code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the  "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * $Id$
   */
  package servlet;
  
  import javax.servlet.*;
  import javax.servlet.http.*;
  import java.io.*;
  import java.net.URL;
  
  import javax.xml.transform.TransformerFactory;
  import javax.xml.transform.Transformer;
  import javax.xml.transform.Source;
  import javax.xml.transform.stream.StreamSource;
  import javax.xml.transform.stream.StreamResult;
  
  /*
   * This sample applies the todo.xsl stylesheet to the
   * todo.xml XML document, and returns the transformation
   * output (HTML) to the client browser.
   *
   * IMPORTANT: For this to work, you must place todo.xsl and todo.xml 
   * in the servlet root directory for documents.
   *
   */
  
  public class SimpleXSLTServlet extends HttpServlet {
  
    /**
     * String representing the file separator characters for the System.
     */
    public final static String FS = System.getProperty("file.separator");
    
    public void init(ServletConfig config) throws ServletException
    {
      super.init(config);
    }
  
    public void doGet (HttpServletRequest request,
                       HttpServletResponse response)
      throws ServletException, IOException, java.net.MalformedURLException
    {
      // The servlet returns HTML.
      response.setContentType("text/html; charset=UTF-8");    
      // Output goes in the response stream.
      PrintWriter out = response.getWriter();
      try
      {	
        TransformerFactory tFactory = TransformerFactory.newInstance();
        //get the real path for xml and xsl files.
        String ctx = getServletContext().getRealPath("") + FS;
        // Get the XML input document and the stylesheet.
        Source xmlSource = new StreamSource(new URL("file", "", ctx+"birds.xml").openStream());
        Source xslSource = new StreamSource(new URL("file", "", ctx+"birds.xsl").openStream());
        // Generate the transformer.
        Transformer transformer = tFactory.newTransformer(xslSource);
        // Perform the transformation, sending the output to the response.
        transformer.transform(xmlSource, new StreamResult(out));
      }
      catch (Exception e)
      {
        out.write(e.getMessage());
        e.printStackTrace(out);    
      }
      out.close();
    }
    
  }
  