学习常见的Java邮件发送工具类

    javax.mail
    javax.mail-api
    1.6.1


    com.sun.mail
    javax.mail
    1.6.1

String host = "smtp.example.com";
int port = 587;
String protocol = "smtp";
String username = "your_username";
String password = "your_password";

Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", host);
props.put("mail.smtp.port", port);

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

Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("from@example.com"));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("to@example.com"));
message.setSubject("Hello");
message.setText("This is a test email.");

Transport.send(message);

    org.springframework.boot
    spring-boot-starter-mail

spring:
  mail:
    host: smtp.example.com
    port: 587
    username: your_username
    password: your_password
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true

@Component
public class MyMailSender implements MailSender {

    @Autowired
    private JavaMailSender javaMailSender;

    @Override
    public void sendMail(MailMessage mailMessage) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(mailMessage.getFrom());
        message.setTo(mailMessage.getTo());
        message.setSubject(mailMessage.getSubject());
        message.setText(mailMessage.getText());
        javaMailSender.send(message);
    }
}

@Component
public class MyMailClient {

    @Autowired
    private MailSender mailSender;

    public void sendEmail() {
        MailMessage mailMessage = new MailMessage();
        mailMessage.setFrom("from@example.com");
        mailMessage.setTo("to@example.com");
        mailMessage.setSubject("Hello");
        mailMessage.setText("This is a test email.");
        mailSender.sendMail(mailMessage);
    }
}