SyndFeed feed = getFeed(req);
String feedType = req.getParameter(FEED_TYPE);
feedType = (feedType!=null) ? feedType : _defaultFeedType;
feed.setFeedType(feedType);
//..... Loop to add SyndEntry objects to SyndFeed
res.setContentType(MIME_TYPE);
SyndFeedOutput output = new SyndFeedOutput();
output.output(feed,res.getWriter());