Redis实现生成自增流水号

    @Override
    public String generate(String bizCode) {
        //** 获取今天的日期:yyyyMMdd *//*
        String date = com.i2p.util.DateUtils.getCurentDate();
        String key = "serial.number:" + date;
        //** 自增 *//*
        long sequence = this.incr(key);
        String seq = SequenceUtils.getSequence(sequence);
        StringBuilder sb = new StringBuilder();
        sb.append(bizCode).append(seq);
        String serial = sb.toString();
        return serial;
    }

package com.i2p.util;

public class SequenceUtils {

    static final int DEFAULT_LENGTH = 4;
    public static String getSequence(long seq) {
        String str = String.valueOf(seq);
        int len = str.length();
        if (len >= DEFAULT_LENGTH) {// 取决于业务规模,应该不会到达4
            return str;
        }
        int rest = DEFAULT_LENGTH - len;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < rest; i++) {
            sb.append('0');
        }
        sb.append(str);
        return sb.toString();
    }
}

/**
     * 得到系统当前日期
     * "yyyyMMdd"
     */
    public static String getCurentDate() {
        SimpleDateFormat tempDate = new SimpleDateFormat("yyyyMMdd");
        String datetime = tempDate.format(new java.util.Date());
        return datetime;
    }