[2019-08-31 17:26:40.688] boot -  WARN [main-SendThread(127.0.0.1:2181)] --- ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: Connection refused: no further information

查了一下，说是zookeeper没有开启。我用的IDEA上面的zookeeper，我觉得可能会和这个有关吧。