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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 }
View Code

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 }
View Code

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>

 

posted on 2015-07-31 09:12  loyung  阅读(509)  评论(0)    收藏  举报