TemplateEngine 未在模板文件夹中查找文件

Question

我正在构建一个 SpringBoot 应用程序，它从数据库加载国际化消息。 （遵循本教程）

从此，我必须创建一个 ThymeleafConfiguration 类并设置一个 SpringTemplateEngine Bean。本教程仅给出了有关此配置的粗略想法（仅配置了消息源，但没有配置其他模板引擎配置），因此它破坏了我的控制器页面渲染（控制器现在返回字符串而不是视图）。

我正在尝试配置 TemplateEngine 的其余部分（例如 TemplateResolver，我认为这是渲染不正确的原因），但是，我不知道如何正确执行此操作 [我不断收到“模板解析期间发生错误（模板：“ServletContext资源[/templates/login.html]”）“消息]。

如何正确配置SpringTemplateEngine？

到目前为止我的配置：

@Configuration
public class ThymeleafConfiguration implements WebMvcConfigurer, ApplicationContextAware{

    private ApplicationContext applicationContext;

    @Autowired
    private DatabaseMessageSource databaseMessageSource;

    @Bean
      public ViewResolver viewResolver() {
        ThymeleafViewResolver resolver = new ThymeleafViewResolver();
        resolver.setTemplateEngine(thymeleafTemplateEngine());
        resolver.setCharacterEncoding("UTF-8");
        return resolver;
      }

     private ITemplateResolver templateResolver() {
            SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
            resolver.setApplicationContext(applicationContext);
            resolver.setPrefix("/templates/");
            resolver.setSuffix(".html");
            resolver.setTemplateMode(TemplateMode.HTML);
            return resolver;
          }


    @Bean
    public SpringTemplateEngine thymeleafTemplateEngine() {
        SpringTemplateEngine engine = new SpringTemplateEngine();
        engine.setTemplateResolver(templateResolver());
        engine.setTemplateEngineMessageSource(databaseMessageSource);
        return engine;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;

    }

}

控制器类：

 @Controller
    public class ApplicationController {


    @RequestMapping("/home")
    public String home() {
        return "/home.html";
    }


    @RequestMapping("/core/index")
    public String index() {
        return "/core/index.html";
    }

    @RequestMapping("/login")
    public String login() {
        return "login";
    }

Answer 1

问题在于

private ITemplateResolver templateResolver() {
    SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
    resolver.setApplicationContext(applicationContext);
    resolver.setPrefix("/templates/"); // Here!!!
    resolver.setSuffix(".html");
    return resolver;
}

由于模板位于 src/main/resources 中，因此必须指向类路径，如下所示：

@Bean
public SpringResourceTemplateResolver templateResolver() {
    SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
    resolver.setApplicationContext(applicationContext);
    resolver.setPrefix("classpath:/templates/"); // It works after adding 'classpath:'
    resolver.setSuffix(".html");
    return resolver;
}

此外，从接口到实现类有一些变化，但不会影响结果。

Answer 2

另一个例子，以防有人想要工作参考：

@Configuration
public class ThymeleafConfig implements InitializingBean {

public static final String TEMPLATE_LOCATION = "classpath:/thymeleaf/templates/email/";

protected static final Logger logger = CustomLoggerFactory.getLogger();

@Autowired
private ApplicationContext applicationContext;

@Bean
public SpringTemplateEngine emailTemplateEngine() {
    SpringTemplateEngine templateEngine = new SpringTemplateEngine();
    templateEngine.setTemplateResolver(htmlTemplateResolver());
    templateEngine.setTemplateResolver(textTemplateResolver());
    return templateEngine;
}

private SpringResourceTemplateResolver htmlTemplateResolver() {
    SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
    templateResolver.setApplicationContext(applicationContext);
    templateResolver.setOrder(Integer.valueOf(1));
    templateResolver.setPrefix(TEMPLATE_LOCATION);
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode(TemplateMode.HTML);
    templateResolver.setCharacterEncoding(StandardCharsets.UTF_8.toString());
    templateResolver.setCacheable(false);
    templateResolver.setCheckExistence(true);
    return templateResolver;
}

private SpringResourceTemplateResolver textTemplateResolver() {
    SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
    templateResolver.setApplicationContext(applicationContext);
    templateResolver.setOrder(Integer.valueOf(2));
    templateResolver.setPrefix(TEMPLATE_LOCATION);
    templateResolver.setSuffix(".txt");
    templateResolver.setTemplateMode(TemplateMode.TEXT);
    templateResolver.setCharacterEncoding(StandardCharsets.UTF_8.toString());
    templateResolver.setCacheable(false);
    templateResolver.setCheckExistence(true);
    return templateResolver;
}

@Override
public void afterPropertiesSet() throws Exception {
    // this just prints the templates found
    String path = TEMPLATE_LOCATION;
    ClassPathResource resource = new ClassPathResource(path);
    try (InputStream inputStream = resource.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
        logger.info("Found the following templates in " + path);
        String line;
        while ((line = reader.readLine()) != null) {
            logger.info(line);
        }
    } catch (Exception e) {
        logger.error("Caught Exception listing email templates:" + e.toString());
    }
}
}