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

Z时代
2024-01-10
分类：问答

我有一个基于Spring Boot" title="Spring Boot">Spring Boot（最新的1.1.5.RELEASE）和Thymeleaf的WebApp。

现在，我想添加功能来发送电子邮件并将Thymeleaf用作模板引擎。

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

我得到了完整的（没有XML）Java配置，如下所示：

@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;
    }
}

文件夹和文件树类似于：

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

但这行不通。应用程序正确启动，但是访问页面（在没有此配置的情况下可以运行）会导致异常，例如：

请求处理失败；嵌套的异常是org.thymeleaf.exceptions.TemplateInputException：解决模板“登录”时出错，模板可能不存在，或者任何配置的模板解析器都无法访问该模板，

我尝试将不同的前缀放入webTemplateResolver.setPrefix，但未成功。

我也注意到Thymeleaf的早期版本中报告了错误，导致该错误，但看起来已修复，并且我具有较新的版本。

回答：

主要问题是您配置过多。

Spring

Boot已经配置了TemplateEngine和ThymeleafViewResolver。看到的ThymeleafAutoConfiguration。如果您查看该类，您还将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，并将其添加到中SpringTemplateEngine。

解决方案非常简单，只需删除电子邮件配置和即可删除所有内容emailTemplateResolver。其他一切将由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;
    }
}