技术文章 > C#语言FTP客户端代码

C#语言FTP客户端代码

2018-11-15 09:59

文档管理软件,文档管理系统,知识管理系统,档案管理系统的技术资料:
[code]
csharp

/*
FTPFactory.cs
Better view with tab space=4
use the following line to compile
csc /target:library /out:FTPLib.dll /r:System.Net.DLL FTPFactory.cs
*/

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

namespace FtpLib
{

public class FTPFactory
{

private string remoteHost, remotePath, remoteUser, remotePass, mes;
private int remotePort, bytes;
private Socket clientSocket;

private int retValue;
private Boolean debug;
private Boolean logined;
private string reply;

private static int BLOCK_SIZE = 512;

Byte[] buffer = new Byte[BLOCK_SIZE];
Encoding ASCII = Encoding.ASCII;

public FTPFactory()
{

remoteHost = “localhost“;
remotePath = “.“;
remoteUser = “anonymous“;
remotePass = “ftpclient@ospreyindia.com“;
remotePort = 21;
debug = false;
logined = false;

}
public void setRemoteHost(string remoteHost)
{
this.remoteHost = remoteHost;
}
public string getRemoteHost()
{
return remoteHost;
}
public void setRemotePort(int remotePort)
{
this.remotePort = remotePort;
}
public int getRemotePort()
{
return remotePort;
}
public void setRemotePath(string remotePath)
{
this.remotePath = remotePath;
}
public string getRemotePath()
{
return remotePath;
}
public void setRemoteUser(string remoteUser)
{
this.remoteUser = remoteUser;
}
public void setRemotePass(string remotePass)
{
this.remotePass = remotePass;
}
public string[] getFileList(string mask)
{

if (!logined)
{
login();
}

Socket cSocket = createDataSocket();

sendCommand(“NLST “ + mask);

if (!(retValue == 150 || retValue == 125))
{
throw new IOException(reply.Substring(4));
}

mes = ““;

while (true)
{
int bytes = cSocket.Receive(buffer, buffer.Length, 0);
mes += ASCII.GetString(buffer, 0, bytes);
if (bytes < buffer.Length)
{
break;
}
}

char[] seperator = { “\n“ };
string[] mess = mes.Split(seperator);

cSocket.Close();

readReply();
if (retValue != 226)
{
throw new IOException(reply.Substring(4));
}
return mess;

}
public long getFileSize(string fileName)
{

if (!logined)
{
login();
}

sendCommand(“SIZE “ + fileName);
long size = 0;

if (retValue == 213)
{
size = reply.Substring(4).ToInt64();
}
else
{
throw new IOException(reply.Substring(4));
}
return size;

}
public void login()
{

clientSocket = new Socket(AddressFamily.AfINet, SocketType.SockStream, ProtocolType.ProtTCP);
IPEndPoint ep = new IPEndPoint(DNS.Resolve(remoteHost), remotePort);
int i = clientSocket.Connect(ep);
if (i != 0)
{
throw new IOException(“Couldn“t connect to remote server“);
}

readReply();
if (retValue != 220)
{
close();
throw new IOException(reply.Substring(4));
}
if (debug)
Console.WriteLine(“USER “ + remoteUser);
sendCommand(“USER “ + remoteUser);
if (!(retValue == 331 || retValue == 230))
{
cleanup();
throw new IOException(reply.Substring(4));
}
if (retValue != 230)
{
if (debug)
Console.WriteLine(“PASS xxx“);

sendCommand(“PASS “ + remotePass);
if (!(retValue == 230 || retValue == 202))
{
cleanup();
throw new IOException(reply.Substring(4));
}
}

logined = true;
Console.WriteLine(“Connected to “ + remoteHost);

chdir(remotePath);

}
public void setBinaryMode(Boolean mode)
{

if (mode)
{
sendCommand(“TYPE I“);
}
else
{
sendCommand(“TYPE A“);
}
if (retValue != 200)
{
throw new IOException(reply.Substring(4));
}
}
public void download(string fileName)
{
download(fileName, false);
}
public void download(string fileName, Boolean resume)
{


if (!logined)
{
login();
}

setBinaryMode(true);
long totalSize = 0;
try
{
totalSize = getFileSize(fileName);
}
catch (Exception)
{
throw new Exception(“File Not Found “ + fileName);
}


Console.WriteLine(“Downloading file “ + fileName + “ from “ + remoteHost + “/“ + remotePath);

if (!File.FileExists(fileName))
{
Stream st = File.Create(fileName);
st.Close();
}

FileStream output = new FileStream(fileName, FileMode.Open);

Socket cSocket = createDataSocket();

long offset = 0;

if (resume)
{

offset = output.Length;

if (offset > 0)
{
sendCommand(“REST “ + offset);
if (retValue != 350)
{
//throw new IOException(reply.Substring(4));
//Server may not support resuming.
offset = 0;
}
}

if (offset > 0)
{
if (debug)
{
Console.WriteLine(“seeking to “ + offset);
}
long npos = output.Seek(offset, SeekOrigin.Begin);
Console.WriteLine(“new pos=“ + npos);
}
}

sendCommand(“RETR “ + fileName);
if (!(retValue == 150 || retValue == 125))
{
throw new IOException(reply.Substring(4));
}

float iCnt = 0;
float per = 0, oldPer = 1;

while (true)
{

bytes = cSocket.Receive(buffer, buffer.Length, 0);
output.Write(buffer, 0, bytes);

// Showing the progress. 1..50
iCnt += bytes;
per = (int)((iCnt / totalSize) * 100);
if (per != oldPer && per % 2 == 0)
{
Console.Write(“.“);
oldPer = per;
}

if (bytes < buffer.Length)
{
break;
}
}

output.Close();
cSocket.Close();
Console.WriteLine(““);

readReply();

if (!(retValue == 226 || retValue == 250))
{
throw new IOException(reply.Substring(4));
}

}
public void upload(string fileName)
{
upload(fileName, false);
}
public void upload(string fileName, Boolean resume)
{

if (!logined)
{
login();
}

Socket cSocket = createDataSocket();
long offset = 0;

if (resume)
{

try
{

setBinaryMode(true);
offset = getFileSize(fileName);

}
catch (Exception)
{
offset = 0;
}
}

if (offset > 0)
{
sendCommand(“REST “ + offset);
if (retValue != 350)
{
//throw new IOException(reply.Substring(4));
//Remote server may not support resuming.
offset = 0;
}
}

sendCommand(“STOR “ + fileName);
if (!(retValue == 125 || retValue == 150))
{
throw new IOException(reply.Substring(4));
}

// open input stream to read source file
FileStream input = new FileStream(fileName, FileMode.Open);

if (offset != 0)
{

if (debug)
{
Console.WriteLine(“seeking to “ + offset);
}
input.Seek(offset, SeekOrigin.Begin);
}

//for progress bar
long totalSize = input.Length - offset;
float iCnt = 0;
int per = 0, oldPer = 1;
Console.WriteLine(“Uploading file “ + fileName + “ to “ + remotePath);

while ((bytes = input.Read(buffer, 0, buffer.Length)) > 0)
{

cSocket.Send(buffer, bytes, 0);

// Showing the progress. 1..50
iCnt += bytes;
per = (int)((iCnt / totalSize) * 100);
if (per != oldPer && per % 2 == 0)
{
Console.Write(“.“);
oldPer = per;
}
}
input.Close();

Console.WriteLine(““);

cSocket.Close();

readReply();
if (!(retValue == 226 || retValue == 250))
{
throw new IOException(reply.Substring(4));
}
}
public void deleteRemoteFile(string fileName)
{

if (!logined)
{
login();
}

sendCommand(“DELE “ + fileName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}
public void renameRemoteFile(string oldFileName, string newFileName)
{

if (!logined)
{
login();
}

sendCommand(“RNFR “ + oldFileName);

if (retValue != 350)
{
throw new IOException(reply.Substring(4));
}

// known problem
// rnto will not take care of existing file.
// i.e. It will overwrite if newFileName exist
sendCommand(“RNTO “ + newFileName);
if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}
}

public void mkdir(string dirName)
{

if (!logined)
{
login();
}

sendCommand(“MKD “ + dirName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

public void rmdir(string dirName)
{

if (!logined)
{
login();
}

sendCommand(“RMD “ + dirName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

}

public void chdir(string dirName)
{
if (dirName.Equals(“.“))
{
return;
}

if (!logined)
{
login();
}

sendCommand(“CWD “ + dirName);

if (retValue != 250)
{
throw new IOException(reply.Substring(4));
}

this.remotePath = dirName;

Console.WriteLine(“Current directory is “ + remotePath);

}

public void close()
{
if (clientSocket != null)
{
sendCommand(“QUIT“);
}
cleanup();
Console.WriteLine(“Closing...“);
}

public void setDebug(Boolean debug)
{
this.debug = debug;
}

private void readReply()
{
mes = ““;
reply = readLine();
retValue = reply.Substring(0, 3).ToInt32();
}

private void cleanup()
{
if (clientSocket != null)
{
clientSocket.Close();
clientSocket = null;
}
logined = false;
}

private string readLine()
{

while (true)
{
bytes = clientSocket.Receive(buffer, buffer.Length, 0);
mes += ASCII.GetString(buffer, 0, bytes);
if (bytes < buffer.Length)
{
break;
}
}

char[] seperator = { “\n“ };
string[] mess = mes.Split(seperator);
if (mes.Length > 2)
{
mes = mess[mess.Length - 2];
}
else
{
mes = mess[0];
}
if (!mes.Substring(3, 1).Equals(“ “))
{
return readLine();
}
if (debug)
{
for (int k = 0; k < mess.Length - 1; k++)
{
Console.WriteLine(mess[k]);
}
}
return mes;
}

private void sendCommand(String command)
{
Byte[] cmdBytes = Encoding.ASCII.GetBytes((command + “\r\n“).ToCharArray());
clientSocket.Send(cmdBytes, cmdBytes.Length, 0);
readReply();
}

private Socket createDataSocket()
{

sendCommand(“PASV“);

if (retValue != 227)
{
throw new IOException(reply.Substring(4));
}

int index1 = reply.IndexOf(“(“);
int index2 = reply.IndexOf(“)“);
string ipData = reply.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 = ipData.Substring(i, 1).ToChar();
if (Char.IsDigit(ch))
buf += ch;
else if (ch != “,“)
{
throw new IOException(“Malformed PASV reply: “ + reply);
}

if (ch == “,“ || i + 1 == len)
{
try
{
parts[partCount++] = buf.ToInt32();
buf = ““;
}
catch (Exception)
{
throw new IOException(“Malformed PASV reply: “ + reply);
}
}
}

string ipAddress = parts[0] + “.“ + parts[1] + “.“ +
parts[2] + “.“ + parts[3];

int port = (parts[4] << 8) + parts[5];

Socket s = new Socket(AddressFamily.AfINet, SocketType.SockStream, ProtocolType.ProtTCP);
IPEndPoint ep = new IPEndPoint(DNS.Resolve(ipAddress), port);

int sucess = s.Connect(ep);

if (sucess != 0)
{
throw new IOException(“Can“t connect to remote server“);
}

return s;
}

}
}
[/code]

[code]
csharp
/*

File : Test.cs
Better view with tab space=4
use the following line to compile
csc.exe /t:exe /r:System.DLL /r:System.Net.DLL /r:FTPLib.dll /out:“Test.exe“ “Test.cs“

*/
using System;
using FtpLib;

public class Test
{

public static void Main()
{

try
{

Console.WriteLine(“Starting...“);

FTPFactory ff = new FTPFactory();
ff.setDebug(true);
ff.setRemoteHost(“192.168.10.19“);
ff.setRemoteUser(“jaimon“);
ff.setRemotePass(“mathew“);
ff.login();

string[] fileNames = ff.getFileList(“*.*“);
for (int i = 0; i < fileNames.Length; i++)
{
Console.WriteLine(fileNames[i]);
}
ff.download(“Readme.zip“, true);
ff.close();

}
catch (Exception e)
{
Console.WriteLine(“Caught Error :“ + e.Message);
}
}
}
[/code]