java调用ZooKeeper API应用

一个风轻云淡

发布于 2022-11-13 11:22:52

72200

代码可运行

文章被收录于专栏：java学习javajava学习java

运行总次数：0

代码可运行

1．创建一个Maven工程

2．添加pom文件

 <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.8.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.10</version>
        </dependency>
    </dependencies>

创建ZooKeeper客户端

public class zookeeper {

    public final static String  connetString="192.168.231.136:2181";
    private static int sessionTimeout = 2000;
    public static  ZooKeeper getZookeeper() throws Exception {
//        创建ZooKeeper客户端
        ZooKeeper zooKeeper = new ZooKeeper(connetString, sessionTimeout, new Watcher() {
            @Override
            public void process(WatchedEvent watchedEvent) {

            }
        });
        return zooKeeper;
    }
}

创建子节点

 @Test
    public void test01() throws Exception {
        // 参数1：要创建的节点的路径；
        // 参数2：节点数据 ；
        // 参数3：节点权限 ；
        // 参数4：节点的类型
        ZooKeeper zookeeper = com.atguigu.zookeeper.getZookeeper();
        String s = zookeeper.create("/777888", "8888".getBytes(StandardCharsets.UTF_8),
                ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        System.out.println(s);
    }

获取子节点

   @Test
    public void getChild() throws Exception {
        ZooKeeper zookeeper = com.atguigu.zookeeper.getZookeeper();
        List<String> children = zookeeper.getChildren("/", true);
        for(String child:children)
        {
            System.out.println(child);
        }
    }

判断Znode是否存在

@Test
    public void exitTest() throws Exception {
        ZooKeeper zookeeper = com.atguigu.zookeeper.getZookeeper();
        Stat stat = zookeeper.exists("/idea", false);
        System.out.println(stat);
        System.out.println(stat == null ? "not exist" : "exist");
    }