集群之 -- zookeeper -JAVA小例子 节点的操作

@Testpublic void tt() {    String connectionString = "192.168.1.100:2181,192.168.1.100:2182,192.168.1.100:2183";    int n =44;    try {        ZooKeeper zk = new ZooKeeper(connectionString, 50000, new Watcher(){            @Override            public void process(WatchedEvent e) {                System.out.println("mypath: " + e.getPath()+" mystate:"+e.getState()+" mytype:"+e.getType());                WatcherEvent we = e.getWrapper();                System.out.println(" we state:"+we.getState()+" we path:"+we.getPath()+" we type:"+we.getType());            }        });        System.out.println("zk已连接=======================");        ZooBean zb = new ZooBean();        zb.setA("cs===");        zb.setB("fark===");        String s = JsonUtil.toJson(zb);        zk.create("/root" + n, s.getBytes(),                ZooDefs.Ids.OPEN_ACL_UNSAFE,                CreateMode.PERSISTENT);        System.out.println("已创建一个bean==========================");        Stat stat = new Stat();        byte[] bytes = zk.getData("/root" + n, true, stat);        String r = new String(bytes);        System.out.println("r:" + r);        ZooBean zb1 = JsonUtil.toObject(r, ZooBean.class);        System.out.println("获得结果："+zb1.getA()+" "+zb1.getB());        System.out.println("修改成字符串===================");        zk.setData("/root" + n, ("byupdate" + n).getBytes(), -1);        byte[] bytes1 = zk.getData("/root" + n, true, stat);        String r1 = new String(bytes1);        System.out.println("输出字符串："+r1);        System.out.println("创建儿子节点=====");        zk.create("/root" + n + "/child",                "child".getBytes(),                ZooDefs.Ids.OPEN_ACL_UNSAFE,                CreateMode.PERSISTENT);        zk.create("/root" + n + "/child1",                "child1".getBytes(),                ZooDefs.Ids.OPEN_ACL_UNSAFE,                CreateMode.PERSISTENT);        /**         * 转自说明：http://www.cnblogs.com/shengkejava/p/5611671.html         *         * 提供默认的权限OPEN_ACL_UNSAFE、CREATOR_ALL_ACL、READ_ACL_UNSAFE         OPEN_ACL_UNSAFE：完全开放         CREATOR_ALL_ACL：创建该znode的连接拥有所有权限         READ_ACL_UNSAFE：所有的客户端都可读         * createMode:节点类型         PERSISTENT：持久化节点         PERSISTENT_SEQUENTIAL：持久化有序节点         EPHEMERAL：临时节点（连接断开自动删除）         EPHEMERAL_SEQUENTIAL：临时有序节点（连接断开自动删除）         */        List<String> childs = zk.getChildren("/root" + n, new Watcher() {            public void process(WatchedEvent we) {                System.out.println(" we state:" + we.getState() + " we path:" + we.getPath() + " we type:" + we.getType());            }        });        Stat st =  zk.exists("/root"+n+"/child", true);        System.out.println("儿子个数："+st.getNumChildren());        Stat st1 = zk.exists("/root"+n,true);        System.out.println("你是老子的儿子，有几个兄弟："+st1.getNumChildren());        System.out.println("删除儿子=======");        zk.delete("/root" + n + "/child", -1);        zk.delete("/root" + n + "/child1", -1);        System.out.println("删除老子======");        zk.delete("/root" + n, -1);        System.out.println("好了，关闭,一了百了=========");        zk.close();    } catch (Exception e) {        e.printStackTrace();    }}