protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		String strAction = request.getParameter("action");

		if(strAction!=null && !strAction.equals("")) {

			if(strAction.equals("add")) {

				addToCart(request);




			} else if (strAction.equals("Update")) {

				updateCart(request);


			} else if (strAction.equals("Delete")) {

				deleteCart(request);


			}


		}

		HttpSession session = request.getSession();

		Cart cart =(Cart) session.getAttribute("cart");


		int cartSize = cart.getCartItems().size();
		response.getWriter().print(cartSize);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
		doGet(request, response);
	}

	protected void deleteCart(HttpServletRequest request) {

		HttpSession session = request.getSession();

		String strId = request.getParameter("id");

		Cart cartBean = null;


		Object objCartBean = session.getAttribute("cart");

		if(objCartBean!=null) {

			cartBean = (Cart) objCartBean ;

		} else {

			cartBean = new Cart();

		}

		cartBean.deleteCartItem(strId);

	}


	protected void updateCart(HttpServletRequest request) {

		HttpSession session = request.getSession();
		String strQuantity = request.getParameter("quantity");
		String strId = request.getParameter("id");
		String size = request.getParameter("size");
		Cart cartBean = null;
		Object objCartBean = session.getAttribute("cart");

		if(objCartBean!=null) {

			cartBean = (Cart) objCartBean ;

		} else {

			cartBean = new Cart();

		}

		cartBean.updateCartItem(strId, strQuantity,size);

	}


	protected void addToCart(HttpServletRequest request) {

		HttpSession session = request.getSession();

		String strId = request.getParameter("id");
		String strQuantity = request.getParameter("quantity");
		String size = request.getParameter("size");
		Cart cartBean = null;

		Object objCartBean = session.getAttribute("cart");

		if(objCartBean!=null) {

			cartBean = (Cart) objCartBean ;

		} else {

			cartBean = new Cart();

			session.setAttribute("cart", cartBean);
		}

		ArrayList<Product> alCartItems = cartBean.getCartItems();

		int flag = 0;

		for(int i = 0 ; i < alCartItems.size() ; i++ ){
			if(alCartItems.get(i).getId() == Integer.parseInt(strId) && alCartItems.get(i).getSize().equalsIgnoreCase(size)){
				flag = 1;

			    int qtyNew = alCartItems.get(i).getQuantity() + Integer.parseInt(strQuantity);

				cartBean.updateCartItem(String.valueOf(strId), String.valueOf(qtyNew),size);
			}
		}

		if(flag == 0){
			try{
				Product cartItem = new Product();
				int idProduct = Integer.parseInt(strId);
				cartItem = model.doRetrieveByKey(idProduct);

				cartBean.addCartItem(cartItem, strQuantity,size);

			} catch (SQLException e) {
				System.out.println("Error:" + e.getMessage());
			}
		}

	}