上传图片到FTP的实例

            string imgPath = string.Empty;//图片路径
            string ftpFileName = System.Configuration.ConfigurationManager.AppSettings["QuickLink"];//在配置文件中定义存图片的文件夹
            HttpFileCollectionBase httpFiles = Request.Files;

            #region 上传图片相关处理
            HttpPostedFileBase imgPathFile = httpFiles["fileImgPath"];  //获取界面传来的图片路径           
 7             //如果界面传来的文件名不为空，则把图片上传到FTP，并返回FTP路径 
            if (!string.IsNullOrEmpty(imgPathFile.FileName))
            {
                imgPath = FtpUpImage(ftpFileName, link.ID.ToString(), imgPathFile);//把图片上传至FTP
                link.ImgPath = imgPath;
            }
            #endregion

       #region FTP文件上传
        /// <summary>
        /// 快速链接图片上传
        /// </summary>
        /// <param name="path">文件路径</param>
        /// <param name="fileName">文件夹名</param>
        /// <returns></returns>
        public string FtpUpImage(string ftpFileName, string linkId, HttpPostedFileBase uploadImage)
        {
            string imgPath = string.Empty;   //图片路径
            string fileName = string.Empty;  //文件名           
            string ftpPath = string.Empty;   //FTP路径

            fileName = uploadImage.FileName;//上传的图片名称

            int len = fileName.Split('.').Length;
            string extName = fileName.Split('.')[len - 1].ToString();//文件后缀名                 
            string fName = linkId + "." + extName;//文件名
            //判断本地是否存在这个文件夹
            if (!Directory.Exists(Server.MapPath("../UploadFile/LinkImage")))
            {
                Directory.CreateDirectory(Server.MapPath("../UploadFile/LinkImage"));
            }
            imgPath = Server.MapPath("../UploadFile/LinkImage/") + fName;//本地路径
            uploadImage.SaveAs(imgPath); //保存到项目组中                   

            #region 上传至FTP
            //判断文件夹是否存在，并上传至FTP
            if (CommonHelper.FtpCreateFolder(ftpFileName))
            {
                string FTPServiceIP = ConfigurationManager.AppSettings["FTPServiceIP"]; //FTP服务器地址
                string folderPath = string.Format("ftp://{0}/{1}", FTPServiceIP, ftpFileName); //FTP的文件夹路径
                string fPath = string.Format("ftp://{0}/{1}/{2}", FTPServiceIP, ftpFileName, fName); //FTP的文件路径

                //判断文件是否已存在，如果已存在则先删除文件再上传
                if (!saveList.CheckDirectory(folderPath, fName))
                {
                    ftpPath = CommonHelper.FtpUploadCommon(imgPath, ftpFileName);//获取FTP的图片路径  
                }
                else
                {
                    saveList.DeleteFile(fPath);//删除FTP已存在的文件
                    ftpPath = CommonHelper.FtpUploadCommon(imgPath, ftpFileName);//获取FTP的图片路径  
                }
            }
            #endregion

            //删除本地存储的图片
            FileInfo file = new FileInfo(imgPath);
            if (file.Exists)
            {
                file.Delete(); //删除单个文件   
            }
        
            return ftpPath;
        }
        #endregion

//FTP上传公用方法

  /// <summary>
        /// FTP上传公用方法
        /// </summary>
        /// <param name="filename">源文件物理地址</param>
        /// <param name="ftpFolderName">Ftp服务器上目录名称</param>
        public static string FtpUploadCommon(string filename, string ftpFolderName)
        {
            string ftpServerIP = ConfigurationManager.AppSettings["FTPServiceIP"];
            string ftpUserID = ConfigurationManager.AppSettings["FTPUserName"];
            string ftpPassword = ConfigurationManager.AppSettings["FTPPwd"];
            string excelFolder = ftpFolderName;
            string downLoadIp = ConfigurationManager.AppSettings["FTPView"];
            if (!downLoadIp.Substring(10).Contains("/"))
            {
                downLoadIp = downLoadIp + "/";
            }

            FileInfo fileInf = new FileInfo(filename);

            string downloadUrl = (downLoadIp.Contains("http://") ? string.Empty : "http://") + downLoadIp + excelFolder + "/" + fileInf.Name;
            FtpWebRequest reqFTP;

            // 根据uri创建FtpWebRequest对象 
            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + excelFolder + "/" + 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();
                return downloadUrl;
            }
            catch (Exception ex)
            {
                HttpContext.Current.Response.Write("Upload Error：" + ex.Message);
                return string.Empty;
            }
        }

 // FTP删除操作

  #region FTP删除操作
        /// <summary>
        /// FTP删除操作
        /// </summary>
        /// <param name="ftpPath">路径</param>
        /// <param name="userId">用户名</param>
        /// <param name="pwd">密码</param>
        /// <param name="fileName">文件名</param>
        /// <returns></returns>
        public string DeleteFile(string ftpPath)
        {
            string sRet = "删除成功！";
            FtpWebResponse Respose = null;
            FtpWebRequest reqFTP = null;
            Stream localfile = null;
            Stream stream = null;
            try
            {
                //根据uri创建FtpWebRequest对象  
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpPath));

                //提供账号密码的验证  
                reqFTP.Credentials = new NetworkCredential(FTPUserName, FTPPwd);

                //默认为true是上传完后不会关闭FTP连接  
                reqFTP.KeepAlive = false;

                //执行删除操作
                reqFTP.Method = WebRequestMethods.Ftp.DeleteFile;

                Respose = (FtpWebResponse)reqFTP.GetResponse();
            }
            catch (Exception ex)
            {
                sRet = ex.Message;
                LogHelper.Error("Error", "TOpOfferSaveListBusiness.DeleteFile", ex);
            }

            finally
            {
                //关闭连接跟流
                if (Respose != null)
                    Respose.Close();
                if (localfile != null)
                    localfile.Close();
                if (stream != null)
                    stream.Close();
            }

            //返回执行状态
            return sRet;
        }
 #endregion