.net處理程序生成隨機6位圖片驗證碼,大家參考使用吧
代碼如下: /// <summary> /// PicHandler1 的摘要說明 /// </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 = "宋體"; 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(); //如果沒有實現IRequiresSessionState，則這裡會出錯，也無法生成圖片 context.Response.End(); } //驗證碼生成 protected string DisCheckNo() { string hash = HashCode.GetNext(); string CheckNo = string.Empty; Random rd = new Random(DateTime.Now.Millisecond); for (int i = 0; i < 6; 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; } } } 調用的類 代碼如下: using System; using System.Drawing; using System.Text; /// <summary> /// VryImgGen 的摘要說明 /// </summary> public class VryImgGen { public static string ChineseChars = String.Empty; /// <summary> /// 英文與數字串 /// </summary> protected static readonly string EnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; public VryImgGen() { rnd = new Random(unchecked((int)DateTime.Now.Ticks)); } /// <summary> /// 全局隨機數生成器 /// </summary> private Random rnd; int length = 5; /// <summary> /// 驗證碼長度(默認6個驗證碼的長度) /// </summary> public int Length { get { return length; } set { length = value; } } int fontSize = 20; /// <summary> /// 驗證碼字體大小(為了顯示扭曲效果，默認30像素，可以自行修改) /// </summary> public int FontSize { get { return fontSize; } set { fontSize = value; } } int padding = 4; /// <summary> /// 邊框補(默認4像素) /// </summary> public int Padding { get { return padding; } set { padding = value; } } bool chaos = true; /// <summary> /// 是否輸出燥點(默認輸出) /// </summary> public bool Chaos { get { return chaos; } set { chaos = value; } } Color chaosColor = Color.LightGray; /// <summary> /// 輸出燥點的顏色(默認灰色) /// </summary> public Color ChaosColor { get { return chaosColor; } set { chaosColor = value; } } int chaosWight = 1; /// <summary> /// 輸出燥點的濃度 /// </summary> public int ChaosWight { get { return chaosWight; } set { chaosWight = value; } } Color backgroundColor = Color.White; /// <summary> /// 自定義背景色(默認白色) /// </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> /// 自定義隨機顏色數組 /// </summary> public Color[] Colors { get { return colors; } set { colors = value; } } string[] fonts = { "Arial", "Georgia" }; /// <summary> /// 自定義字體數組 /// </summary> public string[] Fonts { get { return fonts; } set { fonts = value; } } #region 產生波形濾鏡效果 private const double PI = 3.1415926535897932384626433832795; private const double PI2 = 6.283185307179586476925286766559; /// <summary> /// 正弦曲線Wave扭曲圖片（Edit By 51aspx.com） /// </summary> /// <param name="srcBmp">圖片路徑</param> /// <param name="bXDir">如果扭曲則選擇為True</param> /// <param name="nMultValue">波形的幅度倍數，越大扭曲的程度越高，一般為3</param> /// <param name="dPhase">波形的起始相位，取值區間[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); // 將位圖背景填充為白色 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); // 取得當前點的顏色 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 /// <summary> /// 生成校驗碼圖片 /// </summary> /// <param name="code">驗證碼</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); //給背景添加隨機生成的燥點 if (this.Chaos) { Pen pen = new Pen(ChaosColor, 0); int c = ChaosWight * 10; 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); } } 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; //隨機字體和顏色的驗證碼字符 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); } //畫一個邊框 邊框顏色為Color.Gainsboro g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1); g.Dispose(); //產生波形（Add By 51aspx.com） image = TwistImage(image, true, 8, 4); return image; } /// <summary> /// 生成隨機字符碼 /// </summary> /// <param name="codeLen">字符串長度</param> /// <param name="zhCharsCount">中文字符數</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> /// 生成默認長度5的隨機字符碼 /// </summary> /// <returns></returns> public string CreateVerifyCode() { return CreateVerifyCode(Length, 0); } /// <summary> /// 生成英文或數字字符 /// </summary> /// <returns></returns> protected char CreateEnOrNumChar() { return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)]; } /// <summary> /// 生成漢字字符 /// </summary> /// <returns></returns> protected char CreateZhChar() { //若提供了漢字集，查詢漢字集選取漢字 if (ChineseChars.Length > 0) { return ChineseChars[rnd.Next(0, ChineseChars.Length)]; } //若沒有提供漢字集，則根據《GB2312簡體中文編碼表》編碼規則構造漢字 else { byte[] bytes = new byte[2]; //第一個字節值在0xb0, 0xf7之間 bytes[0] = (byte)rnd.Next(0xb0, 0xf8); //第二個字節值在0xa1, 0xfe之間 bytes[1] = (byte)rnd.Next(0xa1, 0xff); //根據漢字編碼的字節數組解碼出中文漢字 string str1 = Encoding.GetEncoding("gb2312").GetString(bytes); return str1[0]; } } }
