How use XSD and Java? What classes/methods?

Question

I want to use an XSD instead of a DTD with my XML and Java. Does anyone know the classes/methods I should use to do this? Is it even possible? Can you send sample code?

Answer 1

here is the helper function... hope it helps...
import java.io.IOException;
import java.math.*;
import java.text.*;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.ErrorHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;
public class SAXParserDemo
     public SAXParserDemo()
     public void performDemo(String uri)
          System.out.println("Parsing XML file: " + uri + "\n\n");
          ContentHandler contentHandler = new MyContentHandler();
          ErrorHandler errorHandler = new MyErrorHandler();
          try
               XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
               parser.setContentHandler(contentHandler);
               parser.setErrorHandler(errorHandler);
               parser.setFeature("http://xml.org/sax/features/validation", true);
               parser.parse(uri);
          catch(IOException e)
               System.out.println("Error reading URI: " + e);
          catch(SAXException e)
               System.out.println("Error in parsing: " + e);
     public static void main(String[] args)
          if(args.length != 1)
               System.out.println("Usage: java SAXParserDemo [XML URI]");
               System.exit(0);
          String uri = args[0];
          SAXParserDemo parserDemo = new SAXParserDemo();
          parserDemo.performDemo(uri);
class MyErrorHandler implements ErrorHandler
     public void warning(SAXParseException exception) throws SAXException
          throw new SAXException("Warning encountered."+exception);
     public void error(SAXParseException exception) throws SAXException
          throw new SAXException("Error encountered: "+exception);
     public void fatalError(SAXParseException exception) throws SAXException
          throw new SAXException("Fatal error encountered."+exception);
class MyContentHandler implements ContentHandler
     private Locator locator;
     public void setDocumentLocator(Locator locator)
          //System.out.println("     * setDocumentLocator() called");
          this.locator = locator;
     public void startDocument() throws SAXException
          //System.out.println("System Message: Parsing begins...");
     public void endDocument() throws SAXException
          //System.out.println("System Message: ...Parsing ends.");
     public void processingInstruction(String target, String data) throws SAXException
          //System.out.println("System Message: PI: Target: "+target+" and Data: "+data);
     public void startPrefixMapping(String prefix, String uri)
          //System.out.println("System Message: Mapping starts on prefix "+prefix+" mapped to URI "+uri);
     public void endPrefixMapping(String prefix)
          //System.out.println("System Message: Mapping ends on prefix "+prefix);
     public void startElement(String namespaceURI, String localName, String rawName, Attributes atts) throws SAXException
          //System.out.println("System Message: startElement: "+localName);
          if(!namespaceURI.equals(""))
               //System.out.println("System Message: in namespace "+namespaceURI+" ("+rawName+")");
          else
               //System.out.println("System Message: has no associated namespace");
          int i;
          for(i=0;i<atts.getLength();i++)
               //System.out.println("System Message: Attribute: "+atts.getLocalName(i)+"="+atts.getValue(i));
     public void endElement(String namespaceURI, String localName, String rawName) throws SAXException
          //System.out.println("System Message: endElement: "+localName+"\n");
     public void characters(char[] ch, int start, int length) throws SAXException
          String s = new String(ch, start, length);
          //System.out.println("System Message: characters: "+s);
     public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException
          String s = new String(ch, start, length);
          //System.out.println("System Message: ignorableWhitespace: ["+s+"]");
     public void skippedEntity(String name) throws SAXException
          //System.out.println("System Message: Skipping entity: "+name);
}