拦截器限制用户访问次数和验证用户登录代码

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原创最新推荐文章于 2026-03-05 00:08:50 发布 1.2k 阅读 AI 写同款· GEO 优化 ›

Arduino程序设计（八）LCD显示实验本文主要介绍温度/温湿度传感器的LCD显示实验，分别是：1、LM35采集环境温度LCD显示；2、DS18B20采集环境温度LCD显示；3、DHT11采集环境温湿度LCD显示。（1）LM35介绍LM35特性特性说明基本功能LM35作为常用的温度传感器，可以检测周围的温度工作原理利用感温材料，通过内部电路将温度值转化为对应的电压信号工作电压4~30V，常用5V供电温度测量测量范围0~100℃ ，误差 ±0.5℃输出信号线性模拟信号输出，LM35输出电压和摄氏温度程线性关系。阅读详情

public class ClientAccessTimeControlInterceptor extends HandlerInterceptorAdapter {

  private Logger logger = LoggerFactory.getLogger(ClientAccessTimeControlInterceptor.class);

  @Autowired
  private RedisHelper redisHelper;

  @Autowired
  private MessageGenerator messageGenerator;

  @Autowired
  private LoginService loginService;


  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
      throws Exception {
    logger.info("Start to intercept http request." + request.getAttribute("accessToken"));
    if (request.getAttribute("accessToken") != null) {
      String accessToken = request.getAttribute("accessToken").toString();
      if (!loginService.checkLogin(accessToken)) {
        flush(response, messageGenerator.create(MessageCode.COMMON_ACCESS_TOKEN_REQUIRED, null));
        return false;
      }
      String redisKey =
          RedisKeysProvider.REQUEST_TIMES_LIMIT_BY_IP + ":" + NetworkUtils.getRemoteIP(request);
      if (!redisHelper.hasKey(redisKey)) {
        redisHelper.setObject(accessToken, 1, Const.ACCESS_TIMEOUT, TimeUnit.MINUTES);
      } else {
        int count = Integer
            .valueOf(
                redisHelper.getString(RedisKeysProvider.REQUEST_TIMES_LIMIT_BY_IP + accessToken));
        count = count + 1;
        if (count > Const.MAX_REQUEST_TIME) {
          flush(response, messageGenerator.create(MessageCode.COMMON_REQUEST_TOO_MUNCH, null));
          return false;
        }
      }
    } else {
      flush(response, messageGenerator.create(MessageCode.COMMON_ACCESS_TOKEN_REQUIRED, null));
      return false;
    }
    return true;