Get current Language in TYPO3 Neos Controller

StandardController.php

<?php
namespace My\Custom\Controller;

use TYPO3\Flow\Annotations as Flow;

class StandardController extends \TYPO3\Flow\Mvc\Controller\ActionController {

	/**
	 * @Flow\Inject
	 * @var \TYPO3\Flow\I18n\Service
	 */
	protected $i18nService;

	/**
	 * @return void
	 */
	public function indexAction() {

		exit( (string)$this->i18nService->getConfiguration()->getCurrentLocale() );

	}

}