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private ArrayList<ProductoParaVender> obtenerCarrito(HttpServletRequest request) {
ArrayList<ProductoParaVender> carrito = (ArrayList<ProductoParaVender>) request.getSession().getAttribute("carrito");
if (carrito == null) {
carrito = new ArrayList<>();
}
return carrito;
}
private void guardarCarrito(ArrayList<ProductoParaVender> carrito, HttpServletRequest request) {
request.getSession().setAttribute("carrito", carrito);
}
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