RSS和Atom

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，并位于org.springframework.web.servlet.view.feed包中。

AbstractAtomFeedView要求您实现buildFeedEntries()方法，并可选择重写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()方法会传入HTTP请求，以便在需要访问Locale时使用。HTTP响应仅用于设置Cookie或其他HTTP头。在方法返回后，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团队博客文章。