Aspx 验证码_各种封装

验证码

 namespace CZBK.TestProject.Common
 {
     public class ValidateCode
     {
         public ValidateCode()
         {
         }
         /// <summary>
         /// 验证码的最大长度
         /// </summary>
         public int MaxLength
         {
             get { return ; }
         }
         /// <summary>
         /// 验证码的最小长度
         /// </summary>
         public int MinLength
         {
             get { return ; }
         }
         /// <summary>
         /// 生成验证码
         /// </summary>
         /// <param name="length">指定验证码的长度</param>
         /// <returns></returns>
         public string CreateValidateCode(int length)
         {
             int[] randMembers = new int[length];
             int[] validateNums = new int[length];
             string validateNumberStr = "";
             //生成起始序列值
             int seekSeek = unchecked((int)DateTime.Now.Ticks);
             Random seekRand = new Random(seekSeek);
             int beginSeek = (int)seekRand.Next(, Int32.MaxValue - length * );
             int[] seeks = new int[length];
             for (int i = ; i < length; i++)
             {
                 beginSeek += ;
                 seeks[i] = beginSeek;
             }
             //生成随机数字
             for (int i = ; i < length; i++)
             {
                 Random rand = new Random(seeks[i]);
                 int pownum =  * (int)Math.Pow(, length);
                 randMembers[i] = rand.Next(pownum, Int32.MaxValue);
             }
             //抽取随机数字
             for (int i = ; i < length; i++)
             {
                 string numStr = randMembers[i].ToString();
                 int numLength = numStr.Length;
                 Random rand = new Random();
                 int numPosition = rand.Next(, numLength - );
                 validateNums[i] = Int32.Parse(numStr.Substring(numPosition, ));
             }
             //生成验证码
             for (int i = ; i < length; i++)
             {
                 validateNumberStr += validateNums[i].ToString();
             }
             return validateNumberStr;
         }

         /// <summary>
         /// 创建验证码的图片
         /// </summary>
         /// <param name="containsPage">要输出到的page对象</param>
         /// <param name="validateNum">验证码</param>
         public void CreateValidateGraphic(string validateCode, HttpContext context)
         {
             Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), );
             Graphics g = Graphics.FromImage(image);
             try
             {
                 //生成随机生成器
                 Random random = new Random();
                 //清空图片背景色
                 g.Clear(Color.White);
                 //画图片的干扰线
                 for (int i = ; i < ; i++)
                 {
                     int x1 = random.Next(image.Width);
                     int x2 = random.Next(image.Width);
                     int y1 = random.Next(image.Height);
                     int y2 = random.Next(image.Height);
                     g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                 }
                 Font font = new Font("Arial", , (FontStyle.Bold | FontStyle.Italic));
                 LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(, , image.Width, image.Height),
                  Color.Blue, Color.DarkRed, 1.2f, true);
                 g.DrawString(validateCode, font, brush, , );
                 //画图片的前景干扰点
                 for (int i = ; i < ; i++)
                 {
                     int x = random.Next(image.Width);
                     int y = random.Next(image.Height);
                     image.SetPixel(x, y, Color.FromArgb(random.Next()));
                 }
                 //画图片的边框线
                 g.DrawRectangle(new Pen(Color.Silver), , , image.Width - , image.Height - );
                 //保存图片数据
                 MemoryStream stream = new MemoryStream();
                 image.Save(stream, ImageFormat.Jpeg);
                 //输出图片流
                 context.Response.Clear();
                 context.Response.ContentType = "image/jpeg";
                 context.Response.BinaryWrite(stream.ToArray());
             }
             finally
             {
                 g.Dispose();
                 image.Dispose();
             }
         }
         /// <summary>
         /// 得到验证码图片的长度
         /// </summary>
         /// <param name="validateNumLength">验证码的长度</param>
         /// <returns></returns>
         public static int GetImageWidth(int validateNumLength)
         {
             return (int)(validateNumLength * 12.0);
         }
         /// <summary>
         /// 得到验证码的高度
         /// </summary>
         /// <returns></returns>
         public static double GetImageHeight()
         {
             return 22.5;
         }
     }
 }

生成缩略图-->后面直接去调用就OK了

 public class ImageHelper
    {
        #region 缩略图
        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="originalImagePath">源图路径（物理路径）</param>
        /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        /// <param name="mode">生成缩略图的方式</param>
        public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
        {
            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);

            int towidth = width;
            int toheight = height;

            int x = ;
            int y = ;
            int ow = originalImage.Width;
            int oh = originalImage.Height;

            switch (mode)
            {
                case "HW":  //指定高宽缩放（可能变形）
                    break;
                case "W":   //指定宽，高按比例
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case "H":   //指定高，宽按比例
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case "Cut": //指定高宽裁减（不变形）
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = ;
                        x = (originalImage.Width - ow) / ;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = ;
                        y = (originalImage.Height - oh) / ;
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp图片
            System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

            //新建一个画板
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

            //设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //清空画布并以透明背景色填充
            g.Clear(System.Drawing.Color.Transparent);

            //在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(originalImage, new System.Drawing.Rectangle(, , towidth, toheight), new System.Drawing.Rectangle(x, y, ow, oh), System.Drawing.GraphicsUnit.Pixel);

            try
            {
                //以jpg格式保存缩略图
                bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
        }
        #endregion
    }

水印图

  public void ProcessRequest(HttpContext context)
         {
             //生成水印图
             context.Response.ContentType = "text/plain";
           //访问该页面创建一张图片，并且该图片上写字.
             using (Bitmap map = new Bitmap(, ))//创建了一个画布
             {
                 using (Graphics g = Graphics.FromImage(map))//为画布创建了一个画笔
                 {
                     g.Clear(Color.Azure);
                     g.DrawString("传智播客", new Font("黑体", 14.0f, FontStyle.Bold), Brushes.Red, new PointF(,));
                     string fileName = Guid.NewGuid().ToString();
                     map.Save(context.Request.MapPath("/ImagePath/"+fileName+".jpg"),System.Drawing.Imaging.ImageFormat.Jpeg);//保存图片.
                 }
             }
         }

文件下载

  public void ProcessRequest(HttpContext context)
         {
             context.Response.ContentType = "text/plain";
             string encodeFileName = "aaa.txt";
             context.Response.AddHeader("Content-Disposition", string.Format("attachment;filename=\"{0}\"", encodeFileName));//在响应头中加上Content-Disposition，attachment表示以附件形式下载.
             context.Response.WriteFile("aaa.txt");
         }

文件上传

 public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
            HttpPostedFile file=context.Request.Files["fileUp"];//接收文件数据.
            if (file == null)
            {
                context.Response.Write("请选择文件!!");
            }
            else
            {
                //判断上传的文件的类型.
               string fileName= Path.GetFileName(file.FileName);//获取文件名与扩张名. aa.jpg
               string fileExt = Path.GetExtension(fileName);//获取扩展名.
               if (fileExt == ".jpg"||fileExt==".gif")
               {
                   string dir = "/ImagePath/"+DateTime.Now.Year+"/"+DateTime.Now.Month+"/"+DateTime.Now.Day+"/";
                   //创建文件夹.
                   Directory.CreateDirectory(Path.GetDirectoryName(context.Request.MapPath(dir)));
                   //需要对上传的文件进行重命名.
                   string newfileName = Guid.NewGuid().ToString();
                   string fullDir = dir + newfileName + fileExt;//构建了完整文件路径.
                 //  file.SaveAs(context.Request.MapPath(fullDir));
                 //  file.SaveAs(context.Request.MapPath("/ImagePath/"+fileName));//保存文件
                   using (Image imge = Image.FromStream(file.InputStream))//根据上传的文件流创建Image
                   {
                       using (Bitmap map = new Bitmap(imge.Width,imge.Height))
                       {
                           using (Graphics g = Graphics.FromImage(map))
                           {
                               //设置高质量插值法
                               g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

                               //设置高质量,低速度呈现平滑程度
                               g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                               //先将图片画到画布上.
                               g.DrawImage(imge, new Rectangle(, , imge.Width, imge.Height));
                               //在右下角添加水印.
                               g.DrawString("传智播客", new Font("黑体", 14.0f, FontStyle.Bold), Brushes.Red, new PointF(imge.Width-,imge.Height-));
                               map.Save(context.Request.MapPath(fullDir),System.Drawing.Imaging.ImageFormat.Jpeg);
                           }
                       }
                   }

                   context.Response.Write("<html><head></head><body><img src='"+fullDir+"'/></body></html>");
                   //最后将上传成功的图片的路径存储到数据库。
               }
               else
               {
                   context.Response.Write("文件类型错误!!");
               }

            }
        }

PageBar

  public class PageBar
     {
        /// <summary>
        /// 获取数字页码条
        /// </summary>
        /// <param name="pageIndex">当前页码值</param>
        /// <param name="pageCount">总的页数</param>
        /// <returns></returns>
        public static string GetPageBar(int pageIndex, int pageCount)
        {
            if (pageCount == )//如果只有1页，不用在显示页码条
            {
                return string.Empty;
            }
            //计算起始位置与终止位置。
            int start = pageIndex - ;//页面上显示10个数字页码
            if (start < )
            {
                start = ;
            }
            int end = start + ;//终止位置.
            if(end>pageCount)//该条件成立，需要重新计算起始位置
            {
                end=pageCount;
                start = end - >?end-:;
            }
            StringBuilder sb = new StringBuilder();
            if (pageIndex > )
            {
                sb.Append(string.Format("<a href='?pageIndex={0}'>上一页</a>",pageIndex-));
            }
            for (int i = start; i <= end; i++)
            {
                if (i == pageIndex)//如果循环的数字与当前页码相等，那么不用超链接
                {
                    sb.Append(i);
                }
                else
                {
                    sb.Append(string.Format("<a href='?pageIndex={0}'>{0}</a>",i));
                }
            }
            if (pageIndex <pageCount)
            {
                sb.Append(string.Format("<a href='?pageIndex={0}'>下一页</a>", pageIndex +));
            }
            return sb.ToString();
        }
     }