The source code of MaintainSessionPong.java:
<![CDATA[
import java.io.* ;
import javax.servlet.* ;
import javax.servlet.http.* ;
import java.util.* ; // for Date
public class MaintainSessionPong extends HttpServlet {
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException,
ServletException {
doGet(request,response) ;
} //doPost
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException,
ServletException {
response.setContentType("text/html") ;
PrintWriter out = response.getWriter() ;
Furniture.doHeader(out,"Maintain a session (Pong)") ;
out.println("The session time-out is set to 60 seconds") ;
HttpSession session = request.getSession() ; // Will create new session if none exists
Integer accessCount = (Integer)session.getAttribute("accessCount") ;
if (accessCount == null) {
accessCount = new Integer(1) ;
session.setMaxInactiveInterval(60) ;
out.println("<p>Session starts:") ;
}
else {
accessCount = new Integer(accessCount.intValue()+1) ;
out.println("<p>Session continues:") ;
}
session.setAttribute("accessCount",accessCount) ;
out.println("<p>Session ID : " + session.getId()) ;
out.println("<br>Creation time : " + new Date(session.getCreationTime())) ;
if (accessCount.intValue() > 1) {
out.println("<br>Last access time : " + new Date(session.getLastAccessedTime())) ;
out.println("<br>Number of accesses : " + accessCount) ;
}
// Now pass Ping's URL though encodeURL (to add URL rewriting for the session if necessary)
String partnerURL = "MaintainSessionPing" ;
String encoded = response.encodeURL(partnerURL) ;
out.println("<p>Click <a href=\""
+ encoded
+"\">here</a> for Ping") ;
// and Kill's URL
partnerURL = "MaintainSessionKill" ;
encoded = response.encodeURL(partnerURL) ;
out.println("<p>Click <a href=\""
+ encoded
+"\">here</a> to kill the session") ;
Furniture.doFooter(out) ;
} // doGet
} // class
]]>