On Sun, Nov 10, 2013 at 9:28 AM, Luciane Monteiro <[email protected]> wrote: > Yes, I did this: ( Here response is a List<DBpediaResource> ) > > Model model = ModelFactory.createDefaultModel(); > List<String> uriList = new ArrayList<String>(); > > > for( DBpediaResource dbResource : response ) { > > String uri = dbResource.getFullUri(); > uriList.add(uri); > } > > for( String uri : uriList ) { > > Resource resource = model.createResource(uri); > StmtIterator stmts = resource.listProperties(RDFS.comment); > > while( stmts.hasNext() ) { > > Statement stmt = stmts.next(); > RDFNode comment = stmt.getObject(); > > System.out.println("Comment: " + comment.toString()); > } > } > > But when I try to print the Comment it returns me nothing. Is there anything > wrong?
When you say it "returns you nothing", do you mean that you don't get any output at all, or that you're getting "Comment: null" (i.e., that comment.toString() is returning null for some values)? At any rate, it looks like you're doing a lot more work than you need to. When you read the remote content (e.g., with model.read(...) or RDFDataMgr.read(model, uri) as Andy mentioned) you get a model back. Then you can either ask the model for statements directly, or you can get a resource for http://dbpedia.org/resource/Google directly and then ask for properties from it. E.g.: import com.hp.hpl.jena.rdf.model.Model; import com.hp.hpl.jena.rdf.model.ModelFactory; import com.hp.hpl.jena.rdf.model.RDFNode; import com.hp.hpl.jena.rdf.model.Resource; import com.hp.hpl.jena.rdf.model.ResourceFactory; import com.hp.hpl.jena.rdf.model.StmtIterator; import com.hp.hpl.jena.vocabulary.RDFS; public class DBpediaExample { final static String DBPEDIA_GOOGLE = "http://dbpedia.org/resource/Google";; public static void main(String[] args) { // Create a model and read the DBpedia content into it. final Model model = ModelFactory.createDefaultModel().read( DBPEDIA_GOOGLE ); // Create a resource not associate with any model, and ask the model // for statements with it as a subject and rdfs:comment as the property. // null (for the object) is a wildcard. You could also use a resource // that is associated with a model (e.g., model.createResource( dbpediaGoogle )). final Resource google1 = ResourceFactory.createResource( DBPEDIA_GOOGLE ); StmtIterator stmts1 = model.listStatements( google1, RDFS.comment, (RDFNode) null ); showObjects( stmts1 ); // Create a resource based on the model. This one is based on the model, // so when you ask for its properties, you're asking about statements in // the same model. final Resource google2 = model.getResource( DBPEDIA_GOOGLE ); showObjects( google2.listProperties( RDFS.comment )); } public static void showObjects( final StmtIterator it ) { while ( it.hasNext() ) { System.out.println( it.next().getObject() ); } } } -- Joshua Taylor, http://www.cs.rpi.edu/~tayloj/
