if(action.equals("login")){            
            String UserID = request.getParameter("UserID");
            String Password = request.getParameter("Password");
            User u = userService.login(UserID, Password);
            
            if (null != u) {    //验证成功，还要看is_delete
                
                if (u.getIsDelete() == 0) {     
                    request.getSession().setAttribute("user", u);
                    response.sendRedirect("user?action=index");
                } else {
                    request.getSession().setAttribute("userIsDeleMsg", "该用户已被禁用，无法登录！");
                    response.sendRedirect("Login.jsp");
                }
                
            } else {
                request.getSession().setAttribute("msg", "验证失败，请重新输入用户名或密码！");
                response.sendRedirect("Login.jsp");
            }
        
        }else if(action.equals("index")){
            //跳转到活动首页            
            
            
            request.getRequestDispatcher("/index.jsp").forward(request, response);
        }else if(action.equals("register")){
            String UserID = request.getParameter("UserID");
            String UserName = request.getParameter("UserName");
            String email = request.getParameter("email");
            String Password = request.getParameter("Password");
            int id = userService.getIdByuserName(UserName);    //根据username查询用户id
            User u = userService.getByEmail(email);                   //根据email查询用户
            
            if ((id > 0) || (null != u)) {
                request.getSession().setAttribute("existMsg", "用户名或邮箱已被注册，请重新填写！");
                
            } else {
                int res = userService.register(email, UserName, Password,UserID);
                
                if (res > 0) {                    //注册成功!
                    request.getSession().setAttribute("succMsg", "注册成功");
                } else {
                    request.setAttribute("errorMsg", "注册失败，请重新填写用户信息！");
                }
            }
            
            response.sendRedirect("Register.jsp");
        }