我想显示我的错误信息从控制器到HTML百里叶弹簧靴

Question

if(checkcode.isPresent()){          
redirectAttributes.addFlashAttribute("errorMessage", "This products have already !");
return "redirect:/save-product";

} else if (checkname.isPresent()) {

redirectAttributes.addFlashAttribute("errorMessage", "This product have already !");
return "redirect:/save-product";
}

<div th:if="${errorMessage}">
<div th:text="${errorMessage}"></div>
</div>

这是我的控制器和我的div显示错误信息给thymleaf但是这个不能显示在我的thymleaf页面

Answer 1

addFlashAttribute()修改为addAttribute()