web项目中添加定时任务

public class StatisticInitServlet extends HttpServlet {
    private static Logger logger = Logger.getLogger(StatisticInitServlet.class);  
    /*每日23点40分执行定时任务*/
    public void init() throws ServletException {
        final Calendar calendar = Calendar.getInstance();
          calendar.set(Calendar.HOUR_OF_DAY,  23); 
          calendar.set(Calendar.MINUTE, 40); 
          calendar.set(Calendar.SECOND, 00); 
          Date time = calendar.getTime();   

          Timer timer = new Timer();
          timer.schedule(new TimerTask() {
              public void run() {
                  //统计当天新增设备数和新增用户数
                      daydeviceNum();
                      dayuserNum();
                      deleteRedisStatistic();
              }
              //1000 * 60 * 60 * 24
          }, time, 1000 * 60 * 60 * 24);// 这里设定将延时每天固定执行
        
    }

}