Web浏览器导出FTP服务器上的文件

开发思路：
1.代码登录ftp服务器下载文件到服务器
2.通过web浏览器下载服务器上的文件

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Net;
using System.IO;
public partial class Test : System.Web.UI.Page
{
    public string FtpFilePath
    {
        get { return Request["filepath"]; }
    }
    private string _FtpLoginUserName = "test";
    private string _FtpLoginPassword = "123456";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (string.IsNullOrEmpty(FtpFilePath))
        {
            Response.Write("缺少重要参数：文件路径");
            Response.End();
        }
        else
        {
            //Download("ftp://192.168.0.130/Attend_Data/2015/KQ_DETAIL_201504.csv");
            Download(FtpFilePath);
        }
    }

    #region FTP服务器下载文件
    /// <summary>
    /// FTP服务器下载文件
    /// </summary>
    /// <param name="filePath"></param>
    /// <param name="fileName"></param>
    private void Download(string ftpFilePath)
    {
        FtpWebRequest reqFTP;
        try
        {
            string filePath = AppDomain.CurrentDomain.BaseDirectory + "temp\\AttendanceDataExport\\";// + "fileName.csv";
            if (!Directory.Exists(filePath))
            {
                Directory.CreateDirectory(filePath);
            }
            string ftpFileNmae = "";
            ftpFileNmae = ftpFilePath.Substring(ftpFilePath.LastIndexOf('/') + );
            if (string.IsNullOrEmpty(ftpFileNmae))
            {
                ftpFileNmae = "KQ_DETAIL_" + DateTime.Now.Ticks + ".csv";
            }
            string fileName = filePath + ftpFileNmae;
            if (File.Exists(fileName))
            {
                try
                {
                    File.Delete(fileName);
                }
                catch (Exception ex1)
                {

                }
            }
            FileStream outputStream = new FileStream(fileName, FileMode.Create);
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpFilePath));
            reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
            reqFTP.UseBinary = true;
            reqFTP.Credentials = new NetworkCredential(_FtpLoginUserName, _FtpLoginPassword);

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
            Stream ftpStream = response.GetResponseStream();
            long cl = response.ContentLength;
            int bufferSize = ;
            int readCount;
            byte[] buffer = new byte[bufferSize];
            readCount = ftpStream.Read(buffer, , bufferSize);
            while (readCount > )
            {
                outputStream.Write(buffer, , readCount);
                readCount = ftpStream.Read(buffer, , bufferSize);
            }
            ftpStream.Close();
            outputStream.Close();
            response.Close();

            ResponseExcel(fileName);

        }
        catch (System.Threading.ThreadAbortException) { }
        catch (Exception ex)
        {
            Response.Write("Download error" + ex.Message);
        }
    }

    /// <summary>
    /// 浏览器导出
    /// </summary>
    /// <param name="fileName"></param>
    private void ResponseExcel(string fileName)
    {
        try
        {
            System.IO.FileInfo file = new System.IO.FileInfo(fileName);
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.Charset = "GB2312";
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
            // 添加头信息，为"文件下载/另存为"对话框指定默认文件名
            if (Page.Request.Browser.Browser == "IE")
            {
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpContext.Current.Server.UrlEncode(file.Name));
            }
            else
            {
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
            }
            // 添加头信息，指定文件大小，让浏览器能够显示下载进度
            HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());

            // 指定返回的是一个不能被客户端读取的流，必须被下载
            HttpContext.Current.Response.ContentType = "application/ms-excel";

            // 把文件流发送到客户端
            HttpContext.Current.Response.WriteFile(file.FullName);
            // 停止页面的执行 

            HttpContext.Current.Response.End();
        }
        catch (System.Threading.ThreadAbortException) { }
        catch (Exception ex)
        {
            this.Response.Write(ex.Source + ex.Message + ex.StackTrace);
        }
    }
    #endregion
}