redis生成唯一id

package com.ruoyi.function.service.impl;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.support.atomic.RedisAtomicLong;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Date;

/**
 * redis生成唯一id
 */
@Service
public class SequenceService
{
    
    private static Logger logger = LoggerFactory.getLogger(SequenceService.class);
    
    @Resource
    private RedisTemplate redisTemplate;
    
    //用作存放redis中的key
    private static String ORDER_KEY = "pi_number";
    
    //生成特定的业务编号，prefix为特定的业务代码
    public String getOrderNo ( String prefix )
    {
        return getSeqNo(ORDER_KEY , prefix);
    }
    
    //SequenceService类中公用部分，传入制定的key和prefix
    private String getSeqNo ( String key , String prefix )
    {
//        Calendar calendar = Calendar.getInstance();
//        calendar.set(Calendar.HOUR_OF_DAY , 23);
//        calendar.set(Calendar.MINUTE , 59);
//        calendar.set(Calendar.SECOND , 59);
//        calendar.set(Calendar.MILLISECOND , 999);
//        //设置过期时间，这里设置为当天的23:59:59
//        Date expireDate = calendar.getTime();
        Date expireDate =
                Date.from(LocalDateTime.of(LocalDate.now() , LocalTime.MAX).atZone(ZoneId.systemDefault()).toInstant());
        //返回当前redis中的key的最大值
        Long seq = generate(redisTemplate , key , expireDate);
        //获取当天的日期，格式为yyyyMMdd
//        String date = new SimpleDateFormat("yyyyMMdd").format(expireDate);
        String date = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        //生成八为的序列号，如果seq不够八位，seq前面补0，
        //如果seq位数超过了八位，那么无需补0直接返回当前的seq
        String sequence = StringUtils.leftPad(seq.toString() , 4 , "0");
        if ( prefix == null ) {
            prefix = "";
        }
        //拼接业务编号
        String seqNo = prefix + date + sequence;
        return seqNo;
    }
    
    /**
     * @param key
     * @param expireTime <i>过期时间</i>
     * @return
     */
    public static long generate ( RedisTemplate < ?, ? > redisTemplate , String key , Date expireTime )
    {
        //RedisAtomicLong为原子类，根据传入的key和redis链接工厂创建原子类
        RedisAtomicLong counter = new RedisAtomicLong(key , redisTemplate.getConnectionFactory());
        //设置过期时间
        counter.expireAt(expireTime);
        //返回redis中key的值，内部实现下面详细说明
        return counter.incrementAndGet();
    }
}

调用

    @Autowired
    private SequenceService sequenceService;




sequenceService.getOrderNo("sp")