t_nine/app/Http/Controllers/Api/ExcelController.php

<?php
namespace App\Http\Controllers\Api;

use App\Exports\MyExport;
use Illuminate\Http\Request;

//导入导出
class ExcelController extends BaseController
{
    /**
     * 下载
     * @param Request $request
     * @return \Symfony\Component\HttpFoundation\BinaryFileResponse
     */
    public function excelDownload(Request $request){

        $data = $request->all();
        $file_name = $data['file_name'];
        $excel = new MyExport();
        return  $excel->excelDownload($file_name);
    }

}