laravel控制器使用中间件

public function __construct(){
$this->middleware('wechatapi');
}

protected $routeMiddleware = [
'auth' => \App\Http\Middleware\Authenticate::class,
'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
'wechatapi'=>\App\Http\Middleware\WechatApi::class,
];