Example: SessionSample.java

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;


public class SessionSample  extends HttpServlet {
  public void doGet  HttpServletRequest(request, HttpServletResponse response)  
       throws ServletException, IOException {


   // Step 1: Get the Session object
 
      boolean create = true;         
      HttpSession session = request.getSession(create);
 
   // Step 2: Get the session data value


      Integer ival = (Integer)              
      session.getAttribute ("sessiontest.counter");         
      if (ival == null) ival = new Integer (1);         
      else ival = new Integer (ival.intValue () + 1);           
      session.setAttribute ("sessiontest.counter", ival);       

   // Step 3: Output the page

      response.setContentType("text/html"); 
      PrintWriter out = response.getWriter(); 
      out.println("<html>");  
      out.println("<head><title>Session Tracking Test</title></head>");
      out.println("<body>");
      out.println("<h1>Session Tracking Test</h1>");
      out.println ("You have hit this page " + ival + " times" + "<br>");
      out.println ("Your " + request.getHeader("Cookie"));
      out.println("</body></html>");    
   }
}

 

See Also

Developing session management in servlets