kindeditor上传图片，自动压缩过大的图片
kindeditor上传图片时自动将过大（像素以及图片长宽）的图片进行压缩，只需要在kindeditor中upload_json.ashx里面修改！
直接贴代码
<%@ webhandler Language="C#" class="Upload" %> /** * KindEditor ASP.NET * * 本ASP.NET程序是演示程序，建议不要直接在实际项目中使用。 * 如果您确定直接使用本程序，使用之前请仔细确认相关安全设置。 * */ using System; using System.Collections; using System.Web; using System.IO; using System.Globalization; using LitJson; using System.Drawing; using System.Drawing.Imaging; public class Upload : IHttpHandler { private HttpContext context; public void ProcessRequest(HttpContext context) { String aspxUrl = context.Request.Path.Substring(0, context.Request.Path.LastIndexOf("/") + 1); //文件保存目录路径 String savePath = "../attached/"; //文件保存目录URL String saveUrl = aspxUrl + "../attached/"; //定义允许上传的文件扩展名 Hashtable extTable = new Hashtable(); extTable.Add("image", "gif,jpg,jpeg,png,bmp"); extTable.Add("flash", "swf,flv"); extTable.Add("flv", "flv"); extTable.Add("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb"); extTable.Add("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2"); //最大文件大小 long maxSize = 900000000000; this.context = context; HttpPostedFile imgFile = context.Request.Files["imgFile"]; if (imgFile == null) { showError("请选择文件。"); } String dirPath = context.Server.MapPath(savePath); if (!Directory.Exists(dirPath)) { showError("上传目录不存在。"); } String dirName = context.Request.QueryString["dir"]; if (String.IsNullOrEmpty(dirName)) { dirName = "image"; } if (!extTable.ContainsKey(dirName)) { showError("目录名不正确。"); } String fileName = imgFile.FileName; String fileExt = Path.GetExtension(fileName).ToLower(); if (imgFile.InputStream == null || imgFile.InputStream.Length > maxSize) { showError("上传文件大小超过限制。"); } if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(((String)extTable[dirName]).Split(','), fileExt.Substring(1).ToLower()) == -1) { showError("上传文件扩展名是不允许的扩展名。\n只允许" + ((String)extTable[dirName]) + "格式。"); } //创建文件夹 dirPath += dirName + "/"; saveUrl += dirName + "/"; if (!Directory.Exists(dirPath)) { Directory.CreateDirectory(dirPath); } String ymd = DateTime.Now.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo); dirPath += ymd + "/"; saveUrl += ymd + "/"; if (!Directory.Exists(dirPath)) { Directory.CreateDirectory(dirPath); } String newFileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo) + fileExt; String filePath = dirPath + newFileName; imgFile.SaveAs(filePath); String fileUrl = saveUrl + newFileName; Hashtable hash = new Hashtable(); hash["error"] = 0; hash["url"] = fileUrl; string aa = "gif,jpg,jpeg,png,bmp"; if (Array.IndexOf(aa.Split(','), fileExt.Substring(1).ToLower()) != -1) { Image imggg = Image.FromFile(filePath); if (imggg.Width > 850) { imggg.Dispose(); MakeThumbnail(filePath, filePath, 850, 300, "W", fileExt); } if (imgFile.InputStream == null || imgFile.InputStream.Length > 500*1024) { MakeThumbnail(filePath, filePath, 850, 300, "W", fileExt); } } context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8"); context.Response.Write(JsonMapper.ToJson(hash)); context.Response.End(); } private void showError(string message) { Hashtable hash = new Hashtable(); hash["error"] = 1; hash["message"] = message; context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8"); context.Response.Write(JsonMapper.ToJson(hash)); context.Response.End(); } public bool IsReusable { get { return true; } } // <summary> /// 生成缩略图 /// </summary> /// <param name="originalImagePath">源图路径</param> /// <param name="thumbnailPath">缩略图路径</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:HW指定高宽缩放(可能变形);W指定宽，高按比例 H指定高，宽按比例 Cut指定高宽裁减(不变形)</param> /// <param name="mode">要缩略图保存的格式(gif,jpg,bmp,png) 为空或未知类型都视为jpg</param> public void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode, string imageType) { Image originalImage = 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 Image bitmap = new System.Drawing.Bitmap(towidth, toheight); //新建一个画板 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(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 Rectangle(0, 0, towidth, toheight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel); try { //以jpg格式保存缩略图 switch (imageType.ToLower()) { case ".gif": originalImage.Dispose(); File.Delete(originalImagePath); bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); break; case ".jpg": originalImage.Dispose(); File.Delete(originalImagePath); bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); break; case ".bmp": originalImage.Dispose(); File.Delete(originalImagePath); bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); break; case ".png": originalImage.Dispose(); File.Delete(originalImagePath); bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); break; default: originalImage.Dispose(); File.Delete(originalImagePath); bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); break; } } catch (System.Exception e) { throw e; } finally { bitmap.Dispose(); g.Dispose(); } } }
有两处需要改动。
