/* Adapted from Listings * 19.26 `Simple example of session tracking' * and * 19.12 `ShowRequestHeaders.java' * Core Web Programming Java 2 Edition * By Marty Hall and Larry Brown * Published by Prentice Hall and Sun Microsystems Press, * . */ import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.net.*; import java.util.*; public class ShowSession extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); HttpSession session = request.getSession(true); Integer accessCount = (Integer)session.getAttribute("accessCount"); String heading; if (accessCount == null) { accessCount = new Integer(0); heading = "Welcome, Newcomer"; } else { heading = "Welcome Back"; accessCount = new Integer(accessCount.intValue() + 1); } session.setAttribute("accessCount", accessCount); out.println("\n" + "\n" + "\n"); out.println("\n" + " \n" + " Session Tracking With Servlets Example " + " for Dal CS 3172 : Web-centric Computing\n" + " \n" + " \n" + " \n" + "\n"); out.println("\n" + "

Web-centric Computing

\n" + "

Example: Session Tracking Servlet

\n"); out.println("

" + heading + "

\n" + "

Information on Your Session:

\n" + " \n" + " " + " " + " " + " \n" + " " + " " + " " + " \n" + " " + " " + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + " \n" + "
Info TypeValue
ID" + session.getId() + "
Creation Time" + new Date(session.getCreationTime()) + "
Time of Last Access" + new Date(session.getLastAccessedTime()) + "
Number of Previous Accesses" + accessCount + "
\n" + " MaxInactiveInterval" + " \n" + session.getMaxInactiveInterval() + " seconds
\n"); out.println("

[view source code]\n" + "

"); out.println("
\n" + "
\n" + "" + getScriptURI(request) + "\n" + "\n" + "
\n" + "
\n" + "
Version:
" + "
07 February 2007
" + "
CS 3172 Prof:
\n" + "
J. Blustein <jamie@cs.dal.ca>
\n" + "
\n\n" + "

\n" + " \n" + "

\n\n" + "

\n" + " Adapted from Listings 19.26 ShowSession.java " + " and \n19.12 ShowRequestHeaders.java" + " in Core Web Programming Java\n" + " (2nd ed.)" + " By Marty Hall and Larry Brown\n" + " Published by Prentice Hall and Sun Microsystems Press.\n" + "

\n"); out.println("\n"); } private String getScriptURI(HttpServletRequest request) throws ServletException { String Header = "SCRIPT_URI"; String scriptURIheader = request.getHeader(Header); if (null != scriptURIheader && !(scriptURIheader.equals("null"))) { return scriptURIheader; } else { String hostname = request.getHeader("host"); String URI = request.getRequestURI(); if (null != URI && null != hostname && request.getProtocol().startsWith("HTTP/")) { return "http://" + hostname + URI; } else { return ""; // empty string } } }// getScriptURI() /** Handle GET and POST requests identically. */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }// doPost() }