目录
ZooKeeper简单介绍
一、安装zookeeper
二、springboot整合zookeeper
ZooKeeper简单介绍
zookeeper是为分布式应用程序提供的高性能协调服务。zookeeper将命名、配置管理、同步和组服务等常用服务公开在一个简单的接口中，因此用户无需从头开始编写这些服务。可以使用它来实现共识、组管理、领导者选举和存在协议。还可以在此基础上满足自己的特定需求。开始学习zookeeper：zookeeper官网
zookeeper和nacos、eureka、consul都是我们常见的微服务注册中心，这篇文章就详细地介绍一下springboot整合zookeeper的步骤。
一、安装zookeeper
为了方便使用zookeeper，我们在windows系统上安装zookeeper。
首先，需要下载zookeeper，点击链接打开zookeeper官网Apache ZooKeeper，在官网首页点击Getting Started下面的Download进入下载页面
选择下载稳定的版本
下载完成后，解压到D盘，然后打开刚刚解压的zookeeper安装目录下的config目录，复制一份zoo_sample.cfg，然后重命名为zoo.cfg，修改里面的内容，dataLogDir是新增的，原来文件里没有
dataDir：zookeeper的安装目录\\data
dataLogDir：zookeeper的安装目录\\log
tickTime=2000initLimit=10syncLimit=5clientPort=2181dataDir=D:\\program\\apache-zookeeper-3.7.1\\datadataLogDir=D:\\program\\apache-zookeeper-3.7.1\\log然后在安装目录下新建两个目录data和log
经过以上的步骤，zookeeper就算安装完了。
启动zookeeper：双击zookeeper安装目录下的zkServer.bat和zkCli.bat两个文件
二、springboot整合zookeeper
1、在IntelliJ IDEA里新建一个springboot项目，命名为zookeeper
2、在项目的pom.xml文件中引入zookeeper和相关依赖
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.5.9</version><relativePath/></parent><groupId>com.example</groupId><artifactId>zookeeper</artifactId><version>0.0.1-SNAPSHOT</version><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!--lombok--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.22</version></dependency><dependency><groupId>org.apache.zookeeper</groupId><artifactId>zookeeper</artifactId><version>3.7.0</version></dependency><dependency><groupId>org.apache.curator</groupId><artifactId>curator-framework</artifactId><version>5.2.1</version></dependency><dependency><groupId>org.apache.curator</groupId><artifactId>curator-recipes</artifactId><version>5.2.1</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>3、修改application.xml配置文件，只需要指定项目启动端口号和zookeeper的服务器地址
server:port: 8085zookeeper:host: localhost:21814、项目根目录下创建config包，新建一个zookeeper的配置类
package com.example.zookeeper.config;import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** @author heyunlin* @version 1.0*/
@Configuration
public class ZookeeperConfig {@Value("${zookeeper.host}")private String host;@Beanpublic CuratorFramework curatorFramework() {CuratorFramework curatorFramework = CuratorFrameworkFactory.builder().connectString(host).sessionTimeoutMs(5000).retryPolicy(new ExponentialBackoffRetry(500, 5)).build();curatorFramework.start();return curatorFramework;}}5、使用zookeeper的API
package com.example.zookeeper.controller;import com.example.zookeeper.restful.JsonResult;
import org.apache.curator.framework.CuratorFramework;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.data.Stat;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;import java.nio.charset.StandardCharsets;
import java.util.List;/*** @author heyunlin* @version 1.0*/
@RestController
@RequestMapping(path = "/zookeeper", produces = "application/json;charset=utf-8")
public class ZookeeperController {private final CuratorFramework curatorFramework;@Autowiredpublic ZookeeperController(CuratorFramework curatorFramework) {this.curatorFramework = curatorFramework;}/*** 判断znode是否存在* @param node 节点名称*/@RequestMapping(value = "/exist", method = RequestMethod.GET)public JsonResult<Stat> exist(String node) throws Exception {Stat stat = curatorFramework.checkExists().forPath(node);return JsonResult.success(null, stat);}/*** 创建一个znode* @param node 节点名称*/@RequestMapping(value = "/create", method = RequestMethod.GET)public JsonResult<Void> create(String node) throws Exception {curatorFramework.create().creatingParentContainersIfNeeded()/*创建模式：常用的有PERSISTENT：持久化节点，客户端与zookeeper断开连接后，该节点依旧存在，只要不手动删除，该节点就会永远存在。PERSISTENT_SEQUENTIAL：持久化顺序编号目录节点，客户端与zookeeper断开连接后，该节点依旧存在，只是zookeeper给该节点名称进行顺序编号。EPHEMERAL：临时目录节点，客户端与zookeeper断开连接后，该节点被删除。EPHEMERAL_SEQUENTIAL：临时顺序编号目录节点，客户端与zookeeper断开连接后，该节点被删除，只是zookeeper给该节点名称进行顺序编号。*/.withMode(CreateMode.EPHEMERAL).forPath(node);return JsonResult.success("创建成功");}/*** 设置znode节点的数据* @param node 节点名称* @param data 节点的数据*/@RequestMapping(value = "/setData", method = RequestMethod.GET)public JsonResult<Void> setData(String node, String data) throws Exception {curatorFramework.setData().forPath(node, data.getBytes(StandardCharsets.UTF_8));return JsonResult.success("设置成功");}/*** 删除节点* @param node 节点名称*/@RequestMapping(value = "/delete", method = RequestMethod.GET)public JsonResult<Void> delete(String node) throws Exception {curatorFramework.delete().forPath(node);return JsonResult.success("删除成功");}/*** 删除节点及其子节点的数据* @param node 节点名称*/@RequestMapping(value = "/deleteDeeply", method = RequestMethod.GET)public JsonResult<Void> deleteDeeply(String node) throws Exception {curatorFramework.delete().deletingChildrenIfNeeded().forPath(node);return JsonResult.success("删除成功");}/*** 获取节点的数据* @param node 节点名称*/@RequestMapping(value = "/getData", method = RequestMethod.GET)public JsonResult<String> getData(String node) throws Exception {byte[] bytes = curatorFramework.getData().forPath(node);return JsonResult.success(null, new String(bytes));}/*** 获取当前节点的子节点数据* @param node 节点名称*/@RequestMapping(value = "/getChildren", method = RequestMethod.GET)public JsonResult<List<String>> getChildren(String node) throws Exception {List<String> list = curatorFramework.getChildren().forPath(node);return JsonResult.success(null, list);}}好了，文章就分享到这里了~
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