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A session is an object associated with a visitor. Data can be put in the session and retrieved from it, much like a Hash table. A different set of data is kept for each visitor to the site.
Here is a set of pages that put a user's name in the session, and display it elsewhere. Try out installing and using these.
First write a form, let us call it DemoSession.html
DemoSession.html
كود:
<HTML>
<BODY>
<FORM METHOD=POST ACTION="DemoSession.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 "DemoSession.jsp", which saves the user's name in the session.
DemoSession.jsp
كود:
<%
   String name = request.getParameter( "username" );
   session.setAttribute( "theName", name );
%>
<HTML>
<BODY>
<A HREF="NextPage.jsp">Continue</A>
</BODY>
</HTML>



The DemoSession.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.
NextPage.jsp
كود:
<HTML>
<BODY>
Hello, <%= session.getAttribute( "theName" ) %>
</BODY>
</HTML>



The session is kept around until a timeout period. Then it is assumed that the user is no longer visiting the site, and the session is discarded.