阿里云上本地java应用连不上本地zookeeper

java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.7.0_181]
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:744) ~[na:1.7.0_181]
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1078) ~[zookeeper-3.3.1.jar:3.3.1-942149]
cas 2019-06-23 06:58:24,599 [localhost-startStop-1-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server localhost/127.0.0.1:2181
cas 2019-06-23 06:58:24,600 [localhost-startStop-1-SendThread(localhost:2181)] WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

手动命令连接没问题：

[zk: localhost:2181(CONNECTED) 1] ls /
[dubbo, testnode, funi, zookeeper]

java应用和zookeeper都再同一台服务器上。