dcat-admin 使用maatwebsite/excel: ^3

    // dcat-admin controller
    public function grid()
    {
        return Grid:make(function (Grid $grid) {
            $grid->export(new CustomExport())
        })
    }

use Dcat\Admin\Grid\Exporters\AbstractExporter;
use Maatwebsite\Excel\Concerns\FromCollection;
use Maatwebsite\Excel\Concerns\Exportable;

class CustomExport extends AbstractExporter implements FromCollection
{
    use Exportable; // not necessary

    public function collection()
    {
        return $this->buildData(); // from dcat abs
    }

    public function export()
    {
        Excel::download($this, 'filename')->send();
        // when use Exportable
        $this->dowload('filename')->send();
    }
}

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