[java] Validador Schemas

Código funcional e com riqueza de detalhes que facilitam a vida do desenvolvedor.

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package validadorxml;

import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Schema;
import javax.xml.XMLConstants;
import javax.xml.transform.sax.SAXSource;
import org.xml.sax.InputSource;
import javax.xml.validation.Validator;
import java.io.*;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.ErrorHandler;

/**
 *
 * @author Armando Roque
 * Copy´nPaste: http://www.herongyang.com/XML-Schema/JAXP-XSD-Schema-XML-Validator-Final-Version.html
 * Tradução livre pt-br
 * 
 */
public class Main {
  private static int errorCount = 0;
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
    if (args.length<2) {
      System.out.println("Use:");
      System.out.println("java -jar ValidadorXML nome_do_arquivo_do_schema.xsd "
        + "nome_do_arquivo.xml");
    } else {
      String schemaName = args[0];
      String xmlName = args[1];
      Schema schema = loadSchema(schemaName);
      validateXml(schema, xmlName);
    }
    }
  public static void validateXml(Schema schema, String xmlName) {
    try {
      // creating a Validator instance
      Validator validator = schema.newValidator();

      // setting my own error handler
      validator.setErrorHandler(new MyErrorHandler());

      // preparing the XML file as a SAX source
      SAXSource source = new SAXSource(
        new InputSource(new java.io.FileInputStream(xmlName)));

      // validating the SAX source against the schema
      validator.validate(source);
      System.out.println();
      if (errorCount>0) {
        System.out.println("ERRO: Os seguintes erros foram detectados "+errorCount);
      } else {
        System.out.println("OK.");
      }

    } catch (Exception e) {
      // catching all validation exceptions
      System.out.println();
      System.out.println(e.toString());
    }
  }
  public static Schema loadSchema(String name) {
    Schema schema = null;
    try {
      String language = XMLConstants.W3C_XML_SCHEMA_NS_URI;
      SchemaFactory factory = SchemaFactory.newInstance(language);
      schema = factory.newSchema(new File(name));
    } catch (Exception e) {
      System.out.println(e.toString());
    }
    return schema;
  }
  private static class MyErrorHandler implements ErrorHandler {
    public void warning(SAXParseException e) throws SAXException {
       System.out.println("Avisos: ");
       printException(e);
    }
    public void error(SAXParseException e) throws SAXException {
       System.out.println("ERROS: ");
       printException(e);
    }
    public void fatalError(SAXParseException e) throws SAXException {
       System.out.println("ERRO FATAL: ");
       printException(e);
    }
    private void printException(SAXParseException e) {
      errorCount++;
      System.out.println("    Numero da linha: "+e.getLineNumber());
      System.out.println("   Numero da coluna: "+e.getColumnNumber());
      System.out.println("           Mensagem: "+e.getMessage());
      System.out.println();
    }
  }
}