验证码通用类代码,Asp.Net代码库,德仔网

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【Asp.Net】验证码通用类
作者:Dezai.CN / 发布于2011/7/22/ 3154
<div>
<div>using System;</div>
<div>using System.Collections;</div>
<div>using System.ComponentModel;</div>
<div>using System.Data;</div>
<div>using System.Drawing;</div>
<div>using System.Web;</div>
<div>using System.Web.SessionState;</div>
<div>using System.Web.UI;</div>
<div>using System.Web.UI.WebControls;</div>
<div>using System.Web.UI.HtmlControls;</div>
<div>namespace WebApplication1.验证码</div>
<div>{</div>
<div>/// <summary></div>
<div>/// 完美随机验证码 0.10</div>
<div>/// Verion:0.10</div>
<div>/// Description:随机生成设定验证码，并随机旋转一定角度，字体颜色不同</div>
<div>/// </summary></div>
<div>public class ValidateCode : System.Web.UI.Page</div>
<div>{</div>
<div>private void Page_Load(object sender, System.EventArgs e)</div>
<div>{</div>
<div>string randomcode = this.CreateRandomCode(4);</div>
<div>Session["ValidateCode"] = randomcode;</div>
<div>//ViewState["ValidateCode"] = randomcode;</div>
<div>this.CreateImage(randomcode);</div>
<div>}
<div>/// <summary></div>
<div>/// 生成随机码</div>
<div>/// </summary></div>
<div>/// <param name="length">随机码个数</param></div>
<div>/// <returns></returns></div>
<div>private string CreateRandomCode(int length)</div>
<div>{</div>
<div>int rand;</div>
<div>char code;</div>
<div>string randomcode = String.Empty;</div>
<div>//生成一定长度的验证码</div>
<div>System.Random random = new Random();</div>
<div>for(int i=0;i<length;i++)</div>
<div>{</div>
<div>rand = random.Next();</div>
if(rand%3 == 0)</div>
<div>{</div>
<div>code = (char)('A' + (char)(rand%26));</div>
<div>}
<div>else</div>
<div>{</div>
<div>code = (char)('0' + (char)(rand%10));</div>
<div>}
<div>randomcode += code.ToString();</div>
<div>}
<div>return randomcode;</div>
<div>}
<div>/// <summary></div>
<div>/// 创建随机码图片</div>
<div>/// </summary></div>
<div>/// <param name="randomcode">随机码</param></div>
<div>private void CreateImage(string randomcode)</div>
<div>{</div>
<div>int randAngle = 45; //随机转动角度</div>
<div>int mapwidth = (int)(randomcode.Length * 23);</div>
<div>Bitmap map = new Bitmap(mapwidth,28);//创建图片背景</div>
<div>Graphics graph = Graphics.FromImage(map);</div>
<div>graph.Clear(Color.AliceBlue);//清除画面，填充背景</div>
<div>graph.DrawRectangle(new Pen(Color.Black,0),0,0,map.Width-1,map.Height-1);//画一个边框</div>
<div>//graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式</div>
<div>Random rand = new Random();</div>
<div>//背景噪点生成</div>
<div>Pen blackPen = new Pen(Color.LightGray,0);</div>
<div>for (int i=0;i<50;i++)</div>
<div>{</div>
<div>int x = rand.Next(0,map.Width);</div>
<div>int y = rand.Next(0,map.Height);</div>
<div>graph.DrawRectangle(blackPen,x,y,1,1);</div>
<div>}
<div>//验证码旋转，防止机器识别</div>
<div>char[] chars = randomcode.ToCharArray();//拆散字符串成单字符数组</div>
<div>//文字距中</div>
<div>StringFormat format = new StringFormat(StringFormatFlags.NoClip);</div>
<div>format.Alignment = StringAlignment.Center;</div>
<div>format.LineAlignment = StringAlignment.Center;</div>
<div>//定义颜色</div>
<div>Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };</div>
<div>//定义字体</div>
<div>string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };</div>
<div>for(int i=0;i<chars.Length;i++)</div>
<div>{</div>
<div>int cindex = rand.Next(7);</div>
<div>int findex = rand.Next(5);</div>
<div>Font f = new System.Drawing.Font(font[findex],13,System.Drawing.FontStyle.Bold);//字体样式(参数2为字体大小)</div>
<div>Brush b = new System.Drawing.SolidBrush(c[cindex]);</div>
<div>Point dot = new Point(16,16);</div>
<div>//graph.DrawString(dot.X.ToString(),fontstyle,new SolidBrush(Color.Black),10,150);//测试X坐标显示间距的</div>
<div>float angle = rand.Next(-randAngle,randAngle);//转动的度数</div>
<div>graph.TranslateTransform(dot.X,dot.Y);//移动光标到指定位置</div>
<div>graph.RotateTransform(angle);</div>
<div>graph.DrawString(chars[i].ToString(),f,b,1,1,format);</div>
<div>//graph.DrawString(chars[i].ToString(),fontstyle,new SolidBrush(Color.Blue),1,1,format);</div>
<div>graph.RotateTransform(-angle);//转回去</div>
<div>graph.TranslateTransform(2,-dot.Y);//移动光标到指定位置</div>
<div>}
<div>//graph.DrawString(randomcode,fontstyle,new SolidBrush(Color.Blue),2,2); //标准随机码</div>
<div>//生成图片</div>
<div>System.IO.MemoryStream ms = new System.IO.MemoryStream();</div>
<div>map.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);</div>
<div>Response.ClearContent();</div>
<div>Response.ContentType = "image/gif";</div>
<div>Response.BinaryWrite(ms.ToArray());</div>
<div>graph.Dispose();</div>
<div>map.Dispose();</div>
<div>}
<div>region Web 窗体设计器生成的代码</div>
<div>override protected void OnInit(EventArgs e)</div>
<div>{</div>
<div>//</div>
<div>// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。</div>
<div>//</div>
<div>InitializeComponent();</div>
<div>base.OnInit(e);</div>
<div>}
<div>/// <summary></div>
<div>/// 设计器支持所需的方法 - 不要使用代码编辑器修改</div>
<div>/// 此方法的内容。</div>
<div>/// </summary></div>
<div>private void InitializeComponent()</div>
<div>{</div>
<div>this.Load += new System.EventHandler(this.Page_Load);</div>
<div>}
<div>endregion</div>
<div>}
<div>}
</div>
<div></div>
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