package hall; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.net.*; import java.util.*; /** Simple example of session tracking. See the shopping * cart example for a more detailed one. *

* Part of tutorial on servlets and JSP that appears at * http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/ * 1999 Marty Hall; may be freely used or adapted. */ public class ShowSession extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(true); response.setContentType("text/html"); PrintWriter out = response.getWriter(); String title = "Searching the Web"; String heading; Integer accessCount = new Integer(0);; if (session.isNew()) { heading = "Welcome, Newcomer"; } else { heading = "Welcome Back"; Integer oldAccessCount = // Use getAttribute, not getValue, in version // 2.2 of servlet API. (Integer)session.getValue("accessCount"); if (oldAccessCount != null) { accessCount = new Integer(oldAccessCount.intValue() + 1); } } // Use putAttribute in version 2.2 of servlet API. session.putValue("accessCount", accessCount); out.println(ServletUtilities.headWithTitle(title) + "\n" + "

" + heading + "

\n" + "

Information on Your Session:

\n" + "\n" + "\n" + " \n" + " \n" + " \n" + " \n" + "
Info TypeValue\n" + "
ID\n" + " " + session.getId() + "\n" + "
Creation Time\n" + " " + new Date(session.getCreationTime()) + "\n" + "
Time of Last Access\n" + " " + new Date(session.getLastAccessedTime()) + "\n" + "
Number of Previous Accesses\n" + " " + accessCount + "\n" + "
\n" + ""); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }