ZooKeeper的java客户端api基本功能代码
ZooKeeper的java客户端api基本功能代码package cn.edu360.zk.demo;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.List;import org.apache.zookeeper.CreateMode;import or...
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ZooKeeper的java客户端api基本功能代码
package cn.edu360.zk.demo;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;
import org.junit.Before;
import org.junit.Test;
public class ZookepperClientDemo {
ZooKeeper zk = null;
@Before
public void init() throws Exception {
zk = new ZooKeeper("hadoop1:2181,hadoop2:2181,hadoop3:2181", 2000, null);
}
@Test
public void testCreate() throws Exceptaion {
//构造一个连接zookeeper的客户端对象
//参数1:要创建节点路径 参数2:数据 参数3:访问权限 参数4:节点类型
String create = zk.create("/eclipse", "hello eclipse".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
System.out.println(create);
zk.close();
}
@Test
public void testUpdate() throws Exception, KeeperException, InterruptedException {
//参数1:节点路径 参数2:数据 参数3:要修改的版本 ,-1代表任何版本
Stat stat = zk.setData("/eclipse", "我爱你".getBytes("UTF-8"), -1);
zk.close();
}
@Test
public void testGet() throws Exception{
//参数1:节点路径 参数2:是否要监听 参数3 :所要获取的版本,null表示最新的版本
byte[] data = zk.getData("/eclipse", false, null);
System.out.println(new String(data,"UTF-8"));
zk.close();
}
@Test
public void testListChildern() throws Exception{
//参数1:节点路径 参数2:是否要监听 ;
//注意返回的结果只有节点的名字,没有全路径;
List<String> children = zk.getChildren("/cc", false);
for (String child : children) {
System.out.println(child);
}
zk.close();
}
@Test
public void testRm() throws Exception{
//参数1:节点路径 参数2:版本
zk.delete("/eclipse", -1);
zk.close();
}
}
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