java - 无法发送富文本电子邮件 - Thymeleaf + Spring 4

Question

我正在尝试使用 Thymeleaf + Spring 4 发送富文本电子邮件。我已按照 Thymeleaf 网站上的示例进行操作，但由于某种原因它引发了异常。

这是我的配置:

@Bean
public ServletContextTemplateResolver templateResolver() {
    ServletContextTemplateResolver resolver = new ServletContextTemplateResolver();
    resolver.setPrefix("/WEB-INF/views/");
    resolver.setSuffix(".html");
    resolver.setCharacterEncoding("UTF-8");
    resolver.setTemplateMode("HTML5");
    resolver.setOrder(2);
    return resolver;
}

@Bean
public ClassLoaderTemplateResolver emailTemplateResolver() {
    ClassLoaderTemplateResolver resolver = new ClassLoaderTemplateResolver();
    resolver.setPrefix("/WEB-INF/views/mail/");
    resolver.setSuffix(".html");
    resolver.setTemplateMode("HTML5");
    resolver.setCharacterEncoding("UTF8");
    resolver.setOrder(1);
    return resolver;
}

@Bean
public SpringTemplateEngine templateEngine() {
    final SpringTemplateEngine engine = new SpringTemplateEngine();
    final Set<TemplateResolver> templateResolvers = new HashSet<TemplateResolver>();
    templateResolvers.add(templateResolver());
    templateResolvers.add(emailTemplateResolver());
    engine.setTemplateResolvers(templateResolvers);
    return engine;
}

正如您从上面的配置中看到的，我有两个解析器；一份用于页面，一份用于电子邮件模板。根据我在网上所做的研究，当我尝试使用我拥有的模板启动电子邮件时，它尝试使用 templateResolver() 而不是 emailTemplateResolver()，尽管订单设置正确。

这是我的电子邮件服务:

Autowired
private JavaMailSender mailSender;

@Autowired
private TemplateEngine templateEngine;

private static Logger logger = LoggerFactory.getLogger(EmailService.class);

/*
 * Send HTML mail (simple)
 */
public void sendSimpleMail(final Locale locale)
        throws MessagingException {

    final String recipientName = "Name";
    final String recipientEmail = "Email";

    // Prepare the evaluation context
    final Context ctx = new Context(locale);
    ctx.setVariable("name", recipientName);

    // Prepare message using a Spring helper
    final MimeMessage mimeMessage = this.mailSender.createMimeMessage();
    final MimeMessageHelper message = new MimeMessageHelper(mimeMessage, "UTF-8");
    message.setSubject("Example HTML email (simple)");
    message.setFrom("thymeleaf@example.com");
    message.setTo(recipientEmail);

    // Create the HTML body using Thymeleaf
    final String htmlContent = this.templateEngine.process("email-simple", ctx);
    message.setText(htmlContent, true /* isHtml */);

    // Send email
    this.mailSender.send(mimeMessage);

}

这是抛出的异常:

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Resource resolution by ServletContext with org.thymeleaf.resourceresolver.ServletContextResourceResolver can only be performed when context implements org.thymeleaf.context.IWebContext [current context: org.thymeleaf.context.Context]

有人知道如何解决这个问题吗？

提前致谢

Answer 1

嘿，我在一些研究之前遇到了这个问题，经过一些研究，我找到了解决方法。将您的 Java 配置更改为类似以下内容，您还必须将 html 内容移动到/WEB-INF/classes/mail/ 因为 ClassLoaderTemplateResolver 会在类目录中查找您的文件。

@Bean
public TemplateResolver templateResolver() {
    TemplateResolver resolver = new ServletContextTemplateResolver();
    resolver.setPrefix("/WEB-INF/views/");
    resolver.setSuffix(".html");
    resolver.setCharacterEncoding("UTF-8");
    resolver.setTemplateMode("HTML5");
    resolver.setOrder(2);
    return resolver;
}

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

@Bean
public SpringTemplateEngine templateEngine() {
    final SpringTemplateEngine engine = new SpringTemplateEngine();
    final Set<TemplateResolver> templateResolvers = new HashSet<TemplateResolver>();
    templateResolvers.add(emailTemplateResolver());
    templateResolvers.add(templateResolver());
    engine.setTemplateResolvers(templateResolvers);
    return engine;
}

希望这有帮助!