protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub// 步驟1：通過session獲取登錄的賬號HttpSession session = request.getSession();Student student = (Student) session.getAttribute("student");// 步驟2：銷毀sessionsession.invalidate();// 步驟3：從在線列表中移除當前登錄賬號@SuppressWarnings("unchecked")List<Integer> sidOnLineList = (List<Integer>) this.getServletContext().getAttribute("sidOnLineList");sidOnLineList.remove(student.getSid()); // 移除this.getServletContext().setAttribute("sidOnLineList",sidOnLineList); // 刷新在線列表// 步驟4：頁面跳轉response.sendRedirect("jsp/login.jsp");}}。