定时器
<–直接上代码–>
package utils;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class timeTest {
/**
* 定时器
*/
static int count = 0;
public static void showTimer() {
TimerTask task = new TimerTask() {
@Override
public void run() {
++count;
System.out.println("时间=" + new Date() + " 执行了" + count + "次"); // 1次
}
};
// 设置执行时间
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DAY_OF_MONTH);// 每天
// 定制每天的21:09:00执行,
calendar.set(year, month, day, 10, 26, 30);
Date date = calendar.getTime();
Timer timer = new Timer();
// 每天的date时刻执行task,每隔2秒重复执行
//int period = 2 * 1000;
//timer.schedule(task, date, period);
// 每天的date时刻执行task, 仅执行一次
timer.schedule(task, date);
}
/**
* 固定格式比较固定时间是否在时间区域内
*/
public static void timeVS() {
String format = "HH:mm:ss";
SimpleDateFormat sf = new SimpleDateFormat("HH:mm:ss");
String now = sf.format(new Date().getTime());
Date nowTime;
try {
nowTime = new SimpleDateFormat(format).parse(now);
Date startTime = new SimpleDateFormat(format).parse("09:00:00");
Date endTime = new SimpleDateFormat(format).parse("17:00:00");
if (isEffectiveDate(nowTime, startTime, endTime)) {
System.out.println("系统时间在早上9点到下午17点之间.");
} else {
System.out.println("系统时间不在早上9点到下午17点之间.");
}
} catch (java.text.ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 判断当前时间是否在[startTime, endTime]区间,注意时间格式要一致
*
* @param nowTime
* 当前时间
* @param startTime
* 开始时间
* @param endTime
* 结束时间
* @return
* @author jqlin
*/
public static boolean isEffectiveDate(Date nowTime, Date startTime, Date endTime) {
if (nowTime.getTime() == startTime.getTime() || nowTime.getTime() == endTime.getTime()) {
return true;
}
Calendar date = Calendar.getInstance();
date.setTime(nowTime);
Calendar begin = Calendar.getInstance();
begin.setTime(startTime);
Calendar end = Calendar.getInstance();
end.setTime(endTime);
if (date.after(begin) && date.before(end)) {
return true;
} else {
return false;
}
}
public static void main(String[] args) {
showTimer();
timeVS();
}
}