Java客户端如何进行操作_java培训
Java客户端操作
Maven工程和配置POM
<project xmlns=”http://maven.apache.org/POM/4.0.0″ xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
xsi:schemaLocation=”http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd”>
<modelVersion>4.0.0</modelVersion>
<groupId>com.atguigu.mall</groupId>
<artifactId>zk0919</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>zk0919</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!– https://mvnrepository.com/artifact/com.101tec/zkclient –>
<dependency>
<groupId>com.101tec</groupId>
<artifactId>zkclient</artifactId>
<version>0.10</version>
</dependency>
<!– https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper –>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.9</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.9</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
程序代码
package com.atguigu.zk3;
import java.io.IOException;
import org.apache.log4j.Logger;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Stat;
public class HelloZK
{
/**
* Logger for this class
*/
private static final Logger logger = Logger.getLogger(HelloZK.class);
private static final String CONNECTSTRING = “192.168.67.167:2181”;
private static final String PATH = “/atguigu”;
private static final int SESSION_TIMEOUT = 50*1000;
public ZooKeeper startZK() throws IOException
{
return new ZooKeeper(CONNECTSTRING, SESSION_TIMEOUT, new Watcher() {
@Override
public void process(WatchedEvent event)
{
}
});
}
public void stopZK(ZooKeeper zk) throws InterruptedException
{
if(zk != null)
{
zk.close();
}
}
public void createZNode(ZooKeeper zk,String path,String nodeValue) throws KeeperException, InterruptedException
{
zk.create(path,nodeValue.getBytes(),Ids.OPEN_ACL_UNSAFE,CreateMode.PERSISTENT);
}
public String getZNode(ZooKeeper zk,String path) throws KeeperException, InterruptedException
{
byte[] byteArray = zk.getData(path, false, new Stat());
return new String(byteArray);
}
public static void main(String[] args) throws IOException, KeeperException, InterruptedException
{
HelloZK hello = new HelloZK();
ZooKeeper zk = hello.startZK();
Stat stat = zk.exists(PATH, false);
if(stat == null)
{
hello.createZNode(zk, PATH, “zk1014”);
String result = hello.getZNode(zk, PATH);
System.out.println(“**********result: “+result);
}else{
System.out.println(“***********znode has already ok***********”);
}
hello.stopZK(zk);
}
}