The JSP implicit object ‘session’ is used to track user session between user requests.
| Name | Interface | Tomcat Implementation |
|---|---|---|
| session | javax.servlet.http.HttpSession | org.apache.catalina.session.StandardSessionFacade |
JSP implicit object ‘session’ example program (github)
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ourownjava.com</title>
</head>
<body>
<!-- jsp implicit object request example -->
Tomcat implementation of jsp implicit object s : <% out.println(session.getClass().getCanonicalName()); %> <br/>
<!-- how to add an attribute to session -->
<%session.setAttribute("who", "ourownjava.com"); %>
<!-- how to get an attribute from session -->
<%out.println(session.getAttribute("who"));%> <br/>
<!-- how to access servlet context using session object -->
<%session.getServletContext().setAttribute("attribute1", "attribute1Value"); %>
<%out.println(session.getServletContext().getAttribute("attribute1")); %>
</body>
</html>