

 2         /// 生成验证码（保存验证码到图片）

 3         /// </summary>

 4         /// <returns>二进制</returns>

 5         public byte[] ProcessRequestImage(string validateCode)

 6         {

 7 

 8             HttpContext context = HttpContext.Current;

 9             using (Bitmap bmp = new Bitmap(validateCode.Length * 15 + 10, 28))

10             {

11                 Graphics g = Graphics.FromImage(bmp);

12                 g.Clear(Color.White);

13                 Random rnd = new Random();

14                 for (int i = 0; i < 2; i++)

15                 {

16                     int x1 = rnd.Next(bmp.Width);

17                     int y1 = rnd.Next(bmp.Height);

18                     int x2 = rnd.Next(bmp.Width);

19                     int y2 = rnd.Next(bmp.Height);

20                     g.DrawLine(new Pen(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))), x1, y1, x2, y2);

21                 }

22                 g.DrawRectangle(new Pen(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))), new Rectangle(0, 0, bmp.Width - 1, bmp.Height - 1));

23                 for (int i = 0; i < 25; i++)

24                 {

25                     bmp.SetPixel(rnd.Next(bmp.Width), rnd.Next(bmp.Height), Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255)));

26                 }

27                 for (int i = 0; i < validateCode.Length; i++)

28                 {

29                     FontFamily[] familys = FontFamily.Families;

30                     FontFamily family = familys[rnd.Next(familys.Length)];

31                     g.DrawString(validateCode[i].ToString(), new Font(family, 14, FontStyle.Bold), new SolidBrush(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))), new PointF(1 + i * 15, 1));

32                 }

33 

34                 //保存图片数据

35                 MemoryStream stream = new MemoryStream();

36                 bmp.Save(stream, ImageFormat.Jpeg);

37 

38                 //  输出图片流

39                 return stream.ToArray();

40             }

41         }

生成验证码图片

 1      /// <summary>

 2         /// 验证码

 3         /// </summary>

 4         /// <returns></returns> 

 5         public ActionResult VerifyCode()

 6         {

 7             h.Base.Public.SecurityCode seCode = new h.Base.Public.SecurityCode();

 8             var code = seCode.GetCode();

 9             Session["code"] = code;

10             var bytes = seCode.ProcessRequestImage(code);

11             return File(bytes, "image/jpeg");

12         }

控制器代码

 1   <div class="pdiv">

 2                 <input type="image" id="valiCode"     src="/Based/VerifyCode" />

 3 </div>

 4 

 5 <script>

 6     (function () {

 7   //刷新验证码

 8         var codeUrl = "/Based/VerifyCode";

 9         $(valiCode).on("click", function () {

10             this.src = codeUrl + "?time=" + (new Date()).getTime();

11         });

12 

13     })(jQuery)

14 </script>

view视图代码

 这段代码我测试过了。。  是可以通过的。