Java を使用して CMS システム用の電子メール サブスクリプション モジュールを作成する方法

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>javax.mail-api</artifactId>
        <version>1.6.2</version>
    </dependency>
    <dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
        <version>1.6.2</version>
    </dependency>
</dependencies>

@Configuration
@ConfigurationProperties(prefix = "mail")
public class EmailService {

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

    // Getters and setters

    public void sendEmail(String to, String subject, String content) throws MessagingException {
        Properties props = new Properties();
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", port);
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");

        Session session = Session.getInstance(props, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress(username));
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
        message.setSubject(subject);
        message.setContent(content, "text/html; charset=utf-8");

        Transport.send(message);
    }
}

@RestController
@RequestMapping("/subscribe")
public class SubscriptionController {

    private final EmailService emailService;

    public SubscriptionController(EmailService emailService) {
        this.emailService = emailService;
    }

    @PostMapping
    public ResponseEntity<String> subscribe(@RequestParam String email) {
        try {
            // 保存订阅者的邮箱地址到数据库中
            // ...

            // 发送邮件
            String subject = "订阅成功";
            String content = "您已成功订阅我们网站的最新内容。";
            emailService.sendEmail(email, subject, content);

            return ResponseEntity.ok("订阅成功");
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("订阅失败");
        }
    }
}

mail.host = smtp.example.com
mail.port = 587
mail.username = your_username
mail.password = your_password