本文转载自《C# Ftp操作工具类》,仅对原文格式进行了整理。

介绍了几种FTP操作的函数,供后期编程时查阅。

参考一:

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net; using System.Globalization; namespace FtpTest1
{ public class FtpWeb
{
string ftpServerIP;
string ftpRemotePath;
string ftpUserID;
string ftpPassword;
string ftpURI; /// <summary>
/// 连接FTP
/// </summary>
/// <param name="FtpServerIP">FTP连接地址</param>
/// <param name="FtpRemotePath">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="FtpUserID">用户名</param>
/// <param name="FtpPassword">密码</param>
public FtpWeb(string FtpServerIP, string FtpRemotePath, string FtpUserID, string FtpPassword)
{
ftpServerIP = FtpServerIP;
ftpRemotePath = FtpRemotePath;
ftpUserID = FtpUserID;
ftpPassword = FtpPassword;
ftpURI = "ftp://" + ftpServerIP + "/" ;
} static void Main() {
//string file = "c:\\aq3.gifa";
//FileInfo fileInf = new FileInfo(file);
//if (!fileInf.Exists)
//{
// Console.WriteLine(file + " no exists");
//}
//else {
// Console.WriteLine("yes");
//}
//Console.ReadLine();
FtpWeb fw = new FtpWeb("121.11.65.10", "", "aa1", "aa");
string[] filePaths = { "c:\\aq3.gif1", "c:\\aq2.gif1", "c:\\bsmain_runtime.log" };
Console.WriteLine(fw.UploadFile(filePaths));
Console.ReadLine();
} //上传文件
public string UploadFile( string[] filePaths ) {
StringBuilder sb = new StringBuilder();
if ( filePaths != null && filePaths.Length > ){
foreach( var file in filePaths ){
sb.Append(Upload( file )); }
}
return sb.ToString();
} /// <summary>
/// 上传文件
/// </summary>
/// <param name="filename"></param>
private string Upload(string filename)
{
FileInfo fileInf = new FileInfo(filename);
if ( !fileInf.Exists ){
return filename + " 不存在!\n";
} string uri = ftpURI + fileInf.Name;
FtpWebRequest reqFTP;
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.KeepAlive = false;
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
reqFTP.UseBinary = true;
reqFTP.UsePassive = false; //选择主动还是被动模式
//Entering Passive Mode
reqFTP.ContentLength = fileInf.Length;
int buffLength = ;
byte[] buff = new byte[buffLength];
int contentLen;
FileStream fs = fileInf.OpenRead();
try
{
Stream strm = reqFTP.GetRequestStream();
contentLen = fs.Read(buff, , buffLength);
while (contentLen != )
{
strm.Write(buff, , contentLen);
contentLen = fs.Read(buff, , buffLength);
}
strm.Close();
fs.Close();
}
catch (Exception ex)
{
return "同步 "+filename+"时连接不上服务器!\n";
//Insert_Standard_ErrorLog.Insert("FtpWeb", "Upload Error --> " + ex.Message);
}
return "";
} /// <summary>
/// 下载
/// </summary>
/// <param name="filePath"></param>
/// <param name="fileName"></param>
public void Download(string filePath, string fileName)
{
FtpWebRequest reqFTP;
try
{
FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create); reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + 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 = ;
int readCount;
byte[] buffer = new byte[bufferSize]; readCount = ftpStream.Read(buffer, , bufferSize);
while (readCount > )
{
outputStream.Write(buffer, , readCount);
readCount = ftpStream.Read(buffer, , bufferSize);
} ftpStream.Close();
outputStream.Close();
response.Close();
}
catch (Exception ex)
{
Insert_Standard_ErrorLog.Insert("FtpWeb", "Download Error --> " + ex.Message);
}
} /// <summary>
/// 删除文件
/// </summary>
/// <param name="fileName"></param>
public void Delete(string fileName)
{
try
{
string uri = ftpURI + fileName;
FtpWebRequest reqFTP;
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri)); reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.KeepAlive = false;
reqFTP.Method = WebRequestMethods.Ftp.DeleteFile; 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)
{
Insert_Standard_ErrorLog.Insert("FtpWeb", "Delete Error --> " + ex.Message + " 文件名:" + fileName);
}
} /// <summary>
/// 获取当前目录下明细(包含文件和文件夹)
/// </summary>
/// <returns></returns>
public string[] GetFilesDetailList()
{
string[] downloadFiles;
try
{
StringBuilder result = new StringBuilder();
FtpWebRequest ftp;
ftp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
ftp.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
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"), );
reader.Close();
response.Close();
return result.ToString().Split('\n');
}
catch (Exception ex)
{
downloadFiles = null;
Insert_Standard_ErrorLog.Insert("FtpWeb", "GetFilesDetailList Error --> " + ex.Message);
return downloadFiles;
}
} /// <summary>
/// 获取当前目录下文件列表(仅文件)
/// </summary>
/// <returns></returns>
public string[] GetFileList(string mask)
{
string[] downloadFiles;
StringBuilder result = new StringBuilder();
FtpWebRequest reqFTP;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI));
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)
{
if (mask.Trim() != string.Empty && mask.Trim() != "*.*")
{
string mask_ = mask.Substring(, mask.IndexOf("*"));
if (line.Substring(, mask_.Length) == mask_)
{
result.Append(line);
result.Append("\n");
}
}
else
{
result.Append(line);
result.Append("\n");
}
line = reader.ReadLine();
}
result.Remove(result.ToString().LastIndexOf('\n'), );
reader.Close();
response.Close();
return result.ToString().Split('\n');
}
catch (Exception ex)
{
downloadFiles = null;
if (ex.Message.Trim() != "远程服务器返回错误: (550) 文件不可用(例如,未找到文件,无法访问文件)。")
{
Insert_Standard_ErrorLog.Insert("FtpWeb", "GetFileList Error --> " + ex.Message.ToString());
}
return downloadFiles;
}
} /// <summary>
/// 获取当前目录下所有的文件夹列表(仅文件夹)
/// </summary>
/// <returns></returns>
public string[] GetDirectoryList()
{
string[] drectory = GetFilesDetailList();
string m = string.Empty;
foreach (string str in drectory)
{
if (str.Trim().Substring(, ).ToUpper() == "D")
{
m += str.Substring().Trim() + "\n";
}
} char[] n = new char[] { '\n' };
return m.Split(n);
} /// <summary>
/// 判断当前目录下指定的子目录是否存在
/// </summary>
/// <param name="RemoteDirectoryName">指定的目录名</param>
public bool DirectoryExist(string RemoteDirectoryName)
{
string[] dirList = GetDirectoryList();
foreach (string str in dirList)
{
if (str.Trim() == RemoteDirectoryName.Trim())
{
return true;
}
}
return false;
} /// <summary>
/// 判断当前目录下指定的文件是否存在
/// </summary>
/// <param name="RemoteFileName">远程文件名</param>
public bool FileExist(string RemoteFileName)
{
string[] fileList = GetFileList("*.*");
foreach (string str in fileList)
{
if (str.Trim() == RemoteFileName.Trim())
{
return true;
}
}
return false;
} /// <summary>
/// 创建文件夹
/// </summary>
/// <param name="dirName"></param>
public void MakeDir(string dirName)
{
FtpWebRequest reqFTP;
try
{
// dirName = name of the directory to create.
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + dirName));
reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream(); ftpStream.Close();
response.Close();
}
catch (Exception ex)
{
Insert_Standard_ErrorLog.Insert("FtpWeb", "MakeDir Error --> " + ex.Message);
}
} /// <summary>
/// 获取指定文件大小
/// </summary>
/// <param name="filename"></param>
/// <returns></returns>
public long GetFileSize(string filename)
{
FtpWebRequest reqFTP;
long fileSize = ;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + filename));
reqFTP.Method = WebRequestMethods.Ftp.GetFileSize;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
fileSize = response.ContentLength; ftpStream.Close();
response.Close();
}
catch (Exception ex)
{
Insert_Standard_ErrorLog.Insert("FtpWeb", "GetFileSize Error --> " + ex.Message);
}
return fileSize;
} /// <summary>
/// 改名
/// </summary>
/// <param name="currentFilename"></param>
/// <param name="newFilename"></param>
public void ReName(string currentFilename, string newFilename)
{
FtpWebRequest reqFTP;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpURI + currentFilename));
reqFTP.Method = WebRequestMethods.Ftp.Rename;
reqFTP.RenameTo = newFilename;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream(); ftpStream.Close();
response.Close();
}
catch (Exception ex)
{
Insert_Standard_ErrorLog.Insert("FtpWeb", "ReName Error --> " + ex.Message);
}
} /// <summary>
/// 移动文件
/// </summary>
/// <param name="currentFilename"></param>
/// <param name="newFilename"></param>
public void MovieFile(string currentFilename, string newDirectory)
{
ReName(currentFilename, newDirectory);
}

<--------------------------分割线------------------------->

参考二:

using System.IO;
using System.Net;
using System.Text;
using System.Diagnostics;
using System.Text.RegularExpressions; //从ftp上下载文件
private void Download(string filePath, string ImageSrc, string ImageName, string ftpServerIP, string ftpUserName, string ftpPwd)
{
if (!Directory.Exists(filePath))
{
Directory.CreateDirectory(filePath);
}
using (FileStream OutputStream = new FileStream(filePath + "\\" + ImageName, FileMode.Create))
{
FtpWebRequest ReqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + ImageSrc)); ReqFTP.Method = WebRequestMethods.Ftp.DownloadFile; ReqFTP.UseBinary = true; ReqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd); using (FtpWebResponse response = (FtpWebResponse)ReqFTP.GetResponse())
{ using (Stream FtpStream = response.GetResponseStream())
{ long Cl = response.ContentLength; int bufferSize = ; int readCount; byte[] buffer = new byte[bufferSize]; readCount = FtpStream.Read(buffer, , bufferSize); while (readCount > )
{
OutputStream.Write(buffer, , readCount); readCount = FtpStream.Read(buffer, , bufferSize);
} FtpStream.Close();
} response.Close(); } OutputStream.Close();
} }
//从服务器上传文件到FTP上
private void UploadSmall(string sFileDstPath, string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
{ FileInfo fileInf = new FileInfo(sFileDstPath); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName + "/" + fileInf.Name)); reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd); reqFTP.KeepAlive = false; reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.UseBinary = true; reqFTP.ContentLength = fileInf.Length; int buffLength = ; byte[] buff = new byte[buffLength]; int contentLen; using (FileStream fs = fileInf.OpenRead())
{ using (Stream strm = reqFTP.GetRequestStream())
{ contentLen = fs.Read(buff, , buffLength); while (contentLen != )
{ strm.Write(buff, , contentLen); contentLen = fs.Read(buff, , buffLength);
} strm.Close();
} fs.Close();
} }
//删除服务器上的文件
private void DeleteWebServerFile(string sFilePath)
{
if (File.Exists(sFilePath))
{
File.Delete(sFilePath);
}
}
//删除FTP上的文件
private void DeleteFtpFile(string[] IName, string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
{
foreach (string ImageName in IName)
{
string[] FileList = GetFileList(FolderName, ftpServerIP, ftpUserName, ftpPwd);
for (int i = ; i < FileList.Length; i++)
{
string Name = FileList[i].ToString();
if (Name == ImageName)
{
FtpWebRequest ReqFTP; ReqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName + "/" + ImageName)); ReqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd); ReqFTP.KeepAlive = false; ReqFTP.Method = WebRequestMethods.Ftp.DeleteFile; ReqFTP.UseBinary = true; using (FtpWebResponse Response = (FtpWebResponse)ReqFTP.GetResponse())
{ long size = Response.ContentLength; using (Stream datastream = Response.GetResponseStream())
{ using (StreamReader sr = new StreamReader(datastream))
{ sr.ReadToEnd(); sr.Close();
} datastream.Close();
} Response.Close();
}
}
} } }
//检查文件是否存在
public string[] GetFileList(string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
{
string[] downloadFiles; StringBuilder result = new StringBuilder(); FtpWebRequest reqFTP;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName + "/")); reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd); 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'), ); reader.Close(); response.Close(); return result.ToString().Split('\n');
}
catch (Exception ex)
{
downloadFiles = null;
return downloadFiles;
}
}
//从客户端上传文件到FTP上
private void UploadFtp(HttpPostedFile sFilePath, string filename, string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
{
//获取的服务器路径
//FileInfo fileInf = new FileInfo(sFilePath); FtpWebRequest reqFTP; reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName + "/" + filename)); reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd); reqFTP.KeepAlive = false; reqFTP.Method = WebRequestMethods.Ftp.UploadFile; reqFTP.UseBinary = true; reqFTP.ContentLength = sFilePath.ContentLength;
//设置缓存
int buffLength = ; byte[] buff = new byte[buffLength]; int contentLen; using (Stream fs = sFilePath.InputStream)
{ using (Stream strm = reqFTP.GetRequestStream())
{ contentLen = fs.Read(buff, , buffLength); while (contentLen != )
{ strm.Write(buff, , contentLen); contentLen = fs.Read(buff, , buffLength);
} strm.Close();
} fs.Close();
} }
//创建目录
private void CreateDirectory(string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
{
//创建日期目录
try
{
FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + FolderName)); reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd); reqFTP.KeepAlive = false; reqFTP.Method = WebRequestMethods.Ftp.MakeDirectory; FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
}
catch
{
ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('系统忙,请稍后再 试!');location.href=location.href;</script>");
}
}
//检查日期目录和文件是否存在
private static Regex regexName = new Regex(@"[^\s]*$", RegexOptions.Compiled);
private bool CheckFileOrPath(string FolderName, string ftpServerIP, string ftpUserName, string ftpPwd)
{
//检查一下日期目录是否存在
FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/")); reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserName, ftpPwd); reqFTP.Method = WebRequestMethods.Ftp.ListDirectoryDetails; Stream stream = reqFTP.GetResponse().GetResponseStream(); using (StreamReader sr = new StreamReader(stream))
{
string line = sr.ReadLine(); while (!string.IsNullOrEmpty(line))
{
GroupCollection gc = regexName.Match(line).Groups;
if (gc.Count != )
{
throw new ApplicationException("FTP 返回的字串格式不正确");
} string path = gc[].Value;
if (path == FolderName)
{
return true;
} line = sr.ReadLine();
}
} return false; }
}

<--------------------------分割线------------------------->

参考三:

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets; /// <summary>
/// FTPClient 的摘要说明。
/// </summary>
public class FTPClient
{
#region 构造函数
/// <summary>
/// 缺省构造函数
/// </summary>
public FTPClient()
{
strRemoteHost = "";
strRemotePath = "";
strRemoteUser = "";
strRemotePass = "";
strRemotePort = ;
bConnected = false;
} /// <summary>
/// 构造函数
/// </summary>
/// <param name="remoteHost"></param>
/// <param name="remotePath"></param>
/// <param name="remoteUser"></param>
/// <param name="remotePass"></param>
/// <param name="remotePort"></param>
public FTPClient(string remoteHost, string remotePath, string remoteUser, string remotePass, int remotePort)
{
strRemoteHost = remoteHost;
strRemotePath = remotePath;
strRemoteUser = remoteUser;
strRemotePass = remotePass;
strRemotePort = remotePort;
Connect();
}
#endregion
#region 登陆
/// <summary>
/// FTP服务器IP地址
/// </summary>
private string strRemoteHost;
public string RemoteHost
{
get
{
return strRemoteHost;
}
set
{
strRemoteHost = value;
}
}
/// <summary>
/// FTP服务器端口
/// </summary>
private int strRemotePort;
public int RemotePort
{
get
{
return strRemotePort;
}
set
{
strRemotePort = value;
}
}
/// <summary>
/// 当前服务器目录
/// </summary>
private string strRemotePath;
public string RemotePath
{
get
{
return strRemotePath;
}
set
{
strRemotePath = value;
}
}
/// <summary>
/// 登录用户账号
/// </summary>
private string strRemoteUser;
public string RemoteUser
{
set
{
strRemoteUser = value;
}
}
/// <summary>
/// 用户登录密码
/// </summary>
private string strRemotePass;
public string RemotePass
{
set
{
strRemotePass = value;
}
} /// <summary>
/// 是否登录
/// </summary>
private Boolean bConnected;
public bool Connected
{
get
{
return bConnected;
}
}
#endregion
#region 链接
/// <summary>
/// 建立连接
/// </summary>
public void Connect()
{
socketControl = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint ep = new IPEndPoint(IPAddress.Parse(RemoteHost), strRemotePort);
// 链接
try
{
socketControl.Connect(ep);
}
catch (Exception)
{
throw new IOException("Couldn't connect to remote server");
} // 获取应答码
ReadReply();
if (iReplyCode != )
{
DisConnect();
throw new IOException(strReply.Substring());
} // 登陆
SendCommand("USER " + strRemoteUser);
if (!(iReplyCode == || iReplyCode == ))
{
CloseSocketConnect();//关闭连接
throw new IOException(strReply.Substring());
}
if (iReplyCode != )
{
SendCommand("PASS " + strRemotePass);
if (!(iReplyCode == || iReplyCode == ))
{
CloseSocketConnect();//关闭连接
throw new IOException(strReply.Substring());
}
}
bConnected = true; // 切换到目录
ChDir(strRemotePath);
}
/// <summary>
/// 关闭连接
/// </summary>
public void DisConnect()
{
if (socketControl != null)
{
SendCommand("QUIT");
}
CloseSocketConnect();
}
#endregion
#region 传输模式 /// <summary>
/// 传输模式:二进制类型、ASCII类型
/// </summary>
public enum TransferType { Binary, ASCII }; /// <summary>
/// 设置传输模式
/// </summary>
/// <param name="ttType">传输模式</param>
public void SetTransferType(TransferType ttType)
{
if (ttType == TransferType.Binary)
{
SendCommand("TYPE I");//binary类型传输
}
else
{
SendCommand("TYPE A");//ASCII类型传输
}
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
else
{
trType = ttType;
}
}
/// <summary>
/// 获得传输模式
/// </summary>
/// <returns>传输模式</returns>
public TransferType GetTransferType()
{
return trType;
} #endregion
#region 文件操作
/// <summary>
/// 获得文件列表
/// </summary>
/// <param name="strMask">文件名的匹配字符串</param>
/// <returns></returns>
public string[] Dir(string strMask)
{
// 建立链接
if (!bConnected)
{
Connect();
} //建立进行数据连接的socket
Socket socketData = CreateDataSocket(); //传送命令
SendCommand("NLST " + strMask); //分析应答代码
if (!(iReplyCode == || iReplyCode == || iReplyCode == ))
{
throw new IOException(strReply.Substring());
} //获得结果
strMsg = "";
while (true)
{
int iBytes = socketData.Receive(buffer, buffer.Length, );
strMsg += ASCII.GetString(buffer, , iBytes);
if (iBytes < buffer.Length)
{
break;
}
}
char[] seperator = { '\n' };
string[] strsFileList = strMsg.Split(seperator);
socketData.Close();//数据socket关闭时也会有返回码
if (iReplyCode != )
{
ReadReply();
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
}
return strsFileList;
}
/// <summary>
/// 获取文件大小
/// </summary>
/// <param name="strFileName">文件名</param>
/// <returns>文件大小</returns>
private long GetFileSize(string strFileName)
{
if (!bConnected)
{
Connect();
}
SendCommand("SIZE " + Path.GetFileName(strFileName));
long lSize = ;
if (iReplyCode == )
{
lSize = Int64.Parse(strReply.Substring());
}
else
{
throw new IOException(strReply.Substring());
}
return lSize;
}
/// <summary>
/// 删除
/// </summary>
/// <param name="strFileName">待删除文件名</param>
public void Delete(string strFileName)
{
if (!bConnected)
{
Connect();
}
SendCommand("DELE " + strFileName);
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
}
/// <summary>
/// 重命名(如果新文件名与已有文件重名,将覆盖已有文件)
/// </summary>
/// <param name="strOldFileName">旧文件名</param>
/// <param name="strNewFileName">新文件名</param>
public void Rename(string strOldFileName, string strNewFileName)
{
if (!bConnected)
{
Connect();
}
SendCommand("RNFR " + strOldFileName);
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
// 如果新文件名与原有文件重名,将覆盖原有文件
SendCommand("RNTO " + strNewFileName);
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
}
#endregion
#region 上传和下载
/// <summary>
/// 下载一批文件
/// </summary>
/// <param name="strFileNameMask">文件名的匹配字符串</param>
/// <param name="strFolder">本地目录(不得以\结束)</param>
public void Get(string strFileNameMask, string strFolder)
{
if (!bConnected)
{
Connect();
}
string[] strFiles = Dir(strFileNameMask);
foreach (string strFile in strFiles)
{
if (!strFile.Equals(""))//一般来说strFiles的最后一个元素可能是空字符串
{
Get(strFile, strFolder, strFile);
}
}
}
/// <summary>
/// 下载一个文件
/// </summary>
/// <param name="strRemoteFileName">要下载的文件名</param>
/// <param name="strFolder">本地目录(不得以\结束)</param>
/// <param name="strLocalFileName">保存在本地时的文件名</param>
public void Get(string strRemoteFileName, string strFolder, string strLocalFileName)
{
if (!bConnected)
{
Connect();
}
SetTransferType(TransferType.Binary);
if (strLocalFileName.Equals(""))
{
strLocalFileName = strRemoteFileName;
}
if (!File.Exists(strLocalFileName))
{
Stream st = File.Create(strLocalFileName);
st.Close();
}
FileStream output = new
FileStream(strFolder + "\\" + strLocalFileName, FileMode.Create);
Socket socketData = CreateDataSocket();
SendCommand("RETR " + strRemoteFileName);
if (!(iReplyCode == || iReplyCode ==
|| iReplyCode == || iReplyCode == ))
{
throw new IOException(strReply.Substring());
}
while (true)
{
int iBytes = socketData.Receive(buffer, buffer.Length, );
output.Write(buffer, , iBytes);
if (iBytes <= )
{
break;
}
}
output.Close();
if (socketData.Connected)
{
socketData.Close();
}
if (!(iReplyCode == || iReplyCode == ))
{
ReadReply();
if (!(iReplyCode == || iReplyCode == ))
{
throw new IOException(strReply.Substring());
}
}
}
/// <summary>
/// 上传一批文件
/// </summary>
/// <param name="strFolder">本地目录(不得以\结束)</param>
/// <param name="strFileNameMask">文件名匹配字符(可以包含*和?)</param>
public void Put(string strFolder, string strFileNameMask)
{
string[] strFiles = Directory.GetFiles(strFolder, strFileNameMask);
foreach (string strFile in strFiles)
{
//strFile是完整的文件名(包含路径)
Put(strFile);
}
}
/// <summary>
/// 上传一个文件
/// </summary>
/// <param name="strFileName">本地文件名</param>
public void Put(string strFileName)
{
if (!bConnected)
{
Connect();
}
Socket socketData = CreateDataSocket();
SendCommand("STOR " + Path.GetFileName(strFileName));
if (!(iReplyCode == || iReplyCode == ))
{
throw new IOException(strReply.Substring());
}
FileStream input = new
FileStream(strFileName, FileMode.Open);
int iBytes = ;
while ((iBytes = input.Read(buffer, , buffer.Length)) > )
{
socketData.Send(buffer, iBytes, );
}
input.Close();
if (socketData.Connected)
{
socketData.Close();
}
if (!(iReplyCode == || iReplyCode == ))
{
ReadReply();
if (!(iReplyCode == || iReplyCode == ))
{
throw new IOException(strReply.Substring());
}
}
} #endregion
#region 目录操作
/// <summary>
/// 创建目录
/// </summary>
/// <param name="strDirName">目录名</param>
public void MkDir(string strDirName)
{
if (!bConnected)
{
Connect();
}
SendCommand("MKD " + strDirName);
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
} /// <summary>
/// 删除目录
/// </summary>
/// <param name="strDirName">目录名</param>
public void RmDir(string strDirName)
{
if (!bConnected)
{
Connect();
}
SendCommand("RMD " + strDirName);
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
} /// <summary>
/// 改变目录
/// </summary>
/// <param name="strDirName">新的工作目录名</param>
public void ChDir(string strDirName)
{
if (strDirName.Equals(".") || strDirName.Equals(""))
{
return;
}
if (!bConnected)
{
Connect();
}
SendCommand("CWD " + strDirName);
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
this.strRemotePath = strDirName;
} #endregion
#region 内部变量
/// <summary>
/// 服务器返回的应答信息(包含应答码)
/// </summary>
private string strMsg;
/// <summary>
/// 服务器返回的应答信息(包含应答码)
/// </summary>
private string strReply;
/// <summary>
/// 服务器返回的应答码
/// </summary>
private int iReplyCode;
/// <summary>
/// 进行控制连接的socket
/// </summary>
private Socket socketControl;
/// <summary>
/// 传输模式
/// </summary>
private TransferType trType;
/// <summary>
/// 接收和发送数据的缓冲区
/// </summary>
private static int BLOCK_SIZE = ;
Byte[] buffer = new Byte[BLOCK_SIZE];
/// <summary>
/// 编码方式
/// </summary>
Encoding ASCII = Encoding.ASCII;
#endregion
#region 内部函数
/// <summary>
/// 将一行应答字符串记录在strReply和strMsg
/// 应答码记录在iReplyCode
/// </summary>
private void ReadReply()
{
strMsg = "";
strReply = ReadLine();
iReplyCode = Int32.Parse(strReply.Substring(, ));
} /// <summary>
/// 建立进行数据连接的socket
/// </summary>
/// <returns>数据连接socket</returns>
private Socket CreateDataSocket()
{
SendCommand("PASV");
if (iReplyCode != )
{
throw new IOException(strReply.Substring());
}
int index1 = strReply.IndexOf('(');
int index2 = strReply.IndexOf(')');
string ipData =
strReply.Substring(index1 + , index2 - index1 - );
int[] parts = new int[];
int len = ipData.Length;
int partCount = ;
string buf = "";
for (int i = ; i < len && partCount <= ; i++)
{
char ch = Char.Parse(ipData.Substring(i, ));
if (Char.IsDigit(ch))
buf += ch;
else if (ch != ',')
{
throw new IOException("Malformed PASV strReply: " +
strReply);
}
if (ch == ',' || i + == len)
{
try
{
parts[partCount++] = Int32.Parse(buf);
buf = "";
}
catch (Exception)
{
throw new IOException("Malformed PASV strReply: " +
strReply);
}
}
}
string ipAddress = parts[] + "." + parts[] + "." +
parts[] + "." + parts[];
int port = (parts[] << ) + parts[];
Socket s = new
Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint ep = new
IPEndPoint(IPAddress.Parse(ipAddress), port);
try
{
s.Connect(ep);
}
catch (Exception)
{
throw new IOException("Can't connect to remote server");
}
return s;
}
/// <summary>
/// 关闭socket连接(用于登录以前)
/// </summary>
private void CloseSocketConnect()
{
if (socketControl != null)
{
socketControl.Close();
socketControl = null;
}
bConnected = false;
} /// <summary>
/// 读取Socket返回的所有字符串
/// </summary>
/// <returns>包含应答码的字符串行</returns>
private string ReadLine()
{
while (true)
{
int iBytes = socketControl.Receive(buffer, buffer.Length, );
strMsg += ASCII.GetString(buffer, , iBytes);
if (iBytes < buffer.Length)
{
break;
}
}
char[] seperator = { '\n' };
string[] mess = strMsg.Split(seperator);
if (strMsg.Length > )
{
strMsg = mess[mess.Length - ];
//seperator[0]是10,换行符是由13和0组成的,分隔后10后面虽没有字符串,
//但也会分配为空字符串给后面(也是最后一个)字符串数组,
//所以最后一个mess是没用的空字符串
//但为什么不直接取mess[0],因为只有最后一行字符串应答码与信息之间有空格
}
else
{
strMsg = mess[];
}
if (!strMsg.Substring(, ).Equals(" "))//返回字符串正确的是以应答码(如220开头,后面接一空格,再接问候字符串)
{
return ReadLine();
}
return strMsg;
}
/// <summary>
/// 发送命令并获取应答码和最后一行应答字符串
/// </summary>
/// <param name="strCommand">命令</param>
private void SendCommand(String strCommand)
{
//Byte[] cmdBytes =
// Encoding.ASCII.GetBytes((strCommand + "\r\n").ToCharArray());
byte[] cmdBytes = Encoding.GetEncoding("gb2312").GetBytes((strCommand + "\r\n").ToCharArray());
socketControl.Send(cmdBytes, cmdBytes.Length, );
ReadReply();
}
#endregion
}

<--------------------------分割线------------------------->

参考四:

介绍
微软的.net framework 2.0相对于1.x来说增加了对FTP的支持。以前为了符合我的需求,我不等不使用第三方类库来实现FTP功能,但是为了可靠,还是使用.net framework的类比较好。我的这段代码没有做成可重复使用的类库的形式,但它却是比较容易理解的并能满足你的需求。它可以实现上传,下载,删除等任意功能。在这篇文章的后面将给大家出示.net 2.0下实现ftp的简单代码,使用的语言是c#。或许是因为这是.net新增的类,又或许是第三方类库已经能很好的实现你的需求,.net 2.0的这部分类库并没有得到足够的关注。

背景
作为我的工作的一部分,我已经使用了ftp模块,但是我只能在.net 1.1中去使用它,所以我不能深入的研究.net 2.0下ftp的实现。但是我相信,.ne 2.0下对ftp的支持是非常好的。

代码
不要忘记引入命名空间

using System.Net;
using System.IO;

下面的几个步骤包括了使用FtpWebRequest类实现ftp功能的一般过程

1、创建一个FtpWebRequest对象,指向ftp服务器的uri
2、设置ftp的执行方法(上传,下载等)
3、给FtpWebRequest对象设置属性(是否支持ssl,是否使用二进制传输等)
4、设置登录验证(用户名,密码)
5、执行请求
6、接收相应流(如果需要的话)
7、如果没有打开的流,则关闭ftp请求

开发任何ftp应用程序都需要一个相关的ftp服务器及它的配置信息。FtpWebRequest暴露了一些属性来设置这些信息。
接下来的代码示例了上传功能
首先设置一个uri地址,包括路径和文件名。这个uri被使用在FtpWebRequest实例中。
然后根据ftp请求设置FtpWebRequest对象的属性
其中一些重要的属性如下:
    ·Credentials - 指定登录ftp服务器的用户名和密码。
    ·KeepAlive - 指定连接是应该关闭还是在请求完成之后关闭,默认为true
    ·UseBinary - 指定文件传输的类型。有两种文件传输模式,一种是Binary,另一种是ASCII。两种方法在传输时,字节的第8位是不同的。ASCII使用第8位作为错误控制,而Binary的8位都是有意义的。所以当你使用ASCII传输时要小心一些。简单的说,如果能用记事本读和写的文件用ASCII传输就是安全的,而其他的则必须使用Binary模式。当然使用Binary模式发送ASCII文件也是非常好的。
    ·UsePassive - 指定使用主动模式还是被动模式。早先所有客户端都使用主动模式,而且工作的很好,而现在因为客户端防火墙的存在,将会关闭一些端口,这样主动模式将会失败。在这种情况下就要使用被动模式,但是一些端口也可能被服务器的防火墙封掉。不过因为ftp服务器需要它的ftp服务连接到一定数量的客户端,所以他们总是支持被动模式的。这就是我们为什么要使用被动模式的原意,为了确保数据可以正确的传输,使用被动模式要明显优于主动模式。(译者注:主动(PORT)模式建立数据传输通道是由服务器端发起的,服务器使用20端口连接客户端的某一个大于1024的端口;在被动(PASV)模式中,数据传输的通道的建立是由FTP客户端发起的,他使用一个大于1024的端口连接服务器的1024以上的某一个端口)
    ·ContentLength - 设置这个属性对于ftp服务器是有用的,但是客户端不使用它,因为FtpWebRequest忽略这个属性,所以在这种情况下,该属性是无效的。但是如果我们设置了这个属性,ftp服务器将会提前预知文件的大小(在upload时会有这种情况)
    ·Method - 指定当前请求是什么命令(upload,download,filelist等)。这个值定义在结构体WebRequestMethods.Ftp中。

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 = ; 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, , buffLength); // 流内容没有结束
while (contentLen != )
{
// 把内容从file stream 写入 upload stream
strm.Write(buff, , contentLen); contentLen = fs.Read(buff, , buffLength);
} // 关闭两个流
strm.Close();
fs.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Upload Error");
}
}

以上代码简单的示例了ftp的上传功能。创建一个指向某ftp服务器的FtpWebRequest对象,然后设置其不同的属性Credentials,KeepAlive,Method,UseBinary,ContentLength。
打开本地机器上的文件,把其内容写入ftp请求流。缓冲的大小为2kb,无论上传大文件还是小文件,这都是一个合适的大小。

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 = ; int readCount; byte[] buffer = new byte[bufferSize]; readCount = ftpStream.Read(buffer, , bufferSize); while (readCount > )
{
outputStream.Write(buffer, , readCount); readCount = ftpStream.Read(buffer, , bufferSize);
} ftpStream.Close(); outputStream.Close(); response.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

上面的代码实现了从ftp服务器上下载文件的功能。这不同于之前所提到的上传功能,下载需要一个响应流,它包含着下载文件的内容。这个下载的文件是在FtpWebRequest对象中的uri指定的。在得到所请求的文件后,通过FtpWebRequest对象的GetResponse()方法下载文件。它将把文件作为一个流下载到你的客户端的机器上。

注意:我们可以设置文件在我们本地机器上的存放路径和名称。

public string[] GetFileList()
{
string[] downloadFiles;
StringBuilder result = new StringBuilder();
FtpWebRequest 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'), );
reader.Close();
response.Close();
return result.ToString().Split('\n');
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
downloadFiles = null;
return downloadFiles;
}
}

上面的代码示例了如何从ftp服务器上获得文件列表。uri指向ftp服务器的地址。我们使用StreamReader对象来存储一个流,文件名称列表通过“\r\n”分隔开,也就是说每一个文件名称都占一行。你可以使用StreamReader对象的ReadToEnd()方法来得到文件列表。上面的代码中我们用一个StringBuilder对象来保存文件名称,然后把结果通过分隔符分开后作为一个数组返回。我确定只是一个比较好的方法。

其他的实现如Rename,Delete,GetFileSize,FileListDetails,MakeDir等与上面的几段代码类似,就不多说了。

注意:实现重命名的功能时,要把新的名字设置给FtpWebRequest对象的RenameTo属性。连接指定目录的时候,需要在FtpWebRequest对象所使用的uri中指明。

需要注意的地方
你在编码时需要注意以下几点:
    ·除非EnableSsl属性被设置成true,否作所有数据,包括你的用户名和密码都将明文发给服务器,任何监视网络的人都可以获取到你连接服务器的验证信息。如果你连接的ftp服务器提供了SSL,你就应当把EnableSsl属性设置为true。
    ·如果你没有访问ftp服务器的权限,将会抛出SecurityException错误
    ·发送请求到ftp服务器需要调用GetResponse方法。当请求的操作完成后,一个FtpWebResponse对象将返回。这个FtpWebResponse对象提供了操作的状态和已经从ftp服务器上下载的数据。FtpWebResponse对象的StatusCode属性提供了ftp服务器返回的最后的状态代码。FtpWebResponse对象的StatusDescription属性为这个状态代码的描述。

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