How to validate a xml file against a given xsd file while parsing it with a sax parser?

Question

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?

McDowell · Accepted Answer · 2009-10-27 12:24:53Z

5

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.

answered Oct 27, 2009 at 12:24

McDowell

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2 Comments

tangens Over a year ago

It seems that the parser still uses the schema defined inside the xml file and not the one I set with schemaFactory( newSchema(...)).

McDowell Over a year ago

That isn't the behaviour I see (the parser always validates against the schema set on the factory, even if one is set in the document). Without sample documents/code, it is difficult to identify the problem.

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