-- 作者：frankyzf
-- 发布时间：5/19/2005 9:31:00 PM
-- jena使用中出现的错误，麻烦大家解答一下
我已经能够在jena中找到目标类的父类（输出的最后几行），可是在输出结果前面，却出现下面的提示：
请各位的高手给解答一下，该怎么样改进我的程序才能不输出错误提示 ---------- Java (No Parameter) ----------
WARN [main] (OntDocumentManager.java:1004) - An error occurred while attempting to read from <http://www.w3.org/2002/07/owl> (re-directed via the document mgr from <http://www.w3.org/2002/07/owl>). Error was 'rethrew: null'.
java.io.IOException
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:775)
at com.hp.hpl.jena.ontology.OntDocumentManager.read(OntDocumentManager.java:971)
at com.hp.hpl.jena.ontology.OntDocumentManager.loadImport(OntDocumentManager.java:919)
at com.hp.hpl.jena.ontology.OntDocumentManager.loadImports(OntDocumentManager.java:686)
at com.hp.hpl.jena.ontology.OntDocumentManager.loadImports(OntDocumentManager.java:635)
at com.hp.hpl.jena.ontology.impl.OntModelImpl.read(OntModelImpl.java:1908)
at com.hp.hpl.jena.ontology.impl.OntModelImpl.read(OntModelImpl.java:1846)
at Test.main(Test.java:18)
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:505)
at java.net.Socket.connect(Socket.java:455)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:371)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:483)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:220)
at sun.net.www.http.HttpClient.New(HttpClient.java:293)
at sun.net.www.http.HttpClient.New(HttpClient.java:305)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:698)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:650)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:575)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:799)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:1670)
at java.net.URLConnection.getContentEncoding(URLConnection.java:489)
at com.hp.hpl.jena.ontology.OntDocumentManager.read(OntDocumentManager.java:968)
... 6 more
com.hp.hpl.jena.shared.JenaException: rethrew: null
at com.hp.hpl.jena.ontology.OntDocumentManager.read(OntDocumentManager.java:978)
at com.hp.hpl.jena.ontology.OntDocumentManager.loadImport(OntDocumentManager.java:919)
at com.hp.hpl.jena.ontology.OntDocumentManager.loadImports(OntDocumentManager.java:686)
at com.hp.hpl.jena.ontology.OntDocumentManager.loadImports(OntDocumentManager.java:635)
at com.hp.hpl.jena.ontology.impl.OntModelImpl.read(OntModelImpl.java:1908)
at com.hp.hpl.jena.ontology.impl.OntModelImpl.read(OntModelImpl.java:1846)
at Test.main(Test.java:18)
Caused by: java.io.IOException
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:775)
at com.hp.hpl.jena.ontology.OntDocumentManager.read(OntDocumentManager.java:971)
... 6 more
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:505)
at java.net.Socket.connect(Socket.java:455)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:371)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:483)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:220)
at sun.net.www.http.HttpClient.New(HttpClient.java:293)
at sun.net.www.http.HttpClient.New(HttpClient.java:305)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:698)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:650)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:575)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:799)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:1670)
at java.net.URLConnection.getContentEncoding(URLConnection.java:489)
at com.hp.hpl.jena.ontology.OntDocumentManager.read(OntDocumentManager.java:968)
... 6 more
http://www.w3.org/2002/07/owl#Thing
http://www.w3.org/2000/01/rdf-schema#Resource
http://www.xfront.com/owl/ontologies/camera/#Camera
http://www.xfront.com/owl/ontologies/camera/#PurchaseableItem Output completed (29 sec consumed) - Normal Termination
上面红色的就是我要的结果 我的源程序就是：
[color=#0099ff]
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.rdf.arp.*;
import java.io.*;
import com.hp.hpl.jena.ontology.*;
import com.hp.hpl.jena.rdql.* ;
import java.util.*;
import java.util.Iterator;
public class Test
{
public static void main(String[] args)
{
OntModelSpec s = new OntModelSpec( OntModelSpec.OWL_MEM_RULE_INF );
OntDocumentManager dm = new OntDocumentManager();
dm.addAltEntry( "http://www.xfront.com/owl/ontologies/camera/",
"file:\\c:\\camera.owl");
s.setDocumentManager(dm);
OntModel m = ModelFactory.createOntologyModel(s,null);
m.read( "http://www.xfront.com/owl/ontologies/camera/" );
try{
OntClass on = m.getOntClass("http://www.xfront.com/owl/ontologies/camera/#Digital");
Iterator iter = on.listSuperClasses();
for( ; iter.hasNext();)
{
OntClass te = (OntClass) iter.next();
System.out.println(te.getURI());
}
} catch (Exception ex)
{
System.err.println("Exception: "+ex) ;
ex.printStackTrace(System.err) ;
}
}
} [/color]
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