如何在Spring MVC中设置缓存头？

Question

在基于注释的Spring MVC控制器中，为特定路径设置缓存头的首选方法是什么？

Answer 1

org.springframework.web.servlet.support.WebContentGenerator，这是所有Spring控制器的基类，有很多处理缓存头的方法：

/* Set whether to use the HTTP 1.1 cache-control header. Default is "true".
 * <p>Note: Cache headers will only get applied if caching is enabled
 * (or explicitly prevented) for the current request. */
public final void setUseCacheControlHeader();

/* Return whether the HTTP 1.1 cache-control header is used. */
public final boolean isUseCacheControlHeader();

/* Set whether to use the HTTP 1.1 cache-control header value "no-store"
 * when preventing caching. Default is "true". */
public final void setUseCacheControlNoStore(boolean useCacheControlNoStore);

/* Cache content for the given number of seconds. Default is -1,
 * indicating no generation of cache-related headers.
 * Only if this is set to 0 (no cache) or a positive value (cache for
 * this many seconds) will this class generate cache headers.
 * The headers can be overwritten by subclasses, before content is generated. */
public final void setCacheSeconds(int seconds);

它们可以在内容生成之前在控制器中调用，也可以在Spring上下文中指定为bean属性。