Question

我正在尝试使用Jena阅读本体论。我在代码中显示的正确目录中有一个文件Pizza.owl，但我仍然收到一个错误，即找不到该文件。

public static void ReadOntology(){

OntModel onto = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM, null);
String inputFileName = "C:\\Users\\najib\\studies\\pizza.owl";

try {
    Logger logger = Logger.getLogger(Operations.class); 

    PropertyConfigurator.configure("C://Users//najib//Downloads//apache-jena-2.12.0//jena-log4j.properties");
//create the reasoning model using the base
    OntModel model = ModelFactory.createOntologyModel();
// use the FileManager to find the input file
    InputStream in = FileManager.get().open(inputFileName);
    if (in == null) {
        throw new IllegalArgumentException("File: " + inputFileName + " not found");
    }
    model.read(in, "");
//to list classes
    ExtendedIterator<OntClass> classes = model.listClasses();
    while (classes.hasNext()) {
        OntClass cls = (OntClass) classes.next();
        System.out.println("Classes: " + cls.getLocalName());
        for (ExtendedIterator<OntClass> i = cls.listSubClasses(true); i.hasNext();) {
            OntClass c = (OntClass) i.next();
            System.out.print(" " + c.getLocalName() + "\n");
        } // end for
    }
} catch (Exception e) {
    System.out.println(e);
    }
}

}

我收到以下错误：java.lang.IllegalArgumentException: File: C:\Users\najib\studies\pizza.owl not found

Answer 1

当我阅读FileManager的javadoc时，我发现您必须在文件参数前加上"file:"

所以（没有测试这个答案）我建议尝试：

String inputFileName = "file:/C:/Users/najib/studies/pizza.owl";

java.lang.IllegalArgumentException：找不到文件

1 个答案: