NpsFtp class

NpsFtp used to run ftp command.
The sample code indicate how to download log file from www.jwebstar.com

var ftp = new NpsFtp();
ftp.Connect('www.jwebstar.com',21);
ftp.Login('nps','nps');
ftp.ChangeWorkingDirectory('/pub');
ftp.SetBinary();
ftp.MGet(new NpsFile('/jwebstarlog/'),'jwebstar*.log');
ftp.Disconnect();

Method Summary

	NpsFtp() Construction
void	Connect(String server,int port) throws Exception Connect to ftp server
void	Login(String uname,String upass) throws IOException Login to the FTP server using the provided username and password.
void	ChangeWorkingDirectory(String path) throws IOException Change the current working directory of the FTP session.
String	PrintWorkingDirectory() throws IOException Returns the pathname of the current working directory.
boolean	MkDir(String path) throws IOException Creates a new subdirectory on the FTP server in the current directory(if a relative pathname is given) or where specified (if an absolute pathname is given).
void	MkDirs(String path) throws IOException Creates the directory named by this abstract path, including any necessary but nonexistent parent directories.
boolean	RemoveDir(String path) throws IOException Removes a directory on the FTP server (if empty).
void	SetAscii() throws IOException Sets the file type to ASCII.
void	SetBinary() throws IOException Sets the file type to BINARY.The default file type is ASCII if this method is never called.
boolean	Get(String filename,NpsFile local) throws Exception Retrieves a file named filename from the server,and writes it to local.
void	MGet(NpsFile local_dir,String filter) throws Exception Retrieves files or directories from the server,and writes it to local dir. filter is the conditions, you can use the DOS format of the wildcard, * can replace the file name in the number of characters, and ? can only replace the file name of a character. for example:"*.doc" mean get all files ends with ".doc" from ftp server.
void	Put(NpsFile local) throws Exception Stores a file to the server.
void	MPut(NpsFile local_dir,String filter) throws Exception Stores all files or directories in local_dir to the server. filter is the conditions, you can use the DOS format of the wildcard, * can replace the file name in the number of characters, and ? can only replace the file name of a character. for example:"*.doc" mean put all files ends with ".doc" in local_dir to the ftp server
void	Delete(String filename) throws IOException Deletes a file on the FTP server.
boolean	Rename(String from,String to) throws IOException Renames a remote file.
void	Logout() throws IOException Logout of the FTP server by sending the QUIT command.
void	Disconnect() throws IOException Closes the connection to the FTP server and restores connection parameters to the default values.
void	Abort() throws IOException Abort a transfer in progress.