how to keep session alive after page refresh - session

Question

Please how do I keep the home session alive when a user refreshes the browser ?
Because after login, the home page session is alive. But when I refresh the browser, it takes me back to login page.
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* #author Maxwell
*/
#WebFilter(filterName = "sessionFilter", urlPatterns = {"/*"})
public class sessionFilter implements Filter {
#Override
public void init(FilterConfig filterConfig) throws ServletException {
}
#Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req1 =(HttpServletRequest)request;
HttpServletResponse res1 =(HttpServletResponse)response;
String session = (String)req1.getSession().getAttribute("pnumber");
String currentPath = req1.getRequestURL().toString();
if(session != null)
{
if(currentPath.contains("login.xhtml"))
{
res1.sendRedirect(req1.getContextPath()+"/home.xhtml");
System.out.println("it is nt empty");
}
else
{
chain.doFilter(request, response);
}
//System.out.println("it is nt empty");
}
else
{
if(currentPath.contains("home"))
{
res1.sendRedirect(req1.getContextPath()+"/login.xhtml");
System.out.println("somefin is wrong");
}
else
{
chain.doFilter(request, response);
}
//System.out.println("somefin is wrong");
}
}
#Override
public void destroy() {
}
}
Please how do I keep the home session alive when a user refreshes the browser?
Because after login, the home page session is alive. But when I refresh the browser, it takes me back to login page.

Answer 1

is there any warning or error in the console when refreshing the page? Well, for session management in JSF, I'd do the following:
1) I'd use a ManagedBean #SessionScoped, where I'll keep the user info into a SessionMap once s/he has logged in:
public void login(){
//your code
if(validations){
FacesContext fc = FacesContext.getCurrentInstance();
fc.getExternalContext().getSessionMap().put("loggedUser", User);
//User is the entity which contains the current user info.
//You can use any data to keep in the SessionMap ;-)
}
}
2) When the user clicks on logout, you have invalidate the session:
FacesContext fc = FacesContext.getCurrentInstance();
fc.getExternalContext().invalidateSession();
3) Now if you want to validate the session when the user types the URL directly without logging in from the login page:
public void validateSession(){
FacesContext fc = FacesContext.getCurrentInstance();
User currentUser = (User) fc.getExternalContext().getSessionMap().get("loggedUser");
if(currentUser==null){
//shows a message 'Session has caducated'
fc.getExternalContext().redirect("./login.xhtml");
}
}
Then you just call the method before rendering the view:
<f:event type="preRenderView" listener="#{loginBean.validateSession()}" />
4) If you'd like to get the current user data from any managedBean, you have to get it from the SessionMap:
FacesContext fc = FacesContext.getCurrentInstance();
User user = (User) fc.getExternalContext().getSessionMap().get("loggedUser");
Hope this helps ;-)