zookeeper 基础操作

https://blog.csdn.net/wo541075754/article/details/68929512

1、maven依赖

<dependency>
     <groupId>org.apache.zookeeper</groupId>
     <artifactId>zookeeper</artifactId>
     <version>3.4.9</version>
 </dependency>
<dependency>
    <groupId>com.101tec</groupId>
    <artifactId>zkclient</artifactId>
    <version>0.10</version>
</dependency>

2、ZkClient会话方法：

public ZkClient(String serverstring)
public ZkClient(String zkServers, int connectionTimeout)
public ZkClient(String zkServers, int sessionTimeout, int connectionTimeout)
public ZkClient(String zkServers, int sessionTimeout, int connectionTimeout, ZkSerializer zkSerializer)
public ZkClient(final String zkServers, final int sessionTimeout, final int connectionTimeout, final ZkSerializer zkSerializer, final long operationRetryTimeout)
public ZkClient(IZkConnection connection)
public ZkClient(IZkConnection connection, int connectionTimeout)
public ZkClient(IZkConnection zkConnection, int connectionTimeout, ZkSerializer zkSerializer)
public ZkClient(final IZkConnection zkConnection, final int connectionTimeout, final ZkSerializer zkSerializer, final long operationRetryTimeout)

3、连接

import org.I0Itec.zkclient.ZkClient;

public class TestZkClient {
    public static void main(String[] args) {

        ZkClient zkClient = new ZkClient("127.0.0.1:2181", 5000);
        System.out.println("ZK 成功建立连接！");
    }
}

4、创建节点

public void createPersistent(String path)
public void createPersistent(String path, boolean createParents)
public void createPersistent(String path, boolean createParents, List<ACL> acl)
public void createPersistent(String path, Object data)
public void createPersistent(String path, Object data, List<ACL> acl)
public String createPersistentSequential(String path, Object data)
public String createPersistentSequential(String path, Object data, List<ACL> acl) 
public void createEphemeral(final String path)
public void createEphemeral(final String path, final List<ACL> acl)
public String create(final String path, Object data, final CreateMode mode)
public String create(final String path, Object data, final List<ACL> acl, final CreateMode mode) 
public void createEphemeral(final String path, final Object data)
public void createEphemeral(final String path, final Object data, final List<ACL> acl)
public String createEphemeralSequential(final String path, final Object data)
public String createEphemeralSequential(final String path, final Object data, final List<ACL> acl)

5、删除节点

public boolean delete(final String path)
public boolean delete(final String path, final int version)
public boolean deleteRecursive(String path)

6、获取节点列表

public List<String> getChildren(String path)

7、获取节点数据

public <T extends Object> T readData(String path)
public <T extends Object> T readData(String path, boolean returnNullIfPathNotExists)
public <T extends Object> T readData(String path, Stat stat)

8、更新节点数据

public void writeData(String path, Object object)
public void writeData(final String path, Object datat, final int expectedVersion)
public Stat writeDataReturnStat(final String path, Object datat, final int expectedVersion)

9、节点是否存在

protected boolean exists(final String path, final boolean watch)

10、临时节点和永久节点

临时节点会话关闭后就消失

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