qianduan/chao/src/main/java/com/zt/util/OrderId.java

package com.zt.util;


import redis.clients.jedis.Jedis;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;


public class OrderId {
    private static final String REDIS_HOST = "localhost";
    private static final int REDIS_PORT = 6379;
    private static final String ORDER_KEY_PREFIX = "order:counter:";
    private static final int ORDER_SEQ_LENGTH = 5;

    public static void main(String[] args) {
        String orderNumber = generateOrderNumber("ORD");
        String orderNumber2 = generateOrderNumber("ORD");
        System.out.println("生成的订单号: " + orderNumber);
        System.out.println("生成的订单号: " + orderNumber2);
    }

    public static String generateOrderNumber(String prefix) {
            Jedis jedis = new Jedis(REDIS_HOST, REDIS_PORT);
            // 获取当前日期，格式化为yyMMdd
            String datePart = LocalDateTime.now()
                    .format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"));
            // Redis键名，按日期分隔计数器
            String redisKey = ORDER_KEY_PREFIX + datePart;
            // 原子递增并获取序列号
            long seq = jedis.incr(redisKey);
            // 格式化序列号，不足长度时前补零
            String seqPart = String.format("%0" + ORDER_SEQ_LENGTH + "d", seq);
            // 组合完整订单号: 前缀+日期+序列号
            return prefix + datePart + seqPart;
    }
}