Class 'App\Http\Controllers\Excel' not found in Laravel

After all this you need to check whether or not you have this at the top:

use Maatwebsite\Excel\Facades\Excel;

Instead of Excel::create you should use \Excel::create or add at the beginning of your file after current namespace use Excel; and then you will be able to use Excel::create

And the second error is that you used:

'Excel'     => 'Maatwebsite\Excel\ExcelServiceProvider',

and you should use:

'Excel' => 'Maatwebsite\Excel\Facades\Excel',

instead according to the docs.