Tutorial Addendum On XML Technologies - XSD Validation in Java

Using SAXParserFactory to Amount Parsers

    

Xerces-J amalgamation can aswell be loaded by the SAXParserFactory.newInstance()

    

method. Actuality is my SAXValidator.java:

    

 

    
/**

    
 * SAXValidator.java

    
 * Absorb (c) 2002 by Dr.  Yang

    
 */

    
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 SAXValidator {

    
   accessible changeless abandoned main(String[] args) {

    
      Cord schemaFeature 

    
         = "http://apache.org/xml/features/validation/schema";

    
      try {

    
      	 Book x = new File(args[0]);

    
         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());

    
         DefaultHandler h = new MyErrorHandler();

    
         p.parse(x,h);

    
      } bolt (ParserConfigurationException e) {

    
         System.out.println(e.toString()); 

    
      } bolt (SAXException e) {

    
         System.out.println(e.toString()); 

    
      } bolt (IOException e) {

    
         System.out.println(e.toString()); 

    
      }

    
   }

    
   clandestine changeless chic MyErrorHandler extends DefaultHandler {

    
      accessible abandoned warning(SAXParseException e) throws SAXException {

    
         System.out.println("Warning: "); 

    
         printInfo(e);

    
      }

    
      accessible abandoned error(SAXParseException e) throws SAXException {

    
         System.out.println("Error: "); 

    
         printInfo(e);

    
      }

    
      accessible abandoned fatalError(SAXParseException e) throws SAXException {

    
         System.out.println("Fattal error: "); 

    
         printInfo(e);

    
      }

    
      clandestine abandoned printInfo(SAXParseException e) {

    
      	 System.out.println("   Accessible ID: "+e.getPublicId());

    
      	 System.out.println("   Arrangement ID: "+e.getSystemId());

    
      	 System.out.println("   Band number: "+e.getLineNumber());

    
      	 System.out.println("   Cavalcade number: "+e.getColumnNumber());

    
      	 System.out.println("   Message: "+e.getMessage());

    
      }

    
   }

    
}

    

Note that the action affection to the SAXParserFactory object.

    

Now if you run the program with:

    

 

    
java -cp . dictrionary_invalid_xsd.xml

    

You will get:

    

 

    
org.apache.crimson.jaxp.SAXParserFactoryImpl@1004901

    
org.xml.sax.SAXNotRecognizedException: Feature: http://apache.org/xml

    
/features/validation/schema

    

Note that the blood-soaked amalgamation was loaded from the J2SDK library, and it

    

doesn t abutment XSD validation.

    

But if you run the program with:

    

 

    
java -cp .;localxerces-2_3_0xercesImpl.jar dictrionary_invalid_xsd.xml

    

you will get:

    

 

    
org.apache.xerces.jaxp.SAXParserFactoryImpl@f72617

    
org.apache.xerces.jaxp.SAXParserImpl@173831b

    
...

    

Note that the xerces amalgamation was loaded, and XSD validation was performed.