1定时器 定时几点出发；2对当前时间的判断；3获取某天0点时间戳
1TimeUtil类
public class TimeUtil {
public staticDate buildTime(inthour,intminute,intsecond) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, minute);
calendar.set(Calendar.SECOND, second);
Date time = calendar.getTime();
if(time.before(newDate())) {
//若果当前时间已经是凌晨1点后，需要往后加1天，否则任务会立即执行。
//很多系统往往系统启动时就需要立即执行一次任务，但下面又需要每天凌晨1点执行，怎么办呢？
//很简单，就在系统初始化话时单独执行一次任务（不需要用定时器，只是执行那段任务的代码）
time =addDay(time,1);
}
returntime;
}
private staticDate addDay(Date date,intdays) {
Calendar startDT = Calendar.getInstance();
startDT.setTime(date);
startDT.add(Calendar.DAY_OF_MONTH, days);
returnstartDT.getTime();
}
}
1.2调用
Timer timer =newTimer();
timer.schedule(deleteTransTask, TimeUtil.buildTime(9,30,0),1000*60*60*24);
2isXXXXTime()类
public boolean isXXXXTime() {
//9:30-11:30,13:00-15:00;
Calendar cal = Calendar.getInstance();//日期
//week hour minute minuteofday 当前时间
int week = cal.get(Calendar.DAY_OF_WEEK);
int hour = cal.get(Calendar.HOUR_OF_DAY);//获取小时
int minute = cal.get(Calendar.MINUTE);//获取分钟
//用这个字段判断
int minuteOfDay = hour *60+ minute;//从0:00分开是到目前为止的分钟数
//自己设定的时间范围
final intamStart =8*60+36;//起始时间的分钟数
final intpmStart =13*60+00;
final intamEnd =8*60+38;//结束时间的分钟数
final intpmEnd =13*60+10;
if(week ==1|| week ==7) {
return false;
}else if(minuteOfDay >= amStart && minuteOfDay <= amEnd) {//上午开盘
return true;
}else if(minuteOfDay >= pmStart && minuteOfDay <= pmEnd) {//下午开盘
return true;
}else{
return false;
}
}
3方法：返回当天零点的时间戳
public long getDayBeginTimestamp() {
Date date =new Date();
GregorianCalendar gc =newGregorianCalendar();
gc.setTime(date);
Date date2 =newDate(date.getTime() - gc.get(gc.HOUR_OF_DAY) *60*60
*1000- gc.get(gc.MINUTE) *60*1000- gc.get(gc.SECOND)
*1000);
return date2.getTime()/1000;
}