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XML validation: Difference between revisions
→Java: Added implementation
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}
</lang>
=={{header|Java}}==
<lang java>import static javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI;
import java.net.MalformedURLException;
import java.net.URL;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import javax.xml.ws.Holder;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
public class XmlValidation {
public static void main(String... args) throws MalformedURLException,
SAXException {
URL schemaLocation = new URL("http://venus.eas.asu.edu/WSRepository/xml/Courses.xsd");
URL documentLocation = new URL("http://venus.eas.asu.edu/WSRepository/xml/Courses.xml");
if (validate(schemaLocation, documentLocation)) {
System.out.println("document is valid");
} else {
System.out.println("document is invalid");
}
}
public static boolean validate(URL schemaLocation, URL documentLocation) {
SchemaFactory factory = SchemaFactory.newInstance(W3C_XML_SCHEMA_NS_URI);
final Holder<Boolean> valid = new Holder<>(true);
try {
Validator validator = factory.newSchema(schemaLocation).newValidator();
// Get some better diagnostics out
validator.setErrorHandler(new ErrorHandler(){
@Override
public void warning(SAXParseException exception)
throws SAXException {
System.out.println("warning: " + exception.getMessage());
}
@Override
public void error(SAXParseException exception)
throws SAXException {
System.out.println("error: " + exception.getMessage());
valid.value = false;
}
@Override
public void fatalError(SAXParseException exception)
throws SAXException {
System.out.println("fatal error: " + exception.getMessage());
throw exception;
}});
validator.validate(new StreamSource(documentLocation.toString()));
return valid.value;
} catch (SAXException e) {
// Already reported above
return false;
} catch (Exception e) {
// If this is the only thing that throws, it's a gross error
System.err.println(e);
return false;
}
}
}</lang>
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