redis distributed lock

The code is as follows: Among them, if you want to add an expiration time when locking, don't use opsForValue(), just change it to boundValueOps.

@ Slf4j
@Component
public class RedisService {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;


    /***
     * lock
     * @param key
     * @param value current time + timeout
     * @return lock returns true
     */
    public boolean lock(String key,String value){
        if(stringRedisTemplate.opsForValue().setIfAbsent(key,value)){//setNX 返回boolean
            return true;
        }
        //if the lock times out***
        String currentValue = stringRedisTemplate.opsForValue().get(key);
        if(!StringUtils.isEmpty(currentValue) && Long.parseLong(currentValue)<System.currentTimeMillis()){
            //time to acquire the last lock
            String oldvalue  = stringRedisTemplate.opsForValue().getAndSet(key,value);
            if(!StringUtils.isEmpty(oldvalue)&&oldvalue.equals(currentValue)){
                return true;
            }
        }
        return false;
    }
    /***
     * Unlock
     * @param key
     * @param value
     * @return
     */
    public void unlock(String key,String value){
        try {
            String currentValue = stringRedisTemplate.opsForValue().get(key);
            if(!StringUtils.isEmpty(currentValue)&¤tValue.equals(value)){
                stringRedisTemplate.opsForValue().getOperations().delete(key);
            }
        } catch (Exception e) {
            log.error("unlock exception");
        }
    }
}