init

app/code/Stemcell/Customer/Controller/Adminhtml/Lab/Sample.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Stemcell\Customer\Controller\Adminhtml\Lab;
+
+use Magento\Framework\App\Action\HttpGetActionInterface;
+
+class Sample implements HttpGetActionInterface
+{
+    protected \Magento\Framework\App\Response\Http\FileFactory $fileFactory;
+    private \Magento\Framework\Module\Dir $moduleDir;
+
+    public function __construct(
+        \Magento\Framework\App\Response\Http\FileFactory $fileFactory,
+        \Magento\Framework\Module\Dir $moduleDir
+    ) {
+        $this->fileFactory = $fileFactory;
+        $this->moduleDir = $moduleDir;
+    }
+
+    /**
+     * @throws \Exception
+     */
+    public function execute()
+    {
+        $file = $this->moduleDir->getDir('Stemcell_Customer').'/data/Sample.xlsx';
+        $content['type'] = 'filename';
+        $content['value'] = $file;
+        $content['rm'] = 0;
+        return $this->fileFactory->create('Sample.xlsx', $content);
+    }
+}