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  • 很不错的验证码显示页

    很不错的验证码显示页

    getCode.aspx

    程序代码 程序代码
    using System;
    using System.Drawing;

    public partial class Control_getCode : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            createCheckCode(getCode(4));
        }
        private string getCode(int num)
        {
            string codeStr = string.Empty;
            //为了方便识别去除了 零 和 英文O
            string codeStrTmp = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z,1,2,3,4,5,6,7,8,9";
            string[] codeArr = codeStrTmp.Split(',');
            Random rad = new Random();
            for (int i = 0; i < num; i++)
            {
                codeStr += codeArr[rad.Next(codeArr.Length)];
            }
            Session["getCode"] = codeStr;
            return codeStr;
        }

        private void createCheckCode(string checkCode)
        {
            if (checkCode == null || checkCode.Trim() == string.Empty) return;

            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 20);
            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);
                //画图片的背景噪音线
                for (int i = 0; i < 2; 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.Black), x1, y1, x2, y2);
                }
                Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(checkCode, font, brush, 2, 2);
                //画图片的前景噪音点
                for (int i = 0; i < 50; 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);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                Response.ClearContent();
                Response.ContentType = "image/Gif";
                Response.BinaryWrite(ms.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
    }



    应用时加入 <img src="getCode.aspx" />

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  • 原文地址:https://www.cnblogs.com/sontin/p/1929798.html
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