环境依赖：
//spingBoot <version>2.6.6</version>
//jdk11
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
代码简单易理解直接上成品；
package com.wyj.my_redis.util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* @author: yijun.wen
* @date: 2022/4/15 11:00 上午
* @description:
*/
@Component
public class OrderGenerateUtils {
@Autowired
private RedisTemplate redisTemplate;
/**
* 全局自增数
*/
private static int count = 1;
/**
* 格式化的时间字符串
*/
private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
private String REDIS_ORDER_NUM_KEY_PRE = "fms:order:";
/**
* 生成16位订单编号:8位日期+2位业务场景+6位以上 Redis 自增 id
*
* @param type 业务场景
* @return
*/
public String getOrderNum(int type) {
StringBuilder sb = new StringBuilder();
String date = getNowDateStr();
// 拼接key值
String key = REDIS_ORDER_NUM_KEY_PRE + date;
Long increment = incr(key, count);
sb.append(date);
// （动态匹配）2位业务场景 1：支付宝，2：微信，3：订单编号
sb.append(String.format("%02d", type));
String incrementStr = increment.toString();
if (incrementStr.length() <= 6) {
sb.append(String.format("%06d", increment));
} else {
sb.append(incrementStr);
}
return sb.toString();
}
/***
*
* @param key
* @param delta
* @return
*/
public Long incr(String key, long delta) {
Long increment = redisTemplate.opsForValue().increment(key, delta);
if (increment.equals(1L)) {
redisTemplate.expire(key, 1, TimeUnit.DAYS);
}
return redisTemplate.opsForValue().increment(key, delta);
}
/**
* 获取当前时间年月日字符串
*
* @return
*/
private static String getNowDateStr() {
return sdf.format(new Date());
}
}
