Spring 缓存抽象
使用注解缓存方法结果
Spring 缓存抽象 是 CoddyKit 上的免费 Spring Boot 4 Microservices & REST APIs 课时。 这是第 1 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Spring Boot 4 Microservices & REST APIs 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Spring Boot 4 Microservices & REST APIs 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Why Caching
Caching stores the result of expensive operations so repeated calls return instantly from memory instead of recomputing or re-querying.
- Lower latency
- Less database load
- Better throughput
The Cache Abstraction
Spring provides a cache abstraction — a uniform API over many backends (in-memory, Redis, Caffeine). You annotate methods; Spring handles the storage.
Enabling Caching
Add @EnableCaching to a configuration class to turn on annotation processing.
@Configuration
@EnableCaching
public class CacheConfig {
}The CacheManager
A CacheManager owns the named caches. Spring Boot auto-configures one based on what is on the classpath.
@Autowired
CacheManager cacheManager;
Cache productCache = cacheManager.getCache("products");Default In-Memory Cache
With no cache library on the classpath, Spring Boot uses a simple ConcurrentMapCacheManager backed by a map.
Named Caches
Each cached method targets a named cache. Names let you tune and clear caches independently.
@Cacheable("products")
public Product findById(Long id) {
return repository.findById(id).orElseThrow();
}How a Cache Hit Works
On call, Spring builds a key, checks the cache: if present (a hit), it returns the stored value and skips the method body. On a miss, it runs the method and stores the result.
Cache Keys
By default the key is derived from the method arguments. You can override it with a SpEL expression.
@Cacheable(value = "products", key = "#id")
public Product findById(Long id) { ... }Choosing a Provider
Add a library to switch backends automatically: Caffeine for fast local caching, Redis for a shared distributed cache.
// build.gradle for Caffeine
implementation "com.github.ben-manes.caffeine:caffeine"Configuring Caffeine
Caffeine supports size limits and expiry via properties.
# application.properties
spring.cache.cache-names=products
spring.cache.caffeine.spec=maximumSize=500,expireAfterWrite=600sWhen Not to Cache
Caching suits read-heavy, slow-changing data. Avoid it for rapidly changing values or when stale reads are unacceptable without proper eviction.
Quick Check
Test your understanding of the cache abstraction.
Recap
You learned the cache abstraction:
@EnableCachingturns the feature on- A
CacheManagerowns named caches - Default backend is an in-memory ConcurrentMap
- Swap to Caffeine or Redis by adding the library
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常见问题解答
「Spring 缓存抽象」课时是免费的吗？
是的 — 「Spring 缓存抽象」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Spring Boot 4 Microservices & REST APIs 课程的其余内容，请升级到 CoddyKit PRO。 Spring Boot 4 Microservices & REST APIs 课程共包含 4 节课。
「Spring 缓存抽象」这节课中我会学到什么？
使用注解缓存方法结果 你通过在浏览器中直接运行的动手代码来练习 Spring Boot 4 Microservices & REST APIs，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Spring Boot 4 Microservices & REST APIs 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Spring Boot 4 Microservices & REST APIs 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 1 节课，共 4 节。
「Spring 缓存抽象」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Spring Boot 4 Microservices & REST APIs 课中编写并运行代码吗？
能。每节 Spring Boot 4 Microservices & REST APIs 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。