用 Java 框架扩展无服务器应用程序的功能

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
</dependency>

@ConfigurationProperties("spring.mail")
public class EmailProperties {

    private String host;
    private int port;
    private String username;
    private String password;

    // 省略 getter 和 setter 方法
}

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    public JavaMailSender getJavaMailSender() {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost(emailProperties.getHost());
        mailSender.setPort(emailProperties.getPort());
        mailSender.setUsername(emailProperties.getUsername());
        mailSender.setPassword(emailProperties.getPassword());
        return mailSender;
    }
}

@Service
public class EmailService {

    private JavaMailSender mailSender;

    @Autowired
    public EmailService(JavaMailSender mailSender) {
        this.mailSender = mailSender;
    }

    public void sendWelcomeEmail(String emailAddress) {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message);
        helper.setTo(emailAddress);
        helper.setSubject("Welcome to our App!");
        helper.setText("Thank you for signing up for our app, we're excited to have you!");
        mailSender.send(message);
    }
}