如何在FreeMarkerConfigurer的spring-boot中配置freemarker？

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>

spring.freemarker.template-loader-path=classpath:/templates/
spring.freemarker.suffix=.ftl

spring:
  freemarker:
    template-loader-path: classpath:/templates/
    suffix: .ftl

@Configuration
public class FreemarkerConfig {

    @Autowired
    private Environment environment;

    @Bean
    public FreeMarkerConfigurer freeMarkerConfigurer() {
        FreeMarkerConfigurer configurer = new FreeMarkerConfigurer();
        configurer.setTemplateLoaderPath(environment.getProperty("spring.freemarker.template-loader-path"));
        configurer.setDefaultEncoding("UTF-8");
        Properties settings = new Properties();
        settings.setProperty("auto_import", "/spring.ftl as spring");
        configurer.setFreemarkerSettings(settings);
        return configurer;
    }
}

@Autowired
private FreeMarkerConfigurer freeMarkerConfigurer;

public void renderTemplate() {
    Configuration configuration = freeMarkerConfigurer.getConfiguration();
    // 使用configuration来进行模板渲染等操作
}