Silly me,
I just forgot to urlencode the query string. Once that was done the
rest of the code works!
On Apr 13, 2008, at 1:58 PM, Andrew (Chuan) Khoo wrote:
> Hi all,
>
> I wonder if anyone here has experience going through this problem
> before.
>
> I'm trying to access my locally-installed sparql endpoint through the
> URL object in java, and it always returns me with a http 400 error,
> even though tests with just a simple browser query (get or post) will
> work properly. Here is my test java code:
>
>
> URL queryURL;
> URLConnection urlConn;
>
> public SparqlQuery() {
>
> String msg = "default-graph-uri=http://
> dbpedia.org&format=application/sparql-results
> +xml&debug=on&query=SELECT ?p ?o WHERE {
> <http://dbpedia.org/resource/Metropolitan_Museum_of_Art
>> ?p ?o }";
> byte[] msgAsBytes = msg.getBytes();
>
> try {
> queryURL = new URL("http://localhost:8890/sparql";);
> urlConn = queryURL.openConnection();
> ((HttpURLConnection) urlConn).setRequestMethod("POST");
>
> urlConn.setDoOutput(true);
> urlConn.setDoInput(true);
> urlConn.setUseCaches(false);
>
> OutputStream oStream = urlConn.getOutputStream();
> oStream.write(msgAsBytes);
> oStream.flush();
>
> BufferedReader in = new BufferedReader(new
> InputStreamReader(urlConn.getInputStream()));
>
> String aLine = "";
> while ((aLine = in.readLine()) != null) {
> System.out.println(aLine);
>
> }
>
> in.close();
> oStream.close();
>
> } catch (MalformedURLException e) {
> e.printStackTrace();
> } catch (IOException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
>
> }
>
>
> Some help on working with this will be very much appreciated. As I've
> mentioned, accessing the dbpedia data via standard http requests, and
> even via actionscript works pretty well, but not java.
>
>
> Thanks,
> Andrew
>
>
>
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