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去年在项目中用到ftp上传文件，用FtpWebRequest和FtpWebResponse封装一个帮助类，这个在网上能找到很多，前台使用Uploadify控件，然后在服务器上搭建Ftp服务器，在本地测试程序上传到ftp服务器一点问题都没有，奇怪的是当发布Web和ftp到同一个IIS下，上传文件时程序直接卡死，然后页面卡死，后来我又发现把Web和ftp分开发布在两台机器上问题又得到解决，所以当时放弃了这个方案。
前几天偶然看到Wolfy写到一个项目总结，其中提到了用ServerU搭建服务器，突然想起来，以前还弄过ServerU呢，然后我重新做了测试。 我直接把Wolfy的FtpHelper拿出来测试，大致浏览了下程序，主要思路还是利用FtpWebRequest和FtpWebResponse来实现。
public class FTPHelper { #region 字段 /// /// ftp地址，带ftp协议 /// private string strFtpURI; /// /// ftp用户名 /// private string strFtpUserID; /// /// ftp的ip地址 /// private string strFtpServerIP; /// /// ftp用户登录密码 /// private string strFtpPassword; /// /// ftp目录路径 /// private string strFtpRemotePath; #endregion /// /// 连接FTP服务器 /// /// FTP连接地址 /// 指定FTP连接成功后的当前目录, 如果不指定即默认为根目录 /// 用户名 /// 密码 public FTPHelper(string strFtpServerIP, string strFtpRemotePath, string strFtpUserID, string strFtpPassword) { this.strFtpServerIP = strFtpServerIP; this.strFtpRemotePath = strFtpRemotePath; this.strFtpUserID = strFtpUserID; this.strFtpPassword = strFtpPassword; this.strFtpURI = "ftp://" + strFtpServerIP + strFtpRemotePath; } /// /// 上载 /// /// 本地文件路径 /// ftp服务器文件保存路径 public void Upload(string strFilename, string strSavePath) { FileInfo fileInf = new FileInfo(strFilename); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strSavePath + fileInf.Name)); reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.KeepAlive = false; reqFTP.UseBinary = true; reqFTP.Proxy = null; reqFTP.ContentLength = fileInf.Length; int buffLength = 2048; byte[] buff = new byte[buffLength]; int contentLen; FileStream fs = fileInf.OpenRead(); try { Stream strm = reqFTP.GetRequestStream(); contentLen = fs.Read(buff, 0, buffLength); while (contentLen != 0) { strm.Write(buff, 0, contentLen); contentLen = fs.Read(buff, 0, buffLength); } strm.Close(); fs.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } public void Upload(HttpPostedFile file,string strSavePath) { FtpWebRequest reqFTP; //请求的 URI 对于此 FTP 命令无效 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strSavePath+file.FileName)); reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.KeepAlive = false; reqFTP.UseBinary = true; reqFTP.Proxy = null; int buffLength = 2048; byte[] buff = new byte[buffLength]; Stream stream = file.InputStream; Stream requestStream = reqFTP.GetRequestStream(); int len = stream.Read(buff, 0, buff.Length); while (len > 0) { requestStream.Write(buff, 0, buffLength); len = stream.Read(buff, 0, buffLength); } stream.Close(); requestStream.Close(); stream.Dispose(); requestStream.Dispose(); } /// /// 上载 /// /// 本地文件路径 /// ftp服务器文件保存路径 /// ftp服务器文件保存的名字 public void Upload(string strFilename, string strSavePath, string strStrOldName) { FileInfo fileInf = new FileInfo(strFilename); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strSavePath + strStrOldName)); reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.KeepAlive = false; reqFTP.UseBinary = true; reqFTP.Proxy = null; reqFTP.ContentLength = fileInf.Length; int buffLength = 2048; byte[] buff = new byte[buffLength]; int contentLen; FileStream fs = fileInf.OpenRead(); try { Stream strm = reqFTP.GetRequestStream(); contentLen = fs.Read(buff, 0, buffLength); while (contentLen != 0) { strm.Write(buff, 0, contentLen); contentLen = fs.Read(buff, 0, buffLength); } strm.Close(); fs.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// /// 下载 /// /// 本地保存路径 /// 文件名 /// 本地临时名称 public void Download(string strFilePath, string strFileName, string strLocalName) { try { FileStream outputStream = new FileStream(strFilePath + strLocalName, FileMode.Create); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strFileName)); reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); reqFTP.Method = WebRequestMethods.Ftp.DownloadFile; reqFTP.UseBinary = true; reqFTP.UsePassive = true; reqFTP.Proxy = null; 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) { } } /// /// 下载 /// /// 本地保存路径 /// 文件名 public void Download(string strFilePath, string strFileName) { try { FileStream outputStream = new FileStream(strFilePath + strFileName, FileMode.Create); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strFileName)); reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); reqFTP.Method = WebRequestMethods.Ftp.DownloadFile; reqFTP.UseBinary = true; reqFTP.UsePassive = true; reqFTP.Proxy = null; 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) { } } /// /// 删除文件 /// /// 文件名 public void Delete(string strFileName) { try { FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strFileName)); reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); reqFTP.Method = WebRequestMethods.Ftp.DeleteFile; reqFTP.KeepAlive = false; string result = String.Empty; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); long size = response.ContentLength; Stream datastream = response.GetResponseStream(); StreamReader sr = new StreamReader(datastream); result = sr.ReadToEnd(); sr.Close(); datastream.Close(); response.Close(); } catch (Exception ex) { throw new Exception(ex.Message); } } /// /// 获取当前目录下明细(包含文件和文件夹) /// /// /// 获取FTP文件列表(包括文件夹) /// /// /// list = new List (); FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri(strUrl)); req.Credentials = new NetworkCredential(strFtpPassword, strFtpPassword); req.Method = WebRequestMethods.Ftp.ListDirectory; req.UseBinary = true; req.UsePassive = true; try { using (FtpWebResponse res = (FtpWebResponse)req.GetResponse()) { using (StreamReader sr = new StreamReader(res.GetResponseStream())) { string s; while ((s = sr.ReadLine()) != null) { list.Add(s); } } } } catch (Exception ex) { throw (ex); } return list.ToArray(); } /// /// 获取当前目录下文件列表(不包括文件夹) /// public string[] GetFileList(string strUrl) { StringBuilder result = new StringBuilder(); FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strUrl)); reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(strFtpPassword, strFtpPassword); reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; WebResponse response = reqFTP.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream()); string line = reader.ReadLine(); while (line != null) { if (line.IndexOf(" ") == -1) { result.Append(Regex.Match(line, @"[\S]+ [\S]+", RegexOptions.IgnoreCase).Value.Split(' ')[1]); result.Append("\n"); } line = reader.ReadLine(); } result.Remove(result.ToString().LastIndexOf('\n'), 1); reader.Close(); response.Close(); } catch (Exception ex) { throw (ex); } return result.ToString().Split('\n'); } /// /// 判断当前目录下指定的文件是否存在 /// /// 远程文件名 public bool FileExist(string strRemoteFileName) { string[] fileList = GetFileList("*.*"); foreach (string str in fileList) { if (str.Trim() == strRemoteFileName.Trim()) { return true; } } return false; } /// /// 创建文件夹 /// /// 目录名 public void MakeDir(string strDirName) { FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strDirName)); reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); ftpStream.Close(); response.Close(); } catch (Exception ex) { } } /// /// 获取指定文件大小 /// public long GetFileSize(string strFilename) { FtpWebRequest reqFTP; long fileSize = 0; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strFilename)); reqFTP.Method = WebRequestMethods.Ftp.GetFileSize; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); fileSize = response.ContentLength; ftpStream.Close(); response.Close(); } catch (Exception ex) { throw ex; } return fileSize; } /// /// 更改文件名 /// public void ReName(string strCurrentFilename, string strNewFilename) { FtpWebRequest reqFTP; try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strCurrentFilename)); reqFTP.Method = WebRequestMethods.Ftp.Rename; reqFTP.RenameTo = strNewFilename; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse(); Stream ftpStream = response.GetResponseStream(); ftpStream.Close(); response.Close(); } catch (Exception ex) { throw ex; } } /// /// 移动文件 /// public void MovieFile(string strCurrentFilename, string strNewDirectory) { ReName(strCurrentFilename, strNewDirectory); } /// /// 切换当前目录 /// /// true:绝对路径 false:相对路径 public void GotoDirectory(string strDirectoryName, bool bIsRoot) { if (bIsRoot) { strFtpRemotePath = strDirectoryName; } else { strFtpRemotePath += strDirectoryName + "/"; } strFtpURI = "ftp://" + strFtpServerIP + "/" + strFtpRemotePath + "/"; } }
其中包含3个Upload方法，两个方法第一个参数都是本地文件的绝对路径，但是在Web页面中使用file控件在后台是得不到文件绝对路径的，只能得到文件名，于是我加了第三个方法，直接用HttpPostedFile作为方法的第一个参数，用属性InputStream作为输入流。 关于这个我问下Wolfy他是怎么调用的，他是把上传的文件先存到Web站点下，然后再上传到ftp服务器上，方法可行，我没有想到，太笨了。
public void Upload(HttpPostedFile file,string strSavePath) { FtpWebRequest reqFTP; //请求的 URI 对于此 FTP 命令无效 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + strSavePath+file.FileName)); reqFTP.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword); reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.KeepAlive = false; reqFTP.UseBinary = true; reqFTP.Proxy = null; int buffLength = 2048; byte[] buff = new byte[buffLength]; Stream stream = file.InputStream; Stream requestStream = reqFTP.GetRequestStream(); int len = stream.Read(buff, 0, buff.Length); while (len > 0) { requestStream.Write(buff, 0, buffLength); len = stream.Read(buff, 0, buffLength); } stream.Close(); requestStream.Close(); stream.Dispose(); requestStream.Dispose(); }
ServerU安装和配置教程
参考：
上传方法我直接使用HttpPostedFile测试通过，并且发布到IIS上测试通过，也可以将文件上传到web站点下再上传到ftp服务器中。Ftp服务器使用ServerU搭建。再次在测试过程中感谢Wolfy对问题的指导和回复。
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