验证码不用输出太多的HTML代码,直接创建一个一般处理程序,直接上代码

1  public class VCode : IHttpHandler  2     {  3   4         HttpContext context = null;  5         public void ProcessRequest(HttpContext context)  6         {  7             this.context = context;  8             CreateVImage(CreateRandomNum(4));  9         } 10  11         #region 创建随机数 CreateRandomNum(int NumCount) 12         /// 
 13         /// 创建随机数 14         /// 
 15         /// 条形码上的数字个数 16         /// 
      
       返回随机数
       17         private string CreateRandomNum(int NumCount) 18         { 19             string allChar = "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"; 20             string[] allCharArr = allChar.Split(','); 21             string randomNum = ""; 22             int temp = -1;//记录上次随机数的数值,尽量避免产生几个相同的随机数 23             Random random = new Random(); 24             for (int i = 0; i < NumCount; i++) 25             { 26                 if (temp != -1) 27                 { 28                     random = new Random(i * temp * ((int)DateTime.Now.Ticks)); 29                 } 30                 int t = random.Next(36); 31                 if (temp == t) 32                 { 33                     return CreateRandomNum(NumCount); 34                 } 35                 temp = t; 36                 randomNum += allCharArr[t]; 37             } 38             return randomNum; 39         } 40         #endregion 41  42         #region 生成验证码图片  CreateVImage(string validateNum) 43  44         /// 
 45         /// 生成验证码图片 CreateVImage(string validateNum) 46         /// 
 47         /// 验证码数字 48         private void CreateVImage(string validateNum) 49         { 50             if (validateNum == null || validateNum.Trim() == string.Empty) 51             { 52                 return; 53             } 54             //生成Bitmap图像 55             Bitmap image = new Bitmap(validateNum.Length * 12 + 10, 22); 56             Graphics g = Graphics.FromImage(image); 57             try 58             { 59                 //随机数生成 60                 Random random = new Random(); 61                 //清空图片背景色,将背景色换为白色 62                 g.Clear(Color.White); 63                 //画图片的背景线 64                 for (int i = 0; i < 25; i++) 65                 { 66                     int x1 = random.Next(image.Width); 67                     int x2 = random.Next(image.Width); 68                     int y1 = random.Next(image.Height); 69                     int y2 = random.Next(image.Height); 70                     g.DrawLine(new Pen(Brushes.Beige), x1, y1, x2, y2); 71                 } 72                 //设置字体 73                 Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic)); 74                 //设置笔刷 75                 System.Drawing.Drawing2D.LinearGradientBrush brush = 76                     new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); 77                 //用设置好的字体和笔刷将验证码写到图片上 78                 g.DrawString(validateNum, font, brush, 2, 2); 79                 //画图片上的点 80                 for (int i = 0; i < 100; i++) 81                 { 82                     int x = random.Next(image.Width); 83                     int y = random.Next(image.Height); 84                     image.SetPixel(x, y, Color.FromArgb(random.Next())); 85                 } 86  87                 //画图片边框线 88                 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width, image.Height); 89                 //创建一个内存流 90                 System.IO.MemoryStream ms = new System.IO.MemoryStream(); 91                 //将图片保存到指定流中,并指定图片格式 92                 image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); 93                 //清空缓存区所有内容输出 94                 context.Response.ClearContent(); 95                 context.Response.ContentType = "image/jpeg"; 96                 context.Response.BinaryWrite(ms.ToArray()); 97             } 98             catch (Exception ex) 99             {100                 context.Response.Write("异常..."+ex.Message);101             }102             finally103             {104                 //释放资源105                 g.Dispose();106                 image.Dispose();107             }108 109         }110         #endregion111 112         public bool IsReusable113         {114             get115             {116                 return false;117             }118         }119     }

直接复制过去,改下类名直接可用,效果图如下:

周围黑的不是验证码生成的,截图原因而已