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  • 据时间生成唯一序列ID

    据时间生成唯一序列ID

    /**
     * <html>
     * <body>
     *  <P> Copyright 1994 JsonInternational</p>
     *  <p> All rights reserved.</p>
     *  <p> Created on 19941115</p>
     *  <p> Created by Jason</p>
     *  </body>
     * </html>
     */
    package cn.ucaner.alpaca.framework.utils.sequence;
    
    import java.text.DecimalFormat;
    import java.text.FieldPosition;
    import java.text.Format;
    import java.text.NumberFormat;
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    
    /**
    * @Package:cn.ucaner.common.utils.sequence   
    * @ClassName:GenerateSequenceUtil   
    * @Description:   <p> 根据时间生成唯一序列ID<br>
    *                 时间精确到秒,ID最大值为99999且循环使用</p>
    * @Author: - Jason 
    * @CreatTime:2017年10月26日 上午10:44:23   
    * @Modify By:   
    * @ModifyTime:  
    * @Modify marker:   
    * @version    V1.0
     */
    public class GenerateSequenceUtil {
        
        /**
         * 
         */
        private static final FieldPosition HELPER_POSITION = new FieldPosition(0);
        
        /** 时间:精确到秒 */
        private final static Format dateFormat = new SimpleDateFormat("YYYYMMddHHmmss");
        
        private final static NumberFormat numberFormat = new DecimalFormat("00000");
        
        private static int seq = 0;
         
        private static final int MAX = 99999;
        
        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++;
            }
     
            return sb.toString();
        }
    }
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  • 原文地址:https://www.cnblogs.com/jasonandy/p/9184848.html
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