The ftp4j library implements a Java full-features FTP client.
EditBy: A glimpse of ftp4j key benefits:
Price, licence and support
Just a word: LGPL. The ftp4j library is 100% Free Software.
Connectivity
The ftp4j library can Connect the remote FTP server:
Through a direct TCP/IP connection.
Through a FTP proxy.
Tunnelling through a HTTP proxy.
Through a SOCKS 4/4a proxy.
Through a SOCKS 5 proxy.
You can add support to other proxies plugging your own connector, since the ftp4j connection manager architecture is modular.
Security
Basic FTP authentication.
FTPS (FTP over implicit TLS/SSL).
FTPES (FTP over explicit TLS/SSL).
Browsing the remote site
FTP LIST command support through extensible parser architecture. Bundled parsers can handle: UNIX style listing, MAC style, DOS style, NetWare style and variants, EPLF style. Moreover you can build your own parser and plug it in the library.
Clear object representation of directory contents.
Download and upload
Active and passive transfer mode support.
Binary and textual transfer type support, with optional and extensible type auto-selection.
Event-based transfer monitoring.
Transfer abortion support.
Transfer resume support.
Java exceptions
Structured exceptions let the developer know the real cause of any failure.

Version 1.5.1 - 2010/05/30

- REST command support compatibility enhanced.
- Blank lines coming from the server are now ignored. you can free download ftp4j 1.5.1 now.