我用Java编写了一个代码,该代码读取本体并打印三元组。该代码工作正常。我想在输出中隐藏URI并以树层次结构形式输出输出。当前,它以行显示输出。不知道我该怎么做。
Tree Form Like:
Thing
Class
SubClass
Individual
so on ...
这是ReadOntology类,我在servlet中使用该类。
public class ReadOntology {
public static OntModel model;
public static void run(String ontologyInFile) {
model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM, null);
InputStream ontologyIn = FileManager.get().open(ontologyInFile);
loadModel(model, ontologyIn);
}
protected static void loadModel(OntModel m, InputStream ontologyIn) {
try {
m.read(ontologyIn, "RDF/XML");
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
这是servlet
public class Ontology extends HttpServlet{
OntClass ontClass = null;
public void service(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
{
PrintWriter out = res.getWriter();
ServletContext context = this.getServletContext();
String fullPath = context.getRealPath("/WEB-INF/Data/taxi.owl");
ReadOntology.run(fullPath);
SimpleSelector selector = new SimpleSelector(null, null, (RDFNode)null);
StmtIterator iter = ReadOntology.model.listStatements(selector);
while(iter.hasNext()) {
Statement stmt = iter.nextStatement();
out.print(stmt.getSubject().toString());
out.print(stmt.getPredicate().toString());
out.println(stmt.getObject().toString());
}
}
}
答案 0 :(得分:1)
迈向目标的第一步是按主题对语句进行分组,并且对于谓词仅显示本地名称:
ResIterator resIt = ReadOntology.model.listSubjects()
while (resIt.hasNext()) {
Resource r = resIt.nextResource();
out.println(r);
StmtIterator iter = r.listProperties();
while (iter.hasNext()) {
Statement stmt = iter.nextStatement();
out.print(" ");
out.print(stmt.getPredicate().getLocalName());
out.println(stmt.getObject());
}
}
要渲染完整的类树,请使用OntModel和OntClass上的方法。也许:
private void printClass(Writer out, OntClass clazz, int indentation) {
String space = ' '.repeat(indentation);
// print space + clazz.getLocalName()
...
// iterate over clazz.listSubClasses(true)
// and call printClass for each with indentation increased by 1
...
// iterator over clazz.listInstances()
// and print all their properties as in the
// snippet above but with space added
}
然后在service方法中,遍历OntModel的类,对于hasSuperClass()
为false的任何情况,调用printClass(out, clazz, 0)
。