攔截器（Intercept）

    // 創(chuàng)建自定義攔截器
    public class UserSessionChecker implements IInterceptor {
        public Object intercept(InterceptContext context) throws Exception {
            // 判斷當(dāng)前攔截器執(zhí)行方向
            if (context.getDirection().equals(Direction.BEFORE)
                    && WebContext.getRequest().getSession(false) == null) {
                return View.redirectView("/user/login");
            }
            return null;
        }
    }

    @Controller
    @RequestMapping("/user")
    @Before(UserSessionChecker.class)
    public class Controller {

        @RequestMapping("/center")
        public IView userCenter() throws Exception {
            // ......
            return View.jspView("/user/center");
        }

        @RequestMapping("/login")
        @Clean
        public IView userLogin() throws Exception {
            return View.jspView("/user/login");
        }
    }