spring使用rssfeed

控制器

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import mypackage.rss.view.RssFeedView;

/**
* 栏目稿件RSS订阅请求控制器类。
*
*/
@Controller
@RequestMapping({"/rss/c/{columnId}"})
public class ColumnStoriesRssController {

@RequestMapping("")
public ModelAndView feed() {
ModelAndView modelAndView = new ModelAndView();
// TODO 从本地缓存获取稿件数据

modelAndView.addObject(RssFeedView.ITEMS_KEY, null);
modelAndView.setView(new RssFeedView());
return modelAndView;
}
}


 RSS Feed 视图类

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jdom2.Element;
import org.springframework.web.servlet.view.feed.AbstractRssFeedView;

import mypackage.domain.model.NrCompoStory;
import mypackage.domain.model.NrGalleryStory;
import mypackage.domain.model.NrStory;
import mypackage.domain.model.NrVideoStory;
import mypackage.framework.infras.exception.UnexpectedException;
import com.rometools.rome.feed.rss.Channel;
import com.rometools.rome.feed.rss.Item;

/**
* RSS Feed 视图类。
*
*/
public class RssFeedView extends AbstractRssFeedView {

/**
* RSS稿件列表KEY
*/
public static final String ITEMS_KEY = "RSS_ITEMS";

/**
* {@inheritDoc}
*/
@Override
protected Channel newFeed() {
Channel channel = new Channel("rss_2.0");
channel.setTitle("${title}");
channel.setLink("${link}");
channel.setEncoding("UTF-8");
channel.setDescription("${description}");
return channel;
}

/**
* {@inheritDoc}
*/
@Override
protected List<Item> buildFeedItems(Map<String, Object> model,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
@SuppressWarnings("unchecked")
List<NrStory> stories = (List<NrStory>)model.get(ITEMS_KEY);
List<Item> result = new ArrayList<Item>();
if (stories != null) {
for (NrStory story : stories) {
result.add(createItem(story));
}
}

return result;
}

/**
* 通过稿件创建RSS Item
*
* @param story 稿件
* @return RSS Item
*/
private Item createItem(NrStory story) {
Item result = null;
if (story instanceof NrCompoStory) {
result = createCompoItem((NrCompoStory)story);
} else if (story instanceof NrGalleryStory) {
result = createGalleryItem((NrGalleryStory)story);
} else if (story instanceof NrVideoStory) {
result = createVideoItem((NrVideoStory)story);
} else {
throw new UnexpectedException("unknow story type.(" + story.getClass().getName() + ")");
}

return result;
}

/**
* 通过图文稿件创建RSS Item
*
* @param story 稿件
* @return RSS Item
*/
private Item createCompoItem(NrCompoStory story) {
Item result = new Item();
result.setTitle("");
result.setLink("");
result.setDescription(null);
result.setPubDate(null);
Element element = null;

// <videoItems>
// <videoItem>
// (see detail in next page)
// </videoItem>
// …...
// </videoItems>
result.setForeignMarkup(Arrays.asList(element));

return result;
}

/**
* 通过图集稿件创建RSS Item
*
* @param story 稿件
* @return RSS Item
*/
private Item createGalleryItem(NrGalleryStory story) {

return null;
}

/**
* 通过视频稿件创建RSS Item
*
* @param story 稿件
* @return RSS Item
*/
private Item createVideoItem(NrVideoStory story) {

return null;
}
}