Represents an USGS/Atom feeds - Java Network

Java examples for Network:RSS

  1. HOME
  2. Java
  3. Network
  4. RSS

Description

Represents an USGS/Atom feeds

Demo Code




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;

//extra stuff needed by atom feed
import com.sun.syndication.feed.synd.SyndLinkImpl;
import com.sun.syndication.feed.synd.SyndCategoryImpl;
import com.sun.syndication.feed.synd.SyndContentImpl;

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

    Date lastUpdated = new Date();
    Date mostRecent = new Date();

    private List entries = new ArrayList();

    String[] urls = {//from w ww  .  jav a  2s  .co m
    "http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_day.atom" };

    public FeedAtom() {
        feed = new SyndFeedImpl();
        feed.setFeedType("atom_0.3"); //not sure of v0.3 or v1.0
        feed.setTitle("Atom Aggregated Feed");
        feed.setDescription("Combine Atom 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));

                //entries.addAll(inFeed.getEntries());

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

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

            } catch (Exception ex) {
                ex.printStackTrace();
                System.out.println("ERROR (line 95): " + ex.getMessage());
            }
        }

        lastUpdated = mostRecent;
    } //end parseFeed()

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

    public Date getLastUpdate() {
        return lastUpdated;
    }

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

    //tester/client
    public static void main(String args[]) {
        DateFormat df = new SimpleDateFormat("yyyy-M-d HH:mm:ss z");
        FeedAtom myfeed = new FeedAtom();
        List<SyndLinkImpl> links = null;

        while (true) {
            myfeed.parseFeed();
            if (myfeed.isUpdated()) {
                System.out.println("Most recent entry: "
                        + df.format(myfeed.lastUpdated));
                for (SyndEntry entry : myfeed.getEntries()) {
                    System.out.println("Title: " + entry.getTitle());
                    System.out.println("URI: " + entry.getUri());
                    System.out.println("Updated Date: "
                            + df.format(entry.getUpdatedDate()));

                    //One Atom entry might have multiple URL links
                    links = entry.getLinks();
                    SyndLinkImpl firstLink = links.get(0);
                    System.out.println("URL: " + firstLink.getHref());

                    System.out.print("<a href=\"" + firstLink.getHref()
                            + "\">");
                    System.out.print(entry.getTitle());
                    System.out.print("</a>");
                }
            }
            try {
                Thread.sleep(60000); //wait 60 seconds
            } catch (InterruptedException ie) {
                ie.printStackTrace();
                System.out.println("ERROR: " + ie.getMessage());
            }
        }
    }
}

Related Tutorials