java连接zookeeper的3种方式

- 日理万妓 2022-02-25 03:26 238阅读 0赞

**1、使用zookeeper原始api**

public class Demo {
    
        private static String ip = "192.168.0.101:2181";
    
        private static int  session_timeout = 40000;
    
        private static CountDownLatch latch = new CountDownLatch(1);
    
        public static void main(String[] args) throws Exception {
            ZooKeeper zooKeeper = new ZooKeeper(ip, session_timeout, new Watcher() {
                @Override
                public void process(WatchedEvent watchedEvent) {
                    if(watchedEvent.getState() == Event.KeeperState.SyncConnected) {
                        //确认已经连接完毕后再进行操作
                        latch.countDown();
                        System.out.println("已经获得了连接");
                    }
                }
            });
    
            //连接完成之前先等待
            latch.await();
            ZooKeeper.States states = zooKeeper.getState();
            System.out.println(states);
        }
    }

打印：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nbGVpMDgyMzE5_size_16_color_FFFFFF_t_70][]

如果打印出来的状态为  CONNECTED 则表示连接成功

**2、使用ZkClient客户端连接，这种连接比较简单**

public class ZkClientTest {
    
        private static String ip = "192.168.0.101:2181";
    
        private static int  session_timeout = 40000;
    
        public static void main(String[] args) {
            ZkClient zkClient = new ZkClient(ip,session_timeout);
            System.out.println(zkClient.getChildren("/"));
        }
    }

**    打印：**

**  **![20190331172648618.png][]

**3、  使用curator连接：**

public class CuratorDemo {
    
    
        //ZooKeeper服务地址
        private static final String SERVER = "192.168.0.101:2181";
    
        //会话超时时间
        private static final int SESSION_TIMEOUT = 30000;
    
        //连接超时时间
        private static final int CONNECTION_TIMEOUT = 5000;
    
        /**
         * baseSleepTimeMs：初始的重试等待时间
         * maxRetries：最多重试次数
         *
         *
         * ExponentialBackoffRetry：重试一定次数，每次重试时间依次递增
         * RetryNTimes：重试N次
         * RetryOneTime：重试一次
         * RetryUntilElapsed：重试一定时间
         */
        private static final RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
    
    
        public static void main(String[] args) throws Exception {
            //创建 CuratorFrameworkImpl实例
            CuratorFramework client = CuratorFrameworkFactory.newClient(SERVER, SESSION_TIMEOUT, CONNECTION_TIMEOUT, retryPolicy);
    
            //启动
            client.start();
    
            System.out.println("连接成功！");
            Object o = client.getChildren().forPath("/");
            System.out.println(o);
        }
    
    }

打印：

![20190331173410889.png][]

以上

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nbGVpMDgyMzE5_size_16_color_FFFFFF_t_70]: /images/20220225/802df04ac1fa4b149e3bdadf906010c5.png
[20190331172648618.png]: /images/20220225/e6687fb0f1364514905c6ecc3aaf4645.png
[20190331173410889.png]: /images/20220225/554153e0abd74705ba6704bd8a7dcecf.png