Receive Post Parameters In Magento 2 Controller

To get Post data in controller you need to use following in your execute function.

public function execute()
{
    $post = $this->getRequest()->getPostValue();

    echo "<pre>";
    print_r($post);
    exit;

}

If you want to get post data from controller,

$post = $this->getRequest()->getPostValue();

Here your full code,

Also You have to declare storemanager object inside __construct() function of your php file instead of use dirctly objectmanager.

I have updated your code as below,

class Index extends \Magento\Framework\App\Action\Action
{

    /**
     * @var \Magento\Framework\App\Cache\TypeListInterface
     */
    protected $_cacheTypeList;

    /**
     * @var \Magento\Framework\App\Cache\StateInterface
     */
    protected $_cacheState;

    /**
     * @var \Magento\Framework\App\Cache\Frontend\Pool
     */
    protected $_cacheFrontendPool;

    /**
     * @var \Magento\Framework\View\Result\PageFactory
     */
    protected $resultPageFactory;

    /**
     * @param Action\Context $context
     * @param \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList
     * @param \Magento\Framework\App\Cache\StateInterface $cacheState
     * @param \Magento\Framework\App\Cache\Frontend\Pool $cacheFrontendPool
     * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
     */
    public function __construct(
       \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Framework\App\Cache\StateInterface $cacheState,
        \Magento\Framework\App\Cache\Frontend\Pool $cacheFrontendPool,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager
    ) {
        parent::__construct($context);
        $this->_cacheTypeList = $cacheTypeList;
        $this->_cacheState = $cacheState;
        $this->_cacheFrontendPool = $cacheFrontendPool;
        $this->resultPageFactory = $resultPageFactory;
        $this->storeManager = $storeManager;
    }

    /**
     * Flush cache storage
     *
     */
    public function execute()
    {
        $currentStore = $this->storeManager->getStore();
        $baseUrl = $currentStore->getBaseUrl();

        $post = $this->getRequest()->getPostValue();

        echo "<pre>";
        print_r($post);
        exit;

    }
}