首先看到 org.springframework.cache.annotation.SpringCacheAnnotationParser 类：

protected Collection<CacheOperation> parseCacheAnnotations(DefaultCacheConfig cachingConfig, AnnotatedElement ae) {
	Collection<CacheOperation> ops = null;

	Collection<Cacheable> cacheables = AnnotatedElementUtils.getAllMergedAnnotations(ae, Cacheable.class);
	if (!cacheables.isEmpty()) {
		ops = lazyInit(ops);
		for (Cacheable cacheable : cacheables) {
			ops.add(parseCacheableAnnotation(ae, cachingConfig, cacheable));
		}
	}
	Collection<CacheEvict> evicts = AnnotatedElementUtils.getAllMergedAnnotations(ae, CacheEvict.class);
	if (!evicts.isEmpty()) {
		ops = lazyInit(ops);
		for (CacheEvict evict : evicts) {
			ops.add(parseEvictAnnotation(ae, cachingConfig, evict));
		}
	}
	Collection<CachePut> puts = AnnotatedElementUtils.getAllMergedAnnotations(ae, CachePut.class);
	if (!puts.isEmpty()) {
		ops = lazyInit(ops);
		for (CachePut put : puts) {
			ops.add(parsePutAnnotation(ae, cachingConfig, put));
		}
	}
	Collection<Caching> cachings = AnnotatedElementUtils.getAllMergedAnnotations(ae, Caching.class);
	if (!cachings.isEmpty()) {
		ops = lazyInit(ops);
		for (Caching caching : cachings) {
			Collection<CacheOperation> cachingOps = parseCachingAnnotation(ae, cachingConfig, caching);
			if (cachingOps != null) {
				ops.addAll(cachingOps);
			}
		}
	}

	return ops;
}

这个方法会解析 Cacheable、CacheEvict、CachePut 和 Caching 4个注解，找到方法上的这4个注解后，会将注解中的参数解析出来，作为后续注解生效的一个依据。这里举例说一下 CacheEvict 注解。

CacheEvictOperation parseEvictAnnotation(AnnotatedElement ae, DefaultCacheConfig defaultConfig, CacheEvict cacheEvict) {
	CacheEvictOperation.Builder builder = new CacheEvictOperation.Builder();

	builder.setName(ae.toString());
	builder.setCacheNames(cacheEvict.cacheNames());
	builder.setCondition(cacheEvict.condition());
	builder.setKey(cacheEvict.key());
	builder.setKeyGenerator(cacheEvict.keyGenerator());
	builder.setCacheManager(cacheEvict.cacheManager());
	builder.setCacheResolver(cacheEvict.cacheResolver());
	builder.setCacheWide(cacheEvict.allEntries());
	builder.setBeforeInvocation(cacheEvict.beforeInvocation());

	defaultConfig.applyDefault(builder);
	CacheEvictOperation op = builder.build();
	validateCacheOperation(ae, op);

	return op;
}

CacheEvict 注解是用于缓存失效。这里代码会根据 CacheEvict 的配置生产一个 CacheEvictOperation 的类，注解上的 name、key、cacheManager 和 beforeInvocation 等都会传递进来。

另外需要将一下 Caching 注解，这个注解通过 parseCachingAnnotation 方法解析参数，会拆分成 Cacheable、CacheEvict、CachePut 注解，也就对应我们缓存中的增加、失效和更新操作。