How to use SpringTemplateEngine when using Spring Boot

Question

I am using Thymeleaf SpringTemplateEngine to create a HTML e-mail on my Spring application. When I was using pure Spring MVC everything was perfect. Now with Spring Boot the

Answer 1

You are using Spring Boot then let Spring Boot do the heavy lifting, which it already does. Remove your constructor and simply @Autowire the JavaMailSender and SpringTemplateEngine.

Add the mail configuration to the application.properties.

spring.mail.host=your-mail-server
spring.mail.port=
spring.mail.username
spring.mail.password

Add the thyme leaf configuration to the application.properties

# THYMELEAF (ThymeleafAutoConfiguration)
spring.thymeleaf.check-template-location=true
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.excluded-view-names= # comma-separated list of view names   that should be excluded from resolution
spring.thymeleaf.view-names= # comma-separated list of view names that can be resolved
spring.thymeleaf.suffix=.html
spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.content-type=text/html # ;charset=<encoding> is added
spring.thymeleaf.cache=true # set to false for hot refresh

If you have done that change your class

@Service
public class MailService {

    @Autowired
    private JavaMailSender mailSender;

    @Autowired
    private SpringTemplateEngine templateEngine;

    @Value("${spring.mail.username}")
    private String username;

    public void enviarRelatorio(String nome, String email, String obra,long medicao, Locale locale) throws MessagingException {

        String subject = "Novo relatório";

        final Context ctx = new Context(locale);
        ctx.setVariable("nome", nome);
        ctx.setVariable("obra", obra);
        ctx.setVariable("data", DataUtils.getInstance().getDataString(medicao));
        ctx.setVariable("logo", "logo.jpg");

        final MimeMessage mimeMessage = this.mailSender.createMimeMessage();
        final MimeMessageHelper message = new MimeMessageHelper(mimeMessage,true, "UTF-8");
        message.setSubject(subject);
        message.setTo(email);

        try {
            message.setFrom(new InternetAddress(username, "Sistema"));
        } catch (UnsupportedEncodingException e) {
        }

        final String htmlContent = this.templateEngine.process( "email-relatorio", ctx);
        message.setText(htmlContent, true);

        try {
            message.addInline("logo.jpg", new FileSystemResource("imgs/logo-pro.jpg"), "image/jpg");
        } catch (IOException e) {
            e.printStackTrace();
        }

        this.mailSender.send(mimeMessage);
    }
}