闲来无事，就写了一个汉字验证码，不常见吧，废话少说直接上代码：
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1 protected void Page_Load(object sender, EventArgs e) 2 { 3 int length = 4; 4 string strkey = getString(length); 5 byte[] data = CheckCodeService(length, strkey); 6 Response.OutputStream.Write(data, 0, data.Length); 7 } 8 //产生的汉字验证码 9 private object[] CreateString(int strLength) { 10 //定义一个数组存储汉字编码的组成元素 11 string[] str = new string[16] {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f" }; 12 Random ran = new Random(); 13 object[] bytes = new object[strLength]; 14 for (int i = 0; i < strLength; i++) { 15 //获取区位码第一位 16 int ran1 = ran.Next(11, 14); 17 string str1 = str[ran1].Trim(); 18 //获取第二位并防止重复 19 ran = new Random(ran1*unchecked((int)DateTime.Now.Ticks)+i); 20 int ran2; 21 if (ran1 == 13) 22 { 23 ran2 = ran.Next(0, 7); 24 } 25 else 26 { 27 ran2 = ran.Next(0, 16); 28 } 29 string str2 = str[ran2].Trim(); 30 //获取第三位区位码 31 ran = new Random(ran2*unchecked((int)DateTime.Now.Ticks)+i); 32 int ran3 = ran.Next(10,16); 33 string str3 = str[ran3].Trim(); 34 //获取第四位区位码 35 ran = new Random(ran3 * unchecked((int)DateTime.Now.Ticks)+i); 36 int ran4; 37 if (ran3 == 10) 38 { 39 ran4 = ran.Next(1, 16); 40 } 41 else if (ran3 == 15) 42 { 43 ran4 = ran.Next(0, 15); 44 } 45 else 46 47 { 48 ran4 = ran.Next(0,16); 49 } 50 string str4 = str[ran4].Trim(); 51 //定义字节变量存储产生的随机汉字区位码 52 byte byte1 = Convert.ToByte(str1+str2,16); 53 byte byte2 = Convert.ToByte(str3+str4,16); 54 byte[] stradd = new byte[] {byte1,byte2}; 55 //将产生的汉字放入数组 56 bytes.SetValue(stradd, i); 57 58 59 } 60 return bytes; 61 62 63 } 64 65 //获取验证码 66 private string getString(int length) { 67 Encoding gb = Encoding.GetEncoding("gb2312"); 68 object[] bytes = CreateString(length); 69 //根据汉字字节解码出中文汉字 70 string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0],typeof(byte[]))); 71 string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[]))); 72 string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[]))); 73 string str4 = gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[]))); 74 string str = str1 + str2 + str3 + str4; 75 Response.Cookies.Add(new HttpCookie("CheckCode",str)); 76 return str; 77 } 78 79 //生成图片验证码 80 protected byte[] CheckCodeService(int nLen, string strKey) 81 { 82 int nBmpWidth = 13 * nLen + 50; 83 int nBmpHeight = 25; 84 System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(nBmpWidth, nBmpHeight); 85 //生成随机背景颜色 86 int nRed; 87 int nGreen; 88 int nBlue; 89 //生成三原色 90 System.Random rd = new Random((int)System.DateTime.Now.Ticks); 91 nRed = rd.Next(255) % 128 + 128; 92 nGreen = rd.Next(255) % 128 + 128; 93 nBlue = rd.Next(255) % 128 + 128; 94 //填充背景 95 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(bmp); 96 graph.FillRectangle(new System.Drawing.SolidBrush(System.Drawing.Color.AliceBlue), 0, 0, nBmpWidth, nBmpHeight); 97 //绘制干扰线，采用比背景深一些的颜色 98 int nLines = 3; 99 System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Color.FromArgb(nRed - 17, nGreen - 17, nBlue - 17), 2); 100 for (int a = 0; a < nLines; a++) 101 { 102 int x1 = rd.Next(nBmpWidth); 103 int x2 = rd.Next(nBmpHeight); 104 int y1 = rd.Next(nBmpWidth); 105 int y2 = rd.Next(nBmpHeight); 106 graph.DrawLine(pen, x1, y1, x2, y2); 107 108 } 109 //画图片的前景噪音点 110 for (int i = 0; i < 100; i++) 111 { 112 int x = rd.Next(bmp.Width); 113 int y = rd.Next(bmp.Height); 114 bmp.SetPixel(x, y, System.Drawing.Color.FromArgb(rd.Next())); 115 116 } 117 //确定字体 118 System.Drawing.Font font = new System.Drawing.Font("Courier New", 14 + rd.Next() % 4, System.Drawing.FontStyle.Bold); 119 System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height), System.Drawing.Color.Blue, System.Drawing.Color.DarkRed, 1.2f, true); 120 graph.DrawString(strKey, font, brush, 2, 2); 121 //输出字节流 122 System.IO.MemoryStream stream = new System.IO.MemoryStream(); 123 bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg); 124 bmp.Dispose(); 125 graph.Dispose(); 126 byte[] byteReturn = stream.ToArray(); 127 stream.Close(); 128 return byteReturn; 129 }