This section describes a tutorial example on how to the Xerces2 SAXParser class included in JDK 1.7 to perform XSD validation on an XML document. The XSD document must be specified with SAXParser.setProperty() method.
To fix the XSD loading problem with SAXValidator.java, I revised the program using
the SAXParser.setProperty() method to set the XSD document explicitly:
/* SAXValidatorJdk17.java
- Copyright (c) 2013, HerongYang.com, All Rights Reserved.
*/
import java.io.File;
import java.io.IOException;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
class SAXValidatorJdk17 {
public static void main(String[] args) {
String schemaFeature
= "http://apache.org/xml/features/validation/schema";
try {
File x = new File(args[0]);
String schemaLocation = args[1];
SAXParserFactory f = SAXParserFactory.newInstance();
System.out.println(f.toString());
f.setValidating(true);
f.setFeature(schemaFeature,true);
SAXParser p = f.newSAXParser();
System.out.println(p.toString());
p.setProperty(
"http://apache.org/xml/properties/schema"
+"/external-noNamespaceSchemaLocation",schemaLocation);
p.setProperty(
"http://java.sun.com/xml/jaxp/properties/schemaLanguage",
"http://www.w3.org/2001/XMLSchema");
DefaultHandler h = new MyErrorHandler();
p.parse(x,h);
} catch (ParserConfigurationException e) {
System.out.println(e.toString());
} catch (SAXException e) {
System.out.println(e.toString());
} catch (IOException e) {
System.out.println(e.toString());
}
}
private static class MyErrorHandler extends DefaultHandler {
public void warning(SAXParseException e) throws SAXException {
System.out.println("Warning: ");
printInfo(e);
}
public void error(SAXParseException e) throws SAXException {
System.out.println("Error: ");
printInfo(e);
}
public void fatalError(SAXParseException e) throws SAXException {
System.out.println("Fattal error: ");
printInfo(e);
}
private void printInfo(SAXParseException e) {
System.out.println(" Public ID: "+e.getPublicId());
System.out.println(" System ID: "+e.getSystemId());
System.out.println(" Line number: "+e.getLineNumber());
System.out.println(" Column number: "+e.getColumnNumber());
System.out.println(" Message: "+e.getMessage());
}
}
}
Run it on JDK 1.7:
c:\Progra~1\Java\jdk1.7.0_07\bin\javac SAXValidatorJdk17.java
c:\Progra~1\Java\jdk1.7.0_07\bin\java SAXValidatorJdk17
dictionary_invalid_xsd.xml dictionary.xsd
com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl@1833955
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl@4b82d2
Error:
Public ID: null
System ID: file:/C:/herong/dictionary_invalid_xsd.xml
Line number: 3
Column number: 49
Message: cvc-complex-type.3.2.2: Attribute
'xsi:noNamespaceSchemaLocation' is not allowed to appear in element
'dictionary'.
Error:
Public ID: null
System ID: file:/C:/herong/dictionary_invalid_xsd.xml
Line number: 7
Column number: 22
Message: cvc-datatype-valid.1.2.1: 'yes' is not a valid value for
'boolean'.
...
Interestingly, the "xerces" implementation included in JDK 1.7
does not like the attribute xsi:noNamespaceSchemaLocation="..." used
in the XML document to specify the XSD document.