StandardJanusGraph graph = (StandardJanusGraph) JanusGraphFactory.build().set("storage.backend", "cql").
        set("storage.hostname", "192.168.223.3:51705,192.168.223.4:51705,192.168.223.5:51705,").
        open();

only one node's is correct, the others' port change to 9042, the default one. so I can only connect to one node.
I try to fix this, but it only useful when all nodes' port are the same.if different node has different port.it will not work.
So I hope someone will have a good solution.