spring mvc转发和重定向到根index.jsp

@RequestMapping("/goIndex.action")
public String goIndex(HttpServletRequest request,HttpServletResponse response){
HttpSession session = request.getSession();
String bycart = (String) session.getAttribute("Bycart");
if(bycart!=null&&bycart.equals("ok")){
Cart cart = (Cart) session.getAttribute("cart");
request.setAttribute("cart",cart);

return "forward:gopay.action";
}else{
return "redirect:/index.jsp"; 
}
}