Java Spring MVC 如何获取这个设定值？

Question

如何通过 GET 方法获取已设置的值？如何将值传递给 POST 方法？我应该声明全局变量吗？

编辑:我想要的是在 GET 方法上做一些事情，如果 setdisplayBox = true，则在 jsp 上显示一个文本框。当用户 POST 表单时，setdisplayBox 也应该为 true 并返回相同的 jsp 而无需重定向

@RequestMapping(method = RequestMethod.GET)
public String getSuccess(ModelMap model, @ModelAttribute("user") User user, HttpServletRequest request)
{
    String boxDisplay = "True"; 
    user.setdisplayBox(boxDisplay);
    return "success";
}

@RequestMapping(method = RequestMethod.POST)
public String resetPassword(HttpServletRequest request, ModelMap model, @ModelAttribute("user") User user, ModelMap modelMap) 
{
    user.setdisplayBox(user.getdisplayBox()); //how to get value has been set above?
    return "success";
}

Answer 1

为用户设置全局变量。

private User userAccount;

@RequestMapping(method = RequestMethod.GET)
public String getSuccess(ModelMap model, @ModelAttribute("user") User user, HttpServletRequest request)
{
    String boxDisplay = "True"; 
    user.setdisplayBox(boxDisplay);
    userAccount = user; //load user in to global var 
    return "success";
}

@RequestMapping(method = RequestMethod.POST)
public String resetPassword(HttpServletRequest request, ModelMap model, @ModelAttribute("user") User user, ModelMap modelMap) 
{
    user.setdisplayBox(userAccount.getdisplayBox()); 
    userAccount = null; //reset it to something to make sure you are loading it to another user later.
    return "success";
}