Session issue : spring framework, j2ee, ajax, jsp, servlet

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10/05/2009 at 05:47PM PDT, ID: 24787495

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5.8

Session issue

Asked by Micheal_Male in Java Servlets, J2EE, Asynchronous Javascript and XML (AJAX)

Tags: spring framework, j2ee, ajax, jsp, servlet

I got a solution from one of the expert and was able to implement it also. What i want to do is keep the session alive for long forms. However, i can see that the JS function does hit my servlet but unfortunately the session still gets destroyed after default 30 min time instead of being extended. I do have a HttpSessionListener class which is set to default 30 min.

I added some log statements to see when the session is created and destroyed and it gets destroyed after 30 min. However when it reached 29 min i tried going to another page and everything works great.

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             import java.io.IOException;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * Servlet implementation class PingSession
 */
public class PingSession extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
 
    public PingSession() {
        super();
    }
 
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		super.doPost(request, response);
	}
 
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		StringBuffer xml = new StringBuffer();
		xml.append("<?xml version=\"1.0\"?>\n");
		xml.append("<session userid=\"" + (String)request.getSession().getAttribute("users") + "\">\n");
		xml.append("</session>\n");
		System.out.println(xml.toString());
		response.setContentType("text/xml");
		response.getWriter().write(xml.toString());
		response.getWriter().flush();
	}
 
}
*******************************
JS Function
******************************
 
 
 
function newXMLHttpRequest()
{
        var xmlreq = false;
 
        
        if (window.XMLHttpRequest)
        {
          xmlreq = new XMLHttpRequest();
        }
        else if (window.ActiveXObject)
        {
            try
            {
              
        
              xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
            }
            catch (e1)
            {
                       
                        try
                        {
                               
                                
                                xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
                        }
                        catch (e2)
                        {
                         
                          xmlreq = false;
                        }
                }
        }
 
        return xmlreq;
}
 
 
 
function getReadyStateHandler(req, responseXmlHandler)
{
        
        return function ()
        {
                
                if (req.readyState == 4)
                {
                        
                        if (req.status == 200) 
                        {
                                
                                responseXmlHandler(req.responseXML);
                        }
                        else
                        {
                                
                                alert("HTTP error "+req.status+": "+req.statusText);
                        }
                }
        }
}
 
function extendSession(){
  var req = newXMLHttpRequest(); 
  req.onreadystatechange = getReadyStateHandler(req, updateSessionInfo);
  req.open("POST", "/servlet/PingSession", true);
  req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  req.send("pageKey=extendSession");
}
 
function updateSessionInfo(sessionXML){
          var session = sessionXML.getElementsByTagName("session")[0];
          var userid = session.getAttribute("userid");     
          if(userid == 'null' || userid == null){
                  msgToUser();
          }
}
 
function promptUser(){
  if (confirm('Your login session will expire in 5 minute. Extend the session?')){
                extendSession();
                setSessionTimeout();
  }
}
 
 
 
function setSessionTimeout(){
      setTimeout('promptUser()', 25 * 60 * 1000);
}
 
setSessionTimeout();

           
         

Keywords: Session issue

	Title
1	Question on sessions

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Session issue

Asked by Micheal_Male in Java Servlets, J2EE, Asynchronous Javascript and XML (AJAX)

Tags: spring framework, j2ee, ajax, jsp, servlet

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