The JSP Files (part 6): State Of Grace (
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Now that you've mastered the basics, it's time to bring out the
big iron. This week, The JSP Files explores the various techniques
available to "maintain state" on a JSP-based Web site. Learn about the
Cookie and Session objects, find out how to build a cookie-based hit
counter, and read about a simple yet effective way of protecting sensitive
Web pages with the Session object.Over the past few weeks, you've learned a great deal about the various
control structures and objects available in JSP. You've see how to retrieve
information posted in an online form, and connect your JSP document to a
database for dynamic content generation.
This week in The JSP Files, we're going to tackle yet another very
interesting topic - the problem of maintaining "state" on a Web site. We'll
be looking at two common solutions to this problem - cookies and
server-based sessions - and using simple examples to illustrate the JSP
constructs available to help you identify and track client requests on your
Web site.
You'll also learn more than you want to know about what exactly
"maintaining state" actually means, the advantages and disadvantages of
each of the approaches just described...and, if we're doing our job right,
get a laugh or two out of the whole exercise.
