验证码帮助类-白红宇

验证码帮助类
阅读量：5092 次
发布时间：2019-06-13
本文共 9970 字，大约阅读时间需要 33 分钟。
1 using System;  2 using System.Web;  3 using System.Drawing;  4 using System.Security.Cryptography;  5   6 namespace DotNet.Utilities  7 {  8     ///   9     /// 验证码类 10     /// 
 11     public class Rand 12     { 13         #region 生成随机数字 14         ///  15         /// 生成随机数字 16         /// 
 17         /// 生成长度 18         public static string Number(int Length) 19         { 20             return Number(Length, false); 21         } 22  23         ///  24         /// 生成随机数字 25         /// 
 26         /// 生成长度 27         /// 是否要在生成前将当前线程阻止以避免重复 28         public static string Number(int Length, bool Sleep) 29         { 30             if (Sleep) System.Threading.Thread.Sleep(3); 31             string result = ""; 32             System.Random random = new Random(); 33             for (int i = 0; i < Length; i++) 34             { 35                 result += random.Next(10).ToString(); 36             } 37             return result; 38         } 39         #endregion 40  41         #region 生成随机字母与数字 42         ///  43         /// 生成随机字母与数字 44         /// 
 45         /// 生成长度 46         public static string Str(int Length) 47         { 48             return Str(Length, false); 49         } 50  51         ///  52         /// 生成随机字母与数字 53         /// 
 54         /// 生成长度 55         /// 是否要在生成前将当前线程阻止以避免重复 56         public static string Str(int Length, bool Sleep) 57         { 58             if (Sleep) System.Threading.Thread.Sleep(3); 59             char[] Pattern = new char[] { '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' }; 60             string result = ""; 61             int n = Pattern.Length; 62             System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks)); 63             for (int i = 0; i < Length; i++) 64             { 65                 int rnd = random.Next(0, n); 66                 result += Pattern[rnd]; 67             } 68             return result; 69         } 70         #endregion 71  72         #region 生成随机纯字母随机数 73         ///  74         /// 生成随机纯字母随机数 75         /// 
 76         /// 生成长度 77         public static string Str_char(int Length) 78         { 79             return Str_char(Length, false); 80         } 81  82         ///  83         /// 生成随机纯字母随机数 84         /// 
 85         /// 生成长度 86         /// 是否要在生成前将当前线程阻止以避免重复 87         public static string Str_char(int Length, bool Sleep) 88         { 89             if (Sleep) System.Threading.Thread.Sleep(3); 90             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' }; 91             string result = ""; 92             int n = Pattern.Length; 93             System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks)); 94             for (int i = 0; i < Length; i++) 95             { 96                 int rnd = random.Next(0, n); 97                 result += Pattern[rnd]; 98             } 99             return result;100         }101         #endregion102     }103 104     /// 105     /// 验证图片类106     /// 
107     public class YZMHelper108     {109         #region 私有字段110         private string text;111         private Bitmap image;112         private int letterCount = 4;   //验证码位数113         private int letterWidth = 16;  //单个字体的宽度范围114         private int letterHeight = 20; //单个字体的高度范围115         private static byte[] randb = new byte[4];116         private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();117         private Font[] fonts = 118     {119        new Font(new FontFamily("Times New Roman"),10 +Next(1),System.Drawing.FontStyle.Regular),120        new Font(new FontFamily("Georgia"), 10 + Next(1),System.Drawing.FontStyle.Regular),121        new Font(new FontFamily("Arial"), 10 + Next(1),System.Drawing.FontStyle.Regular),122        new Font(new FontFamily("Comic Sans MS"), 10 + Next(1),System.Drawing.FontStyle.Regular)123     };124         #endregion125 126         #region 公有属性127         /// 128         /// 验证码129         /// 
130         public string Text131         {132             get { return this.text; }133         }134 135         /// 136         /// 验证码图片137         /// 
138         public Bitmap Image139         {140             get { return this.image; }141         }142         #endregion143 144         #region 构造函数145         public YZMHelper()146         {147             HttpContext.Current.Response.Expires = 0;148             HttpContext.Current.Response.Buffer = true;149             HttpContext.Current.Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1);150             HttpContext.Current.Response.AddHeader("pragma", "no-cache");151             HttpContext.Current.Response.CacheControl = "no-cache";152             this.text = Rand.Number(4);153             CreateImage();154         }155         #endregion156 157         #region 私有方法158         /// 159         /// 获得下一个随机数160         /// 
161         /// 最大值162         private static int Next(int max)163         {164             rand.GetBytes(randb);165             int value = BitConverter.ToInt32(randb, 0);166             value = value % (max + 1);167             if (value < 0) value = -value;168             return value;169         }170 171         /// 172         /// 获得下一个随机数173         /// 
174         /// 最小值175         /// 最大值176         private static int Next(int min, int max)177         {178             int value = Next(max - min) + min;179             return value;180         }181         #endregion182 183         #region 公共方法184         /// 185         /// 绘制验证码186         /// 
187         public void CreateImage()188         {189             int int_ImageWidth = this.text.Length * letterWidth;190             Bitmap image = new Bitmap(int_ImageWidth, letterHeight);191             Graphics g = Graphics.FromImage(image);192             g.Clear(Color.White);193             for (int i = 0; i < 2; i++)194             {195                 int x1 = Next(image.Width - 1);196                 int x2 = Next(image.Width - 1);197                 int y1 = Next(image.Height - 1);198                 int y2 = Next(image.Height - 1);199                 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);200             }201             int _x = -12, _y = 0;202             for (int int_index = 0; int_index < this.text.Length; int_index++)203             {204                 _x += Next(12, 16);205                 _y = Next(-2, 2);206                 string str_char = this.text.Substring(int_index, 1);207                 str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper();208                 Brush newBrush = new SolidBrush(GetRandomColor());209                 Point thePos = new Point(_x, _y);210                 g.DrawString(str_char, fonts[Next(fonts.Length - 1)], newBrush, thePos);211             }212             for (int i = 0; i < 10; i++)213             {214                 int x = Next(image.Width - 1);215                 int y = Next(image.Height - 1);216                 image.SetPixel(x, y, Color.FromArgb(Next(0, 255), Next(0, 255), Next(0, 255)));217             }218             image = TwistImage(image, true, Next(1, 3), Next(4, 6));219             g.DrawRectangle(new Pen(Color.LightGray, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1));220             this.image = image;221         }222 223         /// 224         /// 字体随机颜色225         /// 
226         public Color GetRandomColor()227         {228             Random RandomNum_First = new Random((int)DateTime.Now.Ticks);229             System.Threading.Thread.Sleep(RandomNum_First.Next(50));230             Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);231             int int_Red = RandomNum_First.Next(180);232             int int_Green = RandomNum_Sencond.Next(180);233             int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green;234             int_Blue = (int_Blue > 255) ? 255 : int_Blue;235             return Color.FromArgb(int_Red, int_Green, int_Blue);236         }237 238         /// 239         /// 正弦曲线Wave扭曲图片240         /// 
241         /// 图片路径242         /// 如果扭曲则选择为True243         /// 波形的幅度倍数，越大扭曲的程度越高,一般为3244         /// 波形的起始相位,取值区间[0-2*PI)245         public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)246         {247             double PI = 6.283185307179586476925286766559;248             Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);249             Graphics graph = Graphics.FromImage(destBmp);250             graph.FillRectangle(new SolidBrush(Color.White), 0, 0, destBmp.Width, destBmp.Height);251             graph.Dispose();252             double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;253             for (int i = 0; i < destBmp.Width; i++)254             {255                 for (int j = 0; j < destBmp.Height; j++)256                 {257                     double dx = 0;258                     dx = bXDir ? (PI * (double)j) / dBaseAxisLen : (PI * (double)i) / dBaseAxisLen;259                     dx += dPhase;260                     double dy = Math.Sin(dx);261                     int nOldX = 0, nOldY = 0;262                     nOldX = bXDir ? i + (int)(dy * dMultValue) : i;263                     nOldY = bXDir ? j : j + (int)(dy * dMultValue);264 265                     Color color = srcBmp.GetPixel(i, j);266                     if (nOldX >= 0 && nOldX < destBmp.Width267                      && nOldY >= 0 && nOldY < destBmp.Height)268                     {269                         destBmp.SetPixel(nOldX, nOldY, color);270                     }271                 }272             }273             srcBmp.Dispose();274             return destBmp;275         }276         #endregion277     }278 }