一、利用nacos等注册中心，实例启动的时把自身workerid注册到nacos等

二、利用redis，把workerid注册到redis中

三、利用ip转long取模（该方法存在取值后重复的问题，暂不在此处讨论）

方案一实现：

/**
 * @author cboy
 * @date 2022/02/28 16:50:48
 */
@Configuration
@Slf4j
public class IdWorkerConfig {

    @Value("${spring.application.name}")
    private String serviceName;
    @Value("${spring.cloud.nacos.discovery.group:DEFAULT_GROUP}")
    private String groupName;

    @Resource
    private NacosServiceManager nacosServiceManager;
    @Resource
    private NacosDiscoveryProperties nacosDiscoveryProperties;

    public byte workerIdBitLength = 6;

    public static final String WORKER_ID = "worker_id";

    /**
     * 注册服务的时候同时注册worker_id
     */
    @PostConstruct
    public void setWorkerId() {
        Map<String, String> metadata = nacosDiscoveryProperties.getMetadata();
        int workerId = getWorkerId();
        metadata.put(IdWorkerConfig.WORKER_ID, String.valueOf(workerId));
        nacosDiscoveryProperties.setMetadata(metadata);
        log.info("注册workerId[" + workerId + "]到Nacos");
        //设置分布式id生成方式
        IdGeneratorOptions options = new IdGeneratorOptions((short) workerId);
        IdHelper.setIdGenerator(options);
    }

    /**
     * 获取所有实例
     *
     * @return
     */
    private List<Instance> getAllInstances() {
        try {
            NamingService namingService = nacosServiceManager.getNamingService(nacosDiscoveryProperties.getNacosProperties());
            return namingService.getAllInstances(serviceName, groupName);
        } catch (NacosException e) {
            log.error("获取Nacos实例出错:{}", e);
            throw new RuntimeException(e);
        }
    }


    /**
     * 获取已使用的所有workerId
     *
     * @return
     */
    private List<String> getAllUsedWorkerId() {
        List<Instance> allInstances = getAllInstances();
        List<String> workerIds = new ArrayList<>();
        for (Instance instance : allInstances) {
            String workerId = instance.getMetadata().get(WORKER_ID);
            if (workerId != null) {
                workerIds.add(workerId);
            }
        }
        return workerIds;
    }

    /**
     * 获取可用的的workerId
     *
     * @return
     */
    public int getWorkerId() {
        int maxWorkerId = (1 << workerIdBitLength) - 1;
        List<String> allUsedWorkerId = getAllUsedWorkerId();
        log.info("workerId:{}，{}个已被注册使用,可注册workerId为0-{}", allUsedWorkerId, allUsedWorkerId.size(), maxWorkerId);
        if (allUsedWorkerId.isEmpty()) {
            return 0;
        }
        for (int i = 0; i <= maxWorkerId; i++) {
            if (!allUsedWorkerId.contains(String.valueOf(i))) {
                return i;
            }
        }
        throw new RuntimeException("worker_id已用完请重新分配！");
    }

}
方案二实现：

该图来自网络，拿来直接用了