public static synchronized  void applyTransformation(InputStream srcIs,
    OutputStream destOs,
    InputStream templateIs,
    Properties outputProps) throws TransformerException, IOException 
{
   // Public static methods ---------------------------------------------
      StreamSource source = new StreamSource(srcIs);
      StreamResult result = new StreamResult(destOs);
      StreamSource template = new StreamSource(templateIs);
      /*
        Pre-compile the stylesheet. This Templates object may be used
        concurrently across multiple threads. Creating a Templates object
        allows the TransformerFactory to do detailed performance optimization
        of transformation instructions, without penalizing runtime
        transformation.
      */
      Templates templates = transformerFactory.newTemplates( template );
      Transformer transformer = templates.newTransformer();
      if( outputProps != null )
      {
         transformer.setOutputProperties( outputProps );
      }
      transformer.transform( source, result );
}

Applies transformation. Pre-compiled stylesheet should be used in a thread-safe manner grabbing a new transformer before completing the transformation.

 public static synchronized  void applyTransformation(InputStream srcIs,
    OutputStream destOs,
    InputStream templateIs,
    Properties outputProps,
    Properties xslParams) throws TransformerException, IOException 
{
      StreamSource source = new StreamSource( srcIs );
      StreamResult result = new StreamResult( destOs );
      StreamSource template = new StreamSource( templateIs );
      Templates templates = transformerFactory.newTemplates( template );
      // set output properties
      Transformer transformer = templates.newTransformer();
      if(outputProps != null)
      {
         transformer.setOutputProperties(outputProps);
      }
      // set xsl parameters
      if(xslParams != null)
      {
         // note, xslParams.keys() will not work properly,
         // because it will not return the keys for default properties.
         Enumeration keys = xslParams.propertyNames();
         while( keys.hasMoreElements() )
         {
            String key = (String)keys.nextElement();
            transformer.setParameter(key, xslParams.getProperty(key));
         }
      }
      transformer.transform( source, result );
}

Applies template templateIs to xml source srcIs with output properties outputProps and parameters xslParams. The resulting xml is written to destOs