创建一个验证码图片类
using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Drawing; using System.Drawing.Imaging; using System.Drawing.Drawing2D; using System.IO; namespace lishuhua { public partial class Validator : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //GenerateValidateCode(); GenerateVerifyImage(4);//GenerateVerifyImage(int length) } #region 【无刷新仿google波形扭曲彩色】验证码样式0___GenerateValidateCode() private void GenerateValidateCode() { this.Length = this.length; this.FontSize = this.fontSize; this.Chaos = this.chaos; this.BackgroundColor = this.backgroundColor; this.ChaosColor = this.chaosColor; this.CodeSerial = this.codeSerial; this.Colors = this.colors; this.Fonts = this.fonts; this.Padding = this.padding; string VNum = this.CreateVerifyCode(); //取随机码 Session["ValidateCode"] = VNum.ToUpper();//取得验证码，以便后来验证 this.CreateImageOnPage(VNum, this.Context); // 输出图片 //Cookie验证模式， 使用Cookies取验证码的值 //Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper())); } #endregion #region 验证码长度(默认4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 = 22; 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 = "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"; 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 /// </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 Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase) { Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height); // 将位图背景填充为白色 System.Drawing.Graphics graph = Graphics.FromImage(destBmp); graph.FillRectangle(new SolidBrush(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 if (this.Chaos) { Pen pen = new Pen(ChaosColor, 0); int c = Length * 10; 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 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); } //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, 4, 4); return image; } #endregion #region 将创建好的图片输出到页面 public void CreateImageOnPage(string code, HttpContext context) { Response.BufferOutput = true; //特别注意 Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));//特别注意 Response.Cache.SetCacheability(HttpCacheability.NoCache);//特别注意 Response.AppendHeader("Pragma", "No-Cache"); //特别注意 MemoryStream ms = new MemoryStream(); Bitmap image = this.CreateImageCode(code); image.Save(ms, ImageFormat.Jpeg); Response.ClearContent(); Response.ContentType = "image/JPEG"; Response.BinaryWrite(ms.ToArray()); Response.End(); 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 #region 另一种验证码样式 GenerateVerifyImage(int length) /// <summary> /// 将创建好的图片输出到页面 /// </summary> public void GenerateVerifyImage(int nLen) { string validateCode = "";//生成的验证码 int nBmpWidth = GetImagewidth(nLen); int nBmpHeight = GetImageHeight(); System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(nBmpWidth, nBmpHeight); //对图像进行弯曲 TwistImage(bmp, true, 12, 2); // 1. 生成随机背景颜色 int nRed, nGreen, nBlue; // 背景的三元色 System.Random rd = new Random((int)System.DateTime.Now.Ticks); nRed = rd.Next(255) % 128 + 128; nGreen = rd.Next(255) % 128 + 128; nBlue = rd.Next(255) % 128 + 128; // 2. 填充位图背景 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(bmp); graph.FillRectangle(new SolidBrush(System.Drawing.Color.FromArgb(nRed, nGreen, nBlue)) , 0 , 0 , nBmpWidth , nBmpHeight); // 3. 绘制干扰线条，采用比背景略深一些的颜色 int nLines = 3; System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Color.FromArgb(nRed - 17, nGreen - 17, nBlue - 17), 2); for (int a = 0; a < nLines; a++) { int x1 = rd.Next() % nBmpWidth; int y1 = rd.Next() % nBmpHeight; int x2 = rd.Next() % nBmpWidth; int y2 = rd.Next() % nBmpHeight; graph.DrawLine(pen, x1, y1, x2, y2); } // 采用的字符集，可以随即拓展，并可以控制字符出现的几率 string strCode = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; // 4. 循环取得字符，并绘制 for (int i = 0; i < nLen; i++) { int x = (i * 13 + rd.Next(3)); int y = rd.Next(4) + 1; // 确定字体 System.Drawing.Font font = new System.Drawing.Font("Courier New",//文字字体类型 12 + rd.Next() % 4,//文字字体大小 System.Drawing.FontStyle.Bold);//文字字体样式 char c = strCode[rd.Next(strCode.Length)]; // 随机获取字符 validateCode += c.ToString(); // 绘制字符 graph.DrawString(c.ToString(), font, new SolidBrush(System.Drawing.Color.FromArgb(nRed - 60 + y * 3, nGreen - 60 + y * 3, nBlue - 40 + y * 3)), x, y); } Session["ValidateCode"] = validateCode; //对图像进行弯曲 TwistImage(bmp, true, 4, 4); Response.BufferOutput = true; //特别注意 Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));//特别注意 Response.Cache.SetCacheability(HttpCacheability.NoCache);//特别注意 Response.AppendHeader("Pragma", "No-Cache"); //特别注意 // 5. 输出字节流 MemoryStream bstream = new MemoryStream(); bmp.Save(bstream, ImageFormat.Jpeg); Response.ClearContent(); Response.ContentType = "image/JPEG"; Response.BinaryWrite(bstream.ToArray()); Response.End(); bstream.Close(); bstream = null; bmp.Dispose(); bmp = null; graph.Dispose(); } ///<summary> ///得到验证码图片的宽度 ///</summary> ///<paramname="validateNumLength">验证码的长度</param> ///<returns></returns> public static int GetImagewidth(int validateNumLength) { return (int)(13 * validateNumLength + 5); } ///<summary> ///得到验证码的高度 ///</summary> ///<returns></returns> public static int GetImageHeight() { return 25; } #endregion } } ------------------------------------------------- <script language="javascript" type="text/javascript"> function DoFresh() { var verify = document.getElementById("Image1"); verify.setAttribute('src', 'Validator.aspx'); } </script> </head> <body> <form id="form1" runat="server"> <div>验证码：<asp:TextBox runat="server" vf="require" ID="txtValidator"></asp:TextBox><asp:Image ID="Image1" runat="server" /> <a href="javascript:DoFresh()">看不清，换一张</a>
因为代码较为经典，所以把它写一遍。供大家分享
注意，因为我是手打的，有些东西写的不完备。
另一版本
using System; using System.Collections; using System.Text; using System.Web; using System.Drawing; using System.Web.Caching; using System.Threading; using System.Configuration; using System.Collections.Specialized; using System.Xml; using System.IO; namespace ICS.FacadeClass { /// <summary> /// 验证码的生成处理类 /// zhangqs /// 2007-11-16 /// </summary> public class VerifyCode { #region 变量定义 private int maxLength = 4; private int minLength = 4; private string SessionKey = ""; #endregion #region 构造函数 /// <summary> /// 构造函数，支持动态个数字符，若固定字符数，则min=max /// </summary> /// <param name="minLen"></param> /// <param name="maxLen"></param> public VerifyCode(int minLen, int maxLen, string sessionKey) { this.SessionKey = sessionKey; this.maxLength = maxLen; this.minLength = minLen; //生成验证码 this.Code = createVerifyCode(); } /// <summary> /// 构造函数，支持动态个数字符，若固定字符数，则min=max /// </summary> /// <param name="minLen"></param> /// <param name="maxLen"></param> public VerifyCode(int minLen, int maxLen) { this.SessionKey = ""; this.maxLength = maxLen; this.minLength = minLen; //生成验证码 this.Code = createVerifyCode(); } #endregion #region 自定义随机码字符串序列(使用逗号分隔) string codeSerial = "3,4,5,6,7,8,A,B,C,E,F,H,K,M,P,Q,R,S,T,U,V,W,X,Y,a,b,c,d,e,f,h,k,m,p,q,s,t,u,v,w,x,y"; public string CodeSerial { get { return codeSerial; } set { codeSerial = "3,4,5,6,7,8,A,B,C,E,F,H,K,M,P,Q,R,S,T,U,V,W,X,Y,a,b,c,d,e,f,h,k,m,p,q,s,t,u,v,w,x,y"; } } #endregion #region 生成随机字符码 /// <summary> /// 生成随机字符码 /// </summary> /// <returns></returns> private string createVerifyCode() { //int len = this.minLength; Random rand = new Random(unchecked((int)DateTime.Now.Ticks)); //if (this.maxLength > this.minLength) //{ // len = rand.Next(this.minLength, this.maxLength + 1); //} //都用4字符 int len = 4; string[] arr = CodeSerial.Split(','); string code = ""; int randValue = -1; for (int i = 0; i < len; i++) { randValue = rand.Next(0, arr.Length - 1); code += arr[randValue]; } return code; } #endregion #region 验证码的值 private string _Code; /// <summary> /// 验证码的值 /// </summary> public string Code { get { return _Code; } set { _Code = value; } } #endregion #region 将创建好的图片输出到页面 public void CreateImageOnPage(HttpContext context) { #region 对调用页进行校验 System.Web.UI.Page page = (System.Web.UI.Page)System.Web.HttpContext.Current.Handler; if (SessionKey != "") { if (!this.IsCheckReferer) { page.Session[SessionKey] = this.Code; } else { if (this.MyDomain != this.RefererDomain) { page.Session[SessionKey] = System.Guid.NewGuid().ToString(); page.Response.End(); return; } else { page.Session[SessionKey] = this.Code; } } } #endregion Bitmap image = null; try { VerifyImg oVerifyImg = new VerifyImg(); image = oVerifyImg.CreateImageCode(this.Code); } catch { page.Session[SessionKey] = System.Guid.NewGuid().ToString(); page.Response.End(); } System.IO.MemoryStream srMS = new System.IO.MemoryStream(); image.Save(srMS, System.Drawing.Imaging.ImageFormat.Png); context.Response.ClearContent(); context.Response.ContentType = "image/Png"; context.Response.BinaryWrite(srMS.ToArray()); if (srMS != null) { srMS.Close(); srMS = null; } if (image != null) { image.Dispose(); image = null; } } #endregion #region 校验用变量 #region 是否对来源页面进行校验 private bool _IsCheckReferer = false; /// <summary> /// 是否对来源页面进行校验 /// </summary> public bool IsCheckReferer { get { return _IsCheckReferer; } set { _IsCheckReferer = true; } } #endregion #region 来源页面的url /// <summary> /// 来源页面的url /// </summary> private string RefererUrl { get { try { string str = ""; System.Web.UI.Page page = (System.Web.UI.Page)System.Web.HttpContext.Current.Handler; object obj = page.Request.UrlReferrer; str = obj == null ? "" : obj.ToString().Trim().ToLower(); if (str != "") { if (str.IndexOf("?") != -1) { string[] strA = str.Split('?'); str = strA[0]; } } return str; } catch { return ""; } } } #endregion #region 来源页面的域名 /// <summary> /// 来源页面的域名 /// </summary> private string RefererDomain { get { try { string url = RefererUrl; if (url == "") { return ""; } if (url.Length >= 7) { url = url.Substring(7, url.Length - 7); } int index = url.IndexOf("/"); if (index != -1) { url = url.Substring(0, index); } return url; } catch { return ""; } } } #endregion #region 本页面的url /// <summary> /// 本页面的url /// </summary> private string MyUrl { get { try { System.Web.UI.Page page = (System.Web.UI.Page)System.Web.HttpContext.Current.Handler; object obj = page.Request["PATH_INFO"]; string str = obj == null ? "" : obj.ToString().Trim().ToLower(); if (str != "") { if (str.IndexOf("?") != -1) { string[] strA = str.Split('?'); str = strA[0]; } } return "http://" + MyDomain + str; } catch { return ""; } } } #endregion #region 本页面域名 /// <summary> /// 本页面域名 /// </summary> private string MyDomain { get { try { System.Web.UI.Page page = (System.Web.UI.Page)System.Web.HttpContext.Current.Handler; object obj = page.Request["SERVER_NAME"]; return obj == null ? "" : obj.ToString().Trim().ToLower(); } catch { return ""; } } } #endregion #endregion #region 校验验证码是否通过 /// <summary> /// 校验验证码是否通过 /// </summary> /// <param name="sessionKey">SessionKey</param> /// <param name="InputCode">要校验的验证码</param> /// <returns>是否通过</returns> public static bool CheckIsPass(string sessionKey, string InputCode, out string Msg) { if ((InputCode == null) || (InputCode == string.Empty) || (InputCode.Trim() == "")) { Msg = "验证码为空！"; return false; } InputCode = InputCode.Trim(); InputCode = InputCode.ToUpper(); System.Web.UI.Page page = (System.Web.UI.Page)System.Web.HttpContext.Current.Handler; object oSession = page.Session[sessionKey]; if (oSession == null) { Msg = "验证码超时！"; return false; } string sSession = oSession == null ? "" : oSession.ToString(); sSession = sSession.Trim(); if (sSession == "") { Msg = "验证码超时！"; return false; } sSession = sSession.ToUpper(); if (InputCode != sSession) { Msg = "您输入的验证码不正确,请重新输入！"; return false; } Msg = ""; page.Session[sessionKey] = null; //通过后，验证码作废 return true; } #endregion }//ClassEnd /// <summary> /// 生成验证码图片类 /// </summary> internal class VerifyImg { private string ConfigFilePath = HttpContext.Current.Server.MapPath("/SystemConfig/SmsSendLimit.xml"); #region 变量定义 private int MethodCount = 4; private static int iSeed = 0; #endregion #region 生成校验码图片 public Bitmap CreateImageCode(string code) { string Index = "6"; try { CachedXmlData XmlData = new CachedXmlData(this.ConfigFilePath); Index = XmlData.GetXmlNodeValue("//VerifyCode"); if (Index == "6") { return CreateImageCode_6(code); } else { return CreateImageCode_7(code); } } catch { return CreateImageCode_6(code); } ////恢复原来的只有一种算法 //int MethodIndex = GetCurrentMethodIndex(); //switch (MethodIndex) //{ // case 1: // return CreateImageCode_1(code); // case 2: // return CreateImageCode_2(code); // case 3: // return CreateImageCode_3(code); // case 4: // return CreateImageCode_4(code); // default: // return CreateImageCode_4(code); //} } #endregion #region 生成校验码图片方法6 private Bitmap CreateImageCode_6(string Code) { //定义随即数 Random Rand = new Random(); //定义字体颜色 Color[] Colors ={ Color.Black, Color.Red, Color.DarkBlue, Color.Blue, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; //Color[] srColors ={ Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black }; Color UserColor = Colors[Rand.Next(7)]; //定义字体 string[] Fonts ={ "Arial Rounded MT Bold", "Baskerville Old Face", "Imprint MT Shadow", "Century Old Style Std", "Arial", " Arial Black", "Plantagenet Cherokee" };//"Verdana", "Microsoft Sans Serif", "Comic Sans MS","Arial", "宋体" //那前使用的字体 Font UserFont = null; //字的大小 int FontSize = 0; //前一个字体大小 int FrontFontSize = 20; int PointY = 0; Bitmap image = null; Graphics Graph = null; Brush UserBrush = null; try { //定义图象 image = new Bitmap((Code.Length * 20 + 25), 40); //画图 Graph = Graphics.FromImage(image); //清空图象 Graph.Clear(Color.White); //给图象画边框 //Graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1); //把验证码转换成字符数组 char[] CharCode = Code.ToCharArray(); Point UserPoint; #region 用于字体弯曲 //定义图片弯曲的角度 int Srseedangle = 20; float UserAngle; //封状文本 用于 StringFormat srFormat = new StringFormat(StringFormatFlags.NoClip); //设置文本垂直居中 srFormat.Alignment = StringAlignment.Center; //设置文本水平居中 srFormat.LineAlignment = StringAlignment.Center; #endregion #region 生成弯线 Pen UserPen = new Pen(UserColor); //线的大小 Double RandDouble = Rand.NextDouble(); if (RandDouble > 0.5) { RandDouble = RandDouble - 0.5; } UserPen.Width = (float)(2 + RandDouble); int ImgHeight = image.Height; int ImgWidth = image.Width; int RandomPoint = 10; Point[] Points = new Point[RandomPoint]; int RandomLength = ImgWidth / RandomPoint; int TempPointX = 0; for (int i = 0; i < RandomPoint; i++) { TempPointX = Rand.Next((RandomLength * i) + (RandomLength / 5), (RandomLength * (i + 1)) - (RandomLength / 5)); Points[i] = new Point(TempPointX, Rand.Next(12, ImgHeight - 12)); } Graph.DrawBeziers(UserPen, Points); #endregion for (int i = 0, j = CharCode.Length; i < j; i++) { //定义字体 参数分别为字体样式 字体大小 字体字形 FontSize = Rand.Next(26, 28); UserFont = new Font(Fonts[Rand.Next(Fonts.Length)], FontSize, FontStyle.Bold); PointY = 22;// Rand.Next(22, 22); //填充图形 UserBrush = new SolidBrush(UserColor); //定义坐标 UserPoint = new Point(FrontFontSize - 4, PointY); FrontFontSize = FontSize; //定义倾斜角度 UserAngle = Rand.Next(-Srseedangle, Srseedangle); ////倾斜 Graph.TranslateTransform(UserPoint.X, UserPoint.Y, System.Drawing.Drawing2D.MatrixOrder.Append); Graph.RotateTransform(UserAngle); //填充字符 Graph.DrawString(CharCode[i].ToString(), UserFont, UserBrush, 1, 1, srFormat); //Graph.DrawString(CharCode[i].ToString(), UserFont, UserBrush, FrontFontSize, 1); ////回归正常 Graph.RotateTransform(-UserAngle); Graph.TranslateTransform(-1, -UserPoint.Y, System.Drawing.Drawing2D.MatrixOrder.Append); } } catch (Exception ex) { throw ex; } finally { if (Graph != null) { Graph.Dispose(); Graph = null; } if (UserFont != null) { UserFont.Dispose(); UserFont = null; } if (UserBrush != null) { UserBrush.Dispose(); UserBrush = null; } } return image; } #endregion #region 生成校验码图片方法7 private Bitmap CreateImageCode_7(string Code) { //定义随即数 Random Rand = new Random(); //定义字体颜色 Color[] Colors ={ Color.Black, Color.Red, Color.DarkBlue, Color.Blue, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; //Color[] srColors ={ Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black }; Color UserColor = Colors[Rand.Next(7)]; //定义字体 string[] Fonts ={ "Arial Rounded MT Bold", "Baskerville Old Face", "Imprint MT Shadow", "Century Old Style Std", "Arial", " Arial Black", "Plantagenet Cherokee" }; //那前使用的字体 Font UserFont = null; //字的大小 int FontSize = 0; //前一个字体大小 int FrontFontSize = 20; int PointY = 0; Bitmap image = null; Graphics Graph = null; Brush UserBrush = null; try { //定义图象 image = new Bitmap((Code.Length * 20 + 25), 40); //画图 Graph = Graphics.FromImage(image); //清空图象 Graph.Clear(Color.White); ////给图象画边框 //Graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1); //把验证码转换成字符数组 char[] CharCode = Code.ToCharArray(); Point UserPoint; #region 用于字体弯曲 //定义图片弯曲的角度 int Srseedangle = 15; float UserAngle; //封状文本 用于 StringFormat srFormat = new StringFormat(StringFormatFlags.NoClip); //设置文本垂直居中 srFormat.Alignment = StringAlignment.Center; //设置文本水平居中 srFormat.LineAlignment = StringAlignment.Center; #endregion #region 生成弯线 Pen UserPen = new Pen(UserColor); //线的大小 Double RandDouble = Rand.NextDouble(); if (RandDouble > 0.5) { RandDouble = RandDouble - 0.5; } UserPen.Width = (float)(2 + RandDouble); int ImgHeight = image.Height; int ImgWidth = image.Width; int RandomPoint = 10; Point[] Points = new Point[RandomPoint]; int RandomLength = ImgWidth / RandomPoint; int TempPointX = 0; for (int i = 0; i < RandomPoint; i++) { TempPointX = Rand.Next((RandomLength * i), (RandomLength * (i + 1))); Points[i] = new Point(TempPointX, Rand.Next(5, ImgHeight - 5)); } Graph.DrawBeziers(UserPen, Points); #endregion for (int i = 0, j = CharCode.Length; i < j; i++) { //定义字体 参数分别为字体样式 字体大小 字体字形 FontSize = Rand.Next(26, 26); UserFont = new Font(Fonts[Rand.Next(Fonts.Length)], FontSize, FontStyle.Regular); PointY = Rand.Next(20, 24); //填充图形 UserBrush = new SolidBrush(UserColor); //定义坐标 UserPoint = new Point(FrontFontSize - 5, PointY); FrontFontSize = FontSize; //定义倾斜角度 UserAngle = Rand.Next(-Srseedangle, Srseedangle); //倾斜 Graph.TranslateTransform(UserPoint.X, UserPoint.Y); Graph.RotateTransform(UserAngle); //填充字符 Graph.DrawString(CharCode[i].ToString(), UserFont, UserBrush, 1, 1, srFormat); //回归正常 Graph.RotateTransform(-UserAngle); Graph.TranslateTransform(1, -UserPoint.Y); } //产生波形（Add By 51aspx.com） image = TwistImage(image, true, Rand.NextDouble(), Rand.NextDouble()); } catch (Exception ex) { throw ex; } finally { if (Graph != null) { Graph.Dispose(); Graph = null; } if (UserFont != null) { UserFont.Dispose(); UserFont = null; } if (UserBrush != null) { UserBrush.Dispose(); UserBrush = null; } } return image; } #endregion #region 生成校验码图片方法五 #region 获得图片所在目录地址 /// <summary> /// 获得图片所在目录地址 /// </summary> /// <returns></returns> private string GetImagePath() { NameValueCollection appSettings = System.Configuration.ConfigurationSettings.AppSettings; //Server.MapPath( if (appSettings != null) { try { return System.Web.HttpContext.Current.Server.MapPath("/CodeImagePath/"); //return appSettings["CodeImagePath"].Trim(); } catch { return null; } } else { return null; } } #endregion #region 自定义随机码字符串序列 转成字符数组 /// <summary> /// 自定义随机码字符串序列 转成字符数组 /// </summary> /// <returns></returns> private char[] CodeSerialToChar() { string[] StrArr = new VerifyCode(1, 1).CodeSerial.Split(','); char[] CharArr = new char[StrArr.Length]; for (int i = 0; i < StrArr.Length; i++) { CharArr[i] = Convert.ToChar(StrArr[i]); } return CharArr; } #endregion #region 缓存图片 如果改变图片 同时请修改RemoveCache.txt /// <summary> /// 缓存图片 如果改变图片 同时请修改RemoveCache.txt /// </summary> private void CacheImage(string CacheKey, ArrayList Image) { string ImagePath = GetImagePath(); if (ImagePath != null) { HttpRuntime.Cache.Insert(CacheKey, Image, new CacheDependency(ImagePath + "\\RemoveCache.txt")); //HttpRuntime.Cache.Insert(CacheKey, Image, new CacheDependency(GetImagePath+"\\RemoveCache.txt"), DateTime.Now.AddMonths(1), Cache.NoSlidingExpiration, CacheItemPriority.Default, new CacheItemRemovedCallback(onRemove)); } } #endregion #region 获得所有图片 /// <summary> /// 获得所有图片 /// </summary> /// <returns></returns> private ArrayList GetImage() { string VerifyCodeCacheKey = "VerifyCode_Cache_Image_Key"; ArrayList ListImage = HttpRuntime.Cache[VerifyCodeCacheKey] as ArrayList; if (ListImage != null && ListImage.Count > 0) { return ListImage; } else { ListImage = new ArrayList(); char[] CodeArr = CodeSerialToChar(); string ImagePath; for (int i = 0; i < CodeArr.Length; i++) { try { if (CodeArr[i] >= 65 && CodeArr[i] <= 90) { ImagePath = GetImagePath() + "U" + CodeArr[i] + ".gif"; } else { ImagePath = GetImagePath() + CodeArr[i] + ".gif"; } ListImage.Insert(i, new Bitmap(ImagePath)); } catch { } } if (ListImage != null && ListImage.Count > 0) { CacheImage(VerifyCodeCacheKey, ListImage); } return ListImage; } } #endregion #region 生成校验码图片 /// <summary> /// 生成校验码图片 /// </summary> /// <param name="Code"></param> /// <returns></returns> private Bitmap CreateImageCode_5(string Code) { Random Ran = new Random(unchecked((int)DateTime.Now.Ticks)); Bitmap Image = new Bitmap((Code.Length * 20 + 12), 30); Graphics Graph = Graphics.FromImage(Image); Graph.Clear(Color.White); float Str_x; float Str_y; ArrayList ListImage = GetImage(); char[] CodeArr = CodeSerialToChar(); if (ListImage != null && ListImage.Count > 0) { for (int i = 0; i < Code.Length; i++) { for (int j = 0; j < CodeArr.Length; j++) { if (CodeArr[j] == Code[i]) { Str_x = (i * 20 + 6); Str_y = Ran.Next(9) + (float)Ran.NextDouble(); Graph.DrawImage((Image)ListImage[j], Str_x, Str_y); break; } } } } return Image; } #endregion #endregion #region 生成校验码图片方法四 private Bitmap CreateImageCode_4(string code) { Random rnd; rnd = new Random(unchecked((int)DateTime.Now.Ticks)); int fSize = 14; int Padding = 2; int fWidth = fSize + Padding; int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2; int imageHeight = fSize * 2 + Padding * 1 - 5; System.Drawing.Bitmap image = new Bitmap(imageWidth, imageHeight); Graphics g = Graphics.FromImage(image); g.Clear(Color.White); #region 给背景添加随机生成的燥点 Color ChaosColor = Color.LightGray; //燥点的颜色(默认灰色) Pen pen = new Pen(ChaosColor, 0); int Length = code.Length; int c = Length * 30; 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); } #endregion int left = 0, top = 0, top1 = 1, top2 = 1; int n1 = (imageHeight - fSize - Padding * 2); int n2 = n1 / 4; top1 = n2; top2 = n2 * 3; Font f; Brush b; int cindex, findex; string[] Fonts ={ "Arial", "Georgia" }; Color[] Colors ={ Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; for (int i = 0; i < Length; i++) { cindex = rnd.Next(Colors.Length - 1); findex = rnd.Next(Fonts.Length - 1); f = new 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(); image = TwistImage(image, true, 4, 2); return image; } #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> private 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.FillRectangle(new SolidBrush(System.Drawing.Color.AliceBlue), 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 #endregion #region 生成校验码图片方法三 private Bitmap CreateImageCode_3(string code) { int iwidth = (int)(code.Length * 15); Bitmap image = new Bitmap(iwidth, 20); Graphics g = Graphics.FromImage(image); g.Clear(Color.White); Random random = new Random(); //画图片的背景噪音线 for (int i = 0; i < 100; 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.LightGray), x1, y1, x2, y2); } Font font = new Font("Arial", 15, FontStyle.Bold | FontStyle.Italic); System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush( new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.Gray, 1.2f, true); g.DrawString(code, font, brush, 0, 0); //画图片的前景噪音点 for (int i = 0; i < 10; i++) { int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.LightYellow); } //画图片的边框线 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); g.DrawLine(new Pen(GetRandomColor()), 0, 0, iwidth, 20); g.DrawLine(new Pen(GetRandomColor()), 0, 20, iwidth, 0); g.DrawLine(new Pen(GetRandomColor()), iwidth / 2, 0, iwidth / 2, 20); g.DrawLine(new Pen(GetRandomColor()), 0, 10, iwidth, 10); return image; } #endregion #region 生成校验码图片方法二 private Bitmap CreateImageCode_2(string checkCode) { int iwidth = (int)(checkCode.Length * 14); System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 25); Graphics g = Graphics.FromImage(image); g.Clear(Color.AliceBlue); #region 定义颜色 Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple, }; #endregion #region 定义字体 string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" }; #endregion Random rand = new Random(); #region 随机输出噪点 for (int i = 0; i < 10; i++) { int x = rand.Next(image.Width); int y = rand.Next(image.Height); g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1); } #endregion #region 输出不同字体和颜色的验证码字符 for (int i = 0; i < checkCode.Length; i++) { int cindex = rand.Next(7); int findex = rand.Next(5); Font f = new Font(font[findex], 13, System.Drawing.FontStyle.Italic); Brush b = new System.Drawing.SolidBrush(GetRandomColor()); int ii = 2; if ((i + 1) % 2 == 0) { ii = 4; } g.DrawString(checkCode.Substring(i, 1), f, b, 3 + (i * 12), ii); } #endregion image = TwistImage(image, true, -4, -1); g.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1); return image; } #endregion #region 生成校验码图片方法一 private Bitmap CreateImageCode_1(string code) { //定义图片弯曲的角度 int srseedangle = 45; //定义字体颜色 // Color[] srColors ={ Color.Black, Color.Red, Color.DarkBlue, Color.Blue, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; Color[] srColors ={ Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black }; //定义字体 string[] srFonts ={ "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" }; Bitmap image = null; Graphics g = null; Pen srPen = null; Font srFont = null; Brush srBrush = null; try { //定义图象 image = new Bitmap((code.Length * 20 + 12), 30); //画图 g = Graphics.FromImage(image); //清空图象 g.Clear(Color.AliceBlue); //给图象画边框 g.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1); //定义随即数 Random rand = new Random(); //定义画笔 srPen = new Pen(Color.LightGray, 0); ////画噪点 //for (int i = 0; i < 100; i++) //{ // g.DrawRectangle(srPen, rand.Next(1, image.Width - 2), rand.Next(1, image.Height - 2), 1, 1); //} //将字符串转化为字符数组 char[] srchars = code.ToCharArray(); //封状文本 StringFormat srFormat = new StringFormat(StringFormatFlags.NoClip); //设置文本垂直居中 srFormat.Alignment = StringAlignment.Center; //设置文本水平居中 srFormat.LineAlignment = StringAlignment.Center; //循环画出每个字符 int pading = 0; // 间隔 // bool isJoin = false; //是否重叠 int lastSize = 15; int sz = 15; Color lastColor = Color.Blue; Color c = Color.Blue; for (int i = 0, j = srchars.Length; i < j; i++) { //pading = rand.Next(-6, 6); pading = 2; sz = 18; ////定义字体 参数分别为字体样式 字体大小 字体字形 //if (i == j - 2 && !isJoin) //倒数第二个没有重叠的话，则设置为大字体，保证重叠 //{ // sz = 20; //} //else //{ // sz = rand.Next(15, 20); //} c = srColors[rand.Next(7)]; //定义字体 参数分别为字体样式 字体大小 字体字形 srFont = new Font(srFonts[rand.Next(5)], sz, FontStyle.Regular); /////如果上一个字是14号,那么下一字向左入侵保证重叠 ////对大字号重叠的可视性要比小字号强. ////重叠时最好将当前字符的颜色设为上一字符颜色 //if (lastSize == 20) //{ // c = lastColor; // isJoin = true; // pading = -5; //} //填充图形 srBrush = new SolidBrush(c); lastColor = c; lastSize = sz; //定义坐标 Point srPoint = new Point(16 + pading, 16); //定义倾斜角度 float srangle = rand.Next(-srseedangle, srseedangle); //倾斜 g.TranslateTransform(srPoint.X, srPoint.Y); g.RotateTransform(srangle); //填充字符 g.DrawString(srchars[i].ToString(), srFont, srBrush, 1, 1, srFormat); //回归正常 g.RotateTransform(-srangle); g.TranslateTransform(2, -srPoint.Y); } } catch (Exception ex) { throw ex; } finally { if (g != null) { g.Dispose(); g = null; } if (srPen != null) { srPen.Dispose(); srPen = null; } if (srFont != null) { srFont.Dispose(); srFont = null; } if (srBrush != null) { srBrush.Dispose(); srBrush = null; } } return image; } #endregion #region 获取当前方法序号 /// <summary> /// 获取当前方法序号 /// </summary> /// <returns></returns> private int GetCurrentMethodIndex() { if (iSeed == 999999) { iSeed = 0; } else { iSeed = iSeed + 1; } int randValue = -1; int curSeed = unchecked((int)DateTime.Now.Ticks + iSeed); //System.Web.HttpContext.Current.Response.Write(iSeed.ToString() + " " + "种子：" + curSeed.ToString() + "<br>"); Random rand = new Random(curSeed); randValue = rand.Next(1, MethodCount + 1); return randValue; } #endregion #region 生成随机颜色 /// <summary> /// 生成随机颜色 /// </summary> /// <returns></returns> private Color GetRandomColor() { Random RandomNum_First = new Random((int)DateTime.Now.Ticks); System.Threading.Thread.Sleep(RandomNum_First.Next(50)); Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks); // 为了在白色背景上显示，尽量生成深色 int int_Red = RandomNum_First.Next(256); int int_Green = RandomNum_Sencond.Next(256); int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green; int_Blue = (int_Blue > 255) ? 255 : int_Blue; return Color.FromArgb(int_Red, int_Green, int_Blue); } #endregion } ///// <summary> ///// 获得XML文件并缓存XML文件 ///// </summary> //public class CachedXmlData //{ // /// <summary> // /// 用于 文件路径 和缓存Key // /// </summary> // private string ConfigFilePath = ""; // public CachedXmlData(string FilePath) // { // this.ConfigFilePath = FilePath; // } // #region 获得XmlDocument 缓存以依赖FilePath // /// <summary> // /// 获得XmlDocument 缓存以依赖FilePath中的文件 // /// </summary> // /// <param name="FilePath">如果为null 用 /SystemConfig/SmsSendLimit.xml</param> // /// <returns></returns> // private XmlDocument GetXmlDoc() // { // XmlDocument XmlDoc = HttpRuntime.Cache[this.ConfigFilePath] as XmlDocument; // if (XmlDoc != null) // { // return XmlDoc; // } // else // { // XmlDoc = new XmlDocument(); // try // { // if (File.Exists(ConfigFilePath)) // { // XmlDoc.Load(ConfigFilePath); // HttpRuntime.Cache.Insert(this.ConfigFilePath, XmlDoc, new CacheDependency(ConfigFilePath)); // } // } // catch // { // if (XmlDoc != null) // { // XmlDoc = null; // } // } // return XmlDoc; // } // } // #endregion // #region 获得Xml指定的路径的值 // /// <summary> // /// 获得Xml指定的路径的值 // /// </summary> // /// <param name="XPath">Xml Path</param> // /// <returns>string 或 null</returns> // public string GetXmlNodeValue(string XPath) // { // string ReturnValue = null; // XmlDocument XmlDoc = GetXmlDoc(); // if (XmlDoc != null) // { // try // { // XmlNode Node = XmlDoc.SelectSingleNode(XPath); // if (Node != null) // { // ReturnValue = Node.InnerText; // } // } // catch (Exception) // { // ReturnValue = null; // } // } // return ReturnValue; // } // #endregion // #region 获得Xml指定的路径的XmlNodeXmlNodeList // /// <summary> // /// 获得Xml指定的路径的XmlNode // /// </summary> // /// <param name="XPath">Xml Path</param> // /// <returns>XmlNode 或 null</returns> // public XmlNodeList GetXmlNode(string XPath) // { // XmlNodeList ReturnValue = null; // XmlDocument XmlDoc = GetXmlDoc(); // if (XmlDoc != null) // { // try // { // ReturnValue = XmlDoc.SelectNodes(XPath); // } // catch // { // ReturnValue = null; // } // } // return ReturnValue; // } // #endregion //} }
所有问题都会有一定程度的抽象和假设
