前言
首先看一個spring官方的issue，https://github.com/spring-projects/spring-framework/issues/18370
Caffeine intends to supersede the caching support in the Google Guava library with an actively maintained Java 8+ version in standalone form.
We’re going to introduce first-class Caffeine support in Spring 4.3 and should consider dropping our then-outdated Guava caching support in Spring 5.0.
大概意思就是spring4.3開始支持caffeine(咖啡因)，spring 5.0 也就是springboot 2.0 ，放棄對guava cache的支持。
如何快速切換
我們項目中，可能用的guava cache比較多，官方也給了適配器，讓我們去迅速切換。
官方鏈接： https://github.com/ben-manes/caffeine
gradle
compile 'com.github.ben-manes.caffeine:guava:2.8.4'
maven
<dependency>
<groupId>com.github.ben-manes.caffeine</groupId>
<artifactId>guava</artifactId>
</dependency>
- 結合前面博客中兩級緩存的例子，坐下迅速切換，上圖
