laravelはミドルウェアを介したログインアクセスのルーティングをどのように検証しますか

//使用 make:middleware 命令来创建新的中间件。php artisan make:middleware Auth

// 在 App\Http\Kernel 类中...protected $routeMiddleware = [
    'auth' => \App\Http\Middleware\Authenticate::class,
    'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
    'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
    'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
    'can' => \Illuminate\Auth\Middleware\Authorize::class,
    'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
    'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
    'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
    'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class,];

public function handle($request, Closure $next)
 {
 		//通过判断session是否有用户名，判断是否登陆
       if(!session('user')){
            return redirect('/');
        }
        return $next($request);
 }

//namespace是命名空间，也就是你的controller文件在哪个文件夹里//middleware对应的就是你想调用的中间件，这里调用的是登录验证的中间件//auth就是你在App\Http\Kernel类中注册的名字Route::group(['namespace' => 'Admin', 'middleware' => ['auth']], function () {
    //后台首页
    Route::get('admin','admincontroller@index')->name('admin');
    //清除缓存路由
    Route::get('admin/clear','admincontroller@clear')->name('clear');
    //栏目资源路由
    Route::resource('admin/classify','classifycontroller');
    //公告资源路由
    Route::resource('admin/notice','classifynoticecontroller');});