/**

     * 获取指定日期所在周的第一天和最后一天,用下划线连接

     * @param dataStr

     * @return

     * @throws ParseException

     */

    public static String getFirstAndLastOfMonth(String dataStr,String dateFormat,String resultDateFormat) throws ParseException {

        //获取当前月第一天：

        Calendar c = Calendar.getInstance();

        c.setTime(new SimpleDateFormat(dateFormat).parse(dataStr));

        c.add(Calendar.MONTH, );

        c.set(Calendar.DAY_OF_MONTH,);//设置为1号,当前日期既为本月第一天

        String first = new SimpleDateFormat(resultDateFormat).format(c.getTime());

        System.out.println("===============first:"+first);

        //获取当前月最后一天

        Calendar ca = Calendar.getInstance();

        ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));

        String last = new SimpleDateFormat(resultDateFormat).format(ca.getTime());

        System.out.println("===============last:"+last);

        return first+"_"+last;

    }

    /**

     * 每周的第一天和最后一天

     * @param dataStr

     * @param dateFormat

     * @param resultDateFormat

     * @return

     * @throws ParseException

     */

    public static String getFirstAndLastOfWeek(String dataStr,String dateFormat,String resultDateFormat) throws ParseException {

        Calendar cal = Calendar.getInstance();

        cal.setTime(new SimpleDateFormat(dateFormat).parse(dataStr));

        int d = ;

        if (cal.get(Calendar.DAY_OF_WEEK) == ) {

            d = -;

        } else {

            d =  - cal.get(Calendar.DAY_OF_WEEK);

        }

        cal.add(Calendar.DAY_OF_WEEK, d);

        // 所在周开始日期

        String data1 = new SimpleDateFormat(resultDateFormat).format(cal.getTime());

        cal.add(Calendar.DAY_OF_WEEK, );

        // 所在周结束日期

        String data2 = new SimpleDateFormat(resultDateFormat).format(cal.getTime());

        return data1 + "_" + data2;

    }