magento中使用session

获取sessionObj

use Magento\Framework\ObjectManagerInterface;
/**
 * @var ObjectManagerInterface
 */
protected $_objectManager;

/**
 * @param Context $context
 */
public function __construct(Context $context)
{
    parent::__construct($context);
    $this->_objectManager = $context->getObjectManager();
    $this->_eventManager = $context->getEventManager();
    $this->_url = $context->getUrl();
    $this->_actionFlag = $context->getActionFlag();
    $this->_redirect = $context->getRedirect();
    $this->_view = $context->getView();
    $this->messageManager = $context->getMessageManager();
}

public function getSession() {
    return $this->_objectManager->get('Magento\Framework\Session\Storage');
}