小编dev*_*per的帖子

我想使用 Java 查询 DBPedia。下面是我的代码，它没有返回正确的结果。我想从 [ http://dbpedia.org/page/Ibuprofen页面和标签名称中获取摘要部分。但它只返回http://dbpedia.org/resource/Ibuprofen 11 次。如果可能，你能告诉我错误在哪里吗？这是我的代码：

import org.apache.jena.query.ParameterizedSparqlString;
import org.apache.jena.query.QueryExecution;
import org.apache.jena.query.QueryExecutionFactory;
import org.apache.jena.query.ResultSet;
import org.apache.jena.query.ResultSetFormatter;
import org.apache.jena.rdf.model.Literal;
import org.apache.jena.rdf.model.ResourceFactory;

public class JavaDBPediaExample {

    public static void main(String[] args) {
        ParameterizedSparqlString qs = new ParameterizedSparqlString(""
                + "prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#>\n"
                + "PREFIX dbo:     <http://dbpedia.org/ontology/>"
                + "\n"
                + "select ?resource where {\n"
                + "  ?resource rdfs:label ?label.\n"
                + "  ?resource dbo:abstract ?abstract.\n"
                + "}");

        Literal ibuprofen = ResourceFactory.createLangLiteral("Ibuprofen", "en");
        qs.setParam("label", ibuprofen);

        QueryExecution exec = QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql", qs.asQuery());

        ResultSet results …