Java的Zookeeper与分布式协调
Zookeeper是一个分布式服务协调框架,常用于实现分布式锁服务、配置管理、名字服务等。以下是一个简单的Java程序,使用Zookeeper API创建一个临时节点:
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.CreateMode;
public class ZookeeperExample {
private static final String CONNECTION_STRING = "localhost:2181";
private static final int SESSION_TIMEOUT = 2000;
private static final String ZNODE_PATH = "/my_temp_node";
public static void main(String[] args) {
ZooKeeper zookeeper = null;
try {
zookeeper = new ZooKeeper(CONNECTION_STRING, SESSION_TIMEOUT, event -> {});
// 创建临时节点
String result = zookeeper.create(ZNODE_PATH, "my_data".getBytes(),
ZooDefs.Ids.OPEN_ACL_UNSAFE,
CreateMode.EPHEMERAL);
System.out.println("Temporary node created with path: " + result);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (zookeeper != null) {
zookeeper.close();
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
这段代码展示了如何使用Zookeeper API在Zookeeper服务中创建一个临时节点。它首先建立与Zookeeper服务的连接,然后创建一个临时节点,并在控制台输出创建结果。在结束时,它关闭了Zookeeper会话。这个例子简单明了地展示了Zookeeper在Java分布式应用中的基本使用方法。
评论已关闭