session 失效请教一下jsp中关闭网页的时候使session失效如何做到

请教一下jsp中关闭网页的时候使session失效如何做到

public class LogoutAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) throws IOException { HttpSession session = request.getSession(); session.removeAttribute("username"); session.removeAttribute("id"); session.invalidate(); return mapping.findForward("ess"); } } 这是我的一个action里的代码，用于退出系统。如果觉得好，别忘了给分哦