java雪花算法

java工具类
1.IdGeneratorSnowflake.java用于生成雪花算法，分为有参构造和无参构造

package com.sale.util.common;

import cn.hutool.core.lang.Snowflake;
import cn.hutool.core.net.NetUtil;
import cn.hutool.core.util.IdUtil;
import lombok.Data;
import lombok.Synchronized;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

/**
 * @author wjn
 * @version 1.0
 * @date 2020/12/10 18:13
 */
@Slf4j
@Component
public class IdGeneratorSnowflake {

    private long workerId =0;
    private long datacenterId=1;
    private Snowflake snowflake= IdUtil.createSnowflake(workerId,datacenterId);

    @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.info("当前机器的workerId获取失败",e);
            workerId=NetUtil.getLocalhostStr().hashCode();
        }

    }
    public synchronized long snowflakeId(){
        return snowflake.nextId();
    }
    public synchronized long snowflakeId(long workerId,long datacenterId){
        Snowflake snowflake= IdUtil.createSnowflake(workerId,datacenterId);
        return snowflake.nextId();
    }

    public static void main(String[] args) {
        System.out.println(new IdGeneratorSnowflake().snowflakeId());
    }
}

2.service层

public interface DeliverGoodsService {

    String getIDBySnowFlake();
}

　　

3.serviceimpl层

@Slf4j
@Service
@Transactional
public class DeliverGoodsServiceImpl implements DeliverGoodsService {
  @Autowired
    private IdGeneratorSnowflake idGeneratorSnowflake; 
  
   @Override
    public String getIDBySnowFlake() {
        ExecutorService executorService= Executors.newFixedThreadPool(5);
        for (int i=1;i<=20;i++){
            executorService.submit(()->{
                System.out.println(idGeneratorSnowflake.snowflakeId());
            });
        }
        executorService.shutdown();
        return "hello snowflake";
    }
}

项目设计的工具类
<!--Java工具类库-->
<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.5.2</version>
</dependency>
java工具类库包含时间戳生成，图片工具类，加密工具类，ip工具类等一系列工具类，非常强大

github开源地址 https://github.com/looly/hutool/
官方中文文档 https://www.hutool.cn/docs/#/
哔哩哔哩springcloudalibaba上硅谷视频视频 https://www.bilibili.com/video/BV18E411x7eT?from=search&seid=13488436241056256401
上硅谷github地址sql及脑图 https://github.com/acloudyh/springCloud