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Session Tracker Servlet

 

JSP Page:index.jsp

<%-- 
    Document   : index
    Created on : Feb 28, 2012, 3:32:07 PM
    Author     : dell_pc
--%>
<%@page contentType="text/html" 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>JSP Page</title>
    </head>
    <body>
        <h1>Access Servlet by servlet's Name!</h1>
        
        <a href="SessionTrackerServlet">SessionTrackerServlet</a><br>
        <a href="enumerationServlet">enumerationServlet</a><br>
    </body>
</html>
 
 
 
Servlet:SessionTrackerServlet.java
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
 *
 * @author dell_pc
 */
public class SessionTrackerServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
/* TODO output your page here */
out.println("<html>");
out.println("<head>");
out.println("<title>" + getServletInfo() + "</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet SessionTrackerServlet at " + request.getContextPath() + "</h1>");
out.println(" <form name=\"form\" action=\"SessionTrackerServlet\" method=\"POST\">");
out.println("<BR><input type=\"submit\" value=\"Session Tracker \" />");
out.println("</form>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
    @Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
    @Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
/*
 * Get the no. of time access this page, and store value into
 * client's session under the name session.active
 */
HttpSession session = request.getSession();
String string;
Integer count;
synchronized (session) {
count = (Integer) session.getAttribute("session.active");
if (count == null) {
count = new Integer(1);
string = "Welcome User";
} else {
count = new Integer((count.intValue()) + 1);
string = "Welcome Back, User";
}
session.setAttribute("session.active", count);
}
// Invoke methods in doPost
printHeader(out);
printSessionData(out, count, string, session);
printFooter(out);
}
    @Override
public String getServletInfo() {
return "SessionTrackerServlet";
}
/* -- Private Method -- */
// Method handle Output Form header
private void printHeader(PrintWriter out) {
out.println("<html>");
out.println("<head>");
out.println("<title> Session tracker </title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Information about session</h1>");
}
// Method handle output Form center
private void printSessionData(PrintWriter out, Integer count, String string, HttpSession session) {
out.println("<b><I>" + string + "</I></b>");
out.println("<BR>No. of time page visit : ");
out.println("<b>" + count + ((count.intValue() == 1) ? " times." : " times.") + "</b>");
out.println(" <hr align=\"left\" width=\"35%\"/>");
out.println("<b>Other Session Property</b>");
out.println("<BR>Current Session id: " + session.getId() + " <I>(keep it secret)</I>");
out.println("<BR>Max Timeout: " + session.getMaxInactiveInterval());
out.println("<I>(" + session.getMaxInactiveInterval() / 60 + " minutes)</I>");
out.println("<BR>Creation time: " + session.getCreationTime());
out.println("<I>(" + new Date(session.getCreationTime()) + ")</I>");
out.println("<BR>Last access time: " + session.getLastAccessedTime());
out.println("<I>(" + new Date(session.getLastAccessedTime()) + ")</I>");
}
// Method handel Output Form Footer
private void printFooter(PrintWriter out) {
out.println("</body>");
out.println("</html>");
out.println("<BR><BR><a href=\"SessionTrackerServlet\">Return to Home Page</a>");
}
}
 
 
 
Output:
 
jsp
 
s1
 
s2
 
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