MathLearningApp/src/main/java/mathlearning/service/EmailService.java

package mathlearning.service;

import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;

public class EmailService {
    private final String host;
    private final String port;
    private final String username;
    private final String password;
    private final boolean auth;

    public EmailService(String host, String port, String username, String password, boolean auth) {
        this.host = host;
        this.port = port;
        this.username = username;
        this.password = password;
        this.auth = auth;
    }

    public boolean sendVerificationCode(String toEmail, String verificationCode, int flag) {
        try {
            Properties props = new Properties();
            props.put("mail.smtp.host", host);
            props.put("mail.smtp.port", port);
            props.put("mail.smtp.auth", auth);
            props.put("mail.smtp.starttls.enable", "true");

            Session session = Session.getInstance(props, new Authenticator() {
                @Override
                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(toEmail));
            message.setSubject("数学学习软件 - 注册验证码");
            String emailContent="";

            if (flag == 1) emailContent = registerContent(verificationCode);
            else if (flag == 2) emailContent = resetPasswordContent(verificationCode);


            message.setText(emailContent);

            Transport.send(message);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    public String registerContent(String verificationCode) {
        return "尊敬的用户：\n\n" +
                "您的注册验证码是：" + verificationCode + "\n\n" +
                "该验证码有效期为10分钟。\n\n" +
                "如果您没有注册本软件，请忽略此邮件。\n\n" +
                "数学学习软件团队";
    }

    public String resetPasswordContent(String verificationCode) {
        return "尊敬的用户：\n\n" +
                "您的重置验证码是：" + verificationCode + "\n\n" +
                "该验证码有效期为10分钟。\n\n" +
                "如果您没有重置密码，请忽略此邮件。\n\n" +
                "数学学习软件团队";
    }
}