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

具体异常信息：
java.ConnectException: Connection refused: no further information
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1141)
2018-08-23 14:29:30,700 [localhost-startStop-1-SendThread(192.168.43.31:2181)] [org.apache.zookeeper.ClientCnxnSocketNIO]-[DEBUG] Ignoring exception during shutdown input
java.nio.channels.ClosedChannelException
at sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:780)
at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:399)
at org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:200)
at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1246)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1170)
2018-08-23 14:29:30,701 [localhost-startStop-1-SendThread(192.168.43.31:2181)] [org.apache.zookeeper.ClientCnxnSocketNIO]-[DEBUG] Ignoring exception during shutdown output
java.nio.channels.ClosedChannelException
at sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:797)
at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:407)
at org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:207)
at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1246)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1170)
异常原因：
zookeeper未启动。
解决方法：

再次启动tomcat，成功。