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  • ASP.NET MVC 生成验证码

    using System.Web.Mvc;
    using System.Drawing;
    using System;
    using System.Drawing.Imaging;
    using Models;
    using System.IO;
    
    namespace MvcApp.Controllers
    {
        /// <summary>
        /// 用户账户信息
        /// </summary>
        [HandleError]
        public class AccountController : BaseController
        {
            /// <summary>
            /// 获取验证码图片
            /// </summary>
            /// <returns></returns>
            public ActionResult ValidateCode()
            {
                //生成验证码字符
                string vnum = GetByRndNum(4);
                int width = vnum.Length * 17;
    
                Graphics g = null; //画布
                Bitmap bitmap = new Bitmap(width, 32); //图片
                g = Graphics.FromImage(bitmap);
                g.Clear(Color.White); //设定背景色            
    
                Font font = new Font("微软雅黑", 16, FontStyle.Bold);
                SolidBrush brush = new SolidBrush(ColorTranslator.FromHtml("#411464"));
                g.DrawString(vnum, font, brush, 1, 1);  //画数字
    
                // 随机产生干扰线,使图象中的认证码不易被其它程序探测到
                Random random = new Random();
                Pen pen = new Pen(ColorTranslator.FromHtml("lightblue"), 18);
                for (int i = 0; i < 8; i++)
                {
                    int x = random.Next(width);
                    int y = random.Next(20);
                    int xstep = random.Next(6);
                    int ystep = random.Next(2);
                    g.DrawLine(pen, x + 1, y, x + xstep, y + ystep);
                }
    
                //画矩形边框
                pen.Width = 1;
                g.DrawRectangle(pen, 0, 0, bitmap.Width - 1, bitmap.Height - 1);
    
                MemoryStream ms = new MemoryStream();
                bitmap.Save(ms, ImageFormat.Jpeg);
    
                //也可以直接保存到响应流中
                //Response.ClearContent(); //需要输出图象信息 要修改HTTP头 
                //Response.ContentType = "image/jpeg";
                //bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);
    
                g.Dispose();
                bitmap.Dispose();
                font.Dispose();
                brush.Dispose();
                pen.Dispose();
    
                return File(ms.ToArray(), "image/jpeg");
            }
    
            /// <summary>
            /// 随机生成验证码(数字)
            /// </summary>
            /// <param name="VcodeNum"></param>
            /// <returns></returns>
            public string GetByRndNum(int VcodeNum)
            {
                string VNum = "";
                string VcArray = "0123456789";
    
                Random rand = new Random();
    
                for (int i = 0; i < VcodeNum; i++)
                {
                    VNum += VcArray[rand.Next(0, 9)];
                }
    
                Session["__VCode"] = VNum;
    
                return VNum;
            }
        }
    }

    附:验证码操作简易封装

    using System;
    using System.Drawing;
    using System.Web;
    
    namespace Utility
    {
        public class VerifyCode
        {
            #region 验证码长度(默认6个验证码的长度)
            int length = 4;
            public int Length
            {
                get { return length; }
                set { length = value; }
            }
            #endregion
    
            #region 验证码字体大小(为了显示扭曲效果,默认40像素,可以自行修改)
            int fontSize = 60;
            public int FontSize
            {
                get { return fontSize; }
                set { fontSize = value; }
            }
            #endregion
    
            #region 边框补(默认1像素)
            int padding = 2;
            public int Padding
            {
                get { return padding; }
                set { padding = value; }
            }
            #endregion
    
            #region 是否输出燥点(默认不输出)
            bool chaos = true;
            public bool Chaos
            {
                get { return chaos; }
                set { chaos = value; }
            }
            #endregion
    
            #region 输出燥点的颜色(默认灰色)
            Color chaosColor = Color.LightGray;
            public Color ChaosColor
            {
                get { return chaosColor; }
                set { chaosColor = value; }
            }
            #endregion
    
            #region 自定义背景色(默认白色)
            Color backgroundColor = Color.White;
            public Color BackgroundColor
            {
                get { return backgroundColor; }
                set { backgroundColor = value; }
            }
            #endregion
    
            #region 自定义随机颜色数组
            Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
            public Color[] Colors
            {
                get { return colors; }
                set { colors = value; }
            }
            #endregion
    
            #region 自定义字体数组
            string[] fonts = { "Arial", "Georgia" };
            public string[] Fonts
            {
                get { return fonts; }
                set { fonts = value; }
            }
            #endregion
    
            #region 自定义随机码字符串序列(使用逗号分隔)
            string codeSerial = "1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";
            //string codeSerial = "0,1,2,3,4,5,6,7,8,9";
            public string CodeSerial
            {
                get { return codeSerial; }
                set { codeSerial = value; }
            }
            #endregion
    
            #region 产生波形滤镜效果
    
            private const double PI = 3.1415926535897932384626433832795;
            private const double PI2 = 6.283185307179586476925286766559;
    
            /// <summary>
            /// 正弦曲线Wave扭曲图片(Edit By 51aspx.com)
            /// </summary>
            /// <param name="srcBmp">图片路径</param>
            /// <param name="bXDir">如果扭曲则选择为True</param>
            /// <param name="nMultValue">波形的幅度倍数,越大扭曲的程度越高,一般为3</param>
            /// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>
            /// <returns></returns>
            public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
            {
                System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
    
                // 将位图背景填充为白色
                System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
                graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
                graph.Dispose();
    
                double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
    
                for (int i = 0; i < destBmp.Width; i++)
                {
                    for (int j = 0; j < destBmp.Height; j++)
                    {
                        double dx = 0;
                        dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
                        dx += dPhase;
                        double dy = Math.Sin(dx);
    
                        // 取得当前点的颜色
                        int nOldX = 0, nOldY = 0;
                        nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
                        nOldY = bXDir ? j : j + (int)(dy * dMultValue);
    
                        System.Drawing.Color color = srcBmp.GetPixel(i, j);
                        if (nOldX >= 0 && nOldX < destBmp.Width
                         && nOldY >= 0 && nOldY < destBmp.Height)
                        {
                            destBmp.SetPixel(nOldX, nOldY, color);
                        }
                    }
                }
    
                return destBmp;
            }
    
    
    
            #endregion
    
            #region 生成校验码图片
            public Bitmap CreateImageCode(string code)
            {
                int fSize = FontSize;
                int fWidth = fSize + Padding;
    
                int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
                int imageHeight = fSize * 2 + Padding;
    
                System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
    
                Graphics g = Graphics.FromImage(image);
    
                g.Clear(BackgroundColor);
    
                Random rand = new Random();
    
                //给背景添加随机生成的燥点以及噪音线
                if (this.Chaos)
                {
    
                    Pen pen = new Pen(ChaosColor, 0);
                    int c = Length * 60;
    
                    for (int i = 0; i < c; i++)
                    {
                        int x = rand.Next(image.Width);
                        int y = rand.Next(image.Height);
    
                        g.DrawRectangle(pen, x, y, 1, 1);
                    }
                    int x1;
                    int y1;
                    int x2;
                    int y2;
                    for (int i = 0; i < 15; ++i)
                    {
                        x1 = rand.Next(image.Width);
                        y1 = rand.Next(image.Height);
                        x2 = rand.Next(image.Width);
                        y2 = rand.Next(image.Height);
                        g.DrawLine(new Pen(Color.FromArgb(rand.Next(255), rand.Next(255), rand.Next(255))), x1, y1, x2, y2);
                    }
                }
    
                int left = 0, top = 0, top1 = 1, top2 = 1;
    
                int n1 = (imageHeight - FontSize - Padding * 2);
                int n2 = n1 / 4;
                top1 = n2;
                top2 = n2 * 2;
    
                Font f;
                Brush b;
    
                int cindex, findex;
    
                //随机字体和颜色的验证码字符
                for (int i = 0; i < code.Length; i++)
                {
                    cindex = rand.Next(Colors.Length - 1);
                    findex = rand.Next(Fonts.Length - 1);
    
                    f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
                    b = new System.Drawing.SolidBrush(Colors[cindex]);
    
                    if (i % 2 == 1)
                    {
                        top = top2;
                    }
                    else
                    {
                        top = top1;
                    }
    
                    left = i * fWidth;
    
                    g.DrawString(code.Substring(i, 1), f, b, left, top);
                }
    
                //产生波形(Add By 51aspx.com)
                //image = TwistImage(image, true, 10, rand.NextDouble() * 4 + 2);
    
                //画一个边框 边框颜色为Color.Gainsboro
                g = Graphics.FromImage(image);
                g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
                g.Dispose();
    
    
    
                return image;
            }
            #endregion
    
            #region 将创建好的图片输出到页面
            public void CreateImageOnPage(string code, HttpContext context)
            {
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                Bitmap image = this.CreateImageCode(code);
    
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
    
                context.Response.ClearContent();
                context.Response.Expires = -1;
                context.Response.CacheControl = "no-cache";
                context.Response.ContentType = "image/Jpeg";
                context.Response.BinaryWrite(ms.GetBuffer());
    
                ms.Close();
                ms = null;
                image.Dispose();
                image = null;
            }
            #endregion
    
            #region 生成随机字符码
            public string CreateVerifyCode(int codeLen)
            {
                if (codeLen == 0)
                {
                    codeLen = Length;
                }
    
                string[] arr = CodeSerial.Split(',');
    
                string code = "";
    
                int randValue = -1;
    
                Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
    
                for (int i = 0; i < codeLen; i++)
                {
                    randValue = rand.Next(0, arr.Length - 1);
    
                    code += arr[randValue];
                }
    
                return code;
            }
            public string CreateVerifyCode()
            {
                return CreateVerifyCode(0);
            }
            #endregion
        }
    }
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  • 原文地址:https://www.cnblogs.com/hellowzl/p/9071680.html
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