zookeeper-java zkclient

依赖

            org.apache.zookeeper
            zookeeper
            3.5.7
        

基本操作

zookeeper 客户端创建

public static ZooKeeper getZookeeperConn(String address) throws IOException {
        ZooKeeper zooKeeper = new ZooKeeper(address, 5000, watchedEvent -> System.out.println("type:" + watchedEvent.getType() + "keepstat:" + watchedEvent.getState().getIntValue()));
        System.out.println("创建连接成功"+zooKeeper.getSessionId());
        return zooKeeper;
    }

创建节点

public static void zKCreateOp() throws IOException, KeeperException, InterruptedException {
        ZooKeeper zookeeper = getZookeeperConn("127.0.0.1:2181");
        if (zookeeper != null) {
            /**
             * 创建临时节点
             * Zookeeper ZooDefs.Ids
             * OPEN_ACL_UNSAFE  : 完全开放的ACL，任何连接的客户端都可以操作该属性znode
             * CREATOR_ALL_ACL : 只有创建者才有ACL权限
             * READ_ACL_UNSAFE：只能读取ACL
             */
//            System.out.println(zookeeper.create("/mydata/dev1", "zl-100".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL));
            //重复创建节点(KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /mydata/dev1)
//            System.out.println(zookeeper.create("/mydata/dev1","zl-100".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL));
            //路径不存在的节点
//            System.out.println(zookeeper.create("/father", "new node".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL));
            System.out.println(zookeeper.create("/lock/seq_node", "zl-sequential".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL));
            //重复节点
            System.out.println(zookeeper.create("/lock/seq_node", "zl-sequential".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL));

            List children = zookeeper.getChildren("/lock", false);
            children.stream().forEach(System.out::println);
        }
    }

获取数据

public static void getOp() throws IOException, KeeperException, InterruptedException {
        ZooKeeper zookeeper = getZookeeperConn("127.0.0.1:2181");
        //获取子节点
        List children = zookeeper.getChildren("/", false);
        System.out.println("所有的字节点：");
        children.stream().forEach(System.out::println);
        //获取指定节点的权限信息
        List acl = zookeeper.getACL("/test", new Stat());
        System.out.println("节点权限信息：");
        acl.stream().forEach(System.out::println);
        //获取节点数据
        System.out.println("节点数据;");
        byte[] data = zookeeper.getData("/test", false, new Stat());
        System.out.println(new String(data));
        //获取客户端状态
        ZooKeeper.States state = zookeeper.getState();
        System.out.println("zk stats :" + state);
    }

set 数据

public static void setOp() throws IOException, KeeperException, InterruptedException {
        ZooKeeper zookeeper = getZookeeperConn("127.0.0.1:2181");
        zookeeper.setData("/test","mydata-set".getBytes(),-1);
        System.out.println(zookeeper.getData("/test",false,new Stat()));
    }