java写一个发送接口

可以使用JavaMail API来写一个发送接口，以下是一个示例代码：

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

public class EmailSender {
    public void sendEmail(String toAddress, String subject, String text) {
        final String username = "youremail@gmail.com";
        final String password = "yourpassword"; // Note: This is your Gmail password, not your CSDN password.
        String host = "smtp.gmail.com";
        int port = 587;

        // Set email properties
        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);

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

        try {
            // Create message
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(username));
            message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(toAddress));
            message.setSubject(subject);
            message.setText(text);

            // Send message
            Transport.send(message);

            System.out.println("Email sent successfully!");

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

调用 sendEmail 方法，像这样：

EmailSender sender = new EmailSender();
sender.sendEmail("recipient@example.com", "Test Subject", "This is a test email from Java.");

该代码将使用 Gmail SMTP 服务器与收件人收取邮箱连接并发送电子邮件。请确保使用正确的邮箱地址和密码。