字母与数字混合的验证码代码,Asp.Net代码库,德仔网

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代码分类
【Asp.Net】字母与数字混合的验证码
作者:Dezai.CN / 发布于2011/7/8/ 816
<div><span style="color: rgb(0,0,0)"></span><span style="color: rgb(0,0,255)">protected</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">void</span><span style="color: rgb(0,0,0)"> Page_Load(</span><span style="color: rgb(0,0,255)">object</span><span style="color: rgb(0,0,0)"> sender, EventArgs e)
 {
 CreateCheckCodeImage(GenerateCheckCode());
 }</span></div>
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<div><span style="color: rgb(0,0,0)"><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">void</span><span style="color: rgb(0,0,0)"> CreateCheckCodeImage(</span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> checkCode)
 {
 </span><span style="color: rgb(0,0,255)">if</span><span style="color: rgb(0,0,0)"> (checkCode </span><span style="color: rgb(0,0,0)">==</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">null</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,0)">||</span><span style="color: rgb(0,0,0)"> checkCode.Trim() </span><span style="color: rgb(0,0,0)">==</span><span style="color: rgb(0,0,0)"> String.Empty)
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)">;

 System.Drawing.Bitmap image </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> System.Drawing.Bitmap((</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)">)Math.Ceiling((checkCode.Length </span><span style="color: rgb(0,0,0)">*</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">12.5</span><span style="color: rgb(0,0,0)">)), </span><span style="color: rgb(128,0,128)">22</span><span style="color: rgb(0,0,0)">);
 Graphics g </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Graphics.FromImage(image);

 </span><span style="color: rgb(0,0,255)">try</span><span style="color: rgb(0,0,0)">
 {
 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">生成随机生成器</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> Random random </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> Random();

 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">清空图片背景色</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> g.Clear(Color.White);

 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">画图片的背景噪音线</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">for</span><span style="color: rgb(0,0,0)"> (</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> i </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">; i </span><span style="color: rgb(0,0,0)"><</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">2</span><span style="color: rgb(0,0,0)">; i</span><span style="color: rgb(0,0,0)">++</span><span style="color: rgb(0,0,0)">)
 {
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> x1 </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> random.Next(image.Width);
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> x2 </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> random.Next(image.Width);
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> y1 </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> random.Next(image.Height);
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> y2 </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> random.Next(image.Height);

 g.DrawLine(</span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> Pen(Color.Black), x1, y1, x2, y2);
 }

 Font font </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> System.Drawing.Font(</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">Arial</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">12</span><span style="color: rgb(0,0,0)">, (System.Drawing.FontStyle.Bold));
 System.Drawing.Drawing2D.LinearGradientBrush brush </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> System.Drawing.Drawing2D.LinearGradientBrush(</span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> Rectangle(</span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, image.Width, image.Height), Color.Blue, Color.DarkRed, </span><span style="color: rgb(128,0,128)">1.2f</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(0,0,255)">true</span><span style="color: rgb(0,0,0)">);
 g.DrawString(checkCode, font, brush, </span><span style="color: rgb(128,0,128)">2</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">2</span><span style="color: rgb(0,0,0)">);

 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">画图片的前景噪音点</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">for</span><span style="color: rgb(0,0,0)"> (</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> i </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">; i </span><span style="color: rgb(0,0,0)"><</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">100</span><span style="color: rgb(0,0,0)">; i</span><span style="color: rgb(0,0,0)">++</span><span style="color: rgb(0,0,0)">)
 {
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> x </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> random.Next(image.Width);
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> y </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> random.Next(image.Height);

 image.SetPixel(x, y, Color.FromArgb(random.Next()));
 }

 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">画图片的边框线</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> g.DrawRectangle(</span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> Pen(Color.Silver), </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">, image.Width </span><span style="color: rgb(0,0,0)">-</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">1</span><span style="color: rgb(0,0,0)">, image.Height </span><span style="color: rgb(0,0,0)">-</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">1</span><span style="color: rgb(0,0,0)">);

 System.IO.MemoryStream ms </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> System.IO.MemoryStream();
 image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
 Response.ClearContent();
 Response.ContentType </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">image/Gif</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">;
 Response.BinaryWrite(ms.ToArray());
 }
 </span><span style="color: rgb(0,0,255)">finally</span><span style="color: rgb(0,0,0)">
 {
 g.Dispose();
 image.Dispose();
 }
 }</span></span></div>
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<div><span style="color: rgb(0,0,0)"><span style="color: rgb(0,0,0)"><span style="color: rgb(0,0,255)">private</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> GenerateCheckCode()
 {
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> number;
 </span><span style="color: rgb(0,0,255)">char</span><span style="color: rgb(0,0,0)"> code;
 </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> checkCode </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> String.Empty;

 Random random </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> Random();

 </span><span style="color: rgb(0,0,255)">for</span><span style="color: rgb(0,0,0)"> (</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> i </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">; i </span><span style="color: rgb(0,0,0)"><</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">4</span><span style="color: rgb(0,0,0)">; i</span><span style="color: rgb(0,0,0)">++</span><span style="color: rgb(0,0,0)">)
 {
 number </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> random.Next();

 </span><span style="color: rgb(0,0,255)">if</span><span style="color: rgb(0,0,0)"> (number </span><span style="color: rgb(0,0,0)">%</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">2</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,0)">==</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">)
 code </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> (</span><span style="color: rgb(0,0,255)">char</span><span style="color: rgb(0,0,0)">)(</span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(128,0,0)">0</span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,0)">+</span><span style="color: rgb(0,0,0)"> (</span><span style="color: rgb(0,0,255)">char</span><span style="color: rgb(0,0,0)">)(number </span><span style="color: rgb(0,0,0)">%</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">10</span><span style="color: rgb(0,0,0)">));
 </span><span style="color: rgb(0,0,255)">else</span><span style="color: rgb(0,0,0)">
 code </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> (</span><span style="color: rgb(0,0,255)">char</span><span style="color: rgb(0,0,0)">)(</span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(128,0,0)">A</span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,0)">+</span><span style="color: rgb(0,0,0)"> (</span><span style="color: rgb(0,0,255)">char</span><span style="color: rgb(0,0,0)">)(number </span><span style="color: rgb(0,0,0)">%</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,0,128)">26</span><span style="color: rgb(0,0,0)">));

 checkCode </span><span style="color: rgb(0,0,0)">+=</span><span style="color: rgb(0,0,0)"> code.ToString();
 }

 Response.Cookies.Add(</span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> HttpCookie(</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">CheckCode</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">, checkCode));

 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> checkCode;
 }</span></span></span></div>
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