c#上传下载ftp(支持断点续传)

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;

namespace ftpGet
{
/**////
/// FTP Client
///
public class FTPClient
{
构造函数#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
///
/// FTP服务器IP地址
/// 当前服务器目录
/// 登录用户账号
/// 登录用户密码
/// FTP服务器端口
public FTPClient(string remoteHost, string remotePath, string remoteUser, string remotePass, int remotePort)
{
strRemoteHost = remoteHost;
strRemotePath = remotePath;
strRemoteUser = remoteUser;
strRemotePass = remotePass;
strRemotePort = remotePort;
Connect();
}
#endregion

登陆字段、属性#region 登陆字段、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

链接#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;

// 切换到初始目录
if (!string.IsNullOrEmpty(strRemotePath))
{
ChDir(strRemotePath);
}
}

/**////
/// 关闭连接
///
public void DisConnect()
{
if (socketControl != null)
{
SendCommand("QUIT");
}
CloseSocketConnect();
}

#endregion

传输模式#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

文件操作#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("LIST " + 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 += GB2312.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
public 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

上传和下载#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
{
if (strFile.LastIndexOf(".") > -1)
{
Get(strFile.Replace("/r", ""), strFolder, strFile.Replace("/r", ""));
}
}
}
}

/**////
/// 下载目录
///
/// 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 (strLocalFileName.StartsWith("-r"))
{
string[] infos = strLocalFileName.Split(' ');
strRemoteFileName=strLocalFileName = infos[infos.Length - 1];

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 (iBytes <= 0)
{
break;
}
}
output.Close();
if (socketData.Connected)
{
socketData.Close();
}
if (!(iReplyCode == 226 || iReplyCode == 250))
{
ReadReply();
if (!(iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}
}
}
}

/**////
/// 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 GetFile(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 (iBytes <= 0)
{
break;
}
}
output.Close();
if (socketData.Connected)
{
socketData.Close();
}
if (!(iReplyCode == 226 || iReplyCode == 250))
{
ReadReply();
if (!(iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}
}
}

/**////
/// 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 GetBrokenFile(string strRemoteFileName, string strFolder, string strLocalFileName,long size)
{
if (!bConnected)
{
Connect();
}
SetTransferType(TransferType.Binary);

FileStream output = new
FileStream(strFolder + "//" + strLocalFileName, FileMode.Append);
Socket socketData = CreateDataSocket();
SendCommand("REST " + size.ToString());
SendCommand("RETR " + strRemoteFileName);
if (!(iReplyCode == 150 || iReplyCode == 125
|| iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}

//int byteYu = (int)size % 512;
//int byteChu = (int)size / 512;
//byte[] tempBuffer = new byte[byteYu];
//for (int i = 0; i < byteChu; i++)
//{
// socketData.Receive(buffer, buffer.Length, 0);
//}
//socketData.Receive(tempBuffer, tempBuffer.Length, 0);

//socketData.Receive(buffer, byteYu, 0);
while (true)
{
int iBytes = socketData.Receive(buffer, buffer.Length, 0);
//totalBytes += iBytes;
output.Write(buffer, 0, iBytes);
if (iBytes <= 0)
{
break;
}
}
output.Close();
if (socketData.Connected)
{
socketData.Close();
}
if (!(iReplyCode == 226 || iReplyCode == 250))
{
ReadReply();
if (!(iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}
}
}

/**////
/// 上传一批文件
///
/// 本地目录(不得以/结束)
/// 文件名匹配字符(可以包含*和?)
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);
}
}

/**////
/// 上传一个文件
///
/// 本地文件名
public void Put(string strFileName)
{
if (!bConnected)
{
Connect();
}
Socket socketData = CreateDataSocket();
SendCommand("STOR " + Path.GetFileName(strFileName));
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();
}
if (!(iReplyCode == 226 || iReplyCode == 250))
{
ReadReply();
if (!(iReplyCode == 226 || iReplyCode == 250))
{
throw new IOException(strReply.Substring(4));
}
}
}

#endregion

目录操作#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

内部变量#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[BLOCK_SIZE];
/**////
/// 编码方式(为防止出现中文乱码采用 GB2312编码方式)
///
Encoding GB2312 = Encoding.GetEncoding("gb2312");
#endregion

内部函数#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[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("Can't connect to remote server");
}
return s;
}

/**////
/// 关闭socket连接(用于登录以前)
///
private void CloseSocketConnect()
{
if (socketControl != null)
{
socketControl.Close();
socketControl = null;
}
bConnected = false;
}

/**////
/// 读取Socket返回的所有字符串
///
/// 包含应答码的字符串行
private string ReadLine()
{
while (true)
{
int iBytes = socketControl.Receive(buffer, buffer.Length, 0);
strMsg += GB2312.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;
}

/**////
/// 发送命令并获取应答码和最后一行应答字符串
///
/// 命令
private void SendCommand(String strCommand)
{
Byte[] cmdBytes =
GB2312.GetBytes((strCommand + "/r/n").ToCharArray());
socketControl.Send(cmdBytes, cmdBytes.Length, 0);
ReadReply();
}

#endregion
}
}

当然，大家还要看看Main方法 using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace ftpGet
{
class Program
{
static string remotingFolder = System.Configuration.ConfigurationSettings.AppSettings["remotingFolder"]; //远程ftp文件目录
static string localFolder = System.Configuration.ConfigurationSettings.AppSettings["localFolder"]; //要下载到的本地目录
static string ftpServer = System.Configuration.ConfigurationSettings.AppSettings["ftpServer"]; //ftp服务器
static string user = System.Configuration.ConfigurationSettings.AppSettings["user"]; //用户名
static string pwd = System.Configuration.ConfigurationSettings.AppSettings["pwd"]; //密码
static string port = System.Configuration.ConfigurationSettings.AppSettings["port"]; //端口
static void Main(string[] args)
{
FTPClient client = new FTPClient(ftpServer, "/", user, pwd, int.Parse(port));
client.Connect();
GetFolder("*", remotingFolder, client, CreateFolder());
client.DisConnect();
ClearFolder();
Console.WriteLine("下载完毕");
System.Threading.Thread.Sleep(3000);
}

/**////
/// 在本地目录下创建一个以日期为名称的目录，我做这个ftp的主要目的是为了每天都备份
///
/// 创建的目录名
private static string CreateFolder()
{
string folder=localFolder + "//"+DateTime.Now.ToShortDateString();
if (!Directory.Exists(folder))
Directory.CreateDirectory(folder);
return folder;
}

/**////
/// 在下载结束后清空程序目录的多余文件
///
private static void ClearFolder()
{
string folder = Environment.CurrentDirectory;
string[] dictorys = Directory.GetFiles(folder);
foreach (string dictory in dictorys)
{
FileInfo info = new FileInfo(dictory);
if (info.Length == 0)
File.Delete(dictory);
}
}

/**////
/// 递归获取ftp文件夹的内容
///
/// 文件标记
/// 远程路径
///
///
private static void GetFolder(string fileMark, string path, FTPClient client, string folder)
{
string[] dirs = client.Dir(path); //获取目录下的内容
client.ChDir(path); //改变目录
foreach (string dir in dirs)
{
string[] infos = dir.Split(' ');
string info = infos[infos.Length - 1].Replace("/r", "");
if (dir.StartsWith("d") && !string.IsNullOrEmpty(dir)) //为目录
{

if (!info.EndsWith(".") && !info.EndsWith("..")) //筛选出真实的目录
{
Directory.CreateDirectory(folder + "//" + info);
GetFolder(fileMark, path + "/" + info, client, folder + "//" + info);
client.ChDir(path);
}
}
else if (dir.StartsWith("-r")) //为文件
{
string file = folder + "//" + info;
if (File.Exists(file))
{
long remotingSize = client.GetFileSize(info);
FileInfo fileInfo = new FileInfo(file);
long localSize = fileInfo.Length;

if (remotingSize != localSize) //短点续传
{
client.GetBrokenFile(info, folder, info, localSize);
}
}
else
{
client.GetFile(info, folder, info); //下载文件
Console.WriteLine("文件" + folder + info + "已经下载");
}
}
}

}
}
}