.NET下的FTP上传，下载文件（支持中文名）
摘自：http://blog.iyunv.com/veryhappy/archive/2006/01/16/581072.aspx基本原理就是先建立Socket连接，然后发请求命令和取回应答码。编码方式采用Encoding ASCII = Encoding.Default;来支持中文文件名。
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.IO;
namespace Kostech.Net
{
///
/// FTP 的摘要说明。
///
public class FTP
{
private string strRemoteHost;
private int strRemotePort;
private string strRemotePath;
private string strRemoteUser;
private string strRemotePass;
private Boolean bConnected;
#region 内部变量
///
/// 服务器返回的应答信息(包含应答码)
///
private string strMsg;
///
/// 服务器返回的应答信息(包含应答码)
///
private string strReply;
///
/// 服务器返回的应答码
///
private int iReplyCode;
///
/// 进行控制连接的socket
///
private Socket socketControl;
///
/// 传输模式
///
private TransferType trType;
///
/// 传输模式:二进制类型、ASCII类型
///
public enum TransferType
{
///
/// Binary
///
Binary,
///
/// ASCII
///
ASCII
};
///
/// 接收和发送数据的缓冲区
///
private static int BLOCK_SIZE = 512;
Byte[] buffer = new Byte[ BLOCK_SIZE];
///
/// 编码方式
///
Encoding ASCII = Encoding.Default;
#endregion
#region 内部函数
#region 构造函数
///
/// 缺省构造函数
///
public FTP()
{
strRemoteHost= "";
strRemotePath= "";
strRemoteUser= "";
strRemotePass= "";
strRemotePort= 21;
bConnected = false;
}
///
/// 构造函数
///
///
///
///
///
///
public FTP( 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
///
/// FTP服务器IP地址
///
public string RemoteHost
{
get
{
return strRemoteHost;
}
set
{
strRemoteHost = value;
}
}
///
/// FTP服务器端口
///
public int RemotePort
{
get
{
return strRemotePort;
}
set
{
strRemotePort = value;
}
}
///
/// 当前服务器目录
///
public string RemotePath
{
get
{
return strRemotePath;
}
set
{
strRemotePath = value;
}
}
///
/// 登录用户账号
///
public string RemoteUser
{
set
{
strRemoteUser = value;
}
}
///
/// 用户登录密码
///
public string RemotePass
{
set
{
strRemotePass = value;
}
}
///
/// 是否登录
///
public bool Connected
{
get
{
return bConnected;
}
}
#endregion
#region 链接
///
/// 建立连接
///
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 != 220)
{
DisConnect();
throw new IOException(strReply.Substring(4));
}
// 登陆
SendCommand("USER "+strRemoteUser);
if( !(iReplyCode == 331 || iReplyCode == 230) )
{
CloseSocketConnect();//关闭连接
throw new IOException(strReply.Substring(4));
}
if( iReplyCode != 230 )
{
SendCommand("PASS "+strRemotePass);
if( !(iReplyCode == 230 || iReplyCode == 202) )
{
CloseSocketConnect();//关闭连接
throw new IOException(strReply.Substring(4));
}
}
bConnected = true;
// 切换到目录
ChDir(strRemotePath);
}
///
/// 关闭连接
///
public void DisConnect()
{
if( socketControl != null )
{
SendCommand("QUIT");
}
CloseSocketConnect();
}
#endregion
#region 传输模式
///
/// 设置传输模式
///
/// 传输模式
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 != 200)
{
throw new IOException(strReply.Substring(4));
}
else
{
trType = ttType;
}
}
///
/// 获得传输模式
///
/// 传输模式
public TransferType GetTransferType()
{
return trType;
}
#endregion
#region 文件操作
///
/// 获得文件列表
///
/// 文件名的匹配字符串
///
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 == 150 || iReplyCode == 125 || iReplyCode == 226))
{
throw new IOException(strReply.Substring(4));
}
//获得结果
strMsg = "";
while(true)
{
int iBytes = socketData.Receive(buffer, buffer.Length, 0);
strMsg += ASCII.GetString(buffer, 0, 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 != 226)
{
ReadReply();
if(iReplyCode != 226)
{
throw new IOException(strReply.Substring(4));
}
}
return strsFileList;
}
///
/// 获取文件大小
///
/// 文件名
/// 文件大小
private long GetFileSize(string strFileName)
{
if(!bConnected)
{
Connect();
}
SendCommand("SIZE " + Path.GetFileName(strFileName));
long lSize=0;
if(iReplyCode == 213)
{
lSize = Int64.Parse(strReply.Substring(4));
}
else
{
throw new IOException(strReply.Substring(4));
}
return lSize;
}
///
/// 删除
///
/// 待删除文件名
public void Delete(string strFileName)
{
if(!bConnected)
{
Connect();
}
SendCommand("DELE "+strFileName);
if(iReplyCode != 250)
{
throw new IOException(strReply.Substring(4));
}
}
///
/// 重命名(如果新文件名与已有文件重名,将覆盖已有文件)
///
/// 旧文件名
/// 新文件名
public void Rename(string strOldFileName,string strNewFileName)
{
if(!bConnected)
{
Connect();
}
SendCommand("RNFR "+strOldFileName);
if(iReplyCode != 350)
{
throw new IOException(strReply.Substring(4));
}
//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 != 250)
{
throw new IOException(strReply.Substring(4));
}
}
#endregion
#region 上传和下载
///
/// 下载一批文件
///
/// 文件名的匹配字符串
/// 本地目录(不得以\结束)
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);
}
}
}
///
/// 下载一个文件
///
/// 要下载的文件名
/// 本地目录(不得以\结束)
/// 保存在本地时的文件名
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 == 150 || iReplyCode == 125
|| iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}
while(true)
{
int iBytes = socketData.Receive(buffer, buffer.Length, 0);
output.Write(buffer,0,iBytes);
if(iBytes0)
{
socketData.Send(buffer, iBytes, 0);
}
input.Close();
if (socketData.Connected)
{
socketData.Close();
}
if(!(iReplyCode == 226 || iReplyCode == 250))
{
ReadReply();
if(!(iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}
}
}
#endregion
#region 目录操作
///
/// 创建目录
///
/// 目录名
public void MkDir(string strDirName)
{
if(!bConnected)
{
Connect();
}
SendCommand("MKD "+strDirName);
if(iReplyCode != 257)
{
throw new IOException(strReply.Substring(4));
}
}
///
/// 删除目录
///
/// 目录名
public void RmDir(string strDirName)
{
if(!bConnected)
{
Connect();
}
SendCommand("RMD "+strDirName);
if(iReplyCode != 250)
{
throw new IOException(strReply.Substring(4));
}
}
///
/// 改变目录
///
/// 新的工作目录名
public void ChDir(string strDirName)
{
if(strDirName.Equals(".") || strDirName.Equals(""))
{
return;
}
if(!bConnected)
{
Connect();
}
SendCommand("CWD "+strDirName);
if(iReplyCode != 250)
{
throw new IOException(strReply.Substring(4));
}
this.strRemotePath = strDirName;
}
#endregion
///
/// 将一行应答字符串记录在strReply和strMsg
/// 应答码记录在iReplyCode
///
private void ReadReply()
{
strMsg = "";
strReply = ReadLine();
iReplyCode = Int32.Parse(strReply.Substring(0,3));
}
///
/// 建立进行数据连接的socket
///
/// 数据连接socket
private Socket CreateDataSocket()
{
SendCommand("PASV");
if(iReplyCode != 227)
{
throw new IOException(strReply.Substring(4));
}
int index1 = strReply.IndexOf('(');
int index2 = strReply.IndexOf(')');
string ipData =
strReply.Substring(index1+1,index2-index1-1);
int[] parts = new int;
int len = ipData.Length;
int partCount = 0;
string buf="";
for (int i = 0; i < len && partCount
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