spring-mvc - Spring MVC：如何删除会话属性？

Question

下面的使用示例@SessionAttributes。向导完成后如何清除user会话属性？在我的示例中，返回/wizard0会话属性后仍然存在。我试过了status.setComplete()，session.removeAttribute("user")但它不起作用。

@Controller
@SessionAttributes("user")
public class UserWizard {

    @RequestMapping(value = "/wizard0", method = RequestMethod.GET)
    public String page1(Model model) {
        if(!model.containsAttribute("user")) {
            model.addAttribute("user", new User());
        }
        return "wizard/page1";
    }

    @RequestMapping(value = "/wizard1", method = RequestMethod.GET)
    public String page2(@ModelAttribute User user) {
        user.setFirstname(Utils.randomString());
        return "wizard/page2";
    }

    @RequestMapping(value = "/wizard2", method = RequestMethod.GET)
    public String page3(@ModelAttribute User user) {
        user.setLastname(Utils.randomString());
        return "wizard/page3";
    }

    @RequestMapping(value = "/finish", method = RequestMethod.GET)
    public String page4(@ModelAttribute User user, HttpSession session, SessionStatus status) {
        /**
         * store User ...
         */
        status.setComplete();
        session.removeAttribute("user");
        return "redirect:/home";
    }

}

编辑

我的错。status.setComplete();效果很好。session.removeAttribute("user")在这里没什么可做的。

Answer 1

尝试使用WebRequest.removeAttribute方法而不是HttpSession.setAttribute方法（示例 1）。或另一种完全相同的方式，您可以使用“SessionAttributeStore.cleanupAttribute”（示例 2）。

例 1

@RequestMapping(value = "/finish", method = RequestMethod.GET)
public String page4(@ModelAttribute User user, WebRequest request, SessionStatus status) {
    /**
     * store User ...
     */
    status.setComplete();
    request.removeAttribute("user", WebRequest.SCOPE_SESSION);
    return "redirect:/home";
}

例 2

@RequestMapping(value = "/finish", method = RequestMethod.GET)
public String page4(@ModelAttribute User user, WebRequest request, SessionAttributeStore store, SessionStatus status) {
    /**
     * store User ...
     */
    status.setComplete();
    store.cleanupAttribute(request, "user");
    return "redirect:/home";
}

Answer 2

下面为我​​工作 -

@RequestMapping(value = "/finish", method = RequestMethod.GET)
public String page4(HttpSession httpsession, SessionStatus status) {

/*Mark the current handler's session processing as complete, allowing for cleanup of 
  session attributes.*/
status.setComplete();

/* Invalidates this session then unbinds any objects boundto it. */
httpsession.invalidate();
return "redirect:/home";
}