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C#中自己生成验证码
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<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>最近写C#课程设计时，登录验证处需用到验证码，于是参照网上博客，自己封装了一个验证码类，和网上其他博客相比，有以下优点:</p>
<ul>
<li>去除了0,o,O与1,l等容易混淆的字符</li>
<li>使用方便，仅需三行代码</li>
<li>内置有返回MD5加密后的字符串的方法，便于前端调用<a id="more"></a>
</li>
</ul>
<h2 id="函数说明"><a href="#函数说明" class="headerlink" title="函数说明"></a>函数说明</h2><h3 id="公有方法"><a href="#公有方法" class="headerlink" title="公有方法"></a>公有方法</h3><ul>
<li>SecurityCode(int length);//构造函数</li>
<li>SecurityCode(int length, int width, int height);//构造函数</li>
<li>void UpdateVerifyCode();//刷新验证码</li>
<li>Bitmap getImage();//返回验证码图片</li>
<li>string MD5Encrypt();//返回经MD5加密过的验证码字符串</li>
<li>bool Check(string text);//返回校验结果(不区分大小写)</li>
</ul>
<h3 id="私有方法"><a href="#私有方法" class="headerlink" title="私有方法"></a>私有方法</h3><ul>
<li>void CreateVerificationText(int length);//随机生成验证码字符串</li>
<li>void CreateImage();//生成验证码图片</li>
<li>Color RandColor();//生成随机颜色</li>
<li>Point RandPoint();//生成随机点</li>
</ul>
<h2 id="使用示例"><a href="#使用示例" class="headerlink" title="使用示例"></a>使用示例</h2><figure class="highlight csharp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">SecurityCode Code=<span class="keyword">new</span> SecurityCode(<span class="number">4</span>);</span><br><span class="line">code.UpdateVerifyCode();</span><br><span class="line">picturebox.Image=code.getImage();</span><br></pre></td></tr></table></figure>
<h2 id="效果图"><a href="#效果图" class="headerlink" title="效果图"></a>效果图</h2><p><img data-src="/images/securitycode.jpg" alt="验证码"></p>
<h2 id="源代码"><a href="#源代码" class="headerlink" title="源代码"></a>源代码</h2><figure class="highlight csharp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">class</span> <span class="title">SecurityCode</span></span><br><span class="line">{</span><br><span class="line"> <span class="keyword">private</span> Random rand = <span class="keyword">new</span> Random();<span class="comment">//生成随机数</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">string</span> VerificationText = <span class="keyword">string</span>.Empty;<span class="comment">//验证码字符串</span></span><br><span class="line"> <span class="keyword">private</span> Bitmap map;<span class="comment">//验证码的位图</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> length;<span class="comment">//验证码的字符个数</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> width;<span class="comment">//验证码图片的宽度</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> height;<span class="comment">//验证码图片的高度</span></span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">SecurityCode</span>(<span class="params"><span class="keyword">int</span> length, <span class="keyword">int</span> width, <span class="keyword">int</span> height</span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> <span class="keyword">this</span>.length = length;</span><br><span class="line"> <span class="keyword">this</span>.width = width;</span><br><span class="line"> <span class="keyword">this</span>.height = height;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">SecurityCode</span>(<span class="params"><span class="keyword">int</span> length</span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> <span class="keyword">this</span>.length = length;</span><br><span class="line"> <span class="keyword">this</span>.width = (length + <span class="number">1</span>) * <span class="number">25</span>;</span><br><span class="line"> <span class="keyword">this</span>.height = <span class="number">40</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">//随机生成验证码字符串</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">CreateVerificationText</span>(<span class="params"><span class="keyword">int</span> length</span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> VerificationText = <span class="keyword">string</span>.Empty;</span><br><span class="line"> <span class="keyword">string</span> dictionary = <span class="string">"ABCDEFGHIJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789"</span>;<span class="comment">//去除O,o,0 ,l,1</span></span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i < length; i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">int</span> index = rand.Next(<span class="number">0</span>, dictionary.Length);</span><br><span class="line"> VerificationText += dictionary[index].ToString();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">//刷新验证码</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">UpdateVerifyCode</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> CreateVerificationText(length);</span><br><span class="line"> CreateImage();</span><br><span class="line"> <span class="comment">//Console.WriteLine(MD5Encrypt(VerificationText));//Only for test</span></span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//生成验证码图片</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">CreateImage</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> map = <span class="keyword">new</span> Bitmap(width, height);</span><br><span class="line"> Graphics g = Graphics.FromImage(map);</span><br><span class="line"> Pen pen = <span class="keyword">new</span> Pen(Color.Black);</span><br><span class="line"> <span class="keyword">string</span>[] font = { <span class="string">"Verdana"</span>, <span class="string">"Microsoft Sans Serif"</span>, <span class="string">"Consolas"</span>, <span class="string">"Arial"</span>, <span class="string">"宋体"</span> };</span><br><span class="line"> Font f = <span class="keyword">new</span> Font(<span class="string">"Arial"</span>, <span class="number">20</span>, FontStyle.Bold);</span><br><span class="line"> g.Clear(Color.White);</span><br><span class="line"> SolidBrush brush = <span class="keyword">new</span> SolidBrush(Color.White);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//绘制干扰线条</span></span><br><span class="line"> pen.Width = <span class="number">0.1F</span>;</span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i < <span class="number">15</span>; i++)</span><br><span class="line"> {</span><br><span class="line"> pen.Color = RandColor();</span><br><span class="line"> g.DrawLine(pen, RandPoint(), RandPoint());</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//绘制干扰点</span></span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i < <span class="number">80</span>; i++)</span><br><span class="line"> {</span><br><span class="line"> Point p = RandPoint();</span><br><span class="line"> map.SetPixel(p.X, p.Y, RandColor());</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//绘制字符串</span></span><br><span class="line"> SizeF StringSizeF = g.MeasureString(VerificationText, f);</span><br><span class="line"> PointF StartPoint = <span class="keyword">new</span> Point(<span class="number">0</span>, (height - (<span class="keyword">int</span>)StringSizeF.Height) / <span class="number">2</span>);</span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i < length; i++)</span><br><span class="line"> {</span><br><span class="line"> brush.Color = RandColor();</span><br><span class="line"> <span class="keyword">int</span> index = rand.Next(<span class="number">5</span>);</span><br><span class="line"> f = <span class="keyword">new</span> Font(font[index], <span class="number">20</span>, FontStyle.Bold);</span><br><span class="line"> StartPoint.X += <span class="number">5</span>;</span><br><span class="line"> g.DrawString(VerificationText[i].ToString(), f, brush, StartPoint);</span><br><span class="line"> SizeF CharSizeF = g.MeasureString(VerificationText[i].ToString(), f);</span><br><span class="line"> StartPoint.X += CharSizeF.Width;</span><br><span class="line"> }</span><br><span class="line"> g.Dispose();</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//生成随机颜色</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> Color <span class="title">RandColor</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> Color c = Color.FromArgb(rand.Next(<span class="number">1</span>, <span class="number">256</span>), rand.Next(<span class="number">1</span>, <span class="number">255</span>), rand.Next(<span class="number">1</span>, <span class="number">255</span>));</span><br><span class="line"> <span class="keyword">return</span> c;</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//生成随机点</span></span><br><span class="line"> <span class="function"><span class="keyword">private</span> Point <span class="title">RandPoint</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> <span class="keyword">int</span> x = rand.Next(<span class="number">0</span>, map.Width);</span><br><span class="line"> <span class="keyword">int</span> y = rand.Next(<span class="number">0</span>, map.Height);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> Point(x, y);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//返回验证码图片</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Bitmap <span class="title">getImage</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> <span class="keyword">return</span> map;</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//返回经MD5加密过的验证码字符串</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">string</span> <span class="title">MD5Encrypt</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> <span class="keyword">return</span> Tool.MD5Encrypt(VerificationText);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//返回校验结果</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">bool</span> <span class="title">Check</span>(<span class="params"><span class="keyword">string</span> text</span>)</span></span><br><span class="line"><span class="function"></span> {</span><br><span class="line"> <span class="keyword">return</span> text.ToUpper().Equals(VerificationText.ToUpper());<span class="comment">//不区分大小写</span></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><link rel="stylesheet" href="/css/spoiler.css" type="text/css"><script src="/js/spoiler.js" type="text/javascript" async></script>
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