koszyk - inicjalizacja w listenerze sesji

PC25-SklepWeb/src/main/java/sklep/basket/AddToBasket.java

@@ -26,10 +26,6 @@ public class AddToBasket extends HttpServlet {
 				
 				HttpSession sesja = request.getSession();
 				Basket basket = (Basket)sesja.getAttribute("basket");
-				if(basket == null) {
-					basket = new Basket();
-					sesja.setAttribute("basket", basket);
-				}
 				basket.addProduct(product);
 			}
 		} catch(Exception e) {

PC25-SklepWeb/src/main/java/sklep/basket/BasketInitialization.java

+package sklep.basket;
+
+import jakarta.servlet.annotation.WebListener;
+import jakarta.servlet.http.HttpSession;
+import jakarta.servlet.http.HttpSessionEvent;
+import jakarta.servlet.http.HttpSessionListener;
+
+@WebListener
+public class BasketInitialization implements HttpSessionListener {
+
+	public void sessionCreated(HttpSessionEvent se) {
+		HttpSession session = se.getSession();
+		session.setMaxInactiveInterval(30); // sesja wygasa po pół minuty - tylko na potrzeby zajęć
+		session.setAttribute("basket", new Basket());
+		System.out.println("Początek sesji " + session.getId());
+	}
+
+	public void sessionDestroyed(HttpSessionEvent se) {
+		System.out.println("Koniec sesji " + se.getSession().getId());
+	}
+
+}