Spring MVC: How to remove session attribute?

问题

Example of using @SessionAttributes below. How to clear user session attribute after wizard finished ? In my example after returning to /wizard0 session attribute still exists. I've tried status.setComplete() and session.removeAttribute("user") but it doesn't work.

@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";
    }

}

EDIT

My mistake. status.setComplete(); works good. session.removeAttribute("user") is nothing to do here.

回答1:

Try to use WebRequest.removeAttribute method instead of HttpSession.setAttribute method (example 1). Or another way which do exactly the same you can use 'SessionAttributeStore.cleanupAttribute' (example 2).

EXAMPLE 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";
}

EXAMPLE 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";
}

来源：https://stackoverflow.com/questions/18209233/spring-mvc-how-to-remove-session-attribute

标签

spring-mvc

spring-3