oracle查看当前日期是第几个星期的方法

   
select to_char(sysdate,'ww') ,to_char(sysdate,'iw') from dual;
select to_char(sysdate,'ddd') from dual;
select TRUNC(SYSDATE,'MM') from dual;1）

 int year=2011;
        int week=1;
        Calendar calFirstDayOfTheYear = new GregorianCalendar(year,
                Calendar.JANUARY, 1);
            calFirstDayOfTheYear.add(Calendar.DATE, 7 * (week-1));

 
            int dayOfWeek = calFirstDayOfTheYear.get(Calendar.DAY_OF_WEEK);

 
            Calendar calFirstDayInWeek = (Calendar)calFirstDayOfTheYear.clone();
            calFirstDayInWeek.add(Calendar.DATE,
                calFirstDayOfTheYear.getActualMinimum(Calendar.DAY_OF_WEEK) - dayOfWeek);
            Date firstDayInWeek = calFirstDayInWeek.getTime();
            System.out.println(year + "年第" + week + "个礼拜的第一天是" + ReportDateUtil.getFromatDay().format(firstDayInWeek));

 
            Calendar calLastDayInWeek = (Calendar)calFirstDayOfTheYear.clone();
            calLastDayInWeek.add(Calendar.DATE,
                calFirstDayOfTheYear.getActualMaximum(Calendar.DAY_OF_WEEK) - dayOfWeek);
            Date lastDayInWeek = calLastDayInWeek.getTime();
            System.out.println(year + "年第" + week + "个礼拜的最后一天是" + ReportDateUtil.getFromatDay().format(lastDayInWeek));