最近項目遇到一個需求，單號從001開始遞增

下面用到了redis處理

代碼如下：

public String getId() {String key = "providerManager";Long incr = getIncr(key);if (incr == 0) {incr = getIncr(key);//從001開始}DecimalFormat df = new DecimalFormat("000");//三位序列號return df.format(incr);
}public Long getIncr(String key) {RedisAtomicLong entityIdCounter = new RedisAtomicLong(key, redisTemplate.getConnectionFactory());Long increment = entityIdCounter.getAndIncrement();return increment;
}

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效果如下圖所示