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session.setAttribute("userid",null);
/**
* 登出
*/
public ActionForward logout(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
/** 清除session中的用户信息并销毁当前session */
request.getSession().removeAttribute("user");
request.getSession().removeAttribute("modules");
request.getSession().removeAttribute("functions");
request.getSession().removeAttribute("allUsers");
request.getSession().invalidate();
response.sendRedirect("/SIMS/index.jsp");
return null;
}