java-zookeeper
时间: 2023-11-29 12:46:43 浏览: 36
Java ZooKeeper是一个开源的分布式协调服务,它可以用于分布式应用程序中的配置管理,命名服务,分布式同步和提供组服务等。ZooKeeper提供了一个分层的命名空间,以及一组基本操作,如创建、删除、移动和设置节点的数据。ZooKeeper还提供了一些高级功能,如分布式锁和分布式队列。以下是Java ZooKeeper的基本节点CRUD操作的示例:
1.创建节点
```java
ZooKeeper zk = new ZooKeeper("localhost:2181", 3000, null);
String path = "/test";
byte[] data = "hello".getBytes();
CreateMode mode = CreateMode.PERSISTENT;
zk.create(path, data, ZooDefs.Ids.OPEN_ACL_UNSAFE, mode);
```
2.读取节点
```java
ZooKeeper zk = new ZooKeeper("localhost:2181", 3000, null);
String path = "/test";
byte[] data = zk.getData(path, false, null);
String result = new String(data);
System.out.println(result);
```
3.更新节点
```java
ZooKeeper zk = new ZooKeeper("localhost:2181", 3000, null);
String path = "/test";
byte[] data = "world".getBytes();
int version = zk.exists(path, false).getVersion();
zk.setData(path, data, version);
```
4.删除节点
```java
ZooKeeper zk = new ZooKeeper("localhost:2181", 3000, null);
String path = "/test";
int version = zk.exists(path, false).getVersion();
zk.delete(path, version);
```