@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport{@Overrideprotected void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/login")；}
}

public class LoginInterceptor implements HandlerInterceptor{@Overridepublic void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)throws Exception {// TODO Auto-generated method stub
        }@Overridepublic void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)throws Exception {// TODO Auto-generated method stub
        }@Overridepublic boolean preHandle(HttpServletRequest hServletRequest, HttpServletResponse hServletResponse, Object object) throws Exception {// 案例采用session存储登录用户，所以从session获取登录用户　　　　 HttpSession session = hServletRequest.getSession();TUser tUser=(TUser)session.getAttribute("user");        // 判断session里是否能取出用户if(tUser==null) {returnErrorMessage(hServletResponse, "当前操作需要先进行用户登录");return false;}return true;}private void returnErrorMessage(HttpServletResponse response, String errorMessage) throws IOException {response.setCharacterEncoding("utf-8");Map<String, Object> var=new HashMap<>();var.put("success", false);var.put("errorMessage", errorMessage);response.setContentType("application/json");PrintWriter out = response.getWriter();ObjectMapper mapper = new ObjectMapper();String jsonOfRST =mapper.writeValueAsString(var);out.print(jsonOfRST);out.flush();}
}

public class UnloggedException extends RuntimeException{private static final long serialVersionUID = 181074719716690931L;public UnloggedException() {super("当前操作需要先进行登录");}
}

@Overridepublic boolean preHandle(HttpServletRequest hServletRequest, HttpServletResponse hServletResponse, Object object) throws Exception {HttpSession session = hServletRequest.getSession();TUser tUser=(TUser)session.getAttribute("user");if(tUser==null) {throw new UnloggedException();}return true;}

@ControllerAdvice
@ResponseBody
public class GlobalExceptionHandler {@ExceptionHandlerpublic JSONObject handleException(Exception e) {return ActionHelper.responseFailed(e.getMessage());}
}