.net 验证码

时间：2015-10-14 11:56:54 阅读：432 评论：0 收藏：0 [点我收藏+]

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页面:

 1 <html xmlns="http://www.w3.org/1999/xhtml">
 2 <head runat="server">
 3     <title>验证码</title>
 4     <script type="text/javascript">
 5         //换一张
 6         function change() {
 7             var img = document.getElementById("ValidateCode");
 8             img.src = img.src + ‘?‘;
 9         }
10     </script>
11 </head>
12 <body>
13     <form id="form1" runat="server">
14     <div>
15         <table>
16             <tr>
17                 <th>
18                     验证码
19                 </th>
20                 <td>
21                     <asp:TextBox runat="server" ID="tbCheckCode" CssClass="Small" MaxLength="4"></asp:TextBox>
22                 </td>
23                 <td>
24                     <img src="VerifyCode.aspx" id="ValidateCode" alt="换一张" onclick="javascript:change()" />
25                 </td>
26                 <td>
27                     <a id="ChangeCode" href="#" onclick="javascript:change()">换一张</a>
28                 </td>
29             </tr>
30             <tr>
31                 <td>
32                     <asp:Button runat="server" ID="LoginSubmit" OnClick="LoginSubmits" Text="登录" />
33                 </td>
34             </tr>
35         </table>
36     </div>
37     </form>
38 </body>
39 </html>

View Code

后台代码:

 1   /// <summary>
 2         /// 登录
 3         /// </summary>
 4         /// <param name="sender"></param>
 5         protected void LoginSubmits(object sender, EventArgs e)
 6         {
 7             CheckLogin();
 8         }
 9 
10         #region 私有方法
11         #region
12         public static Boolean IsNotNull(Object str)
13         {
14             return !IsNull(str);
15         }
16         public static Boolean IsNull(Object str)
17         {
18             return str == null;
19         }
20         public static void Show(System.Web.UI.Page page, string msg)
21         {
22             page.ClientScript.RegisterStartupScript(page.GetType(), "message",
23                 "<script language=‘javascript‘ defer>alert(‘" + msg.ToString() + "‘);</script>");
24         }
25         #endregion
26 
27         private void CheckLogin()
28         {
29             if (tbCheckCode.Text.Trim() == "")
30             {
31                 Show(this, "验证码不能为空!");
32                 return;
33             }
34             else
35             {
36                 if (IsNotNull(Session["ValidateCheckCode"]))
37                 {
38                     if (tbCheckCode.Text.Trim() != Session["ValidateCheckCode"].ToString())
39                     {
40                         Show(this, "验证码填写不正确!");
41                         tbCheckCode.Text = "";
42                         return;
43                     }
44                 }
45                 else
46                 {
47                     Show(this, "请刷新验证码！");
48                     return;
49                 }
50             }
51         }
52         #endregion
53     }
54 }

View Code

生成验证码:

  1 using System;
  2 using System.Drawing;
  3 using System.Text;
  4 using System.Web;
  5 
  6 namespace Web.TEXT
  7 {
  8     public partial class VerifyCode : System.Web.UI.Page
  9     {
 10         public Encoding GB = Encoding.GetEncoding("GB2312");
 11 
 12         protected void Page_Load(object sender, EventArgs e)
 13         {
 14             VerifyCode v = new VerifyCode();
 15 
 16             v.Length = this.length;
 17             v.FontSize = this.fontSize;
 18             v.Chaos = this.chaos;
 19             v.BackgroundColor = this.backgroundColor;
 20             v.ChaosColor = this.chaosColor;
 21             v.CodeSerial = this.codeSerial;
 22             v.Colors = this.colors;
 23             v.Fonts = this.fonts;
 24             v.Padding = this.padding;
 25             string code = v.CreateVerifyCode(); //取随机码
 26             v.CreateImageOnPage(code, this.Context); // 输出图片
 27             Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper())); // 使用Cookies取验证码的值
 28 
 29             System.Web.HttpContext.Current.Session["ValidateCheckCode"] = code;
 30             //return checkCode;
 31         }
 32 
 33         #region 验证码长度(默认4个验证码的长度)
 34 
 35         private int length = 4; 
 36 
 37         public int Length
 38         {
 39             get { return length; }
 40             set { length = value; }
 41         }
 42 
 43         #endregion
 44 
 45         #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)
 46 
 47         private int fontSize = 12;
 48 
 49         public int FontSize
 50         {
 51             get { return fontSize; }
 52             set { fontSize = value; }
 53         }
 54 
 55         #endregion
 56 
 57         #region 边框补(默认1像素)
 58 
 59         private int padding = 1;
 60 
 61         public int Padding
 62         {
 63             get { return padding; }
 64             set { padding = value; }
 65         }
 66 
 67         #endregion
 68 
 69         #region 是否输出燥点(默认不输出)
 70 
 71         private bool chaos = true;
 72 
 73         public bool Chaos
 74         {
 75             get { return chaos; }
 76             set { chaos = value; }
 77         }
 78 
 79         #endregion
 80 
 81         #region 输出燥点的颜色(默认灰色)
 82 
 83         private Color chaosColor = Color.LightGray;
 84 
 85         public Color ChaosColor
 86         {
 87             get { return chaosColor; }
 88             set { chaosColor = value; }
 89         }
 90 
 91         #endregion
 92 
 93         #region 自定义背景色(默认白色)
 94 
 95         private Color backgroundColor = Color.White;
 96 
 97         public Color BackgroundColor
 98         {
 99             get { return backgroundColor; }
100             set { backgroundColor = value; }
101         }
102 
103         #endregion
104 
105         #region 自定义随机颜色数组
106 
107         private Color[] colors =
108         {
109             Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown,
110             Color.DarkCyan, Color.Purple
111         };
112 
113         public Color[] Colors
114         {
115             get { return colors; }
116             set { colors = value; }
117         }
118 
119         #endregion
120 
121         #region 自定义字体数组
122 
123         private string[] fonts = {"Arial", "Georgia"};
124 
125         public string[] Fonts
126         {
127             get { return fonts; }
128             set { fonts = value; }
129         }
130 
131         #endregion
132 
133         #region 自定义随机码字符串序列(使用逗号分隔)
134 
135         private string codeSerial = "0,1,2,3,4,5,6,7,8,9";
136         // 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";
137        // string codeSerial = "殃,央,鸯,秧,杨,扬,佯,疡,羊,洋,阳,氧,仰,痒,养,样,漾,邀,腰,妖,瑶,摇,尧,遥,窑,谣,姚,咬,舀,药,要,耀,椰,噎,耶,爷,野,冶,也,页,掖,业,叶,曳,腋,夜,液,一,壹,医,揖,铱,依,伊,衣,颐,夷,遗,移,仪,胰,疑,沂,宜,姨,彝,椅,蚁,倚,已,乙,矣,以,艺,抑,易,邑,屹,亿,役,臆,逸,肄,疫,亦,裔,意,毅,忆,义,益,溢,诣,议,谊,译,异,翼,翌,绎,茵,荫,因,殷,音,阴,姻,吟,银,淫,寅,饮,尹,引,隐,印,英,樱,婴,鹰,应,缨,莹,萤,营,荧,蝇,迎,赢,盈,影,颖,硬,映,哟,拥,佣,臃,痈,庸,雍,踊,蛹,咏,泳,涌,永,恿,勇,用,幽,优,悠,忧,尤,由,邮,铀,犹,油,游,酉,有,友,右,佑,釉,诱,又,幼,迂,淤,于,盂,榆,虞,愚,舆,余,俞,逾,鱼,愉,渝,渔,隅,予,娱,雨,与,屿,禹,株,蛛,朱,猪,诸,诛,逐,竹,烛,煮,拄,瞩,嘱,主,著,柱,助,蛀,贮,铸,筑,住,注,祝,驻,抓,爪,拽,专,砖,转,撰,赚,篆,桩,庄,装,妆,撞,壮,状,椎,锥,追,赘,坠,缀,谆,准,捉,拙,卓,桌,琢,茁,酌,啄,着,灼,浊,兹,咨,资,姿,滋,淄,孜,紫,仔,籽,滓,子,自,渍,字,鬃,棕,踪,宗,综,总,纵,邹,走,奏,揍,租,足,卒,族,祖,诅,阻,组,钻,纂,嘴,醉,最,罪,尊,遵,昨,左,佐,柞,做,作,坐,座";
138         public string CodeSerial
139         {
140             get { return codeSerial; }
141             set { codeSerial = value; }
142         }
143 
144         #endregion
145 
146         //产生波形滤镜效果
147 
148         #region 产生波形滤镜效果
149 
150         private const double PI = 3.1415926535897932384626433832795;
151         private const double PI2 = 6.283185307179586476925286766559;
152 
153         /**/
154 
155         /// <summary>
156         /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）
157         /// </summary>
158         /// <param name="srcBmp">图片路径</param>
159         /// <param name="bXDir">如果扭曲则选择为True</param>
160         /// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>
161         /// <param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>
162         /// <returns></returns>
163         public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
164         {
165             System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
166 
167             // 将位图背景填充为白色
168             System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
169             graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
170             graph.Dispose();
171 
172             double dBaseAxisLen = bXDir ? (double) destBmp.Height : (double) destBmp.Width;
173 
174             for (int i = 0; i < destBmp.Width; i++)
175             {
176                 for (int j = 0; j < destBmp.Height; j++)
177                 {
178                     double dx = 0;
179                     dx = bXDir ? (PI2*(double) j)/dBaseAxisLen : (PI2*(double) i)/dBaseAxisLen;
180                     dx += dPhase;
181                     double dy = Math.Sin(dx);
182 
183                     // 取得当前点的颜色
184                     int nOldX = 0, nOldY = 0;
185                     nOldX = bXDir ? i + (int) (dy*dMultValue) : i;
186                     nOldY = bXDir ? j : j + (int) (dy*dMultValue);
187 
188                     System.Drawing.Color color = srcBmp.GetPixel(i, j);
189                     if (nOldX >= 0 && nOldX < destBmp.Width
190                         && nOldY >= 0 && nOldY < destBmp.Height)
191                     {
192                         destBmp.SetPixel(nOldX, nOldY, color);
193                     }
194                 }
195             }
196 
197             return destBmp;
198         }
199 
200 
201 
202         #endregion
203 
204         #region 生成校验码图片
205 
206         public Bitmap CreateImageCode(string code)
207         {
208             int fSize = FontSize;
209             int fWidth = fSize + Padding;
210 
211             int imageWidth = (int) (code.Length*fWidth) + 4 + Padding*2;
212             int imageHeight = fSize*2 + Padding;
213 
214             System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
215 
216             Graphics g = Graphics.FromImage(image);
217 
218             g.Clear(BackgroundColor);
219 
220             Random rand = new Random();
221 
222             //给背景添加随机生成的燥点
223             if (this.Chaos)
224             {
225 
226                 Pen pen = new Pen(ChaosColor, 0);
227                 int c = Length*10;
228 
229                 for (int i = 0; i < c; i++)
230                 {
231                     int x = rand.Next(image.Width);
232                     int y = rand.Next(image.Height);
233 
234                     g.DrawRectangle(pen, x, y, 1, 1);
235                 }
236             }
237 
238             int left = 0, top = 0, top1 = 1, top2 = 1;
239 
240             int n1 = (imageHeight - FontSize - Padding*2);
241             int n2 = n1/4;
242             top1 = n2;
243             top2 = n2*2;
244 
245             Font f;
246             Brush b;
247 
248             int cindex, findex;
249 
250             #region 随机字体和颜色的验证码字符
251 
252             for (int i = 0; i < code.Length; i++)
253             {
254                 cindex = rand.Next(Colors.Length - 1);
255                 findex = rand.Next(Fonts.Length - 1);
256 
257                 f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
258                 b = new System.Drawing.SolidBrush(Colors[cindex]);
259 
260                 if (i%2 == 1)
261                 {
262                     top = top2;
263                 }
264                 else
265                 {
266                     top = top1;
267                 }
268 
269                 left = i*fWidth;
270 
271                 g.DrawString(code.Substring(i, 1), f, b, left, top);
272             }
273 
274             //画一个边框 边框颜色为Color.Gainsboro
275             g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
276             g.Dispose();
277 
278             //产生波形
279             //image = TwistImage(image, true, 8, 4);
280 
281             return image;
282         }
283 
284         #endregion
285 
286         //将创建好的图片输出到页面
287         public void CreateImageOnPage(string code, HttpContext context)
288         {
289             System.IO.MemoryStream ms = new System.IO.MemoryStream();
290             Bitmap image = this.CreateImageCode(code);
291 
292             image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
293 
294             context.Response.ClearContent();
295             context.Response.ContentType = "image/Jpeg";
296             context.Response.BinaryWrite(ms.GetBuffer());
297 
298             ms.Close();
299             ms = null;
300             image.Dispose();
301             image = null;
302         }
303 
304         #endregion
305 
306         #region 生成随机字符码
307 
308         public string CreateVerifyCode(int codeLen)
309         {
310             if (codeLen == 0)
311             {
312                 codeLen = Length;
313             }
314 
315             string[] arr = CodeSerial.Split(‘,‘);
316 
317             string code = "";
318 
319             int randValue = -1;
320 
321             Random rand = new Random(unchecked((int) DateTime.Now.Ticks));
322 
323             for (int i = 0; i < codeLen; i++)
324             {
325                 randValue = rand.Next(0, arr.Length - 1);
326 
327                 code += arr[randValue];
328             }
329 
330             return code;
331         }
332 
333         public string CreateVerifyCode()
334         {
335             return CreateVerifyCode(0);
336         }
337 
338         #endregion
339     }
340 }

View Code

效果:

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.net 验证码

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原文地址：http://www.cnblogs.com/zhangjunwei87/p/4876610.html

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