public Result queryById(Long id) {`
    if (id == null) {
        return Result.fail("id为空");
    }
    String key = CACHE_SHOP_KEY + id;
    String shopJson = stringRedisTemplate.opsForValue().get(key);
    if (StrUtil.isNotBlank(shopJson)) {
        return Result.ok(shopJson);
    }
    Shop shop = getById(id);
    if (shop == null) {
        return Result.fail("商户不存在");
    }
    stringRedisTemplate.opsForValue().set(key, JSONUtil.toJsonStr(shop), Duration.ofMinutes(CACHE_SHOP_TTL));
    return Result.ok(shop);
}

如果从Redis中取出Json字符串后直接返回，那么前端接收到的数据是这样的

因此需要先转成对象再返回

public Result queryById(Long id) {
    if (id == null) {
        return Result.fail("id为空");
    }
    String key = CACHE_SHOP_KEY + id;
    String shopJson = stringRedisTemplate.opsForValue().get(key);
    if (StrUtil.isNotBlank(shopJson)) {
        Shop shopBean = JSONUtil.toBean(shopJson, Shop.class);
        return Result.ok(shopBean);
    }

    Shop shop = getById(id);
    if (shop == null) {
        return Result.fail("商户不存在");
    }
    stringRedisTemplate.opsForValue().set(key, JSONUtil.toJsonStr(shop), Duration.ofMinutes(CACHE_SHOP_TTL));
    return Result.ok(shop);
}

那么前端接收到的数据是这样的