April 2002
Beginner to intermediate
1128 pages
26h 33m
English
book
Sams Teach Yourself J2EE™ in 21 Days
by Martin Bond, Dan Haywood, Debbie Law, Andy Longshaw, Peter Roxburgh
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Retaining Client and State Information
All but very simple Web applications are likely to require that information of some kind about the client be retained between different page requests. As has been stated, HTTP is stateless and does not provide a mechanism to ascertain that a series of requests have come from the same client.
There are a number of ways of retaining information about clients, such as hidden fields, cookies, and sessions (all described in this section). Sessions are by far the simplest to use, but you should be aware that no one method provides a perfect mechanism, and your servlet may need to be written to support more than one technique.
Using Session Objects
Sessions identify page requests that originate from the same browser ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.