package util; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import org.apache.commons.lang.time.DateUtils; public class WeekDay { private Date firstWeek; private WeekDay(){ try { SimpleDateFormat year=new SimpleDateFormat("yyyy-MM-dd"); SimpleDateFormat firstDay=new SimpleDateFormat("yyyy-01-01"); firstWeek=year.parse(firstDay.format(new Date())); switch(firstWeek.getDay()){ case 0:firstWeek=DateUtils.addDays(firstWeek,-6);break;//周末 case 1:break;//周一 case 2:firstWeek=DateUtils.addDays(firstWeek,-1);break; case 3:firstWeek=DateUtils.addDays(firstWeek,-2);break; case 4:firstWeek=DateUtils.addDays(firstWeek,-3);break; case 5:firstWeek=DateUtils.addDays(firstWeek,-4);break; case 6:firstWeek=DateUtils.addDays(firstWeek,-5);break; } } catch (ParseException e) { e.printStackTrace(); } } private WeekDay(Date firstDay){ firstWeek=firstDay; } public long getWeekCount(){ return getWeekCount(new Date()); } public long getWeekCount(Date nowDate){ SimpleDateFormat year=new SimpleDateFormat("yyyy-MM-dd"); switch(nowDate.getDay()){ case 0:break;//周末 case 1:nowDate=DateUtils.addDays(nowDate,6);break;//周1 case 2:nowDate=DateUtils.addDays(nowDate,5);break; case 3:nowDate=DateUtils.addDays(nowDate,4);break; case 4:nowDate=DateUtils.addDays(nowDate,3);break; case 5:nowDate=DateUtils.addDays(nowDate,2);break; case 6:nowDate=DateUtils.addDays(nowDate,1);break; } long dayCount=nowDate.getTime()-firstWeek.getTime(); int minute=60*1000; return (dayCount/(24*60*minute))/7; } }
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