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C#生成漂亮验证码完整代码类
时间:2022-06-29 01:26:30 编辑:袖梨 来源:一聚教程网
代码如下 | 复制代码 |
using System; using System.Web; using System.Drawing; using System.Security.Cryptography; namespace DotNet.Utilities { /// /// 验证码类 /// public class Rand { #region 生成随机数字 /// /// 生成随机数字 /// ///生成长度 public static string Number( int Length) { return Number(Length, false ); } /// /// 生成随机数字 /// ///生成长度 ///是否要在生成前将当前线程阻止以避免重复 public static string Number( int Length, bool Sleep) { if (Sleep) System.Threading.Thread.Sleep(3); string result = "" ; System.Random random = new Random(); for ( int i = 0; i < Length; i++) { result += random.Next(10).ToString(); } return result; } #endregion #region 生成随机字母与数字 /// /// 生成随机字母与数字 /// ///生成长度 public static string Str( int Length) { return Str(Length, false ); } /// /// 生成随机字母与数字 /// ///生成长度 ///是否要在生成前将当前线程阻止以避免重复 public static string Str( int Length, bool Sleep) { if (Sleep) System.Threading.Thread.Sleep(3); char [] Pattern = new char [] { Ɔ' , Ƈ' , ƈ' , Ɖ' , Ɗ' , Ƌ' , ƌ' , ƍ' , Ǝ' , Ə' , '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 result = "" ; int n = Pattern.Length; System.Random random = new Random(~ unchecked (( int )DateTime.Now.Ticks)); for ( int i = 0; i < Length; i++) { int rnd = random.Next(0, n); result += Pattern[rnd]; } return result; } #endregion #region 生成随机纯字母随机数 /// /// 生成随机纯字母随机数 /// ///生成长度 public static string Str_char( int Length) { return Str_char(Length, false ); } /// /// 生成随机纯字母随机数 /// ///生成长度 ///是否要在生成前将当前线程阻止以避免重复 public static string Str_char( int Length, bool Sleep) { if (Sleep) System.Threading.Thread.Sleep(3); char [] Pattern = new char [] { '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 result = "" ; int n = Pattern.Length; System.Random random = new Random(~ unchecked (( int )DateTime.Now.Ticks)); for ( int i = 0; i < Length; i++) { int rnd = random.Next(0, n); result += Pattern[rnd]; } return result; } #endregion } /// /// 验证图片类 /// public class YZMHelper { #region 私有字段 private string text; private Bitmap image; private int letterCount = 4; //验证码位数 private int letterWidth = 16; //单个字体的宽度范围 private int letterHeight = 20; //单个字体的高度范围 private static byte [] randb = new byte [4]; private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider(); private Font[] fonts = { new Font( new FontFamily( "Times New Roman" ),10 +Next(1),System.Drawing.FontStyle.Regular), new Font( new FontFamily( "Georgia" ), 10 + Next(1),System.Drawing.FontStyle.Regular), new Font( new FontFamily( "Arial" ), 10 + Next(1),System.Drawing.FontStyle.Regular), new Font( new FontFamily( "Comic Sans MS" ), 10 + Next(1),System.Drawing.FontStyle.Regular) }; #endregion #region 公有属性 /// /// 验证码 /// public string Text { get { return this .text; } } /// /// 验证码图片 /// public Bitmap Image { get { return this .image; } } #endregion #region 构造函数 public YZMHelper() { HttpContext.Current.Response.Expires = 0; HttpContext.Current.Response.Buffer = true ; HttpContext.Current.Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1); HttpContext.Current.Response.AddHeader( "pragma" , "no-cache" ); HttpContext.Current.Response.CacheControl = "no-cache" ; this .text = Rand.Number(4); CreateImage(); } #endregion #region 私有方法 /// /// 获得下一个随机数 /// ///最大值 private static int Next( int max) { rand.GetBytes(randb); int value = BitConverter.ToInt32(randb, 0); value = value % (max + 1); if (value < 0) value = -value; return value; } /// /// 获得下一个随机数 /// ///最小值 ///最大值 private static int Next( int min, int max) { int value = Next(max - min) + min; return value; } #endregion #region 公共方法 /// /// 绘制验证码 /// public void CreateImage() { int int_ImageWidth = this .text.Length * letterWidth; Bitmap image = new Bitmap(int_ImageWidth, letterHeight); Graphics g = Graphics.FromImage(image); g.Clear(Color.White); for ( int i = 0; i < 2; i++) { int x1 = Next(image.Width - 1); int x2 = Next(image.Width - 1); int y1 = Next(image.Height - 1); int y2 = Next(image.Height - 1); g.DrawLine( new Pen(Color.Silver), x1, y1, x2, y2); } int _x = -12, _y = 0; for ( int int_index = 0; int_index < this .text.Length; int_index++) { _x += Next(12, 16); _y = Next(-2, 2); string str_char = this .text.Substring(int_index, 1); str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper(); Brush newBrush = new SolidBrush(GetRandomColor()); Point thePos = new Point(_x, _y); g.DrawString(str_char, fonts[Next(fonts.Length - 1)], newBrush, thePos); } for ( int i = 0; i < 10; i++) { int x = Next(image.Width - 1); int y = Next(image.Height - 1); image.SetPixel(x, y, Color.FromArgb(Next(0, 255), Next(0, 255), Next(0, 255))); } image = TwistImage(image, true , Next(1, 3), Next(4, 6)); g.DrawRectangle( new Pen(Color.LightGray, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1)); this .image = image; } /// /// 字体随机颜色 /// public 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); int int_Red = RandomNum_First.Next(180); int int_Green = RandomNum_Sencond.Next(180); int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green; int_Blue = (int_Blue > 255) ? 255 : int_Blue; return Color.FromArgb(int_Red, int_Green, int_Blue); } /// /// 正弦曲线Wave扭曲图片 /// ///图片路径 ///如果扭曲则选择为True ///波形的幅度倍数,越大扭曲的程度越高,一般为3 ///波形的起始相位,取值区间[0-2*PI) public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase) { double PI = 6.283185307179586476925286766559; Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height); 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 ? (PI * ( double )j) / dBaseAxisLen : (PI * ( double )i) / dBaseAxisLen; dx += dPhase; double dy = Math.Sin(dx); int nOldX = 0, nOldY = 0; nOldX = bXDir ? i + ( int )(dy * dMultValue) : i; nOldY = bXDir ? j : j + ( int )(dy * dMultValue); Color color = srcBmp.GetPixel(i, j); if (nOldX >= 0 && nOldX < destBmp.Width && nOldY >= 0 && nOldY < destBmp.Height) { destBmp.SetPixel(nOldX, nOldY, color); } } } srcBmp.Dispose(); return destBmp; } #endregion } |
}
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