结合从网上收集的代码，整理了验证码生成的功能。
源代码来源于网络，个人进行了综合更改，非原创
Code/**//// <summary>
/// 生成随机验证码
/// </summary>
public class VerifyCode 
{ private Random rnd = new Random(unchecked((int)DateTime.Now.Ticks)); private String _cookieName = "CheckCode"; public String CookieName
{ get { return _cookieName; } set { _cookieName = value; }
} 属性变量#region 属性变量 /**//// <summary> /// 画图片的背景噪音线 /// </summary> private bool _chaoLine = false; /**//// <summary> /// 产生波形 /// </summary> private bool _chaoWave = false; /**//// <summary> /// 是否输出燥点(默认不输出) /// </summary> bool _chaoPoint = false; /**//// <summary> /// 验证码大小 /// </summary> int _fontSize = 30; /**//// <summary> /// 边框 /// </summary> int _padding = 2; /**//// <summary> /// 噪点颜色 /// </summary> Color _chaoPointColor = Color.LightGray; /**//// <summary> /// 噪点数量 /// </summary> int _chaoPointCount = 100; /**//// <summary> /// 背景颜色 /// </summary> Color _backgroundColor = Color.White; /**//// <summary> /// 颜色数组 /// </summary> Color[] _colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; /**//// <summary> /// 字体数组 /// </summary> string[] _fonts = { "Arial", "Georgia", "宋体", "黑体" }; #endregion 公共属性设置#region 公共属性设置 /**//// <summary> /// 产生波形扭曲 /// </summary> public bool ChaoWave { get { return _chaoWave; } set { _chaoWave = value; } } /**//// <summary> /// 画图片的背景噪音线 /// </summary> public bool ChaoLine { get { return _chaoLine; } set { _chaoLine = value; } } /**//// <summary> /// 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) /// 验证码字体大小(默认为40默认40像素) /// </summary> public int FontSize { get { return _fontSize; } set { _fontSize = value; } } /**//// <summary> /// 边框像素(默认为2) /// </summary> public int Padding { get { return _padding; } set { _padding = value; } } /**//// <summary> /// 是否输出燥点（默认为不是） /// </summary> public bool ChaoPoint { get { return _chaoPoint; } set { _chaoPoint = value; } } /**//// <summary> /// 输出燥点的颜色(默认Color.LightGray) /// </summary> public Color ChaoPointColor { get { return _chaoPointColor; } set { _chaoPointColor = value; } } /**//// <summary> /// 燥点数量（默认为100） /// </summary> public int ChaoPointCount { get { return _chaoPointCount; } set { _chaoPointCount = value; } } /**//// <summary> /// 背景颜色，默认为白色 /// </summary> public Color BackgroundColor { get { return _backgroundColor; } set { _backgroundColor = value; } } /**//// <summary> /// 随机颜色数组Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple /// </summary> public Color[] Colors { get { return _colors; } set { _colors = value; } } /**//// <summary> /// 字体数组"Arial", "Georgia", "宋体", "黑体" /// </summary> public string[] Fonts { get { return _fonts; } set { _fonts = value; } } #endregion 产生波形滤镜效果并画一个边框#region 产生波形滤镜效果并画一个边框 // <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> private Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase) { //const double PI = 3.1415926535897932384626433832795; const double PI2 = 6.283185307179586476925286766559; Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height); // 将位图背景填充为白色 Graphics g = System.Drawing.Graphics.FromImage(destBmp); g.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height); 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); } } } //渐变效果 //g.FillRectangle(new LinearGradientBrush(new Point(0, 0), new Point(destBmp.Width, destBmp.Height), Color.FromArgb(0, 0, 0, 0), Color.FromArgb(255, 255, 255, 255)), 0, 0, destBmp.Width, destBmp.Height); //画边框 g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, destBmp.Width - 1, destBmp.Height - 1); g.Dispose(); return destBmp; } #endregion 生成验证码码图片#region 生成验证码码图片 /**//// <summary> /// 画图片的背景噪音线 /// </summary> /// <param name="image"></param> /// <param name="g"></param> private void CreateImageLine(Bitmap image, Graphics g) { if (_chaoLine) { for (int i = 0; i < 25; i++) { int x1 = rnd.Next(image.Width); int x2 = rnd.Next(image.Width); int y1 = rnd.Next(image.Height); int y2 = rnd.Next(image.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); } } } /**//// <summary> /// 写入每一个字符 /// </summary> /// <param name="code"></param> /// <param name="fSize"></param> /// <param name="imageHeight"></param> /// <param name="g"></param> private void CreateImageString(string code, int fSize, int imageHeight, Graphics g) { //定义位移（左右，上下) int left = 0, top = 0, top1 = 1, top2 = 1; // int n2 = (imageHeight - FontSize - Padding * 2) / 5; top1 = n2; top2 = n2 * 2; Font f; Brush b; int cindex, findex;//颜色和字体 for (int i = 0; i < code.Length; i++) { cindex = rnd.Next(Colors.Length - 1);//从颜色数组中随机取出一个 findex = rnd.Next(Fonts.Length - 1); //从字体数组中随机取出一个 f = new Font(Fonts[findex], fSize, FontStyle.Bold); b = new SolidBrush(Colors[cindex]); //产生、随机移位 if (i % 2 == 1) { top = top2; } else { top = top1; } int sub; sub = rnd.Next(4, 8); if (sub > 5) { sub = -sub; } //--------- if (i != 0) //第一个字不位移 { left = i * (FontSize + Padding) + sub; top += sub; } //---------- /**////添加文本字符串 left = i * (FontSize + Padding); top = Padding; g.DrawString(code.Substring(i, 1), f, b, left, top); } } /**//// <summary> /// 生成随机噪点 /// </summary> /// <param name="image"></param> /// <param name="g"></param> private void CreateImagePoint(Bitmap image, Graphics g) { if (_chaoPoint) { Pen pen = new Pen(ChaoPointColor, 0); int c = _chaoPointCount; for (int i = 0; i < c; i++) { int x = rnd.Next(image.Width); int y = rnd.Next(image.Height); g.DrawRectangle(pen, x, y, 1, 1); } } } /**//// <summary> /// 生成扭曲变形 /// </summary> /// <param name="image"></param> /// <returns></returns> private Bitmap CreateImageWave(Bitmap image) { if (_chaoWave) { //随机生成后三个参数(true or false,5~8，(0~2PI),) int _int1 = rnd.Next(4, 10); int _int2 = rnd.Next(1, 6); bool _bool = _int2 > 3 ? true : false; image = TwistImage(image, _bool, _int1, _int2); } return image; } /**//// <summary> /// 生成验证码图片 /// </summary> /// <param name="code">验证码</param> /// <returns>返回Bitmap</returns> private Bitmap CreateImageCode(string code) { //字体大小 int fSize = FontSize + Padding; //图片宽度 int imageWidth = (int)(code.Length * fSize) + 10 + Padding * 2; //图片高度 int imageHeight = FontSize * 2 + Padding; //创建图像 Bitmap image = new Bitmap(imageWidth, imageHeight); // 填充背景颜色 Graphics g = Graphics.FromImage(image); g.Clear(BackgroundColor); CreateImageLine(image, g); CreateImageString(code, fSize, imageHeight, g); CreateImagePoint(image, g); image = CreateImageWave(image); //g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); g.Dispose(); return image; } #endregion 将创建好的图片输出到页面#region 将创建好的图片输出到页面 /**//**/ /**//// <summary> /// 把字符图片输出到页面 /// </summary> /// <param name="code">字符</param> /// <param name="context">页面</param> public void CreateImageOnPage(string code, System.Web.HttpContext httpcontext) { System.IO.MemoryStream ms = new System.IO.MemoryStream(); Bitmap image = this.CreateImageCode(code); httpcontext.Response.Cookies.Add(new System.Web.HttpCookie(_cookieName, code)); image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); httpcontext.Response.ClearContent(); httpcontext.Response.ContentType = "image/Jpeg"; httpcontext.Response.BinaryWrite(ms.GetBuffer()); ms.Close(); ms = null; image.Dispose(); image = null; } #endregion /**//// <summary> /// 生成汉字验证码 /// </summary> /// <param name="nLength"></param> /// <param name="page"></param> public void GNChinese(Int32 nLength, System.Web.HttpContext httpcontext) { 产生中文#region 产生中文 //获取GB2312编码页（表） Encoding gb = Encoding.GetEncoding("gb2312"); //定义一个字符串数组储存汉字编码的组成元素 string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; Random rnd = new Random(); //定义一个object数组用来 //String[] StrCode=new String[strlength]; String StrCode = ""; /**//**/ /**//*每循环一次产生一个含两个元素的十六进制字节数组，并将其放入bject数组中 每个汉字有四个区位码组成 区位码第1位和区位码第2位作为字节数组第一个元素 区位码第3位和区位码第4位作为字节数组第二个元素 */ for (int i = 0; i < nLength; i++) { //区位码第1位 int r1 = rnd.Next(11, 14); string str_r1 = rBase[r1].Trim(); //区位码第2位 rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的种子避免产生重复值 int r2; if (r1 == 13) { r2 = rnd.Next(0, 7); } else { r2 = rnd.Next(0, 16); } string str_r2 = rBase[r2].Trim(); //区位码第3位 rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i); int r3 = rnd.Next(10, 16); string str_r3 = rBase[r3].Trim(); //区位码第4位 rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i); int r4; if (r3 == 10) { r4 = rnd.Next(1, 16); } else if (r3 == 15) { r4 = rnd.Next(0, 15); } else { r4 = rnd.Next(0, 16); } string str_r4 = rBase[r4].Trim(); //定义两个字节变量存储产生的随机汉字区位码 byte byte1 = Convert.ToByte(str_r1 + str_r2, 16); byte byte2 = Convert.ToByte(str_r3 + str_r4, 16); //将两个字节变量存储在字节数组中 byte[] str_r = new byte[] { byte1, byte2 }; //根据汉字编码的字节数组解码出中文汉字 String character = gb.GetString((byte[])Convert.ChangeType(str_r, typeof(byte[]))); //将产生的一个汉字的字节数组放入object数组中 StrCode += character; //StrCode.SetValue(character, i); } #endregion CreateImageOnPage(StrCode, httpcontext); } /**//// <summary> /// 生成字母和数字混合验证码图像 /// </summary> /// <param name="nLength"></param> /// <param name="httpcontext"></param> public void GNCode(Int32 nLength,System.Web.HttpContext httpcontext) { CreateImageOnPage(RndNum(nLength), httpcontext); } /**//// <summary> /// 生成字母和数字混合验证码 /// </summary> /// <param name="VcodeNum"></param> /// <returns></returns> private string RndNum(int VcodeNum) { string Vchar = "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,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q" + ",R,S,T,U,V,W,X,Y,Z"; string[] VcArray = Vchar.Split(new Char[] { ',' });//拆分成数组 string VNum = ""; int temp = -1;//记录上次随机数值，尽量避避免生产几个一样的随机数 Random rand = new Random(); //采用一个简单的算法以保证生成随机数的不同 for (int i = 1; i < VcodeNum + 1; i++) { if (temp != -1) { rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks)); } int t = rand.Next(61); if (temp != -1 && temp == t) { return RndNum(VcodeNum); } temp = t; VNum += VcArray[t]; } return VNum; } }
