1.编写lua脚本用于生成主键ID序列号,内容如下

local key = tostring(KEYS[1]);
local count = tonumber(KEYS[2]);
local dateStr = tostring(KEYS[3]);local newKey = key .. "_" .. dateStr;
local numRedis = redis.call("incr", newKey);
print(numRedis);if (numRedis == 1) thenredis.call("expire",newKey,60);
end-- 计算数字的位数
local function DightNum(num)if math.floor(num) ~= num or num < 0 thenreturn -1;elseif 0 == num thenreturn 1;elselocal tmp_dight = 0;while num > 0 donum = math.floor(num/10);tmp_dight = tmp_dight + 1;endreturn tmp_dight;end
end-- 在整数数字前面加0
-- dest_dight 标识最终生成位数，例如 AddZeroFrontNum(5, 1) 计算后是00001
local function AddZeroFrontNum(dest_dight, num)local num_dight = DightNum(num);if -1 == num_dight thenreturn -1;elseif dest_dight <= num_dight thenreturn tostring(num);elselocal str_e = ""for var =1, dest_dight - num_dight dostr_e = str_e .. "0";endreturn str_e .. tostring(num);end
endlocal idStr = AddZeroFrontNum(count, numRedis);
return dateStr .. idStr;

2.redis加载lua脚本文件

redis-cli -a redis script load "$(cat getGenerateId.lua)"
"b3d58fe8b47b1ca1e1fb074db5c3506a09ffdae8"

-a: redis密码，如果没有密码，该项不需要输入
下面的字符串即为加载后redis保存的sha值，通过该sha值可以访问lua脚本

3.java代码执行缓存的lua脚本文件

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import redis.clients.jedis.Jedis;import java.text.DateFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
@Service
public class RedisService {private static final DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");@Autowiredprivate RedisTemplate<String, String> redisTemplate;public Object executeScript(final String sha, final List<String> keys, final ArrayList<String> vals) {return redisTemplate.execute(new RedisCallback() {@Overridepublic Object doInRedis(RedisConnection connection) throws DataAccessException {Jedis jedis = (Jedis) connection.getNativeConnection();return jedis.evalsha(sha, keys, vals);}}, true);}/*** 每秒从 1 开始生成唯一标识，包括时间戳：yyyyMMddHHmmss* 最终格式为：yyyyMMddHHmmss + 四位有序数字* @param sha     redis中生成lua脚本的序列号* @param key     redis中存放id的key前缀* @param length  后面生成有序数字的位数* @return*/public Long fetchUUID(String sha, String key, String length){List<String> keys = new ArrayList<>();keys.add(key);keys.add(length);Calendar now = new GregorianCalendar();String datetime = df.format(now.getTime());keys.add(datetime);Object obj = executeScript(sha, keys, new ArrayList<String>());return Long.parseLong(String.valueOf(obj));}
}

然后调用fetchUUID该方法就可以了，key和length自定义，sha为第二步生成值