博主介绍： ✌博主从事应用安全和大数据领域，有8年研发经验，5年面试官经验，Java技术专家✌

Java知识图谱点击链接：体系化学习Java（Java面试专题）

💕💕 感兴趣的同学可以收藏关注下 ，不然下次找不到哟💕💕

Zookeeper 从安装到应用_zookeeper


文章目录

  • 1、什么是 Zookeeper
  • 2、Zookeeper 的安装教程
  • 3、Zookeeper 的应用场景
  • 4、Zookeeper 实现了 CAP 理论
  • 5、Zookeeper 实现配置管理功能
  • 6、Zookeeper 实现简单的分布式锁


1、什么是 Zookeeper

Zookeeper 是一个开源的分布式协调服务，它提供了分布式系统中的一致性、可靠性、容错性等服务。Zookeeper 可以用于分布式应用程序中的配置管理、命名服务、分布式锁、分布式队列等场景。

2、Zookeeper 的安装教程

Zookeeper 官网 https://zookeeper.apache.org/releases.html#news，点击页面上方的“Download”按钮，进入下载页面。

或者linux 在下载，使用命令行下载Zookeeper压缩包，命令如下：

wget https://downloads.apache.org/zookeeper/zookeeper-3.7.1/apache-zookeeper-3.7.1-bin.tar.gz

下载日志

[root@ecs-32f7 software]# wget https://downloads.apache.org/zookeeper/zookeeper-3.7.1/apache-zookeeper-3.7.1-bin.tar.gz
--2023-06-26 17:20:35--  https://downloads.apache.org/zookeeper/zookeeper-3.7.1/apache-zookeeper-3.7.1-bin.tar.gz
Resolving downloads.apache.org (downloads.apache.org)... 88.99.95.219, 135.181.214.104, 2a01:4f9:3a:2c57::2, ...
Connecting to downloads.apache.org (downloads.apache.org)|88.99.95.219|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 12649765 (12M) [application/x-gzip]
Saving to: ‘apache-zookeeper-3.7.1-bin.tar.gz’

100%[===================================================================================================================================>] 12,649,765  2.00MB/s   in 6.0s

2023-06-26 17:20:44 (2.00 MB/s) - ‘apache-zookeeper-3.7.1-bin.tar.gz’ saved [12649765/12649765]

[root@ecs-32f7 software]#

然后解压

tar -zxvf /root/software/apache-zookeeper-3.7.1-bin.tar.gz

进入根目录

cd apache-zookeeper-3.7.1-bin/

修改配置文件

mv conf/zoo_sample.cfg conf/zoo.cfg
vim conf/zoo.cfg

修改日志存储位置

dataDir=/root/software/apache-zookeeper-3.7.1-bin/logs
clientPort=2181
admin.serverPort=16000

启动命令

bin/zkServer.sh start

启动标识

ZooKeeper JMX enabled by default
Using config: /root/software/apache-zookeeper-3.7.1-bin/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@ecs-32f7 apache-zookeeper-3.7.1-bin]#

如果装了 java 的，也可以通过 jps 查看是否启动

[root@ecs-32f7 apache-zookeeper-3.7.1-bin]# jps
17266 QuorumPeerMain

3、Zookeeper 的应用场景

Zookeeper 的应用场景非常广泛，以下是一些常见的应用场景：

  1. 配置管理：Zookeeper 可以用于管理分布式系统中的配置信息，例如 Hadoop 集群的配置信息。
  2. 命名服务：Zookeeper 可以用于实现分布式系统中的命名服务，例如 Hadoop 集群中的 NameNode。
  3. 分布式锁：Zookeeper 可以用于实现分布式锁，保证分布式系统中的数据一致性。
  4. 分布式队列：Zookeeper 可以用于实现分布式队列，例如 Kafka 中的消费者组协调。
  5. 集群管理：Zookeeper 可以用于实现集群管理，例如 Hadoop 集群中的ResourceManager。

总之，Zookeeper 可以用于任何需要分布式协调的场景，它提供了一种简单而强大的方式来管理分布式系统中的状态信息。

4、Zookeeper 实现了 CAP 理论

Zookeeper 实现了 CAP 理论中的 CP 模型，即一致性和分区容错性。在分布式系统中，由于网络分区等原因，可能会出现节点之间的通信故障，这时候需要保证系统的一致性。Zookeeper 通过使用 Paxos 算法来保证分布式系统中的一致性，同时通过多数派原则来保证分区容错性。因此，Zookeeper 可以保证系统的一致性和分区容错性，而牺牲了可用性。

5、Zookeeper 实现配置管理功能

pom.xml 先引入

<!-- zookeeper -->
<dependency>
    <groupId>org.apache.zookeeper</groupId>
    <artifactId>zookeeper</artifactId>
    <version>3.6.2</version>
</dependency>

下面是利用 zookeeper 的节点存储配置信息：

package com.pany.camp.zookeeper;

import org.apache.zookeeper.*;
import org.apache.zookeeper.data.Stat;

import java.io.IOException;

/**
 * @description: Zookeeper 配置管理功能
 * @copyright: @Copyright (c) 2022
 * @company: Aiocloud
 * @author: pany
 * @version: 1.0.0
 * @createTime: 2023-06-26 20:12
 */
public class ConfigManager {
    private ZooKeeper zooKeeper;

    public ConfigManager() throws IOException, KeeperException, InterruptedException {
        zooKeeper = new ZooKeeper("localhost:2181", 5000, null);
        init();
    }

    private void init() throws KeeperException, InterruptedException {
        String path = "/config";
        String data = "hello world";
        Stat stat = zooKeeper.exists(path, false);
        if (stat == null) {
            zooKeeper.create(path, data.getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
        }
    }

    public String getConfig() throws KeeperException, InterruptedException {
        String path = "/config";
        byte[] data = zooKeeper.getData(path, false, null);
        return new String(data);
    }

    public void updateConfig(String config) throws KeeperException, InterruptedException {
        String path = "/config";
        zooKeeper.setData(path, config.getBytes(), -1);
    }

    public void deleteConfig() throws KeeperException, InterruptedException {
        String path = "/config";
        zooKeeper.delete(path, -1);
    }

    public void close() throws InterruptedException {
        zooKeeper.close();
    }

    public static void main(String[] args) throws IOException, KeeperException, InterruptedException {
        ConfigManager configManager = new ConfigManager();

        String config = configManager.getConfig();
        System.out.println("Config: " + config);

        configManager.updateConfig("hello zookeeper");
        config = configManager.getConfig();
        System.out.println("Config: " + config);

        configManager.deleteConfig();
        config = configManager.getConfig();
        System.out.println("Config: " + config);

        configManager.close();
    }
}

输出如下，因为 /config 最后被删除了，所以 getConfig() 便抛出异常。

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/software/apache-maven-3.2.3/.m2/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/software/apache-maven-3.2.3/.m2/org/slf4j/slf4j-log4j12/1.7.25/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
20:27:05.831 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:zookeeper.version=3.6.2--803c7f1a12f85978cb049af5e4ef23bd8b688715, built on 09/04/2020 12:44 GMT
20:27:05.836 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:host.name=pany
20:27:05.839 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.version=1.8.0_201
20:27:05.839 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.vendor=Oracle Corporation
20:27:05.839 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.home=D:\software\jdk\jre
20:27:05.839 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.class.path=D:\software\jdk\jre\lib\charsets.jar;D:\software\jdk\jre\lib\deploy.jar;D:\software\jdk\jre\lib\ext\access-bridge-64.jar;D:\software\jdk\jre\lib\ext\cldrdata.jar;D:\software\jdk\jre\lib\ext\dnsns.jar;D:\software\jdk\jre\lib\ext\jaccess.jar;D:\software\jdk\jre\lib\ext\jfxrt.jar;D:\software\jdk\jre\lib\ext\localedata.jar;D:\software\jdk\jre\lib\ext\nashorn.jar;D:\software\jdk\jre\lib\ext\sunec.jar;D:\software\jdk\jre\lib\ext\sunjce_provider.jar;D:\software\jdk\jre\lib\ext\sunmscapi.jar;D:\software\jdk\jre\lib\ext\sunpkcs11.jar;D:\software\jdk\jre\lib\ext\zipfs.jar;D:\software\jdk\jre\lib\javaws.jar;D:\software\jdk\jre\lib\jce.jar;D:\software\jdk\jre\lib\jfr.jar;D:\software\jdk\jre\lib\jfxswt.jar;D:\software\jdk\jre\lib\jsse.jar;D:\software\jdk\jre\lib\management-agent.jar;D:\software\jdk\jre\lib\plugin.jar;D:\software\jdk\jre\lib\resources.jar;D:\software\jdk\jre\lib\rt.jar;D:\software\idea\codeSpace\sourceCode\java-study\target\classes;D:\software\idea\codeSpace\sourceCode\java-study\src\main\resources\libs\lz4-1.3.0.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-actuator\2.1.2.RELEASE\spring-boot-starter-actuator-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-actuator-autoconfigure\2.1.2.RELEASE\spring-boot-actuator-autoconfigure-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-actuator\2.1.2.RELEASE\spring-boot-actuator-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\com\fasterxml\jackson\core\jackson-databind\2.9.8\jackson-databind-2.9.8.jar;D:\software\apache-maven-3.2.3\.m2\com\fasterxml\jackson\core\jackson-core\2.9.8\jackson-core-2.9.8.jar;D:\software\apache-maven-3.2.3\.m2\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.8\jackson-datatype-jsr310-2.9.8.jar;D:\software\apache-maven-3.2.3\.m2\io\micrometer\micrometer-core\1.1.2\micrometer-core-1.1.2.jar;D:\software\apache-maven-3.2.3\.m2\org\hdrhistogram\HdrHistogram\2.1.9\HdrHistogram-2.1.9.jar;D:\software\apache-maven-3.2.3\.m2\org\latencyutils\LatencyUtils\2.0.3\LatencyUtils-2.0.3.jar;D:\software\apache-maven-3.2.3\.m2\net\bytebuddy\byte-buddy\1.9.7\byte-buddy-1.9.7.jar;D:\software\apache-maven-3.2.3\.m2\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-core\5.1.4.RELEASE\spring-core-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-jcl\5.1.4.RELEASE\spring-jcl-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter\2.1.2.RELEASE\spring-boot-starter-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot\2.1.2.RELEASE\spring-boot-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-logging\2.1.2.RELEASE\spring-boot-starter-logging-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\software\apache-maven-3.2.3\.m2\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\logging\log4j\log4j-to-slf4j\2.11.1\log4j-to-slf4j-2.11.1.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\logging\log4j\log4j-api\2.11.1\log4j-api-2.11.1.jar;D:\software\apache-maven-3.2.3\.m2\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;D:\software\apache-maven-3.2.3\.m2\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;D:\software\apache-maven-3.2.3\.m2\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-autoconfigure\2.1.2.RELEASE\spring-boot-autoconfigure-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-jdbc\2.1.2.RELEASE\spring-boot-starter-jdbc-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\com\zaxxer\HikariCP\3.2.0\HikariCP-3.2.0.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-jdbc\5.1.4.RELEASE\spring-jdbc-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-beans\5.1.4.RELEASE\spring-beans-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-configuration-processor\2.1.2.RELEASE\spring-boot-configuration-processor-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-web\2.1.2.RELEASE\spring-boot-starter-web-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-json\2.1.2.RELEASE\spring-boot-starter-json-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.8\jackson-datatype-jdk8-2.9.8.jar;D:\software\apache-maven-3.2.3\.m2\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.8\jackson-module-parameter-names-2.9.8.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-tomcat\2.1.2.RELEASE\spring-boot-starter-tomcat-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\tomcat\embed\tomcat-embed-core\9.0.14\tomcat-embed-core-9.0.14.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\tomcat\embed\tomcat-embed-el\9.0.14\tomcat-embed-el-9.0.14.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.14\tomcat-embed-websocket-9.0.14.jar;D:\software\apache-maven-3.2.3\.m2\org\hibernate\validator\hibernate-validator\6.0.14.Final\hibernate-validator-6.0.14.Final.jar;D:\software\apache-maven-3.2.3\.m2\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;D:\software\apache-maven-3.2.3\.m2\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-web\5.1.4.RELEASE\spring-web-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-webmvc\5.1.4.RELEASE\spring-webmvc-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-expression\5.1.4.RELEASE\spring-expression-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\mybatis\spring\boot\mybatis-spring-boot-starter\1.1.1\mybatis-spring-boot-starter-1.1.1.jar;D:\software\apache-maven-3.2.3\.m2\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\1.1.1\mybatis-spring-boot-autoconfigure-1.1.1.jar;D:\software\apache-maven-3.2.3\.m2\org\mybatis\mybatis\3.4.0\mybatis-3.4.0.jar;D:\software\apache-maven-3.2.3\.m2\org\mybatis\mybatis-spring\1.3.0\mybatis-spring-1.3.0.jar;D:\software\apache-maven-3.2.3\.m2\junit\junit\4.12\junit-4.12.jar;D:\software\apache-maven-3.2.3\.m2\io\springfox\springfox-swagger2\2.9.2\springfox-swagger2-2.9.2.jar;D:\software\apache-maven-3.2.3\.m2\io\swagger\swagger-annotations\1.5.20\swagger-annotations-1.5.20.jar;D:\software\apache-maven-3.2.3\.m2\io\swagger\swagger-models\1.5.20\swagger-models-1.5.20.jar;D:\software\apache-maven-3.2.3\.m2\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;D:\software\apache-maven-3.2.3\.m2\io\springfox\springfox-spi\2.9.2\springfox-spi-2.9.2.jar;D:\software\apache-maven-3.2.3\.m2\io\springfox\springfox-core\2.9.2\springfox-core-2.9.2.jar;D:\software\apache-maven-3.2.3\.m2\io\springfox\springfox-schema\2.9.2\springfox-schema-2.9.2.jar;D:\software\apache-maven-3.2.3\.m2\io\springfox\springfox-swagger-common\2.9.2\springfox-swagger-common-2.9.2.jar;D:\software\apache-maven-3.2.3\.m2\io\springfox\springfox-spring-web\2.9.2\springfox-spring-web-2.9.2.jar;D:\software\apache-maven-3.2.3\.m2\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;D:\software\apache-maven-3.2.3\.m2\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\plugin\spring-plugin-core\1.2.0.RELEASE\spring-plugin-core-1.2.0.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\plugin\spring-plugin-metadata\1.2.0.RELEASE\spring-plugin-metadata-1.2.0.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\mapstruct\mapstruct\1.2.0.Final\mapstruct-1.2.0.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\springfox\springfox-swagger-ui\2.9.2\springfox-swagger-ui-2.9.2.jar;D:\software\apache-maven-3.2.3\.m2\com\alibaba\fastjson\1.2.31\fastjson-1.2.31.jar;D:\software\apache-maven-3.2.3\.m2\com\github\ulisesbocchio\jasypt-spring-boot-starter\2.1.1\jasypt-spring-boot-starter-2.1.1.jar;D:\software\apache-maven-3.2.3\.m2\com\github\ulisesbocchio\jasypt-spring-boot\2.1.1\jasypt-spring-boot-2.1.1.jar;D:\software\apache-maven-3.2.3\.m2\com\melloware\jasypt\1.9.4\jasypt-1.9.4.jar;D:\software\apache-maven-3.2.3\.m2\com\alibaba\druid\1.0.29\druid-1.0.29.jar;D:\software\jdk\lib\jconsole.jar;D:\software\jdk\lib\tools.jar;D:\software\apache-maven-3.2.3\.m2\mysql\mysql-connector-java\8.0.13\mysql-connector-java-8.0.13.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-thymeleaf\2.1.2.RELEASE\spring-boot-starter-thymeleaf-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\thymeleaf\thymeleaf-spring5\3.0.11.RELEASE\thymeleaf-spring5-3.0.11.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\thymeleaf\thymeleaf\3.0.11.RELEASE\thymeleaf-3.0.11.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\attoparser\attoparser\2.0.5.RELEASE\attoparser-2.0.5.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\unbescape\unbescape\1.1.6.RELEASE\unbescape-1.1.6.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\thymeleaf\extras\thymeleaf-extras-java8time\3.0.2.RELEASE\thymeleaf-extras-java8time-3.0.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\httpcomponents\httpclient\4.5.9\httpclient-4.5.9.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\httpcomponents\httpcore\4.4.10\httpcore-4.4.10.jar;D:\software\apache-maven-3.2.3\.m2\commons-codec\commons-codec\1.11\commons-codec-1.11.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-core\1.8.0\shiro-core-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-lang\1.8.0\shiro-lang-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-cache\1.8.0\shiro-cache-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-crypto-hash\1.8.0\shiro-crypto-hash-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-crypto-core\1.8.0\shiro-crypto-core-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-crypto-cipher\1.8.0\shiro-crypto-cipher-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-config-core\1.8.0\shiro-config-core-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-config-ogdl\1.8.0\shiro-config-ogdl-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\commons-beanutils\commons-beanutils\1.9.4\commons-beanutils-1.9.4.jar;D:\software\apache-maven-3.2.3\.m2\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-event\1.8.0\shiro-event-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-spring\1.8.0\shiro-spring-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\shiro\shiro-web\1.8.0\shiro-web-1.8.0.jar;D:\software\apache-maven-3.2.3\.m2\org\owasp\encoder\encoder\1.2.2\encoder-1.2.2.jar;D:\software\apache-maven-3.2.3\.m2\com\github\penggle\kaptcha\2.3.2\kaptcha-2.3.2.jar;D:\software\apache-maven-3.2.3\.m2\javax\servlet\javax.servlet-api\4.0.1\javax.servlet-api-4.0.1.jar;D:\software\apache-maven-3.2.3\.m2\com\jhlabs\filters\2.0.235-1\filters-2.0.235-1.jar;D:\software\apache-maven-3.2.3\.m2\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;D:\software\apache-maven-3.2.3\.m2\com\github\pagehelper\pagehelper-spring-boot-starter\1.2.5\pagehelper-spring-boot-starter-1.2.5.jar;D:\software\apache-maven-3.2.3\.m2\com\github\pagehelper\pagehelper-spring-boot-autoconfigure\1.2.5\pagehelper-spring-boot-autoconfigure-1.2.5.jar;D:\software\apache-maven-3.2.3\.m2\com\github\pagehelper\pagehelper\5.1.10\pagehelper-5.1.10.jar;D:\software\apache-maven-3.2.3\.m2\com\github\jsqlparser\jsqlparser\2.0\jsqlparser-2.0.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-mail\2.1.2.RELEASE\spring-boot-starter-mail-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-context-support\5.1.4.RELEASE\spring-context-support-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\com\sun\mail\javax.mail\1.6.2\javax.mail-1.6.2.jar;D:\software\apache-maven-3.2.3\.m2\javax\activation\activation\1.1\activation-1.1.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-aop\2.1.2.RELEASE\spring-boot-starter-aop-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-aop\5.1.4.RELEASE\spring-aop-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\aspectj\aspectjweaver\1.9.2\aspectjweaver-1.9.2.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-all\4.1.77.Final\netty-all-4.1.77.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-buffer\4.1.31.Final\netty-buffer-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec\4.1.31.Final\netty-codec-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-dns\4.1.31.Final\netty-codec-dns-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-haproxy\4.1.31.Final\netty-codec-haproxy-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-http\4.1.31.Final\netty-codec-http-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-http2\4.1.31.Final\netty-codec-http2-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-memcache\4.1.31.Final\netty-codec-memcache-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-mqtt\4.1.31.Final\netty-codec-mqtt-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-redis\4.1.31.Final\netty-codec-redis-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-smtp\4.1.31.Final\netty-codec-smtp-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-socks\4.1.31.Final\netty-codec-socks-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-stomp\4.1.31.Final\netty-codec-stomp-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-codec-xml\4.1.31.Final\netty-codec-xml-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-common\4.1.31.Final\netty-common-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-handler\4.1.31.Final\netty-handler-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-handler-proxy\4.1.31.Final\netty-handler-proxy-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-resolver\4.1.31.Final\netty-resolver-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-resolver-dns\4.1.31.Final\netty-resolver-dns-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport\4.1.31.Final\netty-transport-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-rxtx\4.1.31.Final\netty-transport-rxtx-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-sctp\4.1.31.Final\netty-transport-sctp-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-udt\4.1.31.Final\netty-transport-udt-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-classes-epoll\4.1.77.Final\netty-transport-classes-epoll-4.1.77.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-native-unix-common\4.1.31.Final\netty-transport-native-unix-common-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-classes-kqueue\4.1.77.Final\netty-transport-classes-kqueue-4.1.77.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-resolver-dns-classes-macos\4.1.77.Final\netty-resolver-dns-classes-macos-4.1.77.Final.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-native-epoll\4.1.31.Final\netty-transport-native-epoll-4.1.31.Final-linux-x86_64.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-native-epoll\4.1.77.Final\netty-transport-native-epoll-4.1.77.Final-linux-aarch_64.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-native-kqueue\4.1.31.Final\netty-transport-native-kqueue-4.1.31.Final-osx-x86_64.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-native-kqueue\4.1.77.Final\netty-transport-native-kqueue-4.1.77.Final-osx-aarch_64.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-resolver-dns-native-macos\4.1.77.Final\netty-resolver-dns-native-macos-4.1.77.Final-osx-x86_64.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-resolver-dns-native-macos\4.1.77.Final\netty-resolver-dns-native-macos-4.1.77.Final-osx-aarch_64.jar;D:\software\apache-maven-3.2.3\.m2\com\google\code\gson\gson\2.9.0\gson-2.9.0.jar;D:\software\apache-maven-3.2.3\.m2\com\google\guava\guava\21.0\guava-21.0.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-devtools\2.1.2.RELEASE\spring-boot-devtools-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\commons\commons-compress\1.21\commons-compress-1.21.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\zookeeper\zookeeper\3.6.2\zookeeper-3.6.2.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\zookeeper\zookeeper-jute\3.6.2\zookeeper-jute-3.6.2.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\yetus\audience-annotations\0.5.0\audience-annotations-0.5.0.jar;D:\software\apache-maven-3.2.3\.m2\io\netty\netty-transport-native-epoll\4.1.31.Final\netty-transport-native-epoll-4.1.31.Final.jar;D:\software\apache-maven-3.2.3\.m2\org\slf4j\slf4j-log4j12\1.7.25\slf4j-log4j12-1.7.25.jar;D:\software\apache-maven-3.2.3\.m2\log4j\log4j\1.2.17\log4j-1.2.17.jar;D:\software\apache-maven-3.2.3\.m2\org\openjdk\jol\jol-core\0.16\jol-core-0.16.jar;D:\software\apache-maven-3.2.3\.m2\com\carrotsearch\java-sizeof\0.0.3\java-sizeof-0.0.3.jar;D:\software\apache-maven-3.2.3\.m2\cn\hutool\hutool-all\5.8.11\hutool-all-5.8.11.jar;D:\software\apache-maven-3.2.3\.m2\com\hankcs\hanlp\portable-1.8.1\hanlp-portable-1.8.1.jar;D:\software\apache-maven-3.2.3\.m2\org\jsoup\jsoup\1.13.1\jsoup-1.13.1.jar;D:\software\apache-maven-3.2.3\.m2\redis\clients\jedis\3.7.0\jedis-3.7.0.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\commons\commons-pool2\2.6.0\commons-pool2-2.6.0.jar;D:\software\apache-maven-3.2.3\.m2\org\bouncycastle\bcprov-jdk15on\1.68\bcprov-jdk15on-1.68.jar;D:\software\apache-maven-3.2.3\.m2\org\bouncycastle\bcpkix-jdk15on\1.68\bcpkix-jdk15on-1.68.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\boot\spring-boot-starter-data-redis\2.1.2.RELEASE\spring-boot-starter-data-redis-2.1.2.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\data\spring-data-redis\2.1.4.RELEASE\spring-data-redis-2.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\data\spring-data-keyvalue\2.1.4.RELEASE\spring-data-keyvalue-2.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\data\spring-data-commons\2.1.4.RELEASE\spring-data-commons-2.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-oxm\5.1.4.RELEASE\spring-oxm-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\io\lettuce\lettuce-core\5.1.3.RELEASE\lettuce-core-5.1.3.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\io\projectreactor\reactor-core\3.2.5.RELEASE\reactor-core-3.2.5.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\reactivestreams\reactive-streams\1.0.2\reactive-streams-1.0.2.jar;D:\software\apache-maven-3.2.3\.m2\org\apache\kafka\kafka-clients\2.8.0\kafka-clients-2.8.0.jar;D:\software\apache-maven-3.2.3\.m2\com\github\luben\zstd-jni\1.4.9-1\zstd-jni-1.4.9-1.jar;D:\software\apache-maven-3.2.3\.m2\org\lz4\lz4-java\1.7.1\lz4-java-1.7.1.jar;D:\software\apache-maven-3.2.3\.m2\org\xerial\snappy\snappy-java\1.1.8.1\snappy-java-1.1.8.1.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\kafka\spring-kafka\2.7.2\spring-kafka-2.7.2.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-context\5.1.4.RELEASE\spring-context-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-messaging\5.1.4.RELEASE\spring-messaging-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\spring-tx\5.1.4.RELEASE\spring-tx-5.1.4.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\springframework\retry\spring-retry\1.2.3.RELEASE\spring-retry-1.2.3.RELEASE.jar;D:\software\apache-maven-3.2.3\.m2\org\jetbrains\kotlin\kotlin-stdlib\1.2.71\kotlin-stdlib-1.2.71.jar;D:\software\apache-maven-3.2.3\.m2\org\jetbrains\kotlin\kotlin-stdlib-common\1.2.71\kotlin-stdlib-common-1.2.71.jar;D:\software\apache-maven-3.2.3\.m2\org\jetbrains\annotations\13.0\annotations-13.0.jar;D:\software\apache-maven-3.2.3\.m2\com\google\code\findbugs\jsr305\3.0.2\jsr305-3.0.2.jar;D:\software\idea\IntelliJ IDEA 2021.3.3\lib\idea_rt.jar
20:27:05.839 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.library.path=D:\software\jdk\bin;C:\windows\Sun\Java\bin;C:\windows\system32;C:\windows;C:\Python310\Scripts\;C:\Python310\;C:\windows\system32;C:\windows;C:\windows\System32\Wbem;C:\windows\System32\WindowsPowerShell\v1.0\;C:\windows\System32\OpenSSH\;D:\software\jdk\bin;D:\software\jdk\jre\bin;D:\software\scala\scala-2.12.8\bin;D:\software\gradle\gradle-5.4.1\bin;D:\software\xshell\;D:\software\xftp\;C:\Program Files\Git\cmd;C:\ProgramData\chocolatey\bin;D:\software\nodejs\node14\node_global;D:\software\nodejs\node14;D:\software\nodejs\node-v16.15.1-win-x64\node_global\node_modules\yarn;D:\software\apache-maven-3.5.4\bin;D:\software\nodejs\node14\;;D:\software\微信开发\微信web开发者工具\dll;D:\software\GoLang\bin;c:\Program Files (x86)\Microsoft SQL Server\90\Tools\binn\;C:\Users\py_wo\AppData\Local\Microsoft\WindowsApps;C:\Users\py_wo\AppData\Roaming\npm;C:\Users\py_wo\go\bin;D:\software\vscode\Microsoft VS Code\bin;.
20:27:05.839 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.io.tmpdir=C:\Users\py_wo\AppData\Local\Temp\
20:27:05.839 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:java.compiler=<NA>
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:os.name=Windows 10
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:os.arch=amd64
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:os.version=10.0
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:user.name=py_wo
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:user.home=C:\Users\py_wo
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:user.dir=D:\software\idea\codeSpace\sourceCode\java-study
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:os.memory.free=219MB
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:os.memory.max=3486MB
20:27:05.840 [main] INFO org.apache.zookeeper.ZooKeeper - Client environment:os.memory.total=236MB
20:27:05.847 [main] INFO org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=localhost:2181 sessionTimeout=5000 watcher=com.pany.camp.zookeeper.ConfigManager$1@1c53fd30
20:27:05.857 [main] INFO org.apache.zookeeper.common.X509Util - Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation
20:27:06.295 [main] INFO org.apache.zookeeper.ClientCnxnSocket - jute.maxbuffer value is 1048575 Bytes
20:27:06.309 [main] INFO org.apache.zookeeper.ClientCnxn - zookeeper.request.timeout value is 0. feature enabled=false
20:27:06.315 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.SaslServerPrincipal - Canonicalized address to localhost
20:27:06.317 [main-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server localhost/127.0.0.1:2181.
20:27:06.317 [main-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - SASL config status: Will not attempt to authenticate using SASL (unknown error)
20:27:06.319 [main-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - Socket connection established, initiating session, client: /127.0.0.1:64707, server: localhost/127.0.0.1:2181
20:27:06.320 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Session establishment request sent on localhost/127.0.0.1:2181
20:27:06.332 [main-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - Session establishment complete on server localhost/127.0.0.1:2181, session id = 0x1004edd1a400001, negotiated timeout = 5000
20:27:06.340 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 1,3  replyHeader:: 1,11,-101  request:: '/config,F  response::  
20:27:06.354 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 2,1  replyHeader:: 2,12,0  request:: '/config,#68656c6c6f20776f726c64,v{s{31,s{'world,'anyone}}},0  response:: '/config 
20:27:06.359 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 3,3  replyHeader:: 3,12,0  request:: '/config,F  response:: s{12,12,1687782426351,1687782426351,0,0,0,0,11,0,12} 
20:27:06.362 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 4,4  replyHeader:: 4,12,0  request:: '/config,F  response:: #68656c6c6f20776f726c64,s{12,12,1687782426351,1687782426351,0,0,0,0,11,0,12} 
Config: hello world
20:27:06.454 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 5,5  replyHeader:: 5,13,0  request:: '/config,#68656c6c6f207a6f6f6b6565706572,-1  response:: s{12,13,1687782426351,1687782426449,1,0,0,0,15,0,12} 
20:27:06.456 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 6,3  replyHeader:: 6,13,0  request:: '/config,F  response:: s{12,13,1687782426351,1687782426449,1,0,0,0,15,0,12} 
20:27:06.459 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 7,4  replyHeader:: 7,13,0  request:: '/config,F  response:: #68656c6c6f207a6f6f6b6565706572,s{12,13,1687782426351,1687782426449,1,0,0,0,15,0,12} 
Config: hello zookeeper
20:27:06.475 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 8,2  replyHeader:: 8,14,0  request:: '/config,-1  response:: null
20:27:06.477 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 9,3  replyHeader:: 9,14,-101  request:: '/config,F  response::  
20:27:06.478 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply session id: 0x1004edd1a400001, packet:: clientPath:null serverPath:null finished:false header:: 10,4  replyHeader:: 10,14,-101  request:: '/config,F  response::  
Exception in thread "main" org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /config
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:118)
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:54)
	at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:2358)
	at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:2385)
	at com.pany.camp.zookeeper.ConfigManager.getConfig(ConfigManager.java:41)
	at com.pany.camp.zookeeper.ConfigManager.main(ConfigManager.java:67)

Process finished with exit code 1

6、Zookeeper 实现简单的分布式锁

代码如下：

package com.pany.camp.zookeeper;

import com.pany.camp.redis.SeckillDemo;
import org.apache.commons.lang.StringUtils;
import org.apache.zookeeper.*;
import org.apache.zookeeper.data.Stat;
import redis.clients.jedis.Jedis;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CountDownLatch;

/**
 * @description: 分布式锁的简单实现
 * @copyright: @Copyright (c) 2022
 * @company: Aiocloud
 * @author: pany
 * @version: 1.0.0
 * @createTime: 2023-06-26 20:32
 */
public class DistributedLock {
    private ZooKeeper zk;
    private String lockPath;
    private String lockPrefix = "lock";
    private String lockName;

    public DistributedLock(String connectString, int sessionTimeout, String lockPath) throws Exception {
        this.zk = new ZooKeeper(connectString, sessionTimeout, null);
        this.lockPath = lockPath;
    }

    public void lock() throws KeeperException, InterruptedException {
        // 创建临时有序节点
        lockName = zk.create(lockPath + "/" + lockPrefix, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);

        // 获取 lockPath 下的所有节点
        List<String> lockNodes = zk.getChildren(lockPath, false);

        // 对所有节点进行排序
        Collections.sort(lockNodes);

        // 如果当前节点是序号最小的节点，则获取到锁
        if (lockName.equals(lockPath + "/" + lockNodes.get(0))) {
            return;
        }

        // 否则，监听当前节点的前一个节点
        String prevLockName = lockNodes.get(Collections.binarySearch(lockNodes, lockName.substring(lockPath.length() + 1)) - 1);
        final CountDownLatch latch = new CountDownLatch(1);
        Stat stat = zk.exists(lockPath + "/" + prevLockName, new Watcher() {
            @Override
            public void process(WatchedEvent event) {
                if (event.getType() == Event.EventType.NodeDeleted) {
                    latch.countDown();
                }
            }
        });

        // 等待前一个节点被删除
        if (stat != null) {
            latch.await();
        }
    }

    public void unlock() throws KeeperException, InterruptedException {
        // 删除当前节点
        zk.delete(lockName, -1);
    }

    public void close() throws InterruptedException {
        zk.close();
    }

    public static void main(String[] args) throws Exception {
        DistributedLock lock = new DistributedLock("localhost:2181", 5000, "/lock");
        lock.lock();
        try {
            System.out.println("获取到锁后执行操作");
        } finally {
            lock.unlock();
            lock.close();
        }
    }
}

Zookeeper 从安装到应用_分布式_02