雪花算法生成全局唯一ID

package com.fwz.tproject.testfunction.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.fwz.tproject.testfunction.service.OrderService;

/**
 * Controller
 * 
 * @author 冯文哲
 * @version 2018-06-11
 */
@RestController
@RequestMapping(value = "/test")
public class MainController {
    @Autowired
    OrderService service;

    @RequestMapping(value = "test")
    public String test() {

        return service.getIDBySnowFlake();
    }

}

Service : IdGeneratorSnowflake OrderService

package com.fwz.tproject.testfunction.service;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import cn.hutool.core.lang.Snowflake;
import cn.hutool.core.net.NetUtil;
import cn.hutool.core.util.IdUtil;

@Component
public class IdGeneratorSnowflake {
    private long workerId = 0;
    private long datacenterId = 1;
    private Snowflake snowflake = IdUtil.createSnowflake(workerId, datacenterId);

    private static final Logger log = LoggerFactory.getLogger(IdGeneratorSnowflake.class.getName());

    // 依赖注入完成后执行该方法，进行一些初始化工作
    @PostConstruct
    public void init() {
        try {
            workerId = NetUtil.ipv4ToLong(NetUtil.getLocalhostStr());
            log.info("当前机器的workerId: {}", workerId);
        } catch (Exception e) {
            e.printStackTrace();
            log.warn("当前机器的workerId获取失败", e);
            // 释放ID
            workerId = NetUtil.getLocalhostStr().hashCode();
        }
    }

    // 使用默认机房号获取ID
    public synchronized long snowflakeId() {
        return snowflake.nextId();
    }

    // 自己制定机房号获取ID
    public synchronized long snowflakeId(long workerId, long datacenterId) {
        Snowflake snowflake = IdUtil.createSnowflake(workerId, datacenterId);

        return snowflake.nextId();
    }

    /**
     * 生成的是不带-的字符审，类似于: 73a64edf935d4952a287739a66f96e06
     * 
     * @return
     */
    public String simpleUUID() {
        return IdUtil.simpleUUID();
    }

    /**
     * 生成的UUID是带-的字符串，类似于: b12b6401-6f9c-4351-b2b6-d8afc9ab9272
     * 
     * @return
     */
    public String randomUUID() {
        return IdUtil.randomUUID();
    }

    public static void main(String[] args) {
        IdGeneratorSnowflake f = new IdGeneratorSnowflake();
        for (int i = 0; i < 1000; i++) {

            System.out.println(f.snowflakeId(0, 0));
        }

    }
}

package com.fwz.tproject.testfunction.service;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class OrderService {
    @Autowired
    private IdGeneratorSnowflake idGenerator;

    public String getIDBySnowFlake() {
        ExecutorService threadPool = Executors.newFixedThreadPool(5);
        for (int i = 1; i <= 20; i++) {
            threadPool.submit(() -> {
                System.out.println(idGenerator.snowflakeId());
            });
        }
        threadPool.shutdown();
        return "he1lo snowflake";
    }
}

pom.xml

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-captcha</artifactId>
    <version>5.2.0</version>
</dependency>