Spring启动使用Thymeleaf作为模板发送电子邮件 - 配置不起作用

Question

我在基于Spring Boot(最新的1.1.5.RELEASE)和Thymeleaf的WebApp工作.
现在我想添加发送电子邮件的功能,并使用Thymelaf作为模板引擎.

在pom.xml中我添加:

<dependency>
    <groupId>org.springframework.integration</groupId>
    <artifactId>spring-integration-mail</artifactId>
</dependency>

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.7</version>
</dependency>
<dependency>
    <groupId>javax.activation</groupId>
    <artifactId>activation</artifactId>
    <version>1.1.1</version>
</dependency>

遵循本教程:http ://www.thymeleaf.org/doc/articles/springmail.html
得到完整的(没有XML)Java配置:

@Configuration
public ThymeleafReplaceConfigurator {
  @Bean 
   public JavaMailSender getJavaMailSenderImpl(){
        JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();

        Properties props = new Properties();
        /* some properties here */

        javaMailSender.setJavaMailProperties(props);

    return javaMailSender;
    }

    @Bean
    public ClassLoaderTemplateResolver emailTemplateResolver(){
        ClassLoaderTemplateResolver emailTemplateResolver = new ClassLoaderTemplateResolver();
        emailTemplateResolver.setPrefix("/mails/");
        emailTemplateResolver.setSuffix(".html");
        emailTemplateResolver.setTemplateMode("HTML5");
        emailTemplateResolver.setCharacterEncoding("UTF-8");
        emailTemplateResolver.setOrder(1);

        return emailTemplateResolver;
    }

    @Bean
    public ServletContextTemplateResolver defaultWebTemplateResolver(){
        ServletContextTemplateResolver webTemplateResolver = new ServletContextTemplateResolver();
        webTemplateResolver.setPrefix("/templates/");
        webTemplateResolver.setSuffix(".html");
        webTemplateResolver.setTemplateMode("HTML5");
        webTemplateResolver.setCharacterEncoding("UTF-8");
        webTemplateResolver.setOrder(2);

        return webTemplateResolver;
    }

    @Bean
    public SpringTemplateEngine templateEngine(){
    SpringTemplateEngine templateEngine = new SpringTemplateEngine();
    templateEngine.setTemplateResolver(emailTemplateResolver());
    templateEngine.setTemplateResolver(defaultWebTemplateResolver());
    return templateEngine;
    }

    @Bean
    public ThymeleafViewResolver thymeleafViewResolver() {
        ThymeleafViewResolver thymeleafViewResolver = new ThymeleafViewResolver();

        thymeleafViewResolver.setTemplateEngine(templateEngine());
        thymeleafViewResolver.setCharacterEncoding("UTF-8");

        return thymeleafViewResolver;
    }
}

文件夹和文件树如下:

src
  main
    resources
      templates
        login.html
        error.html
      mails
        exampleMail.html

但它不起作用.应用程序正确启动但访问页面(没有此配置工作)会导致异常,例如:

请求处理失败; 嵌套的例外是org.thymeleaf.exceptions.TemplateInputException:错误解决模板"登录",模板可能不存在或可能不通过任何配置的模板解析器访问

我试图把不同的前缀为webTemplateResolver.setPrefix但没有成功.
此外,我注意到在早期版本的Thymeleaf中报告的错误导致了但看起来它已修复,我有更新的版本.

有没有人在这种配置中看到misteake？

Answer 1

主要问题是你配置太多了.

Spring Boot已经配置了一个TemplateEngine以及一个ThymeleafViewResolver.看到了ThymeleafAutoConfiguration.如果您查看该类,您还会注意到它会自动检测ITemplateResolver您的应用程序中可能包含的任何实例,并将其添加到该类中SpringTemplateEngine.

解决方案非常简单,除了电子邮件配置和删除所有内容emailTemplateResolver.其他所有内容都将由Spring Boot处理.

@Configuration
public class ThymeleafEmailConfiguration {
   @Bean 
   public JavaMailSender getJavaMailSenderImpl(){
        JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();

        Properties props = new Properties();
        /* some properties here */

        javaMailSender.setJavaMailProperties(props);

        return javaMailSender;
    }

    @Bean
    public ClassLoaderTemplateResolver emailTemplateResolver(){
        ClassLoaderTemplateResolver emailTemplateResolver = new ClassLoaderTemplateResolver();
        emailTemplateResolver.setPrefix("/mails/");
        emailTemplateResolver.setSuffix(".html");
        emailTemplateResolver.setTemplateMode("HTML5");
        emailTemplateResolver.setCharacterEncoding("UTF-8");
        emailTemplateResolver.setOrder(1);

        return emailTemplateResolver;
    }
}