RSS and Atom

`AbstractAtomFeedView`和`AbstractRssFeedView`均继承自`AbstractFeedView`基类并且分别用于提供 Atom 和 RSS Feed 视图。它们基于 ROME项目，并位于包`org.springframework.web.servlet.view.feed`中。

AbstractAtomFeedView 要求您实现 buildFeedEntries() 方法，也可以选择覆盖 buildFeedMetadata() 方法（默认实现为空）。以下示例展示了如何执行此操作：

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
	}
}

与实现 AbstractRssFeedView 相关的要求类似，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() 方法传递 HTTP 请求（如果您需要访问区域设置）。只将 HTTP 响应传递用于设置 Cookie 或其他 HTTP 标头。方法返回后，会自动将 Feed 写入响应对象。

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