June 2005
Beginner to intermediate
336 pages
6h 29m
English
Content preview from Java™ After Hours: 10 Projects You'll Never Do at WorkBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Using the Session and Application Objects
Online programs are by default stateless—that is, when you load a page a number of times in succession, the data in the page is reinitialized each time. If you want to track, say, the number of times the user has accessed the page, you need to specifically store that data somewhere.
In a standard desktop program, where you're interacting with the user while the program is running, you can store data in variables. That data won't be reset to its default values the next time you look at it. Using JSP sessions, you actually can do the same thing in JSP—you can interact with the user as part of a “session.”
While the session is active, you can store data in it, and that data will be preserved on the server ...
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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.