ASP.NetjQueryUploadify上传文件文件名乱码问题解决办法

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<!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>
    <style type="text/css">
          #preview
          {
              margin: 2px 0 0 0;
          }
          #previewImage{ border:1px solid #ddd; padding:3px;}
    </style>
    <link rel="stylesheet" type="text/css" href="jQueryPlugin/Uploadify/uploadify.css" />
<script src="js/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript" src="js/DrawImage.js"></script>
<script src="jQueryPlugin/Uploadify/jquery.uploadify-3.1.min.js" type="text/javascript"></script>
 <script type="text/javascript">
     $(function () {
         $("#uploadImage").uploadify({
             width: 100,
             height: 26,
             swf: 'jQueryPlugin/Uploadify/uploadify.swf', //[*]swf的路径
             uploader: 'HttpHandler/Uploadify.ashx', //[*]一般处理程序
             cancelImg: 'jQueryPlugin/Uploadify/uploadify-cancel.png', //取消图片路径
             multi: false,
             'fileTypeDesc': '图片文件',
             fileTypeExts: '*.gif;*.jpg;*.jpeg;*.png', //允许上传的文件类型，使用分号(”;)”分割 例如:*.jpg;*.gif,默认为null(所有文件类型)
             'fileSizeLimit': '6000KB',
             onUploadSuccess: function (file, data, response) {//上传完成时触发（每个文件触发一次）
                 if (data.indexOf('错误提示') > -1) {
                     alert(data);
                 }
                 else {
                     $("#previewImage").attr("src", data.substr(2)).hide().fadeIn(2000);
                 }
             },
             'onUploadError': function (file, errorCode, errorMsg, errorString) {//当单个文件上传出错时触发
                 alert('文件：' + file.name + ' 上传失败: ' + errorString);
             },
             buttonText: '选择图片'
         });
     });
    </script>
</head>
<body>
<form id="form1" runat="server">
     <div id="upload">
         <input type="file" name="uploadImage" id="uploadImage" />
     </div>
     <div id="preview">
         <img id="previewImage" src="images/no_pic.gif" alt="暂无图片" onload="DrawImage(this,120,120,'')" />
     </div>
</form>
</body>
</html>

Uploadify.ashx文件代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
 
using System.IO;
 
namespace CCMS.Web.HttpHandler
{
    /// <summary>
    /// Uploadify 的摘要说明
    /// </summary>
    public class Uploadify : IHttpHandler
    {
        protected string AllowExt = "7z|aiff|asf|avi|bmp|csv|doc|docx|fla|flv|gif|gz|gzip|jpeg|jpg|mid|mov|mp3|mp4|mpc|mpeg|mpg|ods|odt|pdf|png|ppt|pptx|pxd|qt|ram|rar|rm|rmi|rmvb|rtf|sdc|sitd|swf|sxc|sxw|tar|tgz|tif|tiff|txt|vsd|wav|wma|wmv|xls|xlsx|xml|zip";//支持的文件格式
        int FileMaxSize = 10240;//文件大小，单位为K
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            //context.Response.Write("Hello World");
  
            //HttpPostedFile file = context.Request.Files[0];//获取上传文件方式一
            HttpPostedFile fileUpload = context.Request.Files["Filedata"];//获取上传文件方式二
            if (fileUpload != null)
            {
                try
                {
                    string UploadDir = "~/upload/Uploadify/";//图片保存的文件夹
                    //图片保存的文件夹路径
                    string path = context.Server.MapPath(UploadDir);
                    //每天上传的图片一个文件夹
                    string folder = DateTime.Now.ToString("yyyyMM");
                    //如果文件夹不存在，则创建
                    if (!Directory.Exists(path + folder))
                    {
                        Directory.CreateDirectory(path + folder);
                    }
                    //上传图片的扩展名
                    string fileExtension = fileUpload.FileName.Substring(fileUpload.FileName.LastIndexOf('.'));
                    //判断文件格式
                    if (!CheckValidExt(fileExtension))
                    {
                        context.Response.Write("错误提示：文件格式不正确！" + fileExtension);
                        return;
                    }
                    //判断文件大小
                    if (fileUpload.ContentLength > FileMaxSize * 1024)
                    {
                        context.Response.Write("错误提示：上传的文件(" + fileUpload.FileName + ")超过最大限制：" + FileMaxSize + "KB");
                        return;
                    }
                    //保存图片的文件名
                    //string saveName = Guid.NewGuid().ToString() + fileExtension;
                    //使用时间+随机数重命名文件
                    string strDateTime = DateTime.Now.ToString("yyMMddhhmmssfff");//取得时间字符串
                    Random ran = new Random();
                    string strRan = Convert.ToString(ran.Next(100, 999));//生成三位随机数
                    string saveName = strDateTime + strRan + fileExtension;
 
                    //保存图片
                    fileUpload.SaveAs(path + folder + "/" + saveName);
                    context.Response.Write(UploadDir + folder + "/" + saveName);
                }
                catch
                {
                    context.Response.Write("错误提示：上传失败");
                }
            }
        }
 
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
 
        #region 检测扩展名的有效性 bool CheckValidExt(string sExt)
 
        /// <summary>
        /// 检测扩展名的有效性
        /// </summary>
        /// <param name="sExt">文件名扩展名</param>
        /// <returns>如果扩展名有效,返回true,否则返回false.</returns>
        public bool CheckValidExt(string strExt)
        {
            bool flag = false;
            string[] arrExt = AllowExt.Split('|');
            foreach (string filetype in arrExt)
            {
                if (filetype.ToLower() == strExt.ToLower().Replace(".", ""))
                {
                    flag = true;
                    break;
                }
            }
            return flag;
        }
        #endregion
 
    }
}