如何设置邮件发送超时？

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

public class EmailSender {
    public static void main(String[] args) {
        String host = "smtp.example.com";
        String username = "your_username";
        String password = "your_password";
        String recipient = "recipient@example.com";
        String subject = "Test Email";
        String content = "This is a test email.";

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

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

        try {
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(username));
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
            message.setSubject(subject);
            message.setText(content);

            // 设置连接超时和读取超时，单位为毫秒
            int timeout = 5000;
            Transport transport = session.getTransport("smtp");
            transport.connect(host, username, password);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        } catch (MessagingException e) {
            e.printStackTrace();
            // 处理超时异常
        }
    }
}