public List<String> getChildren(final String key) {
        try {
            return client.getChildren().forPath(key);
        } catch (Exception e) {
            LOGGER.error("zookeeper get child error=", e);
            return Collections.emptyList();
        }
    }
get children with specific key.

@param key zookeeper key.
@return children node name.
shenyu-admin/src/main/java/org/apache/shenyu/admin/mode/cluster/impl/zookeeper/ClusterZookeeperClient.java