W3CHINA.ORG讨论区--[求助]如何在java中调用已经建好的本体？

贴子主题： [求助]如何在java中调用已经建好的本体？

本主题类别: Ontology Engineering

import java.util.Iterator;

import com.hp.hpl.jena.db.DBConnection;
import com.hp.hpl.jena.db.IDBConnection;
import com.hp.hpl.jena.ontology.Individual;
import com.hp.hpl.jena.ontology.OntClass;
import com.hp.hpl.jena.ontology.OntModel;
import com.hp.hpl.jena.ontology.OntModelSpec;
import com.hp.hpl.jena.ontology.OntProperty;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.ModelMaker;
import com.hp.hpl.jena.util.iterator.ExtendedIterator;

/* 连接数据库 */
public class text1{

public static IDBConnection connectDB(String DB_URL, String DB_USER,
String DB_PASSWD, String DB_NAME) {
    return new DBConnection(DB_URL, DB_USER, DB_PASSWD, DB_NAME);
}

/* 从文件读取本体并将其存入数据库 */
public static OntModel createDBModelFromFile(IDBConnection con, String name,
   String filePath) {
    ModelMaker maker = ModelFactory.createModelRDBMaker(con);
    Model base = maker.createModel(name);
    OntModel newmodel = ModelFactory.createOntologyModel(
getModelSpec(maker), base);
    newmodel.read(filePath);
    return newmodel;
}

/* 从数据库中得到已存入本体 */
public static OntModel getModelFromDB(IDBConnection con, String name) {
    ModelMaker maker = ModelFactory.createModelRDBMaker(con);
    Model base = maker.getModel(name);
    OntModel newmodel = ModelFactory.createOntologyModel(
getModelSpec(maker), base);
    return newmodel;
}

public static OntModelSpec getModelSpec(ModelMaker maker) {
    OntModelSpec spec = new OntModelSpec(OntModelSpec.OWL_MEM);
    spec.setImportModelMaker(maker);
    return spec;
}

/*下面是测试的代码，先从文件中读取，让后存入数据库中，再从数据库中读出。*/
public static void test() {
    String DB_URL = "jdbc:mysql://localhost/ontodb";
    String DB_USER = "root";
    String DB_PASSWD = "123";
    String DB = "MySQL";
    String DB_DRIVER = "com.mysql.jdbc.Driver";

    try {
        Class.forName("com.mysql.jdbc.Driver");
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }

    String filePath = "file:d://Electronic_medical_records.owl";
    IDBConnection con = text1.connectDB(DB_URL,DB_USER, DB_PASSWD, DB);
    System.out.println(con);

   text1.createDBModelFromFile(con, "Disease",filePath);
    OntModel model = JaneUtils.getModelFromDB(con, "Disease");
    JaneUtils.SimpleReadOntology(model);
    getInstance(model);
}

/* 简单读取本体中的各个class */
public static void SimpleReadOntology(OntModel model) {
    for (Iterator i = model.listClasses(); i.hasNext();) {
        OntClass c = (OntClass) i.next();
        System.out.println(c.getLocalName());
    }
}
/* 获取个体及其属性值 */
public static void getInstance(OntModel model) {
    String NS = "http://www.owl-ontologies.com/Ontology1271230855.owl#";
    /* 得到本体中的Expert类 */
    OntClass expert = model.getOntClass(NS + "1234");
    // 打印类名
    System.out.println(expert.getLocalName());

    // 获得其所以个体
    ExtendedIterator it = expert.listInstances();
    // 打印其个体
   // System.out.println(it.toList().size());
    while (it.hasNext()) {
        Individual oi = (Individual) it.next();
        for (Iterator ipp = expert.listDeclaredProperties(); ipp.hasNext();) {
            OntProperty p = (OntProperty) ipp.next();
            System.out.println("  associated property: " + p.getLocalName()
                    + " : " + oi.getPropertyValue(p));
        }// property ends
    }
}

public static void main(String[] args) {
test();
}
}

这个是近日我研究的代码已经能够显示出类来，但是不能显示实例请高手指点下错误。


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