spring boot send email html template

1@Bean
2    @Primary
3    public FreeMarkerConfigurationFactoryBean getFreeMarkerConfiguration() throws IOException {
4        FreeMarkerConfigurationFactoryBean bean = new FreeMarkerConfigurationFactoryBean();
5        ClassTemplateLoader ctl = new ClassTemplateLoader(getClass(), "/templates");
6        bean.setPostTemplateLoaders(ctl);
7        return bean;
8    }

1@Bean 
2public FreeMarkerConfigurer freemarkerClassLoaderConfig() {
3    Configuration configuration = new Configuration(Configuration.VERSION_2_3_27);
4    TemplateLoader templateLoader = new ClassTemplateLoader(this.getClass(), "/mail-templates");
5    configuration.setTemplateLoader(templateLoader);
6    FreeMarkerConfigurer freeMarkerConfigurer = new FreeMarkerConfigurer();
7    freeMarkerConfigurer.setConfiguration(configuration);
8    return freeMarkerConfigurer; 
9}