控制器不存在:app\index\controller\Upload

        $this->app['hook']->listen('module_init');

        // 实例化控制器
        try {
            $instance = $this->app->controller($controller,
                $this->app->config('app.url_controller_layer'),
                $this->app->config('app.controller_suffix'),
                $this->app->config('app.empty_controller'));
        } catch (ClassNotFoundException $e) {
            throw new HttpException(404, 'controller not exists:' . $e->getClass());
        }

        // 获取当前操作名
        $action = $actionName . $this->app->config('app.action_suffix');

        if (is_callable([$instance, $action])) {
            // 执行操作方法
            $call = [$instance, $action];
            // 自动获取请求变量