p37使用list結(jié)構(gòu) 配合stream流完成作業(yè)

@Override
public Result listShopType() {
    //從Redis查
    List<String> shopTypeCache = stringRedisTemplate.opsForList().range(CACHE_SHOP_TYPE_KEY, 0, -1);
    if (!CollectionUtils.isEmpty(shopTypeCache)){
        //如果存在 返回?cái)?shù)據(jù)
        List<ShopType> collect = shopTypeCache.stream().map((item) -> {
            ShopType shopType1 = JSONUtil.toBean(item, ShopType.class);
            return shopType1;
        }).collect(Collectors.toList());
        return Result.ok(collect);
    }
    // 如果不存在 去數(shù)據(jù)庫(kù)查
    List<ShopType> shopTypeList = lambdaQuery().orderByAsc(ShopType::getSort).list();
    if (CollectionUtils.isEmpty(shopTypeList)){
        return Result.fail("店鋪分類信息為空");
    }
    // 將對(duì)象轉(zhuǎn)換成json
    List<String> stringList = shopTypeList.stream().map((item) -> {
        String jsonShopType = JSONUtil.toJsonStr(item);
        return jsonShopType;
    }).collect(Collectors.toList());
    //保存到redis
    stringRedisTemplate.opsForList().leftPushAll(CACHE_SHOP_TYPE_KEY,stringList);
    stringRedisTemplate.expire(CACHE_SHOP_TYPE_KEY,2400, TimeUnit.MINUTES);
    return Result.ok(shopTypeList);
}