如何將20080201000000轉換成2008-02-01 00:00:00形式，並且爲Datetime類型的

public static void main(String[] a) throws ParseException, java.text.ParseException {
        long time = 20080201000000l;
        String str = String.valueOf(time);
        String y, m, d, HH, mm, ss, datetime;
        StringBuffer sb = new StringBuffer();
        y = str.substring(0, 4);
        m = str.substring(4, 6);
        d = str.substring(6, 8);
        HH = str.substring(8, 10);
        mm = str.substring(10, 12);
        ss = str.substring(12, 14);
        sb.append(y).append("-").append(m).append("-").append(d).append(" ").append(HH).append(":").append(mm).append(
                ":").append(ss);
        datetime = sb.toString();
        Date date = DateFormat.getDateInstance().parse(datetime);

        SimpleDateFormat formatter;
        formatter = new SimpleDateFormat ("yyyy-MM-dd HH:mm:ss");
        String ctime = formatter.format(date);
        System.out.println(ctime); //2008-02-01 00:00:00

        //如果是整型的話可以這樣轉換的
        long t = System.currentTimeMillis();//獲得當前系統毫秒數,這個是1900年到現在的毫秒數
        Date da = new Date(t);
        System.out.println(formatter.format(da));//2009-05-03 14:03:01
    }