RSS 和 Atom

从 Spring Framework 7.0 开始，org.springframework.web.servlet.view.feed 包中的视图类已被弃用。取而代之的是，库可以调整此现有代码以提供其自己的 *View 类型支持。作为替代方案，应用程序可以在 Web 处理程序中执行直接渲染。

AbstractAtomFeedView 和 AbstractRssFeedView 都继承自 AbstractFeedView 基类，分别用于提供 Atom 和 RSS Feed 视图。它们基于 ROME 项目，位于 org.springframework.web.servlet.view.feed 包中。

AbstractAtomFeedView 要求您实现 buildFeedEntries() 方法并可选地覆盖 buildFeedMetadata() 方法（默认实现为空）。以下示例展示了如何实现：

Java
Kotlin

public class SampleContentAtomView extends AbstractAtomFeedView {

	@Override
	protected void buildFeedMetadata(Map<String, Object> model,
			Feed feed, HttpServletRequest request) {
		// implementation omitted
	}

	@Override
	protected List<Entry> buildFeedEntries(Map<String, Object> model,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
		// implementation omitted
	}
}

class SampleContentAtomView : AbstractAtomFeedView() {

	override fun buildFeedMetadata(model: Map<String, Any>,
			feed: Feed, request: HttpServletRequest) {
		// implementation omitted
	}

	override fun buildFeedEntries(model: Map<String, Any>,
			request: HttpServletRequest, response: HttpServletResponse): List<Entry> {
		// implementation omitted
	}
}

实现 AbstractRssFeedView 也有类似的要求，如下例所示：

Java
Kotlin

public class SampleContentRssView extends AbstractRssFeedView {

	@Override
	protected void buildFeedMetadata(Map<String, Object> model,
			Channel feed, HttpServletRequest request) {
		// implementation omitted
	}

	@Override
	protected List<Item> buildFeedItems(Map<String, Object> model,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
		// implementation omitted
	}
}

class SampleContentRssView : AbstractRssFeedView() {

	override fun buildFeedMetadata(model: Map<String, Any>,
								feed: Channel, request: HttpServletRequest) {
		// implementation omitted
	}

	override fun buildFeedItems(model: Map<String, Any>,
			request: HttpServletRequest, response: HttpServletResponse): List<Item> {
		// implementation omitted
	}
}

buildFeedItems() 和 buildFeedEntries() 方法传入 HTTP 请求，以防您需要访问 Locale。HTTP 响应仅用于设置 cookie 或其他 HTTP 头。方法返回后，Feed 会自动写入响应对象。

有关创建 Atom 视图的示例，请参阅 Alef Arendsen 的 Spring Team Blog 条目。