获取系统时间毫秒值

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import java.util.Calendar;

/**
* 时间工具类
* @author java_feng_gen

public class TimeUtil{

   /**
   * 获取当天的开始时间单位：毫秒
   * @return
   */
    private static Long getStartTime(){
        Calendar todayStart = Calendar.getInstance();
        todayStart.set(Calendar.HOUR, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);
        return todayStart.getTime().getTime();
    }

    /**
   * 获取当前系统时间单位：毫秒
   * @return
   */
    public static Long getNowTime() {
       Calendar todayNow = Calendar.getInstance();
       return todayNow.getTime().getTime();
    }

    /**
   * 获取当天的结束时间单位：毫秒
   * @return
   */
    private static Long getEndTime(){
        Calendar todayEnd = Calendar.getInstance();
        todayEnd.set(Calendar.HOUR, 23);
        todayEnd.set(Calendar.MINUTE, 59);
        todayEnd.set(Calendar.SECOND, 59);
        todayEnd.set(Calendar.MILLISECOND, 999);
        return todayEnd.getTime().getTime();
    }

}

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