java发送邮件带附件

好的，以下是Java发送带附件的邮件的示例代码：

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

public class SendEmailWithAttachment {

    public static void main(String[] args) {

        // 收件人邮箱地址
        String to = "recipient@example.com";

        // 发件人邮箱地址
        String from = "sender@example.com";

        // 发件人邮箱密码或授权码
        String password = "your_password_or_auth_code";

        // 邮件主题和正文
        String subject = "Test email with attachment";
        String body = "Please see the attached file.";

        // 创建邮件会话
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.example.com");
        props.put("mail.smtp.auth", "true");
        Session session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(from, password);
                    }
                });

        try {
            // 创建邮件消息
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject(subject);

            // 创建邮件正文
            MimeBodyPart textPart = new MimeBodyPart();
            textPart.setText(body);

            // 创建邮件附件
            MimeBodyPart attachmentPart = new MimeBodyPart();
            attachmentPart.attachFile("path/to/attachment");

            // 将正文和附件添加到邮件消息中
            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(textPart);
            multipart.addBodyPart(attachmentPart);
            message.setContent(multipart);

            // 发送邮件
            Transport.send(message);
            System.out.println("Email sent successfully.");
        } catch (Exception e) {
            System.err.println("Failed to send email: " + e.getMessage());
        }
    }
}

在上面的代码中，需要将以下信息替换为实际的值：

- `to`：收件人邮箱地址
- `from`：发件人邮箱地址
- `password`：发件人邮箱密码或授权码
- `subject`：邮件主题
- `body`：邮件正文
- `props.put("mail.smtp.host", "smtp.example.com")`：SMTP服务器地址

另外，需要将附件的文件路径替换为实际的路径。