Sessions in a JSP
JSP - JavaServer Pages example from a Well House Consultants training course
More on JSP - JavaServer Pages [link]
Source code: counter.jsp Module: J907
This is an example that shows sessions in use within a JSP.
It's the simplest possible demo - a visit counter, but a
counter for the number of times that the current user has
visited during the current session.
/* Get value, or set to zero if this is a new session */
String val = (String) session.getAttribute("previouses");
if ( val == null ) val = "0";
/* Convert to number, increment, save back into session */
int n = Integer.parseInt(val);
/* Also pick up the hosts so that we can echo this in the
reply page (great for testing load balancer and sticky
session algorithms on our training courses! */
String hostipr = request.getRemoteHost();
String hostipl = request.getServerName();
/* ------------------------------------------------- */
<title>Sessions using a JSP</title>
<h1>Sessions in a JSP</h1>
This example program shows the use of a session within a
Java Server page (JSP). It's the simplest possible example,
counting the number of times that the user has visited in
the current session.<br /><br />
<b>Details from the session</b><br/>
Session: <%= session.getId()%><br/>
Generating or back end host: <%= hostipl %><br />
Accessing or front end host: <%= hostipr %><br />
Count: <%= n %><br/>
Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in Java
* Java Bootcamp
* Java Programming for the Web
Also available on on site courses for larger groups
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This example comes from our "JSP - JavaServer Pages" training module. You'll find a description of the topic and some other closely related examples on the "JSP - JavaServer Pages" module index page.
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