Spring中对Freemarker的手工调用

protected byte[] processByOtherView(Map<String, Object> model, NativeWebRequest webRequest) throws Exception {
        FreeMarkerViewResolver resolver = getApplicationContext().getBean(FreeMarkerViewResolver.class);
        FreeMarkerConfigurer configure = getApplicationContext().getBean(FreeMarkerConfigurer.class);
        FreeMarkerView view = (FreeMarkerView) resolver.resolveViewName(viewName, getLocale());
        Template tpl = configure.getConfiguration().getTemplate(view.getUrl());
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        OutputStreamWriter writer = new OutputStreamWriter(baos);
        tpl.process(model, writer);
        writer.flush();
        return baos.toByteArray();
}