rss 开发实例 1 AbstractFeedServlet

package com.ouou.webapp.rss;

import com.sun.syndication.feed.synd.*;

import com.sun.syndication.io.FeedException;

import com.sun.syndication.io.SyndFeedOutput;

import com.ouou.webapp.servlet.AbstractLeyuanServlet;

import com.ouou.video.om.Videos;

import com.ouou.video.om.Category;

import com.ouou.video.om.Tags;

import com.ouou.util.VideoUtils;

import com.ouou.util.DomainUtil;

import com.ouou.util.ImagesUtil;

import com.ouou.util.DateUtil;

import com.ouou.schedule.ScheduleManager;

import com.leyuan.client.model.User;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.springframework.web.bind.RequestUtils;

import org.springframework.web.context.support.WebApplicationContextUtils;

import org.springframework.context.ApplicationContext;

import org.jdom.CDATA;

import org.jdom.Verifier;

import java.io.IOException;

import java.util.*;

import java.util.regex.Pattern;

import java.util.regex.Matcher;

import java.net.URLEncoder;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

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/**

* Created by IntelliJ IDEA.

* User: xingtao

* Date: 2006-9-11

* Time: 18:55:35

* To change this template use File | Settings | File Templates.

*/

public abstract class AbstractFeedServlet extends AbstractLeyuanServlet {

    private static final Log logger = LogFactory.getLog(AbstractFeedServlet.class);

    private static final String MIME_TYPE = "application/xml; charset=UTF-8";

    private static final String CONTENT_TYPE = "text/plain";

    private static final String COULD_NOT_GENERATE_FEED_ERROR = "Could not generate feed";

    protected static final String LANGUAGE = "zh-cn";

    protected static final String ENCODING = "UTF-8";

    protected ApplicationContext context;

    protected Properties copy_prop;

    protected ScheduleManager scheduleMgr;

    public void init() {

        try {

            super.init();

        } catch (ServletException e) {

            logger.error(e);

        }

        context = WebApplicationContextUtils.getWebApplicationContext(getServletContext());

        copy_prop = (Properties) context.getBean("copyright");

        scheduleMgr = (ScheduleManager) context.getBean("scheduleManager");

    }

    public void service(HttpServletRequest request, HttpServletResponse response)

        throws ServletException, IOException {

        try {

            String rss = RequestUtils.getStringParameter(request,"rss","rss_2.0");

            if(!"rss_2.0".equalsIgnoreCase(rss)&&!"atom_0.3".equalsIgnoreCase(rss)){

               rss = "rss_2.0";

            }

            String type = RequestUtils.getStringParameter(request,"type","recommemd");

            SyndFeed feed = getFeed(request,type);

            if(null==feed){

                showResult(response,FAIL,"未知的类型");

            }else{

                feed.setFeedType(rss);

                response.setContentType(MIME_TYPE);

                SyndFeedOutput output = new SyndFeedOutput();

                output.output(feed, response.getWriter());

            }

        } catch (FeedException ex) {

            String msg = COULD_NOT_GENERATE_FEED_ERROR;

            logger.error(ex);

            response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, msg);

        }

    }

    public SyndFeed getBaseFeed(){

        SyndFeed feed = new SyndFeedImpl();

        feed.setEncoding(ENCODING);

        feed.setLanguage(LANGUAGE);

        feed.setPublishedDate(Calendar.getInstance().getTime());

        feed.setCopyright(copy_prop.getProperty("copyright"));

        return feed;

    }

    public abstract SyndFeed getFeed(HttpServletRequest request,String type)

        throws IOException, FeedException;

    protected SyndFeed process(SyndFeed feed, List list){

       List entryList = new ArrayList();

       Properties prop = (Properties) context.getBean("video");

       String info = prop.getProperty("info");

       for(Videos videos:list){

            try{

                User user = umanager.getUserById(videos.getUserId());

                Category category = cmanager.getCateory(videos.getCateId());

                SyndEntry entry = new SyndEntryImpl();

                SyndContent description = new SyndContentImpl();

                entry.setTitle(replaceLegalXmlCcharacter(videos.getName()));

                String code = VideoUtils.genPlayCode(videos.getVideoId(),

                        videos.getCateId(), videos.getUserId(), 1000);

                String video_url = new StringBuffer(DomainUtil.getDefaultDomain()).append("/play/v_").append(code).append(".html").toString();

                String image_url = ImagesUtil.getDefaultCoverUrl(videos.getCoverUrl());

                String space_url = new StringBuffer(DomainUtil.getSpaceDomain()).append("/space/index/").append(user.getUserName()).toString();

                String category_url = new StringBuffer(DomainUtil.getDefaultDomain()).append("/category_disp/").append(videos.getCateId()).toString();

                List tags = tmanager.getTags(videos.getVideoId());

                StringBuffer buffer = new StringBuffer();

                for(Tags tag:tags){

                    try{

                        buffer.append(""+tag.getName()+"");

                    }catch(Exception e){

                        logger.error(e);

                    }

                }

                entry.setLink(video_url);

                entry.setAuthor(replaceLegalXmlCcharacter(user.getUserName()));

                entry.setPublishedDate(new Date(videos.getCreateTime().getTime()+8*60*60*1000));

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                description.setType(CONTENT_TYPE);

                String desc = info.replaceAll("#video_url",video_url);

                desc = desc.replaceAll("#image",image_url);

                desc = desc.replaceAll("#name",videos.getName());

                desc = desc.replaceAll("#space_url",space_url);

                desc = desc.replaceAll("#auther",user.getUserName());

                desc = desc.replaceAll("#category_url",category_url);

                desc = desc.replaceAll("#category_name",category.getName());

                desc = desc.replaceAll("#create_time",SHORT_SDF.format(videos.getCreateTime()));

                desc = desc.replaceAll("#total_time", DateUtil.totalTimeString(videos.getTotalTime()));

                desc = desc.replaceAll("#star",String.valueOf(videos.getStar()));

                desc = desc.replaceAll("#clicks",String.valueOf(videos.getClicks()));

                desc = desc.replaceAll("#comments",String.valueOf(videos.getComments()));

                desc = desc.replaceAll("#favorites",String.valueOf(videos.getFavorites()));

                desc = desc.replaceAll("#vote_num",String.valueOf(videos.getVoteNum()));

                desc = desc.replaceAll("#desc",videos.getDescription());

                desc = desc.replaceAll("#tag",buffer.toString());

                description.setValue(replaceLegalXmlCcharacter(desc));

                entry.setDescription(description);

                entryList.add(entry);

            }catch(Exception e){

                //logger.error(e);                

            }

        }        

        feed.setEntries(entryList);

        return feed;

    }

    public static String replaceLegalXmlCcharacter(String xml){

        String newXml = xml;

        for(int i = 0; i < xml.length(); i++){

            char ch = xml.charAt(i);

            if(!isChar(ch)){

                 //newXml = newXml.substring(0, i) + " " + newXml.substring(i+1);

                newXml = xml.replace(ch,' ');

            }            

        }

        return newXml;

    }

    public static boolean isChar(int c){

        

        if (c == '/n') return true;

        if (c == '/r') return true;

        if (c == '/t') return true;

        

        if (c < 0x20) return false;  if (c <= 0xD7FF) return true;

        if (c < 0xE000) return false;  if (c <= 0xFFFD) return true;

        if (c < 0x10000) return false;  if (c <= 0x10FFFF) return true;

        

        return false;

    }

}