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第 5 篇 : SpringBoot整合Zookeeper框架curator_curator在springboot中使用

作者：在线问答5 | 2024-08-01 00:07:03

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curator在springboot中使用

1. 在redis项目中,增加curator依赖,刷新maven

<!-- Netflix的curator-recipes -->
<dependency>
	<groupId>org.apache.curator</groupId>
	<artifactId>curator-recipes</artifactId>
	<version>5.2.0</version>
</dependency>

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2. 在application.yml文件中添加curator配置

zookeeper:
    connectString: 192.168.109.160:2181,192.168.109.161:2181,192.168.109.162:2181
    sessionTimeoutMs: 50000
    baseSleepTimeMs: 1000
    maxRetries: 3
    connectionTimeoutMs: 50000

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3. ZookeeperConfig,ZookeeperEnum,ZookeeperRequest

package com.hahashou.test.redis.config;

import lombok.Data;
import lombok.extern.slf4j.Slf4j;
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;

/**
 * @description: {@link CuratorFrameworkFactory}的builder模式(或者通过 .newClient(...) 静态方法)
 * @author: 哼唧兽
 * @date: 9999/9/21
 **/
@Configuration
@Data
@Slf4j
public class ZookeeperConfig {

    /** 集群地址 */
    @Value("${zookeeper.connectString}")
    private String connectString;

    /** 连接超时时间 */
    @Value("${zookeeper.connectionTimeoutMs}")
    private Integer connectionTimeoutMs;

    /** 会话超时时间 */
    @Value("${zookeeper.sessionTimeoutMs}")
    private Integer sessionTimeoutMs;

    /** 重试间隔等待的初试时间 */
    @Value("${zookeeper.baseSleepTimeMs}")
    private Integer baseSleepTimeMs;

    /** 最大重试次数 */
    @Value("${zookeeper.maxRetries}")
    private Integer maxRetries;

    /** 预定义的命名空间 */
    @Value("${zookeeper.namespace}")
    private String namespace;

    @Bean
    public CuratorFramework curatorFramework() {
        CuratorFramework curatorFramework = CuratorFrameworkFactory
                .builder()
                .connectString(connectString)
                .connectionTimeoutMs(connectionTimeoutMs)
                .sessionTimeoutMs(sessionTimeoutMs)
                .retryPolicy(new ExponentialBackoffRetry(baseSleepTimeMs, maxRetries))
                .namespace(namespace)
                .build();
        curatorFramework.start();
        return curatorFramework;
    }
}

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package com.hahashou.test.redis.enums;

import lombok.Getter;

/**
 * @description: 涉及Zookeeper的一些静态值
 * @author: 哼唧兽
 * @date: 9999/9/21
 **/
public enum ZookeeperEnum {

    ALL_AUTH("world", "anyone"),
    SYMBOL("/"),
    NAMESPACE("hahashou"),

    ;

    @Getter
    private String first;
    @Getter
    private String second;

    ZookeeperEnum(String first) {
        this.first = first;
    }

    ZookeeperEnum(String first, String second) {
        this.first = first;
        this.second = second;
    }
}

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package com.hahashou.test.redis.request;

import lombok.Data;

/**
 * @description: 入参
 * @author: 哼唧兽
 * @date: 9999/9/21
 **/
@Data
public class ZookeeperRequest {

    /** 路径(需带/) */
    private String path;

    /** 节点数据 */
    private String data;

    /** 是否递归删除节点(当节点不为空时,不可以是false) */
    private Boolean recursive;
}


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4. TestZookeeperController,并启动项目

package com.hahashou.test.redis.controller;

import com.hahashou.test.redis.enums.ZookeeperEnum;
import com.hahashou.test.redis.request.ZookeeperRequest;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.apache.curator.framework.CuratorFramework;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Id;
import org.apache.zookeeper.data.Stat;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * @description: 测试Zookeeper
 * @author: 哼唧兽
 * @date: 9999/9/21
 **/
@RestController
@RequestMapping("/zookeeper")
@Api(tags = "测试Zookeeper")
@Slf4j
public class TestZookeeperController {

    @Resource
    private CuratorFramework curatorFramework;

    @PostMapping("/createNode")
    @ApiOperation(value = "创建节点")
    public String createNode(@RequestBody ZookeeperRequest zookeeperRequest) {
        String path = zookeeperRequest.getPath(),
                data = zookeeperRequest.getData();
        ZookeeperEnum allAuth = ZookeeperEnum.ALL_AUTH;
        List<ACL> aclList = Arrays.asList(new ACL(ZooDefs.Perms.ALL, new Id(allAuth.getFirst(), allAuth.getSecond())));
        try {
            validPath(path);
            curatorFramework.create()
                    //没有父节点时 创建父节点
                    .creatingParentsIfNeeded()
                    //节点类型
                    .withMode(CreateMode.PERSISTENT)
                    // 配置权限
                    .withACL(aclList)
                    .forPath(path, data.getBytes());
        } catch (Exception e) {
            return "节点创建失败 : " + e.getMessage();
        }
        return "节点创建成功";
    }

    @PostMapping("/queryNode")
    @ApiOperation(value = "查询节点数据")
    public String queryNode(@RequestBody ZookeeperRequest zookeeperRequest) {
        String path = zookeeperRequest.getPath();
        String namespace = "/" + ZookeeperEnum.NAMESPACE.getFirst();
        try {
            validPath(path);
            Stat stat = curatorFramework.checkExists().forPath(path);
            if (stat == null) {
                return "不存在该节点";
            }
            String dataString = new String(curatorFramework.getData().forPath(path));
            return "节点 " + namespace + path + " 的数据为 : " + dataString;
        } catch (Exception e) {
            log.error("查询节点失败 : {}", e.getMessage());
            return "";
        }
    }

    @PostMapping("/queryChildNodes")
    @ApiOperation(value = "查询子节点及其数据")
    public List<ZookeeperRequest> queryChildNodes(@RequestBody ZookeeperRequest zookeeperRequest) {
        List<ZookeeperRequest> result = new ArrayList<>();
        String path = zookeeperRequest.getPath();
        String symbol = ZookeeperEnum.SYMBOL.getFirst();
        if (StringUtils.isEmpty(path)) {
            path = symbol;
        }
        try {
            List<String> childList = curatorFramework.getChildren().forPath(path);
            for (String child : childList) {
                ZookeeperRequest zookeeperResponse = new ZookeeperRequest();
                boolean root = path.equals(symbol);
                child = root ? child : symbol + child;
                zookeeperResponse.setPath(root ? symbol + child : child);
                zookeeperResponse.setData(new String(curatorFramework.getData().forPath(path+child)));
                result.add(zookeeperResponse);
            }
        } catch (Exception e) {
            log.error("查询节点失败 : {}", e.getMessage());
        }
        return result;
    }

    public void validPath(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            throw new Exception("path为null或空");
        } else if (!path.startsWith(ZookeeperEnum.SYMBOL.getFirst())) {
            throw new Exception("路径没有带/");
        }
    }

    @PostMapping("/updateNodeData")
    @ApiOperation(value = "更新节点数据")
    public String updateNodeData(@RequestBody ZookeeperRequest zookeeperRequest) {
        String path = zookeeperRequest.getPath(),
                data = zookeeperRequest.getData();
        try {
            validPath(path);
            //也可指定版本更新,只有和节点版本一致才可更新成功 *.setData().withVersion(version).forPath(...);
            Stat stat = curatorFramework.setData().forPath(path, data.getBytes());
            log.info("stat : {}", stat);
        } catch (Exception exception) {
            log.error("更新数据失败 : {}", exception.getMessage());
            return "更新失败";
        }
        return "更新成功";
    }

    @PostMapping("/deleteNode")
    @ApiOperation(value = "删除节点")
    public String deleteNode(@RequestBody ZookeeperRequest zookeeperRequest) {
        String path = zookeeperRequest.getPath();
        Boolean recursive = zookeeperRequest.getRecursive();
        try {
            validPath(path);
            if (recursive) {
                curatorFramework.delete().deletingChildrenIfNeeded().forPath(path);
            } else {
                curatorFramework.delete().forPath(path);
            }
        } catch (Exception exception) {
            log.error("删除数据失败 : {}", exception.getMessage());
            return "删除失败";
        }
        return "删除成功";
    }
}

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5. 测试

5.1 依次新增7个节点

{"data": "100","path": "/first"}
{"data": "firstA","path": "/first/a"}
{"data": "firstB","path": "/first/b"}
{"data": "firstC","path": "/first/c"}
{"data": "200","path": "/second"}
{"data": "secondD","path": "/second/d"}
{"data": "secondF","path": "/second/f"}

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5.2 查询节点数据

{"path": "/first"}

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单个节点信息

5.3 查询子节点及其数据

{"path": "/"}

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根列表

{"path": "/first"}

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first

5.4 更新节点数据

{"data": "测试更新","path": "/first/a"}

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再次查询

{"path": "/first/a"}

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更新数据

5.5 删除节点

递归删除 /second 节点

{"path": "/second","recursive": true}

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非递归删除 /first/c 节点

{"path": "/first/c","recursive": false}

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进入zookeeper客户端

ls /hahashou
ls /hahashou/first

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剩余节点

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