using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.IO;using ElementLibrary.BLL;using ElementLibrary.MODEL;using System.Text;/* * LiuH * Descr:下载处理DownLoadFile.ashx * Addtime：2014/8/26 * LastModifyTime:2014/8/27 */namespace ElementLibrary.Web.Action{    /// <summary>    ///DownLoadFile 的摘要描述    /// </summary>    public class DownLoadFile : IHttpHandler    {        ElementDetailBLL elementDetailBLL = new ElementDetailBLL();        public void ProcessRequest(HttpContext context)        {            string strFunId = context.Request.QueryString["id"].ToString();//获取方法id(元件ID)            MODEL.ElementDetailInfo elementDetailInfo = elementDetailBLL.GetAllContent(strFunId);//客户端保存的文件名            string fileName = elementDetailInfo.FileName;            string strFilePath = elementDetailInfo.FilePath;            string filePath = context.Server.MapPath(strFilePath);//路径            FileInfo fileInfo = new FileInfo(filePath);            context.Response.Clear();            context.Response.ClearContent();            context.Response.ClearHeaders();           //解决文件名乱码（LiuH AddTime:2014/8/28）            if (context.Request.UserAgent.Contains("MSIE") || context.Request.UserAgent.Contains("msie"))            {                // 如果客户端使用 Microsoft Internet Explorer，则需要编码                 fileName = ToHexString(fileName);             }            context.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);            context.Response.AddHeader("Content-Length", fileInfo.Length.ToString());            context.Response.AddHeader("Content-Transfer-Encoding", "binary");            context.Response.ContentType = "application/octet-stream";            context.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");            context.Response.WriteFile(fileInfo.FullName);            context.Response.Flush();            //fileInfo.Delete();            context.Response.End();        }        /// <summary>        /// 为字符串中的非英文字符编码        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        public static string ToHexString(string s)        {            char[] chars = s.ToCharArray();            StringBuilder builder = new StringBuilder();            for (int index = 0; index < chars.Length; index++)            {                bool needToEncode = NeedToEncode(chars[index]);                if (needToEncode)                {                    string encodedString = ToHexString(chars[index]);                    builder.Append(encodedString);                }                else                {                    builder.Append(chars[index]);                }            }            return builder.ToString();        }        /// <summary>        ///指定 一个字符是否应该被编码        /// </summary>        /// <param name="chr"></param>        /// <returns></returns>        private static bool NeedToEncode(char chr)        {            string reservedChars = "$-_.+!*‘(),@=&";            if (chr > 127)                return true;            if (char.IsLetterOrDigit(chr) || reservedChars.IndexOf(chr) >= 0)                return false;            return true;        }        /// <summary>        /// 为非英文字符串编码        /// </summary>        /// <param name="chr"></param>        /// <returns></returns>        private static string ToHexString(char chr)        {            UTF8Encoding utf8 = new UTF8Encoding();            byte[] encodedBytes = utf8.GetBytes(chr.ToString());            StringBuilder builder = new StringBuilder();            for (int index = 0; index < encodedBytes.Length; index++)            {                builder.AppendFormat("%{0}", Convert.ToString(encodedBytes[index], 16));            }            return builder.ToString();        }        public bool IsReusable        {            get            {                return false;            }        }    }}