//创建验证码 public static string CreateValidateCode() { string checkCode = string.Empty; Random rnd = new Random(DateTime.Now.Millisecond); char[] chr = { 'A', 'a', 'B', 'b', 'C', 'c', 'D', 'd', 'E', 'e', 'F', 'f', 'G', 'g', 'H', 'h', 'I', 'i', 'J', 'j', 'K', 'k', 'L', 'l', 'M', 'm', 'N', 'n', 'O', 'o', 'P', 'p', 'Q', 'q', 'R', 'r', 'S', 's', 'T', 't', 'U', 'u', 'V', 'v', 'W', 'w', 'X', 'x', 'Y', 'y', 'Z', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; for (int i = 0; i < 5; i++) { checkCode += chr[rnd.Next(chr.Length)]; } return checkCode; }
//根据验证码画图片 public static byte[] CreateValidateGraphic(string validateCode) { Bitmap bmp = new Bitmap(80, 24); Graphics g = Graphics.FromImage(bmp); MemoryStream ms = new MemoryStream(); try { Random random = new Random(DateTime.Now.Millisecond); g.Clear(Color.White); for (int i = 0; i < 6; i++) { int x1 = random.Next(bmp.Width); int x2 = random.Next(bmp.Width); int y1 = random.Next(bmp.Height); int y2 = random.Next(bmp.Height); int Color_r = random.Next(255); int Color_g = random.Next(255); int Color_b = random.Next(255); g.DrawLine(new Pen(Color.FromArgb(Color_r, Color_g, Color_b)), x1, y1, x2, y2); } g.DrawString(validateCode, new Font(FontFamily.GenericSerif, 16), Brushes.Black, 0, 0); bmp.Save(ms, ImageFormat.Jpeg); return ms.ToArray(); } finally { g.Dispose(); bmp.Dispose(); } }
1 //mvc调用
2 public ActionResult GetValidateCode()
3 {
4 Session["CheckCode"] = null;
5 string checkCode = WebUtility.CreateValidateCode();
6 byte[] bytes = WebUtility.CreateValidateGraphic(checkCode);
7 Session["CheckCode"] = checkCode;
8 return File(bytes, @"image/jpeg");
9 }
1 <div class="jumbotron"> 2 <p>验证码:<img alt="" align="middle" id="valiCode" /></p> 3 </div> 4 <script type="text/javascript"> 5 $(function () { 6 $("#valiCode").bind("click", function () { 7 this.src = "/Account/GetValidateCode?time=" + (new Date()).getTime(); 8 }); 9 $("#valiCode").click(); 10 }); 11 </script>