生成验证码
2016-07-15 17:05
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因为楼主运用的是MVC的方式绑定的所以获取方式如下:
img标签
id=”captcha_img”
onclick=”document.getElementById(‘captcha_img’).src=document.getElementById(‘captcha_img’).src+’?’” alt=”点击更换” title=”点击更换” src=”@Url.Action(“SecurityCode”)” class=”m”
**获取值 比较**TempData[“SecurityCode”];
img标签
id=”captcha_img”
onclick=”document.getElementById(‘captcha_img’).src=document.getElementById(‘captcha_img’).src+’?’” alt=”点击更换” title=”点击更换” src=”@Url.Action(“SecurityCode”)” class=”m”
**获取值 比较**TempData[“SecurityCode”];
region 生成验证码图片
// [OutputCache(Location = OutputCacheLocation.None, Duration = 0, NoStore = false)] public ActionResult SecurityCode() { string oldcode = TempData["SecurityCode"] as string; string code = CreateRandomCode(5); TempData["SecurityCode"] = code; return File(CreateValidateGraphic(code), "image/Jpeg"); } /// <summary> /// 创建验证码 /// </summary> private string CreateRandomCode(int codeCount) { string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z"; string[] allCharArray = allChar.Split(','); string randomCode = ""; int temp = -1; Random rand = new Random(); for (int i = 0; i < codeCount; i++) { if (temp != -1) { rand = new Random(i * temp * ((int)DateTime.Now.Ticks)); } int t = rand.Next(35); if (temp == t) { return CreateRandomCode(codeCount); } temp = t; randomCode += allCharArray[t]; } return randomCode; } /// <summary> /// 创建验证码的图片 /// </summary> public byte[] CreateValidateGraphic(string validateCode) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 16.0), 27); 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", 13, (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(); } } #endregion
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