Java中国語の日付を日付に変換

    public static void main(String[] args) throws IOException {
        testConvertZwrq();
    }

    private static void testConvertZwrq() {
        String[] list = new String[] { " ○○       ", "○       ", " ○○         ", "            " };
        for (String s : list) {
            Date d = convertCnDate(s);
            System.out.println(new SimpleDateFormat("yyyy-MM-dd").format(d));
        }
    }

    public static Date convertCnDate(String cprq) {
        int yearPos = cprq.indexOf(" ");
        int monthPos = cprq.indexOf(" ");
        String cnYear = cprq.substring(0, yearPos);
        String cnMonth = cprq.substring(yearPos + 1, monthPos);
        String cnDay = cprq.substring(monthPos + 1, cprq.length() - 1);
        String year = ConvertCnYear(cnYear);
        String month = ConvertCnDateNumber(cnMonth);
        String day = ConvertCnDateNumber(cnDay);
        Calendar c = Calendar.getInstance();
        c.set(Calendar.YEAR, Integer.parseInt(year));
        c.set(Calendar.MONTH, Integer.parseInt(month)-1);
        c.set(Calendar.DAY_OF_MONTH, Integer.parseInt(day));
        return c.getTime();
    }

    private static String ConvertCnYear(String cnYear) {
        if(cnYear.length() == 2)
           return "20" + ConvertCnNumberChar(cnYear);
        else
            return ConvertCnNumberChar(cnYear);
    }

    private static String ConvertCnDateNumber(String cnNumber) {
        if (cnNumber.length() == 1) {
            if(cnNumber.equals(" "))
          	return "10";
            else
          	return ConvertCnNumberChar(cnNumber);
        } else if (cnNumber.length() == 2) {
            if (cnNumber.startsWith(" ")) {
                return "1" + ConvertCnNumberChar(cnNumber.substring(1, 2));
            } else if (cnNumber.endsWith(" ")) {
                return ConvertCnNumberChar(cnNumber.substring(0, 1)) + "0";
            } else {
                return ConvertCnNumberChar(cnNumber);
            }
        } else if (cnNumber.length() == 3) {
            return ConvertCnNumberChar(cnNumber.substring(0, 1) + cnNumber.substring(2, 3));
        }
        return null;
    }

    private static String ConvertCnNumberChar(String cnNumberStr) {
        String ALL_CN_NUMBER = "○          ";
        String ALL_NUMBER = "00123456789";
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < cnNumberStr.length(); i++) {
            char c = cnNumberStr.charAt(i);
            int index = ALL_CN_NUMBER.indexOf(c);
            if (index != -1) {
                buf.append(ALL_NUMBER.charAt(index));
            } else {
                buf.append(cnNumberStr.charAt(i));
            }
        }
        return buf.toString();
    }