JSP Tracking

nhoj · #1 (**permalink**) 04-09-2007, 11:35 AM

I've always wanted to know more about JSP programming. How can I track sessions for JSP pages if the browser itself has disabled cookies?

Karpagarajan · #2 (**permalink**) 04-17-2007, 08:17 AM

A session is an object associated with a visitor. Data can be put in the session and retrieved from it, much like a Hashtable.

If you are programming the site, it is very helpful to be able to associate some data with each visitor. For this purpose, "session"s can be used in JSP.

Session variables have the following traits:

Unless specified otherwise, session variables expire 20 minutes after a visitor leaves the site.
Session variables will expire if no activity is detected on the site for 20 minutes by that specific site visitor, or if the visitor quits out of their web browser.
In order for session variables to work, the visitor's browser must be set to accept cookies.
The pages for the site all must be located within a single directory on the web server.
Information stored in session variables is site visitor specific. Different site visitors cannot access each other's session variable information.

Example

Use the session object like this...

<%
String name = request.getParameter( "username" );
session.setAttribute( "theName", name );
%>
<HTML>
<BODY>
<A HREF="NextPage.jsp">Continue</A>
</BODY>
</HTML>

I hope it will be useful for you.

thanks

prasannavigneshr · #3 (**permalink**) 04-17-2007, 11:27 PM

First we have a form, let us call it GetName.html

<HTML>
<BODY>
<FORM METHOD=POST ACTION="SaveName.jsp">
What's your name? <INPUT TYPE=TEXT NAME=username SIZE=20>
<P><INPUT TYPE=SUBMIT>
</FORM>
</BODY>
</HTML>
The target of the form is "SaveName.jsp", which saves the user's name in the session. Note the variable "session". This is another variable that is normally made available in JSPs, just like out and request variables. (In the @page directive, you can indicate that you do not need sessions, in which case the "session" variable will not be made available.)
<%
String name = request.getParameter( "username" );
session.setAttribute( "theName", name );
%>
<HTML>
<BODY>
<A HREF="NextPage.jsp">Continue</A>
</BODY>
</HTML>
The SaveName.jsp saves the user's name in the session, and puts a link to another page, NextPage.jsp.
NextPage.jsp shows how to retrieve the saved name.

<HTML>
<BODY>
Hello, <%= session.getAttribute( "theName" ) %>
</BODY>
</HTML>

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