java根据时间生成唯一ID

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import java.text.DecimalFormat;import java.text.FieldPosition;import java.text.Format;import java.text.NumberFormat;import java.text.SimpleDateFormat;import java.util.Calendar;import org.apache.log4j.Logger;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();    }}
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