laravel5.4 前后台未登陆，跳转到各自的页面

        <?php
        'defaults' => [
           'guard' => 'web',
           'passwords' => 'users',
        ],
        'guards' => [
           'web' => [
               'driver' => 'session',
               'provider' => 'users',
            ],
           'api' => [
               'driver' => 'token',
               'provider' => 'users',
            ],
           'admin' => [
               'driver' => 'session',
               'provider' => 'admins',
            ],
        ],
        'providers' => [
           'users' => [
               'driver' => 'eloquent',
               'model' => App\User::class,
            ],
           'admins' => [
               'driver' => 'eloquent',
               'model' => App\AdminUser::class,
            ],
        ],
        'passwords' => [
           'users' => [
               'provider' => 'users',
               'table' => 'password_resets',
               'expire' => 60,
            ],
        ],
    
   

        //登陆页面
        Route::get('/login', "\App\Http\Controllers\LoginController@index")->name('login');
        //登陆行为
        Route::post('/login', "\App\Http\Controllers\LoginController@login");
        Route::group(['middleware' => 'auth:web'],function (){
            Route::get('/posts', '\App\Http\Controllers\PostController@index');
        }
        //后台
        Route::group(['prefix' => 'admin'], function() {
            Route::get('/login', '\App\Admin\Controllers\LoginController@index');
            Route::post('/login', '\App\Admin\Controllers\LoginController@login');
            Route::get('/logout', '\App\Admin\Controllers\LoginController@logout');
            Route::group(['middleware' => 'auth:admin'],function (){
                Route::get('/home', '\App\Admin\Controllers\HomeController@index');
            });
        });
    
   

        <?php
        namespace App\Exceptions;
        use Exception;
        use Illuminate\Auth\AuthenticationException;
        use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
        class Handler extends ExceptionHandler
        {
           /**
         * A list of the exception types that should not be reported.
         *
         * @var array
         */
           protected $dontReport = [
                \Illuminate\Auth\AuthenticationException::class,
                \Illuminate\Auth\Access\AuthorizationException::class,
                \Symfony\Component\HttpKernel\Exception\HttpException::class,
                \Illuminate\Database\Eloquent\ModelNotFoundException::class,
                \Illuminate\Session\TokenMismatchException::class,
                \Illuminate\Validation\ValidationException::class,
            ];
           /**
         * Report or log an exception.
         *
         * This is a great spot to send exceptions to Sentry, Bugsnag, etc.
         *
         * @param \Exception $exception
         * @return void
         */
           public function report(Exception $exception)
            {
               parent::report($exception);
            }
           /**
         * Render an exception into an HTTP response.
         *
         * @param \Illuminate\Http\Request $request
         * @param \Exception $exception
         * @return \Illuminate\Http\Response
         */
           public function render($request, Exception $exception)
            {
               return parent::render($request, $exception);
            }
           /**
         * Convert an authentication exception into an unauthenticated response.
         *
         * @param \Illuminate\Http\Request $request
         * @param \Illuminate\Auth\AuthenticationException $exception
         * @return \Illuminate\Http\Response
         */
           protected function unauthenticated($request, AuthenticationException $exception)
            {
               if ($request->expectsJson()) {
                   return response()->json(['error' => 'Unauthenticated.'], 401);
                }
               if (in_array('admin', $exception->guards())) {
                   return redirect()->guest('/admin/login');
                }
               #return redirect()->guest(route('login'));
    
   

　　　　return redirect()->guest(route('/')); #亲测可行

} }