qr code reader java app download Using the ROME Fetcher in Java

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7.3.2 Using the ROME Fetcher
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To understand how to use the ROME Fetcher, let s look at a simple example. Listing 7.4 is a partial listing of FeedFetcherTest.java, a command-line program that fetches, caches, and parses newsfeeds using the ROME Fetcher using either a disk cache via DiskFeedInfoCache or a memory cache via HashMapFeedInfoCache.
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Listing 7.4 FeedFetcherTest.java
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public class FeedFetcherTest implements FetcherListener { public static void main(String[] args) throws Exception { if (args.length < 2) { System.out.println( "USAGE: FeedFetcherTest [disk|memory] <feed-url>"); return; } new FeedFetcherTest(args[0], args[1]); } public FeedFetcherTest(String type, String url) throws Exception { FeedFetcherCache feedInfoCache = null; if ("disk".equals(type)) { File cache = new File("./cache"); if (!cache.exists()) cache.mkdirs(); feedInfoCache = new DiskFeedInfoCache(cache.getAbsolutePath());
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The ROME newsfeed utilities
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} else { feedInfoCache = new HashMapFeedInfoCache(); } FeedFetcher feedFetcher = new HttpURLFeedFetcher(feedInfoCache); feedFetcher.addFetcherEventListener(this); SyndFeed feed = feedFetcher.retrieveFeed(new URL(url));
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} public void fetcherEvent(FetcherEvent ev) { System.out.println("FetcherEvent received"); System.out.println(" eventType: " + ev.getEventType()); System.out.println(" urlString: " + ev.getUrlString()); }
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Let s discuss the finer points of listing 7.4. First, note that the class FeedFetcherb so we can listen to all events fired by the Fetcher. FeedFetcherTest requires two arguments. The first is the cache type, which must be either disk to cache to disk or memory to cache to memory. The second argument is the URL of the newsfeed to be fetched. In the main() method, we check to ensure that we have two arguments C and if we don t, we print a usage message and exit. Otherwise, we create an instance of the FeedFetcherTest class D, passing in args[0] for the cache type and args[1] for the newsfeed URL. FeedFetcherTest does all of its work in its constructor. If the cache type is disk E, we create a directory to serve as the cache and we create an instance of class DiskFeedInfoCache to manage the cache. This class is not part of ROME; we had to create it ourselves. (You can find the source code for DiskFeedInfoCache.java in the online examples.) Otherwise, we assume that the cache type is memory and we create an instance of the class HashMapFeedInfoCache F, which is part of the ROME Fetcher, to manage the in-memory cache. Once we ve got the cache set up, we create an instance of the HttpURLFeedFetcher G, add the FeedFetcherTest object as an event listener H, and use it to parse from the specified newsfeed URL I. When the ROME Fetcher retrieves the newsfeed, it will check to see whether the newsfeed has been updated since the last time it was fetched and fire a FEED_POLLED event. The fetcherEvent() method J will print that out to the console. If the newsfeed has been updated, the Fetcher will fetch it, parse it, and fire a FEED_RETRIEVED event. Otherwise, it will fire a FEED_UNCHANGED event and simply return the SyndFeed found in the cache.
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Test implements the FetcherListener interface
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Generating newsfeeds with ROME
Running the examples You can find complete instructions for building and running FeedFetcherTest in the directory java/ch07 of the online examples that accompany the book. Under the same directory, you ll also find the code for DiskFeedInfoCache.java and a version of the ParseFeed.java example, called ParseFeedFetcher.java, which has been retrofitted to use the ROME Fetcher. That should be more than enough to get you started with the ROME Fetcher. We ve reached the end of our discussion of parsing newsfeeds with ROME. Now let s move on to newsfeed generation.
7.4 Generating newsfeeds with ROME
Generating RSS and Atom newsfeeds with ROME is easy, thanks to the SyndFeed object model. Generally, all you need to do is create a SyndFeed object and set its properties. Then, add a collection of SyndEntry objects, set their properties, and write the newsfeed out using one of the 10 newsfeed formats supported by ROME. It s easy, but unfortunately, the process does not always result in a valid newsfeed especially when you generate Atom format, which has some strict requirements about links, ids, and authors. In this section, you ll learn how to use the SyndFeed model to generate valid RSS and Atom newsfeeds. Then in chapter 8, you ll learn how to check your newsfeeds for validity using FeedValidator.org. Once again, let s dive right into the code. The class GenerateFeed.java, shown in listing 7.5, creates a simple newsfeed with one entry and all the right properties needed to generate a valid RSS or Atom newsfeed. Take a minute to review it and then we ll cover the important points.
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