前言
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。
再看ftp上传文件
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
/// <summary>
/// ftp地址，带ftp协议
/// </summary>
private string strFtpURI;
/// <summary>
/// ftp用户名
/// </summary>
private string strFtpUserID;
/// <summary>
/// ftp的ip地址
/// </summary>
private string strFtpServerIP;
/// <summary>
/// ftp用户登录密码
/// </summary>
private string strFtpPassword;
/// <summary>
/// ftp目录路径
/// </summary>
private string strFtpRemotePath;
#endregion /// <summary>
/// 连接FTP服务器
/// </summary>
/// <param name="strFtpServerIP">FTP连接地址</param>
/// <param name="strFtpRemotePath">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</param>
/// <param name="strFtpUserID">用户名</param>
/// <param name="strFtpPassword">密码</param>
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;
} /// <summary>
/// 上载
/// </summary>
/// <param name="strFilename">本地文件路径</param>
/// <param name="strSavePath">ftp服务器文件保存路径</param>
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(); }
/// <summary>
/// 上载
/// </summary>
/// <param name="strFilename">本地文件路径</param>
/// <param name="strSavePath">ftp服务器文件保存路径</param>
/// <param name="strStrOldName">ftp服务器文件保存的名字</param>
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);
}
}
/// <summary>
/// 下载
/// </summary>
/// <param name="strFilePath">本地保存路径</param>
/// <param name="strFileName">文件名</param>
/// <param name="strFileName">本地临时名称</param>
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)
{ }
}
/// <summary>
/// 下载
/// </summary>
/// <param name="strFilePath">本地保存路径</param>
/// <param name="strFileName">文件名</param>
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)
{ }
}
/// <summary>
/// 删除文件
/// </summary>
/// <param name="strFileName">文件名</param>
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);
}
} /// <summary>
/// 获取当前目录下明细(包含文件和文件夹)
/// </summary>
/// <returns></returns>
public string[] GetFilesDetailList()
{
try
{
StringBuilder result = new StringBuilder();
FtpWebRequest ftp;
ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI));
ftp.Credentials = new NetworkCredential(strFtpUserID, strFtpPassword);
ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
WebResponse response = ftp.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string line = reader.ReadLine();
line = reader.ReadLine();
line = reader.ReadLine();
while (line != null)
{
result.Append(line);
result.Append("\n");
line = reader.ReadLine();
}
result.Remove(result.ToString().LastIndexOf("\n"), 1);
reader.Close();
response.Close();
return result.ToString().Split('\n');
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
} /// <summary>
/// 获取FTP文件列表(包括文件夹)
/// </summary>
/// <param name="strUrl"></param>
/// <returns></returns>
private string[] GetAllList(string strUrl)
{
List<string> list = new List<string>();
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();
} /// <summary>
/// 获取当前目录下文件列表(不包括文件夹)
/// </summary>
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("<DIR>") == -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');
} /// <summary>
/// 判断当前目录下指定的文件是否存在
/// </summary>
/// <param name="strRemoteFileName">远程文件名</param>
public bool FileExist(string strRemoteFileName)
{
string[] fileList = GetFileList("*.*");
foreach (string str in fileList)
{
if (str.Trim() == strRemoteFileName.Trim())
{
return true;
}
}
return false;
}
/// <summary>
/// 创建文件夹
/// </summary>
/// <param name="strDirName">目录名</param>
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)
{
}
} /// <summary>
/// 获取指定文件大小
/// </summary>
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;
} /// <summary>
/// 更改文件名
/// </summary>
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; }
} /// <summary>
/// 移动文件
/// </summary>
public void MovieFile(string strCurrentFilename, string strNewDirectory)
{
ReName(strCurrentFilename, strNewDirectory);
} /// <summary>
/// 切换当前目录
/// </summary>
/// <param name="bIsRoot">true:绝对路径 false:相对路径</param>
public void GotoDirectory(string strDirectoryName, bool bIsRoot)
{
if (bIsRoot)
{
strFtpRemotePath = strDirectoryName;
}
else
{
strFtpRemotePath += strDirectoryName + "/";
}
strFtpURI = "ftp://" + strFtpServerIP + "/" + strFtpRemotePath + "/";
} }
对两个上传方法的测试
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： http://www.cnblogs.com/wolf-sun/p/3749683.html
总结
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。