<%@ WebHandler Language="C#" Class="Downs" %>

using System;
using System.Web;
using System.IO;
using System.Linq;

public class Downs : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        DataClassesDataContext dl = new DataClassesDataContext();
        string urls = context.Request["url"];
        if (urls != "")
        {
            try
            {
                if (urls.IndexOf('/') == 0)
                {
                    FileDownload(context.Server.MapPath("~" + urls));
                }
                else
                {
                    FileDownload(context.Server.MapPath("~/" + urls));
                }
            }
            catch { }
        }
        else {
            context.Response.Write("对不起，暂无上传要下载的信息！！！");
        }
    }
    public void FileDownload(string strFullName)//下载文件绝对路径
    {
        FileInfo DownloadFile = new FileInfo(strFullName);

        HttpContext.Current.Response.Clear();
        HttpContext.Current.Response.ClearHeaders();
        HttpContext.Current.Response.Buffer = false;
        HttpContext.Current.Response.ContentType = "application/octet-stream";
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.Name, System.Text.Encoding.UTF8));
        HttpContext.Current.Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
        HttpContext.Current.Response.WriteFile(DownloadFile.FullName);//DownloadFile.FullName保存文件名
        HttpContext.Current.Response.Flush();
        HttpContext.Current.Response.End();
    }
    public bool IsReusable {
        get {
            return false;
        }
    }

}