.net处理程序生成随机6位图片验证码,大家参考使用吧

代码如下: /// summary /// PicHandler1 的摘要说明 /// /summary public class PicHandler1 : IHttpHandler, IRequiresSessionState { private string mCheckNo = string.Empty; protected ImgBuilder _ImgBuilder = new ImgBuilder(); protected VryImgGen _ImgBuilderNew = new VryImgGen(); private string _text = string.Empty; private string _font = "宋体"; private int _fontSize = 8; private int _padding = 2; public void ProcessRequest(HttpContext context) { mCheckNo = DisCheckNo(); context.Session["CheckCode"] = mCheckNo; this._ImgBuilder.FontSize = this._fontSize; this._ImgBuilder.Padding = this._padding; if (!string.IsNullOrEmpty(this._font)) { this._ImgBuilder.Fonts = new string[] { this._font }; } this._ImgBuilderNew.ChaosWight = 40; this._ImgBuilderNew.FontSize = 25; this._ImgBuilderNew.Padding = 3; System.Drawing.Bitmap image = this._ImgBuilderNew.CreateImage(mCheckNo); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); context.Response.ClearContent(); context.Response.ContentType = "image/Jpeg"; context.Response.BinaryWrite(ms.ToArray()); context.Session["CheckCode"] = mCheckNo.ToString(); //如果没有实现IRequiresSessionState，则这里会出错，也无法生成图片 context.Response.End(); } //验证码生成 protected string DisCheckNo() { string hash = HashCode.GetNext(); string CheckNo = string.Empty; Random rd = new Random(DateTime.Now.Millisecond); for (int i = 0; i i++) { CheckNo += hash.Substring(rd.Next(1, hash.Length - 1), 1); } CheckNo = CheckNo.Replace("0", rd.Next(1, 9).ToString()); CheckNo = CheckNo.Replace("o", rd.Next(1, 9).ToString()); CheckNo = CheckNo.Replace("O", rd.Next(1, 9).ToString()); return CheckNo; } public bool IsReusable { get { return false; } } } 调用的类 代码如下: using System; using System.Drawing; using System.Text; /// summary /// VryImgGen 的摘要说明 /// /summary public class VryImgGen { public static string ChineseChars = String.Empty; /// summary /// 英文与数字串 /// /summary protected static readonly string EnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; public VryImgGen() { rnd = new Random(unchecked((int)DateTime.Now.Ticks)); } /// summary /// 全局随机数生成器 /// /summary private Random rnd; int length = 5; /// summary /// 验证码长度(默认6个验证码的长度) /// /summary public int Length { get { return length; } set { length = value; } } int fontSize = 20; /// summary /// 验证码字体大小(为了显示扭曲效果，默认30像素，可以自行修改) /// /summary public int FontSize { get { return fontSize; } set { fontSize = value; } } int padding = 4; /// summary /// 边框补(默认4像素) /// /summary public int Padding { get { return padding; } set { padding = value; } } bool chaos = true; /// summary /// 是否输出燥点(默认输出) /// /summary public bool Chaos { get { return chaos; } set { chaos = value; } } Color chaosColor = Color.LightGray; /// summary /// 输出燥点的颜色(默认灰色) /// /summary public Color ChaosColor { get { return chaosColor; } set { chaosColor = value; } } int chaosWight = 1; /// summary /// 输出燥点的浓度 /// /summary public int ChaosWight { get { return chaosWight; } set { chaosWight = value; } } Color backgroundColor = Color.White; /// summary /// 自定义背景色(默认白色) /// /summary public Color BackgroundColor { get { return backgroundColor; } set { backgroundColor = value; } } Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; /// summary /// 自定义随机颜色数组 /// /summary public Color[] Colors { get { return colors; } set { colors = value; } } string[] fonts = { "Arial", "Georgia" }; /// summary /// 自定义字体数组 /// /summary public string[] Fonts { get { return fonts; } set { fonts = value; } } #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 & destBmp.Width &= 0 & destBmp.Height) { destBmp.SetPixel(nOldX, nOldY, color); } } } return destBmp; } #endregion /// summary /// 生成校验码图片 /// /summary /// param name="code"验证码/param /// returns/returns public Bitmap CreateImage(string code) { int fSize = FontSize; int fWidth = fSize + Padding; int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2; int imageHeight = fSize * 2 + Padding * 2; System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth - 10, imageHeight - 10); Graphics g = Graphics.FromImage(image); g.Clear(BackgroundColor); //给背景添加随机生成的燥点 if (this.Chaos) { Pen pen = new Pen(ChaosColor, 0); int c = ChaosWight * 10; for (int i = 0; i i++) { int x = rnd.Next(image.Width); int y = rnd.Next(image.Height); g.DrawRectangle(pen, x, y, 1, 1); } } 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 = rnd.Next(Colors.Length - 1); findex = rnd.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); } //画一个边框 边框颜色为Color.Gainsboro g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1); g.Dispose(); //产生波形（Add By 51aspx.com） image = TwistImage(image, true, 8, 4); return image; } /// summary /// 生成随机字符码 /// /summary /// param name="codeLen"字符串长度/param /// param name="zhCharsCount"中文字符数/param /// returns/returns public string CreateVerifyCode(int codeLen, int zhCharsCount) { char[] chs = new char[codeLen]; int index; for (int i = 0; i zhCharsCount; i++) { index = rnd.Next(0, codeLen); if (chs[index] == '') chs[index] = CreateZhChar(); else --i; } for (int i = 0; i codeLen; i++) { if (chs[i] == '') chs[i] = CreateEnOrNumChar(); } return new string(chs, 0, chs.Length); } /// summary /// 生成默认长度5的随机字符码 /// /summary /// returns/returns public string CreateVerifyCode() { return CreateVerifyCode(Length, 0); } /// summary /// 生成英文或数字字符 /// /summary /// returns/returns protected char CreateEnOrNumChar() { return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)]; } /// summary /// 生成汉字字符 /// /summary /// returns/returns protected char CreateZhChar() { //若提供了汉字集，查询汉字集选取汉字 if (ChineseChars.Length 0) { return ChineseChars[rnd.Next(0, ChineseChars.Length)]; } //若没有提供汉字集，则根据《GB2312简体中文编码表》编码规则构造汉字 else { byte[] bytes = new byte[2]; //第一个字节值在0xb0, 0xf7之间 bytes[0] = (byte)rnd.Next(0xb0, 0xf8); //第二个字节值在0xa1, 0xfe之间 bytes[1] = (byte)rnd.Next(0xa1, 0xff); //根据汉字编码的字节数组解码出中文汉字 string str1 = Encoding.GetEncoding("gb2312").GetString(bytes); return str1[0]; } } }