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Figure 9-5. Browsing our servlet-generated feed
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The major objects used here RssDocument, RssChannel, and RssChannelItem correspond exactly with the elements that are required in the RSS feed. If RSS4J does not meet your needs, it would be fairly easy to extend. Alternatively, the open source Element Construction Set (ECS) from Jakarta at http://jakarta.apache.org/ecs/ provides a tool for building this sort of document while still avoiding much of the complexity of DOM.
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In this chapter, we discussed the origins of RSS and the various available flavors. We introduced you to an RSS browser application and demonstrated how you can incorporate an RSS feed into your portal. Finally, we showed how you can create an RSS feed from your own applications using the RSS4J library. In the next chapter, we will show you how to incorporate search tools into your portlets and applications.
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M OST PORTAL APPLICATION deployments require a search engine. Portals usually unify content and applications from across an organization, and users may not know where to go to find their information. Deploying a well-thought-out, integrated search engine inside your portal is not just about the search engine technology used some thought and design has to go into the overall information architecture of the portal and its component portlet applications. An important consideration is content delivery and display within the portal. How are you going to present the user with HTML content In our example, we deliver HTML content from the file system through to the portal page when the user clicks on a search result. Knowledge of information retrieval terms and techniques is extremely useful when designing a search engine implementation, as is an understanding of the user s needs and requirements for search. Launching a limited trial period, a beta, or an initial implementation helps to gather user feedback and real-world results: What terms are users searching for Do they understand the query language Are they using the query language or other advanced features Is the indexed content the set of content they need
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Jakarta Apache Lucene (http://jakarta.apache.org/lucene) is an open source search engine written in Java and licensed under the Apache Software License. Lucene is not a full-featured search engine that is ready to plug in to your web application and go, like most commercial search engines. Lucene does not offer a default user interface, and you will need to develop your own integration code to plug it into your portal. Lucene also does not have any web crawlers or spiders, so you will be responsible for providing content to Lucene. Lucene has a well-defined Java API that abstracts most of the underlying information retrieval processing and concepts. Lucene s advantage is its flexibility. Because it makes no assumptions about what kind of repository your content is in, you can use Lucene in almost any Java application. Another advantage is that Lucene is open source, so if your search results are not what you expect, you can inspect the source code. Lucene also has
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a thriving community, and several third-party projects and tools are available that could be useful for your application. You ll find a collection of third-party contributions on the Lucene web page (http://jakarta.apache.org/lucene/docs/ contributions.html).
If you need a web crawler to spider your web site(s), try the open source project Nutch (www.nutch.org). Doug Cutting started the Nutch project and the Lucene project, and Nutch creates Lucene indexes.
Understanding how Lucene works requires knowledge of the key Lucene concepts, especially creating an index and querying an index. Most of Lucene is straightforward; we ve found that Lucene is easy to use once you see how a sample application works. We use a Lucene tag library in our portlet to speed up the development process although we used the tag library, you don t have to in your application.
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