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！
<%@ 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();
}
}
}
转载自：http://download.csdn.net/detail/qq_16218837/7575655
