jsp页面中用户注销的写法

1 <c:if test="${not empty sessionScope.user}">
2         <div class="logout right"><a href="doLogoutServlet" title="注销">注销</a></div>
3     </c:if>

 1 public void doPost(HttpServletRequest request, HttpServletResponse response)
 2             throws ServletException, IOException {
 3         try {
 4             if(request.getSession().getAttribute("user")==null)
 5                 throw new Exception("登录已超时！");
 6             Boolean isAdmin = ((Auctionuser)request.getSession().getAttribute("user")).getUserisadmin();
 7             request.getSession().invalidate();
 8             if(isAdmin){
 9                 response.sendRedirect("login-admin.jsp");
10             }else{
11                 response.sendRedirect("login.jsp");
12             }            
13         } catch (Exception e) {
14             // TODO Auto-generated catch block
15             e.printStackTrace();
16             request.setAttribute("message", e.getMessage());
17             request.getRequestDispatcher("error.jsp").forward(request,response);
18         }
19     }