首页 / 网页编程 / ASP.NET / asp.net mvc验证码类使用

namespace QJW.VerifyCode{//用法：//public FileContentResult CreateValidate（）//{//ValidateCode vCode = new ValidateCode（）;//string code = vCode.CreateValidateCode（5）;//Session["ValidateCode"] = code;//byte[] bytes = vCode.CreateValidateGraphic（code）;//return File（bytes, "image/JPEG"）;//}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="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（）;}}/// <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;}}}

public FileContentResult CreateValidate（）{ValidateCode vCode = new ValidateCode（）;string code = vCode.CreateValidateCode（5）;Session["ValidateCode"] = code;byte[] bytes = vCode.CreateValidateGraphic（code）;return File（bytes, "image/JPEG"）;}

function reloadcode（） {var verify = document.getElementById（"safecode"）;verify.setAttribute（"src", "/common/CreateValidate?" + Math.random（））;}