【转】WINFORM下FTP客户端的实现

第一种方法：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;

namespace Scan
{
class FtpUpLoadFiles
{ /// <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 = 21;
bConnected = false;
}

/// <summary>
/// 构造函数
/// </summary>
/// <param name= "remoteHost ">远程主机名 </param>
/// <param name= "remotePath ">远程文件路径 </param>
/// <param name= "remoteUser ">登录服务器用户名 </param>
/// <param name= "remotePass ">登录服务器密码 </param>
/// <param name= "remotePort ">登录服务器端口号 </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 登陆属性
/// <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 连接
/// <summary>
/// 建立连接
/// </summary>
public void Connect()
{
Socket socketControl = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint ep = new IPEndPoint(IPAddress.Parse(RemoteHost), strRemotePort);
// 连接
try
{
socketControl.Connect(ep);
}
catch (Exception)
{
throw new IOException("不能连接到远程服务器！");
}
// 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);
}
/// <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 != 200)
{
throw new IOException(strReply.Substring(4));
}
else
{
trType = ttType;
}
}
/// <summary>
/// 获得传输模式
/// </summary>
/// <returns> 传输模式 </returns>
public TransferType GetTransferType()
{
return trType;
}

#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>
/// <returns> 返回true成功 </returns>
public bool Get(string strFileNameMask, string strFolder)
{
try
{
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
{
if (!Get(strFile, strFolder, strFile)) return false;
}
}
return true;
}
catch { return false; }
}

/// <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>
/// <returns> 返回true成功 </returns>
public bool Get(string strRemoteFileName, string strFolder, string strLocalFileName)
{
try
{
if (!bConnected)
{
Connect();
}
long fsSize = 0;
FileStream fs;
SetTransferType(TransferType.Binary);
if (strLocalFileName.Equals(" "))
{
strLocalFileName = strRemoteFileName;
}

if (File.Exists(strFolder + "\\ " + strLocalFileName))
{
fs = File.OpenWrite(strFolder + "\\ " + strLocalFileName);
fsSize = fs.Length;
fs.Seek(fsSize, SeekOrigin.Current);
}
else
{
fs = new FileStream(strFolder + "\\ " + strLocalFileName, FileMode.Create);
fsSize = 0;
}

Socket socketData = CreateDataSocket();
SendCommand("RETR " + strRemoteFileName);

//125数据连接已打开，准备传送
//150文件状态良好，打开数据连接`
//226关闭数据连接，请求的文件x作成功
//250请求的文件x作完成
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);
fs.Write(buffer, 0, iBytes);
if (iBytes <= 0)
{
break;
}
}
fs.Close();

if (socketData.Connected)
{
socketData.Close();
}
//226关闭数据连接，请求的文件x作成功
//250请求的文件x作完成
if (!(iReplyCode == 226 || iReplyCode == 250))
{
ReadReply();
if (!(iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}
}
return true;
}
catch { return false; }
}

/// <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>
/// <returns> 返回true成功 </returns>
public bool Put(string strFolder, string strFileNameMask)
{
try
{
string[] strFiles = Directory.GetFiles(strFolder, strFileNameMask);
foreach (string strFile in strFiles)
{
//strFile是完整的文件名(包含路径)
if (!Put(strFile)) return false;
}
return true;
}
catch { return false; }
}

/// <summary>
/// 上传一个文件
/// </summary>
/// <param name= "strFileName "> 本地文件名 </param>
/// <returns> 返回true成功 </returns>
public bool Put(string strFileName)
{
try
{
if (!bConnected)
{
Connect();
}
//FileStream input;
//long readSize;
Socket socketData = CreateDataSocket();
SendCommand("STOR " + Path.GetFileName(strFileName));
//125数据连接已打开，准备传送
//150文件状态良好，打开数据连接`
if (!(iReplyCode == 125 || iReplyCode == 150))
{
throw new IOException(strReply.Substring(4));
}

FileStream input = new
FileStream(strFileName, FileMode.Open);

int iBytes = 0;
while ((iBytes = input.Read(buffer, 0, buffer.Length)) > 0)
{
socketData.Send(buffer, iBytes, 0);
}
input.Close();
if (socketData.Connected)
{
socketData.Close();
}
//226关闭数据连接，请求的文件x作成功
//250请求的文件x作完成
if (!(iReplyCode == 226 || iReplyCode == 250))
{
ReadReply();
if (!(iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}
}
return true;
}
catch { return false; }
}

#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 = 512;
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(0, 3));
}

/// <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 != 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[6];
int len = ipData.Length;
int partCount = 0;
string buf = " ";
for (int i = 0; i < len && partCount <= 6; i++)
{
char ch = Char.Parse(ipData.Substring(i, 1));
if (Char.IsDigit(ch))
buf += ch;
else if (ch != ',')
{
throw new IOException( "Malformed PASV strReply: " +
strReply);
}
if (ch == ',' || i + 1 == len)
{
try
{
parts[partCount++] = Int32.Parse(buf);
buf = " ";
}
catch (Exception)
{
throw new IOException( "Malformed PASV strReply: " +
strReply);
}
}
}
string ipAddress = parts[0] + ". " + parts[1] + "." +
parts[2] + ". " + parts[3];
int port = (parts[4]<< 8) + parts[5];
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( "不能链接到远程服务器！ ");
}
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, 0);
strMsg += ASCII.GetString(buffer, 0, iBytes);
if (iBytes < buffer.Length)
{
break;
}
}
char[] seperator = {'\n'};
string[] mess = strMsg.Split(seperator);
if (strMsg.Length > 2)
{
strMsg = mess[mess.Length - 2];
//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[0];
}
if (!strMsg.Substring(3, 1).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());
socketControl.Send(cmdBytes, cmdBytes.Length, 0);
ReadReply();
}
#endregion

}
}
}

第二种方法：

//ftp方式上传
public static int UploadFtp(string filePath, string filename, string ftpServerIP, string ftpUserID, string ftpPassword)
{

FileInfo fileInf = new FileInfo(filePath + "\\" + filename);
string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
FtpWebRequest reqFTP;

// Create FtpWebRequest object from the Uri provided
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));
try
{

// Provide the WebPermission Credintials
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

// By default KeepAlive is true, where the control connection is not closed
// after a command is executed.
reqFTP.KeepAlive = false;

// Specify the command to be executed.
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

// Specify the data transfer type.
reqFTP.UseBinary = true;

// Notify the server about the size of the uploaded file
reqFTP.ContentLength = fileInf.Length;

// The buffer size is set to 2kb
int buffLength = 2048;
byte[] buff = new byte[buffLength];
int contentLen;

// Opens a file stream (System.IO.FileStream) to read the file to be uploaded
//FileStream fs = fileInf.OpenRead();
FileStream fs = fileInf.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

// Stream to which the file to be upload is written
Stream strm = reqFTP.GetRequestStream();

// Read from the file stream 2kb at a time
contentLen = fs.Read(buff, 0, buffLength);

// Till Stream content ends
while (contentLen != 0)
{
// Write Content from the file stream to the FTP Upload Stream
strm.Write(buff, 0, contentLen);
contentLen = fs.Read(buff, 0, buffLength);
}

// Close the file stream and the Request Stream
strm.Close();
fs.Close();
return 0;
}
catch (Exception ex)
{
reqFTP.Abort();
Logging.WriteError(ex.Message + ex.StackTrace);
return -2;
}
}
//ftp方式下载
public static int DownloadFtp(string filePath, string fileName, string ftpServerIP, string ftpUserID, string ftpPassword)
{
FtpWebRequest reqFTP;
try
{
//filePath = <<The full path where the file is to be created.>>,
//fileName = <<Name of the file to be created(Need not be the name of the file on FTP server).>>
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 = 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();
return 0;
}
catch (Exception ex)
{
Logging.WriteError(ex.Message + ex.StackTrace);
return -2;
}
}