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      asp.net mvc 验证码
      发布时间:2016-12-28 19:53:17 关键词: asp.net验证码类
      内容简介:asp.net mvc 验证码
    验证码类
    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;
            }
        }
    <p>
    	}
    </p>
    

    使用方法

    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");
            }
    HTML 
    <a href="javascript:;" onclick="reloadcode();"><img id="safecode" src="/common/CreateValidate" alt="" /></a> 

    视图JS

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


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