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I want to parse a xml file using a SAXParser or XMLReader and verify that the file conforms to a specific xsd file (new File( "example.xsd" )).
It's easy to
do the validation against a xsd file in an extra step using a Validator like in this SO answer.
to validate while parsing by specifying the name of the xsd as "http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation" like in this SO answer.
But how can I validate against a new File( "example.xsd" ) while parsing?
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newSchema(schemaFile); // create a Validator instance, which can be used to validate an instance document Validator validator = schema. newValidator(); // validate the DOM tree try { validator. validate(new StreamSource(new File("instance. xml")); } catch (SAXException e) { // instance document is invalid! }
You can validate your XML documents against XML schemas only; validation against DTDs is not supported. However, although you cannot validate against DTDs, you can insert documents that contain a DOCTYPE or that refer to DTDs.
XML documents are validated by the Create method of the XmlReader class. To validate an XML document, construct an XmlReaderSettings object that contains an XML schema definition language (XSD) schema with which to validate the XML document.
Assuming Java 5 or above, set the schema on the SAXParserFactory:
SchemaFactory schemaFactory = SchemaFactory
.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = schemaFactory.newSchema(new File("myschema.xsd"));
SAXParserFactory saxFactory = SAXParserFactory.newInstance();
saxFactory.setSchema(schema);
SAXParser parser = saxFactory.newSAXParser();
parser.parse("data.xml", new DefaultHandler() {
// TODO: other handler methods
@Override
public void error(SAXParseException e) throws SAXException {
throw e;
}
});
You handle validation errors by overriding the error method on your handler and acting as you see fit.
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