code: @Override
      public SimpleZooKeeperClient doConnect() throws IOException, InterruptedException {
          LOG.info("Connecting to zookeeper server - " + zooConf.getOnlineServerList());
          return new SimpleZooKeeperClient(zooConf.getOnlineServerList(),
                  zooConf.getOnlineDigestAuth(), new ServerServiceWatcher(),
                  zooConf.getSessionTimeout(), zooConf.getConnTimeout());
      }
docs: 连接zookeeper
  
  @see com.baidu.beidou.navimgr.zoo.service.impl.AbstractZooService#doConnect()