Question

我有一个基于jsp的web应用程序，它使用tomcat作为j2ee服务器，请告诉我实现语义搜索的必要步骤？

我已添加以下代码。

  public String queryOntology(String val) throws OWLOntologyCreationException {

    OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
    OWLDataFactory dataFactory = manager.getOWLDataFactory();
    File ontologyFile = new File("D:\\onto.owl");
    OWLOntology psychiatricOntology = manager.loadOntologyFromOntologyDocument(ontologyFile);

    //OWLReasoner rStructral = new StructuralReasonerFactory().createReasoner(psychiatricOntology);
    OWLReasoner rHermit = new Reasoner.ReasonerFactory().createReasoner(psychiatricOntology);
    try {
        QueryEngine queryEng = QueryEngine.create(manager, rHermit);
        Query query = Query.create("SELECT ?c WHERE { Class(?c) }");
        QueryResult result = queryEng.execute(query);
        return result.toString();

    } catch (QueryParserException ex) {
        //return ex.getMessage();

    } catch (QueryEngineException ex) {
        ex.getMessage();
    } finally {
        rHermit.dispose();
        //rStructral.dispose();
    }
    return null;
}

上面的代码片段显示了为执行的查询返回字符串值的方法，并且它正确返回。但是当尝试检索java servlet中的值时会导致错误。

 protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //processRequest(request, response);
        String val = request.getParameter("query");
        PrintWriter out = response.getWriter();
        getInfo gi = new getInfo();

    request.getRequestDispatcher("header.jsp").include(request, response);
    out.print("<div id=content>");
    out.print(val);
    try {
        //gi.createIndex();
        //List<String> str = gi.createIndexSearcher(val);
        //out.print(str);
        out.print(gi.queryOntology(val));
    } catch (OWLOntologyCreationException ex) {
        Logger.getLogger(Search.class.getName()).log(Level.SEVERE, null, ex);
    }
    out.print("</div>");
    request.getRequestDispatcher("footer.jsp").include(request, response);

}

上面的代码在servlet中使用。我怎么解决这个问题？提前谢谢

这是我得到的错误屏幕的屏幕截图。 http://tinypic.com/r/2cnxj87/8

Answer 1

非常感谢你给予的帮助。为sparql-dl api添加必要的依赖项就行了。

使用sparql-dl和owlapi进行语义搜索

1 个答案: