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我的代碼:如何產生是我爲sparql執行寫的代碼是否正確?
package sample;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
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.ResultSet;
import com.hp.hpl.jena.query.ResultSetFormatter;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
public class QueryTest {
public static void main(String[] args) throws IOException {
InputStream in = new FileInputStream(new File("foaf-ijd.rdf"));
Model model = ModelFactory.createMemModelMaker().createDefaultModel();
model.read(in, null);
in.close();
String queryString = "SELECT ?x WHERE (?x, <http://www.w3.org/2001/vcard-rdf/3.0#FN>, 'John Smith')";
Query query = QueryFactory.create(queryString);
QueryExecution qe = QueryExecutionFactory.create(query, model);
ResultSet results = qe.execSelect();
ResultSetFormatter.out(System.out, results, query);
qe.close();
}
}
錯誤
Exception in thread "main" java.lang.NoSuchMethodError: org.slf4j.Logger.trace(Ljava/lang/String;)V
at com.hp.hpl.jena.sparql.lib.SystemUtils.chooseClassLoader(SystemUtils.java:23)
at com.hp.hpl.jena.sparql.lib.Metadata.init(Metadata.java:45)
at com.hp.hpl.jena.sparql.lib.Metadata.get(Metadata.java:75)
at com.hp.hpl.jena.query.ARQ.<clinit>(ARQ.java:253)
at com.hp.hpl.jena.query.Query.<clinit>(Query.java:54)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:71)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:43)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:31)
at sample.QueryTest.main(QueryTest.java:29)
*