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时间格式生成序列【主键】

public class GenerateSequenceUtil {	     /** .log *///    private static final Logger logger = Logger.getLogger(GenerateSequenceUtil.class);     /** The FieldPosition. */    private static final FieldPosition HELPER_POSITION = new FieldPosition(0);     /** This Format for format the data to special format. */    private final static Format dateFormat = new SimpleDateFormat("MMddHHmmssS");     /** This Format for format the number to special format. */    private final static NumberFormat numberFormat = new DecimalFormat("0000");     /** This int is the sequence number ,the default value is 0. */    private static int seq = 0;     private static final int MAX = 9999;     /**     * 时间格式生成序列     * @return String     */    public static synchronized String generateSequenceNo() {         Calendar rightNow = Calendar.getInstance();         StringBuffer sb = new StringBuffer();         dateFormat.format(rightNow.getTime(), sb, HELPER_POSITION);         numberFormat.format(seq, sb, HELPER_POSITION);         if (seq == MAX) {            seq = 0;        } else {            seq++;        } //        logger.info("THE SQUENCE IS :" + sb.toString());         return sb.toString();    }    public static void main(String[] args) {		System.out.println(GenerateSequenceUtil.generateSequenceNo());	}}

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