redisTemplate加锁Demo

/**
     * 设备缴费
     *
     * @param dto
     */
    @Override
    public boolean payForDevice(TPayCostFlowDTO dto) {
        boolean result = false;
        //加锁
        String key = Constant.PAY_COST_REDIS_LOCK + dto.getDeviceId();
        boolean flag = redisTemplate.opsForValue().setIfAbsent(key, "1", Duration.ofSeconds(30));
        if (flag) {
            try {
                Map<String, Object> deviceMap = tPayCostFlowMapper.getDeviceAmountAndUserInfo(dto.getDeviceId());
                String baseAmount = "0.00";
                String userAccount = "";
                if (null != deviceMap && !deviceMap.isEmpty()) {
                    Object obj = deviceMap.get("account");
                    if (null != obj) {
                        baseAmount = String.valueOf(obj);
                    }
                    userAccount = deviceMap.get("userAccount") + "";
                }
                BigDecimal amount = new BigDecimal(baseAmount);
                BigDecimal payAmount = new BigDecimal(dto.getPayAmount());
                TPayCostFlow costFlow = new TPayCostFlow();
                BigDecimal balanceAmount = payAmount.add(amount);
                costFlow.setDeviceId(dto.getDeviceId())
                        .setPayType(dto.getPayType())
                        .setPayStatus("1")
                        .setTradeNo(RedisSerialNoUtil.generateTradeNo(Constant.REDIS_TRADE_NO_KEY))
                        .setPaySource(dto.getPaySource())
                        .setPayWay(dto.getPayWay())
                        .setPayAmount(payAmount)
                        .setUnit(dto.getUnit())
                        .setRemark(dto.getRemark())
                        .setPayTime(LocalDateTime.now())
                        .setDealUser(getUserName(SecurityUtils.getCurrentUserLogin().get()))
                        .setPayUser(userAccount)
                        .setPayBeforeAmount(amount)
                        .setPayAfterAmount(balanceAmount);

                //添加缴费流水信息
                tPayCostFlowMapper.insert(costFlow);
                //更新设备余额信息
                Map<String, Object> map = new HashMap<>();
                map.put("id", dto.getDeviceId());
                map.put("amount", balanceAmount);
                tPayCostFlowMapper.updateDeviceAmount(map);
                //添加缴费流水 审核信息 默认未审核状态
                TPayCostApproval approval = new TPayCostApproval();
                approval.setFlowId(costFlow.getId()).setApprovalStatus("01").setVersion(0);
                tPayCostApprovalMapper.insert(approval);
                //操作完成 解锁
                redisTemplate.opsForValue().getOperations().delete(key);
                //添加操作日志
                RequestAttributes requestAttributes = RequestContextHolder.currentRequestAttributes();
                HttpServletRequest request = ((ServletRequestAttributes) requestAttributes).getRequest();
                SysOperationLogUtils.info(i18nMessage.getMessage("pay.cost.add") + ": " + dto.getDeviceId(), LogEnum.ADD.getKey(), null, this.getClass(), "payForDevice", request);
                //缴费成功 且设备余额大于0 result = true;
                if (balanceAmount.compareTo(BigDecimal.ZERO) == 1) {
                    result = true;
                }
            } catch (Exception e) {
                e.printStackTrace();
                //操作失败 解锁
                redisTemplate.opsForValue().getOperations().delete(key);
                throw new BusinessException(i18nMessage.getMessage("error.pay.cost"));
            }
        } else {
            throw new BusinessException(i18nMessage.getMessage("error.pay.lock"));
        }
        return result;
    }