Export data to Excel file using Laravel Voyager

I want to export posts data from Admin Pannel i added a button in:

\vendor\tcg\voyager\resources\views\bread\browse.blade.php

<a href="">
                        <button id="export-to-excel" type="button" class="btn btn-danger">EXPORT</button>
                        </a>

i use Maatwebsite package.. i installed the package via composer..

Can anyone suggest me that what's I'm doing wrong.

My Code :

. .

Web.php:

Route::group(['prefix' => 'admin','as' => 'voyager.', 'middleware' => 'admin.user'], function()
 {
 Route::get('ExportCommandes','ExportController@getExport');
});

ExcelController:

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use App\browse;
use Input;
use Excel;

class ExcelController extends Controller
{
    //
    public function getExport(){
       $post=Post::all();
       Excel::create('Export Data', function($excel) use($post){
       $excel->sheet('Sheet 1', function($sheet) use($post){
          $sheet->fromArray($post);
       });
       })->export('xlsx');
     }   
}

ExportCommandes.blade.php:

@extends('voyager::master')

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