20160113006 asp.net实现ftp上传代码(解决大文件上传问题)

using System;
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.IO;
using System.Net;
using System.Text;

public partial class _Default : System.Web.UI.Page
{
    //以下字段配置在web.config
    private string ftpServerIP = "127.0.0.1";//服务器ip
    private string ftpUserID = "FTPTEST";//用户名FTPTEST
    private string ftpPassword = "ftptest";//密码
    protected void Page_Load(object sender, EventArgs e)
    {

        if (MyFile.Value != "")
        {
            //string a = MyFile.;
        }
       
    }

    //ftp的上传功能
    private void Upload(string filename)
    {
        FileInfo fileInf = new FileInfo(filename);

        string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
        FtpWebRequest reqFTP;

        // 根据uri创建FtpWebRequest对象
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));

        // ftp用户名和密码
        reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

        // 默认为true，连接不会被关闭
// 在一个命令之后被执行
        reqFTP.KeepAlive = false;

        // 指定执行什么命令
        reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

        // 指定数据传输类型
        reqFTP.UseBinary = true;

        // 上传文件时通知服务器文件的大小
        reqFTP.ContentLength = fileInf.Length;

        // 缓冲大小设置为2kb
        int buffLength = 2048;

        byte[] buff = new byte[buffLength];
        int contentLen;

        // 打开一个文件流 (System.IO.FileStream) 去读上传的文件
        FileStream fs = fileInf.OpenRead();
        try
        {
            // 把上传的文件写入流
            Stream strm = reqFTP.GetRequestStream();

            // 每次读文件流的2kb
            contentLen = fs.Read(buff, 0, buffLength);

            // 流内容没有结束
            while (contentLen != 0)
            {
                // 把内容从file stream 写入 upload stream
                strm.Write(buff, 0, contentLen);

                contentLen = fs.Read(buff, 0, buffLength);
            }

            // 关闭两个流
            strm.Close();
            fs.Close();
            this.Page.RegisterStartupScript("", "<script>alert(‘成功‘)</script>");
        }
        catch (Exception ex)
        {
            // MessageBox.Show(ex.Message, "Upload Error");
            Response.Write("Upload Error：" + ex.Message);
        }
    }

    //从ftp服务器上下载文件的功能
    private void Download(string filePath, string fileName)
    {
        FtpWebRequest reqFTP;

        try
        {
            FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);

            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileName));

            reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

            reqFTP.UseBinary = true;

            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

            FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

            Stream ftpStream = response.GetResponseStream();

            long cl = response.ContentLength;

            int bufferSize = 2048;

            int readCount;

            byte[] buffer = new byte[bufferSize];

            readCount = ftpStream.Read(buffer, 0, bufferSize);

            while (readCount > 0)
            {
                outputStream.Write(buffer, 0, readCount);

                readCount = ftpStream.Read(buffer, 0, bufferSize);
            }

            ftpStream.Close();

            outputStream.Close();

            response.Close();
        }
        catch (Exception ex)
        {
            Response.Write("Download Error：" + ex.Message);
        }
    }

    //从ftp服务器上获得文件列表
    public string[] GetFileList()
    {
        string[] downloadFiles;
        StringBuilder result = new StringBuilder();
        FtpWebRequest reqFTP;
        // HttpWebRequest reqFTP;
        try
        {
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/"));
            reqFTP.UseBinary = true;
            reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
            reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
            WebResponse response = reqFTP.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream());
            string line = reader.ReadLine();
            while (line != null)
            {
                result.Append(line);
                result.Append("\n");
                line = reader.ReadLine();
            }
            // to remove the trailing ‘\n‘       
            result.Remove(result.ToString().LastIndexOf(‘\n‘), 1);
            reader.Close();
            response.Close();
            return result.ToString().Split(‘\n‘);
        }
        catch (Exception ex)
        {
            downloadFiles = null;
            return downloadFiles;
        }
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        Upload("F:\\美国队长DVD中字.rmvb");
    }
    protected void Button2_Click(object sender, EventArgs e)
    {

    }
}

原文：http://www.cnblogs.com/hutie1980/p/5127672.html