验证码类V1

  1 /// <summary>
  2     /// 验证码类
  3     /// </summary>
  4     public class ValidateCode
  5     {
  6         /// <summary>
  7         /// 验证码的最大长度
  8         /// </summary>
  9         public int MaxLength { get { return 10; } }
 10
 11         /// <summary>
 12         /// 验证码的最小长度
 13         /// </summary>
 14         public int MinLength { get { return 1; } }
 15
 16         /// <summary>
 17         /// 生成指定长度的验证码字符串
 18         /// </summary>
 19         /// <param name="length"></param>
 20         /// <returns></returns>
 21         public string CreateValidateCodeStr(int length)
 22         {
 23             //生成起始序列值
 24             int seed = unchecked((int)DateTime.Now.Ticks);
 25             Random seedRandom = new Random(seed);
 26             int beginSeed = seedRandom.Next(0, Int32.MaxValue - length * 10000);
 27             int[] seeds=new int[length];
 28             for (int i = 0; i < length; i++)
 29             {
 30                 beginSeed += 10000;
 31                 seeds[i] = beginSeed;
 32             }
 33
 34             //生成随机数
 35             int[] randMembers = new int[length];
 36             for (int i = 0; i < length; i++)
 37             {
 38                 Random rand = new Random(seeds[i]);
 39                 int p = 1 * (int)Math.Pow(10, length);
 40                 randMembers[i] = rand.Next(p, Int32.MaxValue);
 41             }
 42
 43             //抽取随机数字
 44             int[] validateNums=new int[length];
 45             for (int i = 0; i < length; i++)
 46             {
 47                 string numStr = randMembers[i].ToString();
 48                 int numLength = numStr.Length;
 49                 Random rand = new Random();
 50                 int numPosition = rand.Next(0, numLength - 1);
 51                 validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
 52             }
 53
 54             //生成验证码
 55             string validateCodeStr = "";
 56             for (int i = 0; i < length; i++)
 57             {
 58                 validateCodeStr += validateNums[i].ToString();
 59             }
 60
 61             return validateCodeStr;
 62         }
 63
 64         /// <summary>
 65         /// 创建验证码的图片
 66         /// </summary>
 67         /// <param name="validateCodeStr"></param>
 68         /// <returns></returns>
 69         public byte[] CreateValidateImg(string validateCodeStr)
 70         {
 71             Bitmap bitmap = new Bitmap((int)Math.Ceiling(validateCodeStr.Length * 12.0), 22);
 72             Graphics g = Graphics.FromImage(bitmap);
 73             try
 74             {
 75                 //清空图片的背景色
 76                 g.Clear(Color.White);
 77                 //实例化随机生成器
 78                 Random rand = new Random();
 79                 //画图片的干扰线
 80                 for (int i = 0; i < 25; i++)
 81                 {
 82                     int x1 = rand.Next(bitmap.Width);
 83                     int y1 = rand.Next(bitmap.Height);
 84                     int x2 = rand.Next(bitmap.Width);
 85                     int y2 = rand.Next(bitmap.Height);
 86                     g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
 87                 }
 88                 //画字符串
 89                 Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
 90                 LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, bitmap.Width, bitmap.Height), Color.Blue, Color.DarkRed, 1.2f, true);
 91                 g.DrawString(validateCodeStr, font, brush, 3, 2);
 92                 //画图片的前景干扰点
 93                 for (int i = 0; i < 100; i++)
 94                 {
 95                     int x = rand.Next(bitmap.Width);
 96                     int y = rand.Next(bitmap.Height);
 97                     bitmap.SetPixel(x, y, Color.FromArgb(rand.Next()));
 98                 }
 99                 //画图片的边框线
100                 g.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1);
101                 //保存图片数据
102                 MemoryStream stream = new MemoryStream();
103                 bitmap.Save(stream, ImageFormat.Jpeg);
104                 //输出图片流
105                 return stream.ToArray();
106             }
107             finally
108             {
109                 g.Dispose();
110                 bitmap.Dispose();
111             }
112         }
113
114         /// <summary>
115         /// 得到验证码图片的长度
116         /// </summary>
117         /// <param name="validateNumLength">验证码的长度</param>
118         /// <returns></returns>
119         public static int GetImgWidth(int validateNumLength)
120         {
121             return (int)(validateNumLength * 12.0);
122         }
123
124         /// <summary>
125         /// 得到验证码图片的高度
126         /// </summary>
127         /// <returns></returns>
128         public static double GetImgHeight()
129         {
130             return 22.5;
131         }
132     }

验证码类V1