spring boot 和 thymeleaf 仅用于电子邮件

Question

我有一个可以正常工作的 spring boot 应用程序。

我需要添加一个功能，以便在发生某些操作时发送电子邮件。

我添加了 thymeleaf 代码：

@Configuration
public class ThymeleafTemplateConfig {

    @Bean
    public SpringTemplateEngine springTemplateEngine() {
        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.addTemplateResolver(htmlTemplateResolver());
        return templateEngine;
    }

    @Bean
    public FileTemplateResolver htmlTemplateResolver() {
        FileTemplateResolver emailTemplateResolver = new FileTemplateResolver();
        emailTemplateResolver.setPrefix(EMAILS_TEMPLATES_DIRECTORY);
        //emailTemplateResolver.setSuffix(".html");
        emailTemplateResolver.setTemplateMode("HTML");
        emailTemplateResolver.setCharacterEncoding(StandardCharsets.UTF_8.name());
        return emailTemplateResolver;
    }

}

并在处理根 url 的代码下方/

@Controller
public class IndexController {

    @RequestMapping("/")
    public String index() {
        //return "main.xhtml";
        return "operation.xhtml";
    }

}

当我登录到我的网站时，我重定向到“http://mysiteip/”，并且我已将“设置为映射” / " 是 operation.xhtml 因此，在重定向时或者如果我点击“http://mysiteip/”，则会发生错误。

 ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - : - : - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateInputException: Error resolving template "operation.xhtml", template might not exist or might not be accessible by any of the configured Template Resolvers] with root cause
org.thymeleaf.exceptions.TemplateInputException: Error resolving template "operation.xhtml", template might not exist or might not be accessible by any of the configured Template Resolvers

为什么thymeleaf尝试渲染视图？我只想将 thymeleaf 用于电子邮件部分（发送带有 html 正文的电子邮件）。