【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
{ ///
/// FTPClient 的摘要说明。
///
public class FTPClient
{
#region 构造函数
///
/// 缺省构造函数
///
public FTPClient()
{
strRemoteHost = " ";
strRemotePath = " ";
strRemoteUser = " ";
strRemotePass = " ";
strRemotePort = 21;
bConnected = false;
}
///
/// 构造函数
///
/// 远程主机名
/// 远程文件路径
/// 登录服务器用户名
/// 登录服务器密码
/// 登录服务器端口号
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
///
/// FTP服务器IP地址
///
private string strRemoteHost;
public string RemoteHost
{
get
{
return strRemoteHost;
}
set
{
strRemoteHost = value;
}
}
///
/// FTP服务器端口
///
private int strRemotePort;
public int RemotePort
{
get
{
return strRemotePort;
}
set
{
strRemotePort = value;
}
}
///
/// 当前服务器目录
///
private string strRemotePath;
public string RemotePath
{
get
{
return strRemotePath;
}
set
{
strRemotePath = value;
}
}
///
/// 登录用户账号
///
private string strRemoteUser;
public string RemoteUser
{
set
{
strRemoteUser = value;
}
}
///
/// 用户登录密码
///
private string strRemotePass;
public string RemotePass
{
set
{
strRemotePass = value;
}
} ///
/// 是否登录
///
private Boolean bConnected;
public bool Connected
{
get
{
return bConnected;
}
}
#endregion
#region 连接
///
/// 建立连接
///
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);
}
///
/// 关闭连接
///
public void DisConnect()
{
if (socketControl != null)
{
SendCommand("QUIT ");
}
CloseSocketConnect();
}
#endregion
#region 传输模式
///
/// 传输模式:二进制类型、ASCII类型
///
public enum TransferType { Binary, ASCII };
///
/// 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 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)
/// 返回true成功
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; }
}
///
/// 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
/// 返回true成功
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 (iBytes0)
{
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
///
/// 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;
///
/// 接收和发送数据的缓冲区
///
private static int BLOCK_SIZE = 512;
byte[] buffer = new byte;
///
/// 编码方式
///
Encoding ASCII = Encoding.ASCII;
#endregion
#region 内部函数
///
/// 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 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;
}
}
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