import com.sun.syndication.fetcher.FetcherEvent; //导入依赖的package包/类
@Override
public void fetcherEvent(final FetcherEvent event) {
    final String eventType = event.getEventType();
    if (FetcherEvent.EVENT_TYPE_FEED_POLLED.equals(eventType)) {
        System.out.println("\tEVENT: Feed Polled. URL = " + event.getUrlString());
    } else if (FetcherEvent.EVENT_TYPE_FEED_RETRIEVED.equals(eventType)) {
        System.out.println("\tEVENT: Feed Retrieved. URL = " + event.getUrlString() + " - " + event.getFeed().getEntries().size());
        event.getFeed().setUri(event.getUrlString());

        indexer.prepare();
        for (final Object object : event.getFeed().getEntries()) {
            final SyndEntry entry = (SyndEntry) object;
            indexer.index(event.getFeed(), entry);
        }
        indexer.commit();
    } else if (FetcherEvent.EVENT_TYPE_FEED_UNCHANGED.equals(eventType)) {
        System.out.println("\tEVENT: Feed Unchanged. URL = " + event.getUrlString());
    }
}
 

import com.sun.syndication.fetcher.FetcherEvent; //导入依赖的package包/类
private SyndFeed getFeed(SyndFeedInfo syndFeedInfo, String urlStr, HttpMethod method, int statusCode) throws IOException, HttpException, FetcherException, FeedException {

        if (statusCode == HttpURLConnection.HTTP_NOT_MODIFIED && syndFeedInfo != null) {
            fireEvent(FetcherEvent.EVENT_TYPE_FEED_UNCHANGED, urlStr);
            return syndFeedInfo.getSyndFeed();
        }

        SyndFeed feed = retrieveFeed(urlStr, method);
        fireEvent(FetcherEvent.EVENT_TYPE_FEED_RETRIEVED, urlStr, feed);
        return feed;
    }
 

import com.sun.syndication.fetcher.FetcherEvent; //导入依赖的package包/类
private SyndFeed getFeed(SyndFeedInfo syndFeedInfo, String urlStr, HttpMethod method, int statusCode) throws IOException, HttpException, FetcherException, FeedException {

		if (statusCode == HttpURLConnection.HTTP_NOT_MODIFIED && syndFeedInfo != null) {
		    fireEvent(FetcherEvent.EVENT_TYPE_FEED_UNCHANGED, urlStr);
		    return syndFeedInfo.getSyndFeed();
		}

		SyndFeed feed = retrieveFeed(urlStr, method);
		fireEvent(FetcherEvent.EVENT_TYPE_FEED_RETRIEVED, urlStr, feed);
		return feed;
	}