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From "Craig R. McClanahan" <>
Subject Re: Limits on the size of the web.xml file?
Date Mon, 03 Sep 2001 20:08:31 GMT

On Mon, 3 Sep 2001, Roland wrote:

> Date: Mon, 3 Sep 2001 16:37:17 -0300
> From: Roland <>
> Reply-To:
> To:
> Subject: Re: Limits on the size of the web.xml file?
> > The details *vastly* depend on how your app is put together, but it isn't
> > all that complicated to figure out.
> >
> > Consider that you might have the mailboxes for a particular user defined
> > in a database table called "mailboxes", with columns "username" and
> > "mailboxname".  It would be easy to construct an SQL statement like this:
> >
> >   select mailboxname from mailboxes
> >     where username = xxx
> Ok, having Data in the database is fine. But what if we also have image
> data? We will store Charts and things like that. I think it would be easier
> to create a directory for each user(maybe I'm wrong). It is possible to
> store images in a mysql database but I think its not as easy as text data.
> And then we will have to create a HTML page from that image data and send it
> to the user.

Storing binary data in the database isn't all that hard.  Then, all you'd
need to do is create a servlet mapped to "*.gif", "*.jpg", and so on that
did the user identity check before serving the contents (in binary).  The
same basic principle would work for data stored in per-user directories.
In essence, you're replacing the default file-serving servlet that comes
with Tomcat.

If you run under Tomcat 4 (which supports Servlet 2.3), you also have
another choice -- you can implement your custom authentication checker as
a Filter instead of a Servlet.  That way, you can apply your own custom
check onto any path, without having to modify or replace the file-serving
servlet that comes with Tomcat.


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