java - 如何在Spring Controller 中注入(inject)Cache-Control max-age header ？

我在Spring控制器中有以下方法：

public Response myMethod (@PathVariable("id") String id,
        @RequestParam(required = false) Map<String, Object> queryString,
        @RequestHeader(value = HttpHeaders.ACCEPT, required = false) String acceptHeader,
        @RequestHeader(value = HttpHeaders.CACHE_CONTROL, required = false, defaultValue = 1) String expiration,
        @RequestHeader(value = HttpHeaders.FROM) String appId) {
// ...
}

在这里，我使用@RequestHeader提取整个Cache Control标头。是否有一种方法只能通过注入或通过专用Spring类进行进一步解析来获取max-age部分？还是我必须手动进行？

谢谢

最佳答案

您可能可以定义一个类，例如：CacheControlMaxAge，然后是Converter<HttpRequest, CacheControlMaxAge>，最后将参数声明为
一个CacheControlMaxAge

@Getter
@RequiredArgsConstructor
public class CacheControlMaxAge {
  private final int maxAge;
}

@Component
public class CacheControlMaxAgeConverter implements Converter<HttpRequest, CacheControlMaxAge> {

  public CacheControlMaxAge convert(HttpRequest request) {
    // todo: extract stuff from request
    return new CacheControlMaxAge(...);
  }
}

public Response blah(..., CacheControlMaxAge cacheControl) { ... }