Java Glossary : FTP

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FTP

File Transfer Protocol. A protocol built on top of TCP/IP that lets you send or receive a file over the Internet. The url for a file has this form: ftp://username:password@hostname/pub/mydir. FTP works better than HTTP because it can pick up where it left off if the connection is broken. HTTP in theory has this feature as well, but it is more frequently implemented in FTP. If you simply want to download or copy a file, you can use HTTP which is faster and simpler.

Always use PASV mode, the newer style of FTP where the client sets up both the uplink and downlink. This is more secure than the old style when the server set up the downlink. Further, it is easier to tunnel through firewalls with PASV. The only time not to use it is if you have some very old server that does not support it.

If you are setting up an FTP server, you will have to tell your firewall/router to forward ports 20 and 21 for FTP and 2000..2010 for PASV to your FTP server.

If your FTP session aborts, the server may lock the file you were working until the session times out. The server can't tell the session was aborted. Until the timeout expires, you won't be able to update or rename that file in a new session.

Bruce Blackshaw's Java client ¤ David Rankin's free Java FTP client ¤ FileTransfer classes ¤ Fooware ¤ FTP Bean ¤ FTP server by Peter Sorotokin ¤ FTP Voyager ¤ IETF ¤ JScape ¤ Lamasoft ¤ Linlyn class: a pure Java implementation of the FTP protocol ¤ list sources ¤ Netload ¤ NetworksPlus ¤ remote file access ¤ RSYNC ¤ SAX

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