关于多级缓存使用(nginx本地缓存、JVM进程缓存、redis缓存)

public class CaffeineConfig implements InitializingBean {

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Autowired
    private IItemService itemService;

    @Autowired
    private IItemStockService itemStockService;

    private static final ObjectMapper MAPPER = new ObjectMapper();

    @Override
    public void afterPropertiesSet() throws Exception {
        // 初始化缓存
        // 1.查询商品信息
        List<Item> itemList = itemService.list();
        // 2.放入缓存
        for (Item item : itemList) {
            // 2.1 item序列化为JSON
            String json = MAPPER.writeValueAsString(item);
            // 2.2 存入redis
            redisTemplate.opsForValue().set("item:id:" + item.getId(),json);
        }
        
        // 3.查询商品库存信息
        List<ItemStock> stockList = itemStockService.list();
        // 2.放入缓存
        for (ItemStock stock : stockList) {
            // 2.1 item序列化为JSON
            String json = MAPPER.writeValueAsString(stock);
            // 2.2 存入redis
            redisTemplate.opsForValue().set("item:stock:id:" + stock.getId(),json);
        }
    }
}