zookeeper基本操作

雨点打透心脏的1/2处 2022-07-13 22:02 202阅读 0赞

## zookeeper基本操作 ##

#### 一、安装zookeeper ####

启动命令

bin/zookeeper-server-start.sh config/zookeeper.properties

#### 二、Maven依赖 ####

<dependency>
        <groupId>org.apache.curator</groupId>
        <artifactId>curator-framework</artifactId>
        <version>2.9.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.curator</groupId>
        <artifactId>curator-client</artifactId>
        <version>2.9.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.curator</groupId>
        <artifactId>curator-recipes</artifactId>
        <version>2.9.0</version>
    </dependency>

#### 三、zookeeper基本操作 ####

package zookeeper;
    
    import org.apache.curator.framework.CuratorFramework;
    import org.apache.curator.framework.CuratorFrameworkFactory;
    import org.apache.curator.retry.ExponentialBackoffRetry;
    import org.apache.curator.utils.ZKPaths;
    import org.apache.zookeeper.ZooKeeper;
    
    import java.nio.charset.Charset;
    
    /** * zookeeper 基本操作<br/> * Created by zhengyong on 16/11/24. */
    public class ZookeeperCURD { 
    
        private static final int        sessionTimeout = 15000;
        private static final String     ZK_HOST        = "127.0.0.1:2181";
        private static final String     ZK_PATH        = "/zkPath";
        private static CuratorFramework curatorClient  = null;
    
        public static void main(String[] args) throws Exception {
    
            createClient();
    
            create(ZK_PATH);
    
            setDataValue(ZK_PATH, "test data");
    
            getDataValue(ZK_PATH);
    
            delete(ZK_PATH);
    
        }
    
        /** * 创建zookeeper访问客户端 * * @throws Exception */
        private static void createClient() throws Exception {
    
            if (curatorClient == null) {
                synchronized (ZookeeperCURD.class) {
                    curatorClient = CuratorFrameworkFactory.builder().connectString(ZK_HOST).sessionTimeoutMs(sessionTimeout).retryPolicy(new ExponentialBackoffRetry(1000,
                                                                                                                                                                      10,
                                                                                                                                                                      5000)).build();
                    curatorClient.start();
                }
            }
        }
    
        /** * 创建zookeeper节点信息 * * @throws Exception */
        private static void create(String path) throws Exception {
            ZooKeeper zookeeper = new ZooKeeper(ZK_HOST, sessionTimeout, null);
            ZKPaths.mkdirs(zookeeper, path);
            System.out.println(String.format("create path=%s", path));
        }
    
        /** * 设置path node 值 * * @param path 路径 * @param data 值 * @throws Exception */
        private static void setDataValue(String path, String data) throws Exception {
            curatorClient.setData().forPath(path, data.getBytes(Charset.forName("UTf-8")));
            System.out.println(String.format("set path=%s, data=%s", path, data));
        }
    
        /** * 获取path node 值 * * @param path 路径 * @return 值 * @throws Exception */
        private static String getDataValue(String path) throws Exception {
            byte[] value = curatorClient.getData().forPath(path);
            String result = new String(value, Charset.forName("UTf-8"));
            System.out.println(String.format("get path=%s, data=%s", path, result));
            return result;
    
        }
    
        /** * 删除节点 * * @param path 路径 */
        private static void delete(String path) throws Exception {
            curatorClient.delete().forPath(path);
            System.out.println(String.format("delete path=%s", path));
        }
    }

运行结果：

create path=/zkPath
    set path=/zkPath, data=test data
    get path=/zkPath, data=test data
    delete path=/zkPath