代码优化 public String getApplyId() { ValueOperations<String,Long> value = redisTemplate.opsForValue(); LocalDateTime dateTime = LocalDateTime.now(); String date = dateTime.format(DateTimeFormatter.ofPattern("yyMMdd")); Long count = 0L; String append = "Reconciliation:AD" + date; String dateString = "AD" + date; if (value.get(append) == null) { // 获取数据库的值 LambdaQueryWrapper<ReconciliationApply> wrapper = new LambdaQueryWrapper<>(); wrapper.eq(ReconciliationApply::getPurchaseCode, dateString); ReconciliationApply selectOne = applyMapper.selectOne(wrapper); if (selectOne == null) { value.setIfAbsent(append, count); redisTemplate.expire(append, 1, TimeUnit.DAYS); } else { String purchaseCode = selectOne.getPurchaseCode(); String substring = purchaseCode.substring(8, 13); value.setIfAbsent(append, Long.parseLong(substring)); redisTemplate.expire(append, 1, TimeUnit.DAYS); } } Long increment = value.increment(append, 1); String str = String.valueOf(increment); return getSequence(dateString, str); } /** * 格式化 key * * @param str * @return */ public static String getSequence(String dateString, String str) { StringBuilder stringJoiner = new StringBuilder(dateString); int len = str.length(); // 取决于业务规模 4 if (len == DEFAULT_LENGTH) { return stringJoiner.append(str).toString(); } if (str.length() > DEFAULT_LENGTH) { throw new RuntimeException("申请单号已使用完成，请明天再申请"); } int rest = DEFAULT_LENGTH - len; for (int i = 0; i < rest; i++) { stringJoiner.append("0"); } stringJoiner.append(str); return stringJoiner.toString(); }

可以考虑对代码进行如下优化：

1. 将 Redis 的操作放到单独的方法中，方便复用和维护。

2. 对于 Redis 中的值的获取和设置，可以使用 Redis 的 get/set 方法代替 opsForValue() 方法，简化代码。

3. 对于 Redis 中的键的格式，可以使用 String.format() 方法代替 StringBuilder，使代码更加简洁。

4. 对于日期和时间的格式化，可以使用 Java 8 中的 DateTimeFormatter 做进一步优化。

综上所述，代码可以优化为：

public String getApplyId() {
    LocalDateTime dateTime = LocalDateTime.now();
    String dateString = "AD" + dateTime.format(DateTimeFormatter.ofPattern("yyMMdd"));
    String key = String.format("Reconciliation:%s", dateString);
    ValueOperations<String, String> valueOps = redisTemplate.opsForValue();

    String value = valueOps.get(key);
    if (value == null) {
        ReconciliationApply apply = applyMapper.selectOne(
                new LambdaQueryWrapper<ReconciliationApply>().eq(ReconciliationApply::getPurchaseCode, dateString));
        if (apply == null) {
            valueOps.setIfAbsent(key, "0001");
        } else {
            String purchaseCode = apply.getPurchaseCode();
            String suffix = purchaseCode.substring(8);
            valueOps.setIfAbsent(key, suffix);
        }
        redisTemplate.expire(key, 1, TimeUnit.DAYS);
    }
    long sequence = valueOps.increment(key, 1);
    String str = String.format("%04d", sequence);
    return dateString + str;
}