public void init( ExtendedProperties configuration)
    {
        rsvc.info("FileResourceLoader : initialization starting.");
       
        paths = configuration.getVector("path");
       
        /*
         *  lets tell people what paths we will be using
         */

        int sz = paths.size();

        for( int i=0; i < sz; i++)
        {
            rsvc.info("FileResourceLoader : adding path '" + (String) paths.get(i) + "'");
        }

        rsvc.info("FileResourceLoader : initialization complete.");
    }

    /**
     * Get an InputStream so that the Runtime can build a
     * template with it.
     *
     * @param name name of template to get
     * @return InputStream containing the template
     * @throws ResourceNotFoundException if template not found
     *         in the file template path.
     */
    public synchronized InputStream getResourceStream(String templateName)
        throws ResourceNotFoundException
    {
        /*
         * Make sure we have a valid templateName.
         */
        if (templateName == null || templateName.length() == 0)
        {
            /*
             * If we don't get a properly formed templateName then
             * there's not much we can do. So we'll forget about
             * trying to search any more paths for the template.
             */
            throw new ResourceNotFoundException(
                "Need to specify a file name or file path!");
        }

        String template = StringUtils.normalizePath(templateName);
        if ( template == null || template.length() == 0 )
        {
            String msg = "File resource error : argument " + template +
                " contains .. and may be trying to access " +
                "content outside of template root.  Rejected.";

            rsvc.error( "FileResourceLoader : " + msg );
     
            throw new ResourceNotFoundException ( msg );
        }

        /*
         *  if a / leads off, then just nip that :)
         */
        if (template.startsWith("/"))
        {
            template = template.substring(1);
        }

        int size = paths.size();
        for (int i = 0; i < size; i++)
        {
            String path = (String) paths.get(i);
            InputStream inputStream = findTemplate(path, template);
           
            if (inputStream != null)
            {
                /*
                 * Store the path that this template came
                 * from so that we can check its modification
                 * time.
                 */

                templatePaths.put(templateName, path);
                return inputStream;
            }               
        }
   
        /*
         * We have now searched all the paths for
         * templates and we didn't find anything so
         * throw an exception.
         */
         String msg = "FileResourceLoader Error: cannot find resource " +
          template;
   
         throw new ResourceNotFoundException( msg );
    }

可见你一定要设置

// / 设置velocity的模板路径（必要）
  Velocity.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, mainPath + File.separator + "template";