指定时间段获取一个随机时间

public class RandomDate {
/**
* 生成随机时间
*
* @param beginDate
* @param endDate
* @return
*/
public static Date randomDate(String beginDate, String endDate) {
try {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date start = format.parse(beginDate);
Date end = format.parse(endDate);
if (start.getTime() >= end.getTime()) {
return null;
}
long date = random(start.getTime(), end.getTime());
return new Date(date);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

private static long random(long begin, long end) {
long rtn = begin + (long) (Math.random() * (end - begin));
if (rtn == begin || rtn == end) {
return random(begin, end);
}
return rtn;
}

}