code: private void renderBlock(HttpServletResponse res, String templateName,
  			Map<String, String> properties) throws IOException {
  		InputStream is = null;
  		ByteArrayOutputStream baos = new ByteArrayOutputStream();
  		String template = null;
  		try {
  			is = getClass().getClassLoader().getResourceAsStream(templateName);
  			if (is != null) {
  				IOUtils.copy(is, baos);
  				template = baos.toString();
  			} else {
  				throw new IOException("Unable to load template " + templateName);
  			}
  		} finally {
  			IOUtils.closeQuietly(is);
  			IOUtils.closeQuietly(baos);
  		}
  		StrSubstitutor sub = new StrSubstitutor(properties);
  		res.getWriter().write(sub.replace(template));
  	}
docs: Loads the template with the specified name from the classloader and uses
  it to templatize the properties using Apache Commons Lang's
  StrSubstitutor and writes it to the response.
  
  @param res
  the response to write to
  @param template
  the template file to load from the classpath
  @param properties
  the properties to templatize
  @throws IOException