验证码生产类

1 using System; 2 using System.Data; 3 using System.Configuration; 4 5 using System.Web; 6 using System.Web.Security; 7 using System.Web.UI; 8 using System.Web.UI.HtmlControls; 9 using System.Web.UI.WebControls; 10 using System.Web.UI.WebControls.WebParts; 11 12 using System.Drawing; 13 using System.IO; 14 using System.Drawing.Imaging; 15 16 /// <summary> 17 /// Summary description for validatedCode 18 /// </summary> 19 public class ValidatedCode 20 { 21 #region 验证码长度(默认4个验证码的长度) 22 int length = 4; 23 public int Length 24 { 25 get { return length; } 26 set { length = value; } 27 } 28 #endregion 29 30 #region 验证码字体大小(为了显示扭曲效果,默认40像素,可以自行修改) 31 int fontSize = 40; 32 public int FontSize 33 { 34 get { return fontSize; } 35 set { fontSize = value; } 36 } 37 #endregion 38 39 #region 边框补(默认1像素) 40 int padding = 2; 41 public int Padding 42 { 43 get { return padding; } 44 set { padding = value; } 45 } 46 #endregion 47 48 #region 是否输出燥点(默认不输出) 49 bool chaos = true; 50 public bool Chaos 51 { 52 get { return chaos; } 53 set { chaos = value; } 54 } 55 #endregion 56 57 #region 输出燥点的颜色(默认灰色) 58 Color chaosColor = Color.LightGray; 59 public Color ChaosColor 60 { 61 get { return chaosColor; } 62 set { chaosColor = value; } 63 } 64 #endregion 65 66 #region 自定义背景色(默认白色) 67 Color backgroundColor = Color.White; 68 public Color BackgroundColor 69 { 70 get { return backgroundColor; } 71 set { backgroundColor = value; } 72 } 73 #endregion 74 75 #region 自定义随机颜色数组 76 Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; 77 public Color[] Colors 78 { 79 get { return colors; } 80 set { colors = value; } 81 } 82 #endregion 83 84 #region 自定义字体数组 85 string[] fonts = { "Arial", "Georgia" }; 86 public string[] Fonts 87 { 88 get { return fonts; } 89 set { fonts = value; } 90 } 91 #endregion 92 93 #region 自定义随机码字符串序列(使用逗号分隔) 94 string codeSerial = "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,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"; 95 public string CodeSerial 96 { 97 get { return codeSerial; } 98 set { codeSerial = value; } 99 } 100 #endregion 101 102 #region 产生波形滤镜效果 103 104 private const double PI = 3.1415926535897932384626433832795; 105 private const double PI2 = 6.283185307179586476925286766559; 106 107 /// <summary> 108 /// 正弦曲线Wave扭曲图片(Edit By 51aspx.com) 109 /// </summary> 110 /// <param name="srcBmp">图片路径</param> 111 /// <param name="bXDir">如果扭曲则选择为True</param> 112 /// <param name="nMultValue">波形的幅度倍数,越大扭曲的程度越高,一般为3</param> 113 /// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param> 114 /// <returns></returns> 115 public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase) 116 { 117 System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height); 118 119 // 将位图背景填充为白色 120 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp); 121 graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height); 122 graph.Dispose(); 123 124 double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width; 125 126 for (int i = 0; i < destBmp.Width; i++) 127 { 128 for (int j = 0; j < destBmp.Height; j++) 129 { 130 double dx = 0; 131 dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen; 132 dx += dPhase; 133 double dy = Math.Sin(dx); 134 135 // 取得当前点的颜色 136 int nOldX = 0, nOldY = 0; 137 nOldX = bXDir ? i + (int)(dy * dMultValue) : i; 138 nOldY = bXDir ? j : j + (int)(dy * dMultValue); 139 140 System.Drawing.Color color = srcBmp.GetPixel(i, j); 141 if (nOldX >= 0 && nOldX < destBmp.Width 142 && nOldY >= 0 && nOldY < destBmp.Height) 143 { 144 destBmp.SetPixel(nOldX, nOldY, color); 145 } 146 } 147 } 148 149 return destBmp; 150 } 151 152 153 154 #endregion 155 156 #region 生成校验码图片 157 public Bitmap CreateImageCode(string code) 158 { 159 int fSize = FontSize; 160 int fWidth = fSize + Padding; 161 162 int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2; 163 int imageHeight = fSize * 2 + Padding; 164 165 System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight); 166 167 Graphics g = Graphics.FromImage(image); 168 169 g.Clear(BackgroundColor); 170 171 Random rand = new Random(); 172 173 //给背景添加随机生成的燥点 174 if (this.Chaos) 175 { 176 177 Pen pen = new Pen(ChaosColor, 0); 178 int c = Length * 10; 179 180 for (int i = 0; i < c; i++) 181 { 182 int x = rand.Next(image.Width); 183 int y = rand.Next(image.Height); 184 185 g.DrawRectangle(pen, x, y, 1, 1); 186 } 187 } 188 189 int left = 0, top = 0, top1 = 1, top2 = 1; 190 191 int n1 = (imageHeight - FontSize - Padding * 2); 192 int n2 = n1 / 4; 193 top1 = n2; 194 top2 = n2 * 2; 195 196 Font f; 197 Brush b; 198 199 int cindex, findex; 200 201 //随机字体和颜色的验证码字符 202 for (int i = 0; i < code.Length; i++) 203 { 204 cindex = rand.Next(Colors.Length - 1); 205 findex = rand.Next(Fonts.Length - 1); 206 207 f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold); 208 b = new System.Drawing.SolidBrush(Colors[cindex]); 209 210 if (i % 2 == 1) 211 { 212 top = top2; 213 } 214 else 215 { 216 top = top1; 217 } 218 219 left = i * fWidth; 220 221 g.DrawString(code.Substring(i, 1), f, b, left, top); 222 } 223 224 //画一个边框 边框颜色为Color.Gainsboro 225 g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1); 226 g.Dispose(); 227 228 //产生波形(Add By 51aspx.com) 229 image = TwistImage(image, true, 8, 4); 230 231 return image; 232 } 233 #endregion 234 235 #region 将创建好的图片输出到页面 236 public void CreateImageOnPage(string code, HttpContext context) 237 { 238 System.IO.MemoryStream ms = new System.IO.MemoryStream(); 239 Bitmap image = this.CreateImageCode(code); 240 241 image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); 242 243 context.Response.ClearContent(); 244 context.Response.ContentType = "image/Jpeg"; 245 context.Response.BinaryWrite(ms.GetBuffer()); 246 247 ms.Close(); 248 ms = null; 249 image.Dispose(); 250 image = null; 251 } 252 #endregion 253 254 #region 生成随机字符码 255 public string CreateVerifyCode(int codeLen) 256 { 257 Random CheckNum = new Random(); 258 259 string code = ""; 260 261 for (int i = 0; i < codeLen; i++) 262 { 263 if(i%2==0) 264 code += (Convert.ToChar(CheckNum.Next(97, 122))).ToString(); 265 else 266 code += CheckNum.Next(0, 9).ToString(); 267 } 268 269 return code; 270 } 271 public string CreateVerifyCode() 272 { 273 return CreateVerifyCode(4); 274 } 275 #endregion 276 }
验证码显示页面

1 using System; 2 using System.Collections; 3 using System.Configuration; 4 using System.Data; 5 using System.Web; 6 using System.Web.Security; 7 using System.Web.UI; 8 using System.Web.UI.HtmlControls; 9 using System.Web.UI.WebControls; 10 using System.Web.UI.WebControls.WebParts; 11 12 using System.Drawing.Drawing2D; 13 using System.Drawing; 14 using System.Drawing.Imaging; 15 using System.IO; 16 using Px_CSLibrary.Public; 17 public partial class CheckCode : System.Web.UI.Page 18 { 19 20 21 protected void Page_Load(object sender, EventArgs e) 22 { 23 ValidatedCode v = new ValidatedCode(); 24 string checkNum = v.CreateVerifyCode(); //取随机码 25 Session["Checkcode"] = checkNum; 26 HttpCookie cookCode = new HttpCookie("Check"); 27 cookCode.Values.Add("code", checkNum);//把随机验证码保存Cookie 28 cookCode.Expires = DateTime.Now.AddMilliseconds(60000); 29 Response.Cookies.Add(cookCode); 30 31 v.CreateImageOnPage(checkNum, this.Context); // 输出图片 32 33 } 34 35 }
页面标签引用
<dd> <img id="CheckCode" alt="验证码" width="85px" height="25px" style="cursor: pointer" src="CheckCode.aspx" onclick="GetCode()" /></dd> <dd> <a href="javascript:void(0)" onclick="GetCode();">刷新</a> </dd>