spring使用rssfeed

spring使用rssfeed

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;

    }

}