java工具DateUtil

//一年内的周一
public final class DateUtil{

       /**
       *获得当前周的周一 的00：00：00
       */
       public static Date getMonDayOfCurrentWeak() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        return calendar.getTime();
      }
   
    /**
    *获得当前周的周天的23:59:59
    */
    public static Date getSunDayOfCurrentWeak(){
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.WEEK_OF_YEAR, 1);
        calendar.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY);
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);
        return calendar.getTime();
    }

 

改进版：跨年也没问题（依赖commons-lang.jar）

public final class DateUtil{
public static Date getMonDayOfCurrentWeak() {
		Calendar calendar = Calendar.getInstance();
		int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
		Date date=null;
		if(dayOfWeek>Calendar.MONDAY){
			date = DateUtils.addDays(calendar.getTime(), Calendar.MONDAY-dayOfWeek);
			calendar.setTime(date);
		}else if (dayOfWeek==Calendar.SUNDAY) {
			date = DateUtils.addDays(calendar.getTime(), -6);
			calendar.setTime(date);
		}
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		return calendar.getTime();
	}
	
	public static Date getSunDayOfCurrentWeak(){
		Calendar calendar = Calendar.getInstance();
		int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
		Date date=null;
		if(dayOfWeek>Calendar.SUNDAY){
			date = DateUtils.addDays(calendar.getTime(), 8-dayOfWeek);
			calendar.setTime(date);
		}
		calendar.set(Calendar.HOUR_OF_DAY, 23);
		calendar.set(Calendar.MINUTE, 59);
		calendar.set(Calendar.SECOND, 59);
		return calendar.getTime();
	}
}

 

 

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