java - How to implement: when entering a list page, different products are displayed every time? Details enter

Question

For example, a mall has 10 merchants, each of which has many products. The demand is: every time the user refreshes the page, he will see different products from different merchants. It is not as simple as random product IDs, because it may be repeated. How to implement it specifically?

迷茫 · Answer

If it is an in-memory database (which may be used by large shopping websites), you can use caching.

If not, it is recommended to implement it on the front-end page. The background is responsible for retrieving data.