往前往后推时间（排除工作日和节假日）

public static Date getNextWorkingDay(int period) throws DBException {
        CodeMgr codeMgr = (CodeMgr) BizMgrRegistry.getInstance().getBizMgr(
                "com.leapii.code.bm.CodeMgr");
        Collection publicHolidayCollection = codeMgr
                .getCodeByType(DORMConstants.PUBLIC_HOLIDAY);

        Calendar currentDay = Calendar.getInstance(TimeZone
                .getTimeZone("GMT+08"));
        currentDay.setTime(DateUtil.getDate());

        for (int i = 0; i < period; i++) {
            boolean isPublicHoliday = false;

            currentDay.set(Calendar.DATE, currentDay.get(Calendar.DATE) + 1);

            String currenDayStr = DateUtil.format(currentDay.getTime(),
                    "yyyyMMdd");

            System.out.println(currenDayStr);

            Iterator itr = publicHolidayCollection.iterator();
            while (itr.hasNext()) {
                Code code = (Code) itr.next();
                if (code.getValue().equals(currenDayStr)) {
                    isPublicHoliday = true;
                    break;
                }
            }

            int dayOfWeek = currentDay.get(Calendar.DAY_OF_WEEK);
            if (Calendar.SATURDAY == dayOfWeek || Calendar.SUNDAY == dayOfWeek
                    || isPublicHoliday) {
                System.out.println("Weekend Or Public Holiday");
                period = period + 1;
            }
        }

        return currentDay.getTime();
    }

public static Date getLastWorkingDay(int period) throws DBException {
        CodeMgr codeMgr = (CodeMgr) BizMgrRegistry.getInstance().getBizMgr(
                "com.leapii.code.bm.CodeMgr");
        Collection publicHolidayCollection = codeMgr
                .getCodeByType(DORMConstants.PUBLIC_HOLIDAY);

        Calendar currentDay = Calendar.getInstance(TimeZone
                .getTimeZone("GMT+08"));
        currentDay.setTime(DateUtil.getDate());

        for (int i = 0; i < period; i++) {
            boolean isPublicHoliday = false;

            currentDay.set(Calendar.DATE, currentDay.get(Calendar.DATE) - 1);

            String currenDayStr = DateUtil.format(currentDay.getTime(),
                    "yyyyMMdd");

            System.out.println(currenDayStr);

            Iterator itr = publicHolidayCollection.iterator();
            while (itr.hasNext()) {
                Code code = (Code) itr.next();
                if (code.getValue().equals(currenDayStr)) {
                    isPublicHoliday = true;
                    break;
                }
            }

            int dayOfWeek = currentDay.get(Calendar.DAY_OF_WEEK);
            if (Calendar.SATURDAY == dayOfWeek || Calendar.SUNDAY == dayOfWeek
                    || isPublicHoliday) {
                System.out.println("Weekend Or Public Holiday");
                period = period + 1;
            }
        }

        return currentDay.getTime();
    }