使用curator实现对zookeeper的增、删、改、查、回调

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Curator是Netflix公司开源的一套zookeeper客户端框架，解决了很多Zookeeper客户端非常底层的细节开发工作，里面提供了更多丰富的操作，例如session超时重连、主从选举、分布式计数器、分布式锁等等适用于各种复杂的zookeeper场景的API封装。

<dependency>    <groupId>org.apache.curator</groupId>    <artifactId>curator-framework</artifactId>    <version>2.11.0</version></dependency><dependency>    <groupId>org.apache.curator</groupId>    <artifactId>curator-recipes</artifactId>    <version>2.11.0</version></dependency>

public class CuratorClientUtils {    private static String ZK_URL = "192.168.1.45:2181,192.168.1.46:2181,192.168.1.41:2181";    private static CuratorFramework curatorFramework = null;    public static CuratorFramework getCuratorFramework(){        if (curatorFramework == null){            curatorFramework = CuratorFrameworkFactory.newClient(ZK_URL,                    5000,5000, new ExponentialBackoffRetry(1000,5));        }        curatorFramework.start();        return curatorFramework;    }}

public class CuratorApiDemo {    public static void main(String[] args) throws Exception {        CuratorFramework curatorFramework = CuratorClientUtils.getCuratorFramework();        //fluent模式,优雅的模式        /**         * 新增,递归创建,CreateMode.PERSISTENT 创建持久化节点（默认），         */        String path = curatorFramework.create().creatingParentsIfNeeded()                .withMode(CreateMode.PERSISTENT).forPath("/node/node1","123".getBytes());        System.out.println(path);        byte[] nodeBytes = curatorFramework.getData().forPath("/node");        System.out.println("node的值："+new String(nodeBytes));        /**         * 修改,如果第二个参数不填  会被修改为本机IP         */        curatorFramework.setData().forPath("/node/node1","node1".getBytes());        /**         * 获取stat信息         */        Stat stat=new Stat();        byte[] bytes = curatorFramework.getData().storingStatIn(stat).forPath("/node/node1");        System.out.println("修改后的值："+new String(bytes)+"-->"+stat);        /**         * 删除         */        Void aVoid = curatorFramework.delete().deletingChildrenIfNeeded().forPath("/node");        System.out.println(aVoid);        /**         * 事务操作（curator独有的）, 不会创建成功！         */        curatorFramework.inTransaction().create().withMode(CreateMode.PERSISTENT).forPath("/node","123".getBytes())        .and().setData().forPath("/curator","123".getBytes());        ExecutorService executorService = Executors.newFixedThreadPool(1);        curatorFramework.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT)                .inBackground(new BackgroundCallback() {                    public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {                        System.out.println("接收到watcher回调");                        System.out.println(Thread.currentThread().getName()+"->resultCode:"+curatorEvent.getResultCode()+"->"                                +curatorEvent.getType());                    }                },executorService).forPath("/node/node1");        System.in.read();    }}

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