java周期发送邮件代码

好的，以下是Java周期发送邮件的代码实现：

import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Timer;
import java.util.TimerTask;

public class EmailSender {
    
    public static void main(String[] args) {
        Timer timer = new Timer();
        timer.schedule(new EmailTask(), 0, 24 * 60 * 60 * 1000); //周期为1天，单位为ms，可根据需求调整
    }
    
    static class EmailTask extends TimerTask {
        public void run() {
            
            String fromEmail = "your_email_address";
            String password = "your_email_password";
            String toEmail = "recipient_email_address";
            String subject = "Test Email";
            String messageContent = "This is a test email.";
            
            Properties properties = new Properties();
            properties.put("mail.smtp.auth", "true");
            properties.put("mail.smtp.starttls.enable", "true");
            properties.put("mail.smtp.host", "smtp.gmail.com");
            properties.put("mail.smtp.port", "587");
            
            Session session = Session.getInstance(properties,
              new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(fromEmail, password);
                }
              });
            
            try {
                Message message = new MimeMessage(session);
                message.setFrom(new InternetAddress(fromEmail));
                message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(toEmail));
                message.setSubject(subject);
                message.setText(messageContent);
                
                Transport.send(message);
                
            } catch (MessagingException e) {
                throw new RuntimeException(e);
            }
            
            System.out.println("Email sent successfully.");
        }
    }
}

希望能帮到你！现在轮到你来问问题了，请问有什么需要帮助的吗？