public Map act(Redirector redirector,
    SourceResolver resolver,
    Map objectModel,
    String src,
    Parameters par) throws Exception 
{
        Request request = ObjectModelHelper.getRequest(objectModel);
        if (request != null) {
            String form_encoding = par.getParameter("form-encoding", global_form_encoding);
            if (form_encoding != null) {
                request.setCharacterEncoding(form_encoding);
            }
        }
        return null;
}

Set character encoding of current request.

 public  void parameterize(Parameters parameters) throws ParameterException 
{
       
        // super.parameterize(parameters);
        global_form_encoding = parameters.getParameter("form-encoding", null);
}