import com.sun.syndication.fetcher.FetcherException; //导入依赖的package包/类
@Override
public void poll() {
	try {
		feedFetcher.retrieveFeed(URL_object);
	} catch (IllegalArgumentException | IOException | FeedException | FetcherException e) {
		// TODO Proper error handling
		e.printStackTrace();
	}	
}
 

import com.sun.syndication.fetcher.FetcherException; //导入依赖的package包/类
@SuppressWarnings("unchecked")
public void start(String rssurl) throws AdapterException {
    FeedFetcher feedFetcher = new HttpURLFeedFetcher();
	try {
		feed = feedFetcher.retrieveFeed(new URL(rssurl));
	    feediterator = (Iterator<SyndEntry>) feed.getEntries().iterator();
	} catch (IllegalArgumentException | IOException	| FeedException | FetcherException e) {
		feediterator = null;
		feed = null;
		throw new AdapterException(e);
	}
}
 

import com.sun.syndication.fetcher.FetcherException; //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.FetcherException; //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;
	}