数字验证码代码,Asp.Net代码库,德仔网

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代码分类
【Asp.Net】数字验证码
作者:Dezai.CN / 发布于2011/7/8/ 839
<div><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)
 {

 HttpContext.Current.Session[</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)">]</span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)">RndNum(</span><span style="color: rgb(128,0,128)">4</span><span style="color: rgb(0,0,0)">);
 checkCodes(HttpContext.Current.Session[</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)">].ToString());
 }</span></div>
<div></div>
<div><span style="color: rgb(0,0,0)"><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)">
 </span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> 生成随机的字母
 </span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)">
 </span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="VcodeNum"></span><span style="color: rgb(0,128,0)">生成字母的个数</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(0,128,0)">
 </span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><returns></span><span style="color: rgb(0,128,0)">string</span><span style="color: rgb(128,128,128)"></returns></span><span style="color: rgb(128,128,128)">
</span><span style="color: rgb(0,0,0)"> </span><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)"> RndNum(</span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> VcodeNum)
 {
 </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> Vchar </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)">0,1,2,3,4,5,6,7,8,9</span><span style="color: rgb(128,0,0)">"</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)">[] VcArray </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> Vchar.Split(</span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(128,0,0)">,</span><span style="color: rgb(128,0,0)">'</span><span style="color: rgb(0,0,0)">);
 </span><span style="color: rgb(0,0,255)">string</span><span style="color: rgb(0,0,0)"> VNum </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(0,0,0)">; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">由于字符串很短，就不用StringBuilder了</span><span style="color: rgb(0,128,0)">
</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)"> temp </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)">1</span><span style="color: rgb(0,0,0)">; </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">记录上次随机数值，尽量避免生产几个一样的随机数
 </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">采用一个简单的算法以保证生成随机数的不同</span><span style="color: rgb(0,128,0)">
</span><span style="color: rgb(0,0,0)"> Random rand </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)">1</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)"> VcodeNum </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)">; 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)">if</span><span style="color: rgb(0,0,0)"> (temp </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)">1</span><span style="color: rgb(0,0,0)">)
 {
 rand </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(i </span><span style="color: rgb(0,0,0)">*</span><span style="color: rgb(0,0,0)"> temp </span><span style="color: rgb(0,0,0)">*</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,255)">unchecked</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)">)DateTime.Now.Ticks));
 }
 </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> t </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> rand.Next(VcArray.Length);
 </span><span style="color: rgb(0,0,255)">if</span><span style="color: rgb(0,0,0)"> (temp </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)">1</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,0)">&&</span><span style="color: rgb(0,0,0)"> temp </span><span style="color: rgb(0,0,0)">==</span><span style="color: rgb(0,0,0)"> t)
 {
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> RndNum(VcodeNum);
 }
 temp </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> t;
 VNum </span><span style="color: rgb(0,0,0)">+=</span><span style="color: rgb(0,0,0)"> VcArray[t];
 }
 </span><span style="color: rgb(0,0,255)">return</span><span style="color: rgb(0,0,0)"> VNum;
 }</span>
<span style="font-size: small" size="3"><span style="font-size: small" size="3"><font size="2">?</font></span></span>
<div class="cnblogs_code">
<pre><div><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><summary></span><span style="color: rgb(0,128,0)">        </span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> 生成验证图片        </span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"></summary></span><span style="color: rgb(0,128,0)">        </span><span style="color: rgb(128,128,128)">///</span><span style="color: rgb(0,128,0)"> </span><span style="color: rgb(128,128,128)"><param name="checkCode"></span><span style="color: rgb(0,128,0)">验证字符</span><span style="color: rgb(128,128,128)"></param></span><span style="color: rgb(128,128,128)"></span><span style="color: rgb(0,0,0)">        </span><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)"> checkCodes(</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)">int</span><span style="color: rgb(0,0,0)"> iwidth </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)">)(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)">13</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(iwidth, </span><span style="color: rgb(128,0,128)">23</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);            g.Clear(Color.White);            </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">定义颜色</span><span style="color: rgb(0,128,0)"></span><span style="color: rgb(0,0,0)">            Color[] c </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };            </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">定义字体 </span><span style="color: rgb(0,128,0)"></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)">[] font </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)">Verdana</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">Microsoft Sans Serif</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">Comic Sans MS</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">Arial</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">, </span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(128,0,0)">宋体</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)"> };            Random rand </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)">随机输出噪点</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)">50</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)"> rand.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)"> rand.Next(image.Height);                g.DrawRectangle(</span><span style="color: rgb(0,0,255)">new</span><span style="color: rgb(0,0,0)"> Pen(Color.LightGray, </span><span style="color: rgb(128,0,128)">0</span><span style="color: rgb(0,0,0)">), x, y, </span><span style="color: rgb(128,0,128)">1</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)">);            }            </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">输出不同字体和颜色的验证码字符</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)"> checkCode.Length; 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)"> cindex </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> rand.Next(</span><span style="color: rgb(128,0,128)">7</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)"> findex </span><span style="color: rgb(0,0,0)">=</span><span style="color: rgb(0,0,0)"> rand.Next(</span><span style="color: rgb(128,0,128)">5</span><span style="color: rgb(0,0,0)">);                Font f </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(font[findex], </span><span style="color: rgb(128,0,128)">10</span><span style="color: rgb(0,0,0)">, System.Drawing.FontStyle.Bold);                Brush b </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.SolidBrush(c[cindex]);                </span><span style="color: rgb(0,0,255)">int</span><span style="color: rgb(0,0,0)"> ii </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)">;                </span><span style="color: rgb(0,0,255)">if</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)">1</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)">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)">)                {                    ii </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)">;                }                g.DrawString(checkCode.Substring(i, </span><span style="color: rgb(128,0,128)">1</span><span style="color: rgb(0,0,0)">), f, b, </span><span style="color: rgb(128,0,128)">3</span><span style="color: rgb(0,0,0)"> </span><span style="color: rgb(0,0,0)">+</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)">12</span><span style="color: rgb(0,0,0)">), ii);            }            </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">画一个边框</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.Black, </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)">, </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)">);            </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">输出到浏览器</span><span style="color: rgb(0,128,0)"></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.Jpeg);            HttpContext.Current.Response.ClearContent();            </span><span style="color: rgb(0,128,0)">//</span><span style="color: rgb(0,128,0)">Response.ClearContent();</span><span style="color: rgb(0,128,0)"></span><span style="color: rgb(0,0,0)">            HttpContext.Current.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/Jpeg</span><span style="color: rgb(128,0,0)">"</span><span style="color: rgb(0,0,0)">;            HttpContext.Current.Response.BinaryWrite(ms.ToArray());            g.Dispose();            image.Dispose();        }</span></div></pre>
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试试其它关键字
　///　　
　　　　　　　　　　　　　　　　///　　生成随机的字母　　　　　　　　　　　　　　　　///　
同语言下
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Dezai.CN贡献的其它代码(4037)