java取得格式化时间的最小刻度的整点时间

public class Test{   /**     * 取得符合规范的data     *     * @param sourDate     * @param pattern     * @return     */    public static Date praseDateToDataByPattern(Date sourDate, String pattern) throws ParseException {        if (sourDate == null || pattern == null) {            throw new ParseException("错误的日期和格式化字符", 0);        }        SimpleDateFormat sdf = new SimpleDateFormat(pattern);        String result_date = sdf.format(sourDate);        return sdf.parse(result_date);    }    /**     * 取得格式化字符串的整点数据     * 根据格式化的字符串的最小单位四舍五入的对时间进行操作     * 如  2013-05-01 02:12:34  -->2013-05-01 02:13:00     * 2013-05-01 02:12:12  -->2013-05-01 02:12:00     *     * @param date   日期     * @param format 格式化的字符串     * @return     */    public static String getCorrectDateOnEntire(Date date, String format) throws ParseException {        if (date == null || format == null) {            throw new ParseException("错误的日期和格式化字符", 0);        }        SimpleDateFormat sdf = new SimpleDateFormat(format);        char[] ch = format.toCharArray();        StringBuffer least_precision = new StringBuffer();        for (int i = ch.length; i > 0; i--) {            if (ch[ch.length - 1] == ch[i - 1]) {                least_precision.append(ch[i - 1]);            } else {                break;            }        }        Date run_date = praseDateToDataByPattern(date, format);        Calendar calendar = Calendar.getInstance();        calendar.setTime(run_date);        int field = TimeAccuracy.valueOf(least_precision.toString()).textVal;        int real_time = calendar.get(field);        int possible_max_time = calendar.getMaximum(field);// 12小时制        if (real_time > possible_max_time) {            calendar.roll(field, true);        } else {            calendar.roll(field, calendar.getMinimum(field));        }        return sdf.format(calendar.getTime());    }    public static enum TimeAccuracy {        yyyy(Calendar.YEAR),        MM(Calendar.MONTH),        dd(Calendar.DATE),        HH(Calendar.HOUR),        mm(Calendar.MINUTE),        ss(Calendar.MILLISECOND);        private int textVal;        private TimeAccuracy(int textVal) {            this.textVal = textVal;        }        private int getIntValue() {            return textVal;        }    }}