临时节点,是zk的本次会话有效。分布式锁就是用临时节点做的。
import org.apache.zookeeper.*;
import java.util.concurrent.CountDownLatch;
public class ZookeeperBase {
static final String CONNECT_ADDR = "192.168.25.128:2181,192.168.25.130:2181,192.168.25.131:2181";
static final int SESSION_TIMEOUT = 5000;
static final CountDownLatch connectedLatch = new CountDownLatch(1);
public static void main(String[] args) throws Exception {
ZooKeeper zk = new ZooKeeper(CONNECT_ADDR, SESSION_TIMEOUT, new Watcher() {
@Override
public void process(WatchedEvent event) {
Event.KeeperState keeperState = event.getState();
Event.EventType eventType = event.getType();
if (Event.KeeperState.SyncConnected == keeperState) {
if (Event.EventType.None == eventType) {
System.out.println("zk建立连接");
connectedLatch.countDown();
}
}
}
});
connectedLatch.await();
System.out.println("主线程,继续执行");
String ret = zk.create("/testRoot", "testRoot".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
System.out.println(ret);
zk.close();
}
}