/// <summary> /// 生成缩略图 /// </summary> /// <param name="originalImagePath">源图路径(相对路径)</param> /// <param name="thumbnailPath">缩略图路径(相对路径)</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(Utils.GetMapPath(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 { //保存缩略图 bitmap.Save(Utils.GetMapPath(thumbnailPath)); } catch (System.Exception e) { throw e; } finally { originalImage.Dispose(); bitmap.Dispose(); g.Dispose(); } }
/// <summary> /// 文件上传方法 /// </summary> /// <param name="postedFile">文件流</param> /// <param name="isThumbnail">是否生成缩略图</param> /// <param name="isWater">是否打水印</param> /// <returns>上传后文件信息</returns> public string fileSaveAs(HttpPostedFile postedFile, bool isThumbnail, bool isWater) { try { string fileExt = Utils.GetFileExt(postedFile.FileName); //文件扩展名,不含“.” int fileSize = postedFile.ContentLength; //获得文件大小,以字节为单位 string fileName = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf(@"\") + 1); //取得原文件名 string newFileName = Utils.GetRamCode() + "." + fileExt; //随机生成新的文件名 string newThumbnailFileName = newFileName; //随机生成缩略图文件名 string upLoadPath = GetUpLoadPath(); //上传目录相对路径 string fullUpLoadPath = Utils.GetMapPath(upLoadPath); //上传目录的物理路径 string newFilePath = upLoadPath + newFileName; //上传后的路径 string newThumbnailPath = upLoadPath + newThumbnailFileName; //上传后的缩略图路径 //检查文件扩展名是否合法 //if (!CheckFileExt(fileExt)) //{ // return "{\"status\": 0, \"msg\": \"不允许上传" + fileExt + "类型的文件!\"}"; //} //检查文件大小是否合法 if (!CheckFileSize(fileExt, fileSize)) { return("{\"status\": 0, \"msg\": \"文件超过限制的大小啦!\"}"); } //检查上传的物理路径是否存在,不存在则创建 if (!Directory.Exists(fullUpLoadPath)) { Directory.CreateDirectory(fullUpLoadPath); } //保存文件 postedFile.SaveAs(fullUpLoadPath + newThumbnailFileName); //如果是图片,检查图片是否超出最大尺寸,是则裁剪 //if (IsImage(fileExt) && (this.siteConfig.imgmaxheight > 0 || this.siteConfig.imgmaxwidth > 0)) //{ // Thumbnail.MakeThumbnailImage(fullUpLoadPath + newFileName, fullUpLoadPath + newFileName, // this.siteConfig.imgmaxwidth, this.siteConfig.imgmaxheight); //} ////如果是图片,检查是否需要生成缩略图,是则生成 //if (IsImage(fileExt) && isThumbnail && this.siteConfig.thumbnailwidth > 0 && this.siteConfig.thumbnailheight > 0) //{ // Thumbnail.MakeThumbnailImage(fullUpLoadPath + newFileName, fullUpLoadPath + newThumbnailFileName, // this.siteConfig.thumbnailwidth, this.siteConfig.thumbnailheight, "Cut"); //} ////如果是图片,检查是否需要打水印 //if (IsWaterMark(fileExt) && isWater) //{ // switch (this.siteConfig.watermarktype) // { // case 1: // WaterMark.AddImageSignText(newFilePath, newFilePath, // this.siteConfig.watermarktext, this.siteConfig.watermarkposition, // this.siteConfig.watermarkimgquality, this.siteConfig.watermarkfont, this.siteConfig.watermarkfontsize); // break; // case 2: // WaterMark.AddImageSignPic(newFilePath, newFilePath, // this.siteConfig.watermarkpic, this.siteConfig.watermarkposition, // this.siteConfig.watermarkimgquality, this.siteConfig.watermarktransparency); // break; // } //} //处理完毕,返回JOSN格式的文件信息 return("{\"status\": 1, \"msg\": \"上传文件成功!\", \"name\": \"" + fileName + "\", \"path\": \"" + newFilePath + "\", \"thumb\": \"" + newThumbnailPath + "\", \"size\": " + fileSize + ", \"ext\": \"" + fileExt + "\"}"); } catch { return("{\"status\": 0, \"msg\": \"上传过程中发生意外错误!\"}"); } }