用Jena通过SPARQL读取RDF内容

package sh.pl;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import com.hp.hpl.jena.ontology.OntModel;
import com.hp.hpl.jena.ontology.OntModelSpec;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.ModelFactory;

public class TestJena {

	public static void main(String args[]) throws IOException {

		OntModel ontModel = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);

		URL url = new URL("http://jvn.jp/rss/jvn.rdf");		

		HttpURLConnection connect = (HttpURLConnection) url.openConnection();
		InputStream in = url.openStream();
		ontModel.read(in, "");
		String queryString = "PREFIX rss:   <http://purl.org/rss/1.0/> SELECT ?item_title ?item_link"
				+
				" WHERE " + "{ ?item rss:title ?item_title " +

				"FILTER regex(?item_title, \"MAC\", \"i\" ) ." +

				"?item rss:link ?item_link }";

		Query query = QueryFactory.create(queryString);
		QueryExecution qe = QueryExecutionFactory.create(query, ontModel);
		ResultSet results = qe.execSelect();
		
		while (results.hasNext()) {
			QuerySolution qs = results.next();
			System.out.println(qs.get("item_title"));
			System.out.println(qs.get("item_link"));
		}

		// ResultSetFormatter.out(System.out, results, query);
		qe.close();
	}

}