Represents an aggregated list of CNN and Reuters RSS feeds into a single feed. - Java Network

Java examples for Network:RSS

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Description

Represents an aggregated list of CNN and Reuters RSS feeds into a single feed.

Demo Code

/** *************************************************
 * Represents an aggregated list of CNN and Reuters RSS feeds
 * into a single feed./* www  .ja  v  a  2  s.c  om*/
 *
 * Only works for RSS, not Atom.
 *
 * ************************************************** */



import java.net.URL;
import java.io.PrintWriter;
import java.util.List;
import java.util.ArrayList;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndFeedImpl;
import com.sun.syndication.io.SyndFeedOutput;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;

public class Feed {
    private SyndFeed feed = null;
    private SyndFeedOutput outFeed = null;

    //Date lastUpdated = new Date(0);
    //Date mostRecent  = new Date(1);
    //set date to minimum value to get all entries.
    //set date to now to get entries from now on-ward.
    Date lastUpdated = new Date();
    Date mostRecent = new Date();

    private List entries = new ArrayList();

    //only RSS feeds work. no Atom feeds.
    String[] urls = {
            "http://rss.cnn.com/rss/cnn_topstories.rss",
            "http://www.reuters.com/rssFeed/topNews",
            "http://feeds.bbci.co.uk/news/rss.xml",
            "http://america.aljazeera.com/content/ajam/articles.rss" };

    public Feed() {
        feed = new SyndFeedImpl();
        feed.setFeedType("rss_1.0");
        /*
        valid values are:   rss_0.9, rss_0.91U, rss_0.91N, rss_0.92, rss_0.93,
                            rss_0.94, rss_1.0, rss_2.0 & atom_0.3
         */

        feed.setTitle("RSS Aggregated Feed");
        feed.setDescription("Combine RSS feeds for Twitter Bot.");
        feed.setAuthor("None");
        feed.setLink("http://www.example.com");
    }

    /** *************************************************
     * This creates a news list with all the newest entries since
     * last run of parseFeed().
     *
     * ************************************************** */
    public void parseFeed() {
        entries = new ArrayList();
        feed.setEntries(entries);

        for (int i = 0; i < urls.length; ++i) {
            URL inputURL = null;
            SyndFeedInput input = null;
            SyndFeed inFeed = null;

            try {
                inputURL = new URL(urls[i]);
                input = new SyndFeedInput();
                inFeed = input.build(new XmlReader(inputURL));

                //create a whole new list and add the new items to it.
                for (SyndEntry entry : (List<SyndEntry>) inFeed
                        .getEntries()) {
                    if (entry.getPublishedDate().after(lastUpdated)) {
                        entries.add(entry);

                        //find the most recent entry (like finding the max value)
                        if (entry.getPublishedDate().after(mostRecent)) {
                            mostRecent = entry.getPublishedDate();
                        }
                    }
                }

            } catch (Exception ex) {
                ex.printStackTrace();
                System.out.println("ERROR: " + ex.getMessage());
            }
        }
        lastUpdated = mostRecent;
    }

    public boolean isUpdated() {
        return !entries.isEmpty();
    }

    public Date getLastUpdate() {
        return lastUpdated;
    }

    public List<SyndEntry> getEntries() {
        return entries;
    }

    public void output() {
        try {
            outFeed = new SyndFeedOutput();
            outFeed.output(feed, new PrintWriter(System.out), true);
        } catch (Exception ex) {
            ex.printStackTrace();
            System.out.println("ERROR: " + ex.getMessage());
        }
    }

    //tester/client
    public static void main(String args[]) {
        Feed myfeed = new Feed();
        DateFormat df = new SimpleDateFormat("M-d HH:mm:ss z");

        while (true) {
            myfeed.parseFeed();
            if (myfeed.isUpdated()) {
                System.out.println("Most recent entry: "
                        + df.format(myfeed.mostRecent));
                System.out.println("Most recent entry: "
                        + df.format(myfeed.lastUpdated));
                for (SyndEntry e : myfeed.getEntries()) {
                    System.out.println("Title: " + e.getTitle());
                    System.out.println("URL: " + e.getUri());
                    System.out.println("Pub Date: "
                            + df.format(e.getPublishedDate()));
                    System.out.println();
                }
            }
            try {
                Thread.sleep(10000); //wait 10 seconds
            } catch (InterruptedException ie) {
                ie.printStackTrace();
                System.out.println("ERROR: " + ie.getMessage());
            }
        }

    } //end main()
} //end class Feed

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