java实现多设备同时登录或强制下线

    /**
     * 登录成功后缓存用户信息
     *
     * @param req
     * @return
     */
    public void cacheUserInfo(CacheUserInfoReqDTO req) {
        // 1、缓存用户信息
        cacheUser(req);
        cacheAuth(req.getUid(), req.getRoles(), req.getPermissions());
        // 2、更新token与userId关系
        String userTokenRelationKey = RedisKeyHelper.getUserTokenRelationKey(req.getEntId() + SymbolConstant.COLON + req.getUid());
        redisAdapter.set(userTokenRelationKey, req.getToken(), RedisTtl.USER_LOGIN_SUCCESS);
    }

@Override
protected Mono<Void> innerFilter(ServerWebExchange exchange, WebFilterChain chain) {
        String token = filterContext.getToken();
        if (StringUtils.isBlank(token)) {
            throw new DataValidateException(GatewayReturnCodes.TOKEN_MISSING);
        }
        // scan获取user的key
        String userKey = "";
        Set<String> scan = redisAdapter.scan(GatewayRedisKeyPrefix.USER_KEY.getKey() + "*" + token);
        if (scan.isEmpty()) {
            throw new DataValidateException(GatewayReturnCodes.TOKEN_EXPIRED_LOGIN_SUCCESS);
        }
        userKey = scan.iterator().next();
        MyUser myUser = (MyUser) redisAdapter.get(userKey);
        if (myUser == null) {
            throw new BusinessException(GatewayReturnCodes.TOKEN_EXPIRED_LOGIN_SUCCESS);
        }
        // 将用户信息塞入http header
        // do something...
        return chain.filter(exchange.mutate().request(newServerHttpRequest).build());
    }

 String userTokenRelationKey = RedisKeyHelper.getUserTokenRelationKey(req.getEntId() + SymbolConstant.COLON + userEntList.get(0).getUserId());
            String redisToken = (String) redisAdapter.get(userTokenRelationKey);
if (StringUtils.isNotEmpty(redisToken) && !redisToken.equals(token)) {
        throw new BusinessException(UserReturnCodes.MULTI_DEVICE_LOGIN);
            }

 String userTokenRelationKey = RedisKeyHelper.getUserTokenRelationKey(req.getEntId() + SymbolConstant.COLON + userEntity.getId());
    // 获取当前已用户的登录token
    String redisToken = (String) redisAdapter.get(userTokenRelationKey);
    // 踢下线之前全部登录
    Response<Void> exitLoginResponse = gatewayRpc.allExit(ExitLoginReqDTO.builder().token(redisToken).userId(userEntity.getId()).build());