代码 <% @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " UpFile.aspx.cs " Inherits = " UpFile " %> <! DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN " " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " > < html xmlns = " http://www.w3.org/1999/xhtml " > < head runat = " server " > < title > 无标题页 </ title > </ head > < body > < form id = " form1 " runat = " server " > < br /> < asp:FileUpload ID = " FileUpload1 " runat = " server " /> < br /> < asp:Button ID = " Button1 " runat = " server " Text = " 上传 " OnClick = " Button1_Click " /> < asp:Label ID = " Label1 " runat = " server " ></ asp:Label > < div > </ div > </ form > </ body > </ html >
代码 using System; using System.Collections; using System.Configuration; using System.Data; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.IO; public partial class UpFile : System.Web.UI.Page{ protected void Page_Load( object sender, EventArgs e) { } protected void Button1_Click( object sender, EventArgs e) { if (FileUpload1.HasFile) { string fileContentType = FileUpload1.PostedFile.ContentType; if (fileContentType == " image/bmp " || fileContentType == " image/gif " || fileContentType == " image/pjpeg " ) { string name = FileUpload1.PostedFile.FileName; // 客户端文件路径 FileInfo file = new FileInfo(name); string fileName = file.Name; // 文件名称 string fileName_s = " s_ " + file.Name; // 缩略图文件名称 string fileName_sy = " sy_ " + file.Name; // 水印图文件名称(文字) string fileName_syp = " syp_ " + file.Name; // 水印图文件名称(图片) string webFilePath = Server.MapPath( " file/ " + fileName); // 服务器端文件路径 string webFilePath_s = Server.MapPath( " file/ " + fileName_s); // 服务器端缩略图路径 string webFilePath_sy = Server.MapPath( " file/ " + fileName_sy); // 服务器端带水印图路径(文字) string webFilePath_syp = Server.MapPath( " file/ " + fileName_syp); // 服务器端带水印图路径(图片) string webFilePath_sypf = Server.MapPath( " file/shuiyin.jpg " ); // 服务器端带水印图路径(图片) if ( ! File.Exists(webFilePath)) { if (FileUpload1.PostedFile.ContentLength < 2 * 1024 * 1024 ) // 如果图片小于2M { try { FileUpload1.SaveAs(webFilePath); // 使用saveAS方法保存文件 // AddShuiYinWord(webFilePath, webFilePath_sy); // 保存水印文字图片 // AddShuiYinPic(webFilePath, webFilePath_syp, webFilePath_sypf); // 保存添加水印图片之后的图片 MakeThumbnail(webFilePath, webFilePath_s, 130 , 130 , " Cut " ); // 生成缩略图的方法 Label1.Text = " 提示：文件“ " + fileName + " ”成功上传，并生成“ " + fileName_s + " ”缩略图，文件类型为： " + FileUpload1.PostedFile.ContentType + " ，文件大小为： " + FileUpload1.PostedFile.ContentLength + " B " ; } catch (Exception ex) { Label1.Text = " 提示：文件上传失败，失败原因： " + ex.Message; } } else { Label1.Text = " 提示：文件不能大于2M " ; } } else { Label1.Text = " 提示：文件已经存在，请重命名后上传 " ; } } else { Label1.Text = " 提示：文件类型不符 " ; } } } /// <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 = 0 ; int y = 0 ; 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 = 0 ; x = (originalImage.Width - ow) / 2 ; } else { ow = originalImage.Width; oh = originalImage.Width * height / towidth; x = 0 ; y = (originalImage.Height - oh) / 2 ; } 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( 0 , 0 , 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(); } } /// <summary> /// 在图片上增加文字水印 /// </summary> /// <param name="Path"> 原服务器图片路径 </param> /// <param name="Path_sy"> 生成的带文字水印的图片路径 </param> protected void AddShuiYinWord( string Path, string Path_sy) { string addText = " http://www.cnblogs.com/qixuejia " ; System.Drawing.Image image = System.Drawing.Image.FromFile(Path); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image); g.DrawImage(image, 0 , 0 , image.Width, image.Height); System.Drawing.Font f = new System.Drawing.Font( " Verdana " , 16 ); System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Blue); g.DrawString(addText, f, b, 15 , 15 ); g.Dispose(); image.Save(Path_sy); image.Dispose(); } /// <summary> /// 在图片上生成图片水印 /// </summary> /// <param name="Path"> 原服务器图片路径 </param> /// <param name="Path_syp"> 生成的带图片水印的图片路径 </param> /// <param name="Path_sypf"> 水印图片路径 </param> protected void AddShuiYinPic( string Path, string Path_syp, string Path_sypf) { System.Drawing.Image image = System.Drawing.Image.FromFile(Path); System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image); g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0 , 0 , copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel); g.Dispose(); image.Save(Path_syp); image.Dispose(); }}