使用javax.mail发送给多个收件人

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

public class SendEmail {
    public static void main(String[] args) {
        // 邮件服务器配置
        String host = "smtp.example.com";
        String username = "your_username";
        String password = "your_password";

        // 收件人列表
        List<String> recipients = new ArrayList<>();
        recipients.add("recipient1@example.com");
        recipients.add("recipient2@example.com");
        recipients.add("recipient3@example.com");

        // 邮件内容
        String subject = "Hello";
        String content = "This is a test email.";

        // 创建邮件会话
        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 {
            // 创建邮件消息
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(username));
            for (String recipient : recipients) {
                message.addRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
            }
            message.setSubject(subject);
            message.setText(content);

            // 发送邮件
            Transport.send(message);
            System.out.println("Email sent successfully.");
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }
}