import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/your_server")
public class HomeController {
    @RequestMapping("")
    public String index(HttpSession session) {
        if (session.isNew()) {
            session.setAttribute("counter", 0);
        }
        Integer count = (Integer) session.getAttribute("counter");
        count += 1;
        session.setAttribute("counter", count);

        return "index.jsp";
    }

    @RequestMapping("/counter")
    public String showCounter(HttpSession session, Model model) {
        if (session.isNew()) {
            session.setAttribute("counter", 0);
        }
        model.addAttribute("counter", session.getAttribute("counter"));
        return "counter.jsp";
    }

    @RequestMapping("/reset")
    public String resetCounter(HttpSession session) {
        session.invalidate();
        return "forward:/";
    }
}