Configuration configuration = freeMarkerConfigurer.getConfiguration(); 无法获取到模板

可能是因为你没有正确配置 FreeMarker 的模板文件路径。你可以在 FreeMarker 的配置中设置模板文件的路径，示例代码如下：

@Configuration
public class FreeMarkerConfig {

    @Autowired
    private ApplicationContext applicationContext;

    @Bean(name = "freeMarkerConfig")
    public FreeMarkerConfigurer freeMarkerConfigurer() {
        FreeMarkerConfigurer configurer = new FreeMarkerConfigurer();
        configurer.setTemplateLoaderPath("classpath:/templates/");
        Properties settings = new Properties();
        settings.setProperty("defaultEncoding", "UTF-8");
        settings.setProperty("number_format", "0.######");
        settings.setProperty("boolean_format", "true,false");
        settings.setProperty("datetime_format", "yyyy-MM-dd HH:mm:ss");
        configurer.setFreemarkerSettings(settings);
        return configurer;
    }

    @Bean(name = "freeMarkerViewResolver")
    public FreeMarkerViewResolver freeMarkerViewResolver() {
        FreeMarkerViewResolver resolver = new FreeMarkerViewResolver();
        resolver.setOrder(1);
        resolver.setCache(false);
        resolver.setContentType("text/html;charset=UTF-8");
        resolver.setRequestContextAttribute("request");
        resolver.setSuffix(".ftl");
        resolver.setViewClass(FreeMarkerView.class);
        return resolver;
    }

    @Bean
    public FreeMarkerView freeMarkerView() {
        FreeMarkerView view = new FreeMarkerView();
        view.setExposeSpringMacroHelpers(true);
        view.setExposeRequestAttributes(true);
        view.setExposeSessionAttributes(true);
        view.setRequestContextAttribute("request");
        return view;
    }

}

在上面的代码中，`setTemplateLoaderPath()` 方法设置了模板文件的路径为 `classpath:/templates/`，你可以根据实际情况修改为你的模板文件路径。如果你的模板文件是放在 `src/main/resources/templates/` 目录下，那么可以将 `setTemplateLoaderPath()` 方法的参数改为 `"classpath:/templates/"`。