Get the route name of the current page in Drupal 8

$route_name = \Drupal::routeMatch()->getRouteName();

$current_route_name = \Drupal::service('current_route_match')->getRouteName();

if (\Drupal::routeMatch()->getRouteName() == 'entity.taxonomy_term.canonical') {
    $term_id = \Drupal::routeMatch()->getRawParameter('taxonomy_term');
}

$route_match = \Drupal::routeMatch();
if ($route_match->getRouteName() == 'entity.node.canonical') {
    $node = $route_match->getParameter('node');
}
elseif ($route_match->getRouteName() == 'entity.node.revision') {
    $revision_id = $route_match->getParameter('node_revision');
    $node = node_revision_load($revision_id);
}
elseif ($route_match->getRouteName() == 'entity.node.preview') {
    $node = $route_match->getParameter('node_preview');
}

if (\Drupal::routeMatch()->getRouteName() == 'entity.contact_form.canonical') {
    //  contact form
    $contact_form = \Drupal::routeMatch()->getParameter('contact_form');
}

$current_route_name = \Drupal::service('current_route_match')->getRouteName();