java - Jena 库未将输出写入外部 RDF/XML 文件

Question

我的 jena 库的写入方法有问题。 我有以下一段代码，应该将输出写入外部文件，但它没有这样做。

import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.vocabulary.*;
import com.hp.hpl.jena.rdf.model.impl.ModelCom;


public class Tutorial04 extends Object {

// some definitions
static String tutorialURI  = "http://hostname/rdf/tutorial/";
static String briansName   = "Brian McBride";
static String briansEmail1 = "brian_mcbride@hp.com";
static String briansEmail2 = "brian_mcbride@hpl.hp.com";
static String title        = "An Introduction to RDF and the Jena API";
static String date         = "23/01/2001";

@SuppressWarnings("unused")
public static void main (String args[]) {

    // some definitions
    String personURI    = "http://somewhere/JohnSmith";
    String givenName    = "John";
    String familyName   = "Smith";
    String fullName     = givenName + " " + familyName;
    // create an empty model
    Model model = ModelFactory.createDefaultModel();

    // create the resource
    //   and add the properties cascading style
    Resource johnSmith
      = model.createResource(personURI)
             .addProperty(VCARD.FN, fullName)
             .addProperty(VCARD.N,
                          model.createResource()
                               .addProperty(VCARD.Given, givenName)
                               .addProperty(VCARD.Family, familyName));

    // now write the model in XML form to a file
  //  model.write(System.out, "RDF/XML");
    model.write(System.out,"RDF/XML");
}

}

Answer 1

你有:

model.write(System.out,"RDF/XML");

其中表示“请将此模型的内容写入标准输出”，即不要写入任何命名文件。要将模型写入文件，您需要说出哪个文件:

String fileName = "your_file_name_here.rdf";
FileWriter out = new FileWriter( fileName );
try {
    model.write( out, "RDF/XML-ABBREV" );
}
finally {
   try {
       out.close();
   }
   catch (IOException closeException) {
       // ignore
   }
}