Tree like view of Triplets and remove URI's - eclipse

Question

I have written a code in java that reads the ontology and print the triplets. the code is working fine. i want to hide the URI's in output and also print the output in the tree hierarchy form. Currently it gives me output in lines. Any idea how can i do this.
Tree Form Like:
Thing
Class
SubClass
Individual
so on ...
this is the ReadOntology class, this class i use in servlet.
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());
}
}
this is the 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());
}
}
}

Answer 1

As one step towards your goal, this groups the statements by subject, and for the predicates only shows the local name:
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());
}
}
There are lots of useful methods in the API for Resource and Model.
To render a full class tree, use the methods on OntModel and OntClass. Perhaps:
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
}
Then in the service method, iterate over the OntModel's classes, and for any where hasSuperClass() is false, call printClass(out, clazz, 0).