使用Redis实现一个分布式的全局ID

当然实现方式有很多中，这里主要是记录一下使用Redis的实现方式

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @author QiuQiu&LL (个人博客:https://www.cnblogs.com/qbbit)
 * @version 1.0
 * @date 2022-07-24  12:57
 * @Description:Redis生成全局唯一ID
 */
@Slf4j
@Component
public class RedisIdWorker {

    public static final long BEGIN_TIMESTAMP = 1640995200L;
    /**
     * 序列号的位数
     */
    public static final int COUNT_BITS = 32;

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix) {
        // 1、生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;

        // 2、生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 自增
        long count = stringRedisTemplate.opsForValue().increment("incr:" + keyPrefix + ":" + date);

        // 位运算,拼接
        return timeStamp << COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2022, 1, 1, 0, 0, 0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println(second);
    }
}