SpringMVC控制器：如果发生表单验证错误，如何留在页面上

我想在这个文件档案化管理解决方案后，在本周末，但它并不适用于BindingResult工作。

下面的代码有效，但并不完美。

@ModelAttribute("command")public PlaceOrderCommand command() {    return new PlaceOrderCommand();}@RequestMapping(value = "/placeOrder", method = RequestMethod.GET)public String placeOrder(        @ModelAttribute("command") PlaceOrderCommand command,        ModelMap modelMap) {    modelMap.put(BindingResult.MODEL_KEY_PREFIX + "command", modelMap.get("errors"));    return "placeOrder";}@RequestMapping(value = "/placeOrder", method = RequestMethod.POST)public String placeOrder(        @Valid @ModelAttribute("command") PlaceOrderCommand command,        final BindingResult bindingResult, Model model,        final RedirectAttributes redirectAttributes) {    if (bindingResult.hasErrors()) {        redirectAttributes.addFlashAttribute("errors", bindingResult);        //it doesn't work when passing this       //redirectAttributes.addFlashAttribute(BindingResult.MODEL_KEY_PREFIX + "command", bindingResult);        redirectAttributes.addFlashAttribute("command", command);        return "redirect:/booking/placeOrder";    }    ......}