Aggregate feeds

To aggregate multiple feeds into one feed you only have to parse the desired feeds and add their entries to a new feed:

List<SyndEntry> entries = new ArrayList<SyndEntry>();

// parse feeds
SyndFeedInput input = new SyndFeedInput();
for (File file : files) {
    SyndFeed feed = input.build(file);
    entries.addAll(feed.getEntries());
}

// create aggregated feed
SyndFeed aggregationFeed = new SyndFeedImpl();
aggregationFeed.setFeedType("rss_2.0");
aggregationFeed.setTitle("Aggregator Feed");
aggregationFeed.setLink("https://example.org/feed");
aggregationFeed.setDescription("Description");
aggregationFeed.setPublishedDate(new Date());
aggregationFeed.setEntries(entries);

// output aggregated feed
String xml = new SyndFeedOutput().outputString(aggregationFeed);
System.out.println(xml);

Note

SyndFeedInput supports additional input types. Please take a look at the Javadoc.

Note

SyndFeedOutput supports additional output formats. Please take a look at the Javadoc.

For more details take a look at the guides for reading and creating feeds.