Zookeeper JavaApi 增删改查

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官网API

http://zookeeper.apache.org/doc/r3.4.6/api/index.html

JAR包

\zookeeper-3.3.6\lib\
jline-0.9.94.jar

\zookeeper-3.3.6\lib\
log4j-1.2.15.jar

\zookeeper-3.3.6\
zookeeper-3.3.6.jar

Demo代码

注意代码中的注解

package hello.zookeeper.api;import java.util.List;import org.apache.zookeeper.CreateMode;import org.apache.zookeeper.WatchedEvent;import org.apache.zookeeper.Watcher;import org.apache.zookeeper.ZooDefs.Ids;import org.junit.Before;import org.junit.Test;import org.apache.zookeeper.ZooKeeper;public class ZkClient {/* * 此处必须与zookeeper的zoo.cfg中一样 * zk会选择一个连接 * 如果windows上运行，hosts也要配置一致 */private static final String connString="zk1:2181,zk2:2181,zk3:2181";/* * 超时：连接超时，同步时间间隔，zk有节点值变更，在这个时间内同步 */private static final int sessionTimeout=2000;private ZooKeeper zk=null;@Beforepublic void init() throws Exception{zk=new ZooKeeper(connString, sessionTimeout, new Watcher() {@Overridepublic void process(WatchedEvent event) {System.out.println("监听器："+event.getType()+"-"+event.getPath());}});}@Testpublic void create() throws Exception{String path="/eclipse";if(zk.exists(path, false)==null){String msg=zk.create(path, "helloworld".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);System.out.println("create："+msg);}else{System.out.println(path+"已存在！");}}@Testpublic void getChildren() throws Exception{List<String> children = zk.getChildren("/", true);if(children!=null&&children.size()>0){System.out.println("子目录如下：");for(String s:children){System.out.println(s);}}}@Testpublic void setData() throws Exception{//-1表示删除所有版本zk.setData("/eclipse", "hello earth !".getBytes(), -1);getData();}@Testpublic void getData() throws Exception{byte[] data = zk.getData("/eclipse", true, null);System.out.println("getData()："+new String(data));}@Testpublic void deleteZnode() throws Exception{zk.delete("/eclipse", -1);getChildren();}}

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