asp.net实现ftp上传代码(解决大文件上传问题)

usingSystem;
 usingSystem.Configuration;
 usingSystem.Data;
 usingSystem.Linq;
 usingSystem.Web;
 usingSystem.Web.Security;
 usingSystem.Web.UI;
 usingSystem.Web.UI.HtmlControls;
 usingSystem.Web.UI.WebControls;
 usingSystem.Web.UI.WebControls.WebParts;
 usingSystem.Xml.Linq;
 usingSystem.IO;
 usingSystem.Net;
 usingSystem.Text;

 publicpartial class _Default : System.Web.UI.Page
 {
     //以下字段配置在web.config
     privatestring ftpServerIP = "127.0.0.1";//服务器ip
     privatestring ftpUserID = "FTPTEST";//用户名FTPTEST
     privatestring ftpPassword = "ftptest";//密码
     protectedvoid Page_Load(objectsender, EventArgs e)
     {

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

     }








     //ftp的上传功能
     privatevoid Upload(stringfilename)
     {
         FileInfo fileInf = newFileInfo(filename);

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

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

         // ftp用户名和密码
         reqFTP.Credentials = newNetworkCredential(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
         intbuffLength = 2048;

         byte[] buff = newbyte[buffLength];
         intcontentLen;

         // 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
     privatevoid Download(stringfilePath, stringfileName)
     {
         FtpWebRequest reqFTP;

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

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

             reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

             reqFTP.UseBinary = true;

             reqFTP.Credentials = newNetworkCredential(ftpUserID, ftpPassword);

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

             Stream ftpStream = response.GetResponseStream();

             longcl = response.ContentLength;

             intbufferSize = 2048;

             intreadCount;

             byte[] buffer = newbyte[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
     publicstring[] GetFileList()
     {
         string[] downloadFiles;
         StringBuilder result = newStringBuilder();
         FtpWebRequest reqFTP;
         // HttpWebRequest reqFTP;
         try
         {
             reqFTP = (FtpWebRequest)FtpWebRequest.Create(newUri("ftp://"+ ftpServerIP + "/"));
             reqFTP.UseBinary = true;
             reqFTP.Credentials = newNetworkCredential(ftpUserID, ftpPassword);
             reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
             WebResponse response = reqFTP.GetResponse();
             StreamReader reader = newStreamReader(response.GetResponseStream());
             stringline = 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();
             returnresult.ToString().Split('\n');
         }
         catch(Exception ex)
         {
             downloadFiles = null;
             returndownloadFiles;
         }
     }

     protectedvoid Button1_Click(objectsender, EventArgs e)
     {
         Upload("F:\\美国队长DVD中字.rmvb");
     }
     protectedvoid Button2_Click(objectsender, EventArgs e)
     {

     }
 }