Hi,
Thanks a lot Nic.
I stand corrected and more enlightened.
regds,
Gokul
> >But you can definately extend Generic servlet to handle
> >ftp requests, in theory at least.
> >I have never done this. Anyone else who can share some
> >examples/Implementation of this.
>
> It was originally thought that the servlet API would provide a basis
> for implementations of nearlly all internet TCP based protocols. In
> fact only one other than HTTP has ever been done, an SMTP
> implementation by the Apache project called James.
>
> Head over to http://java.apache.org/ for more information on James.
>
>
> The servlet API has not mushroomed into other implementations because
> of it's peculiarly HTTP architecture. The API has a concept of a
> Request and Response (at the lowest level since this is how
> javax.servlet.Servlet looks). Most internet protocols don't work like
> that... most work on a session basis, including FTP.
>
> What that means is that processing HTTP is thought of like this:
>
> open connection
> send request
> process
> send response
> close connection
> open connection
> send request
> .
> .
> .
>
> whereas processing FTP or SMTP or IMAP is thought of like this:
>
> open connection
> send request "1"
> process
> send response
> send request "2"
> process
> send response
> .
> .
> .
> close connection
>
> For example in FTP one uses the command "cd" to change to a
> directory, all subsequent command operate within that directory...
> within HTTP that is impossible since there is no concept of a
> session.
>
>
> So, in the end, it is widely felt that the servlet API is just not
> much use for protocols other than HTTP.
>
> Even the Apache project hasn't pushed James - their SMTP
> implementation.
>
>
> Nic Ferrier
>
>
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