JAVA配置群发邮件

以下是JAVA配置群发邮件的示例：

1. 使用JavaMail实现群发邮件

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

public class SendEmail {
    public static void main(String[] args) {
        String host = "smtp.example.com";
        String username = "username";
        String password = "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", "587");

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

        try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("from@example.com"));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("to1@example.com, to2@example.com"));
            message.setSubject("Group Email");
            message.setText("This is a group email.");

            Transport.send(message);

            System.out.println("Group email sent successfully.");

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
}

2. 使用Spring Mail框架实现群发邮件

import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.JavaMailSenderImpl;

public class SendGroupEmail {
    public static void main(String[] args) {
        JavaMailSender mailSender = new JavaMailSenderImpl();
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom("from@example.com");
        message.setTo("to1@example.com", "to2@example.com");
        message.setSubject("Group Email");
        message.setText("This is a group email.");

        mailSender.send(message);
        System.out.println("Group email sent successfully.");
    }
}