Java 发邮件：带附件且正文 html 格式

2023-11-17 20:46:22

在 Java 中发送电子邮件，我们需要使用 JavaMail API。JavaMail API 是一个 Java 库，它提供了一个统一的 API 来发送电子邮件。它支持多种电子邮件协议，包括 SMTP、POP3 和 IMAP。

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

public class SendEmailWithAttachment {

    public static void main(String[] args) {
        // 设置邮件服务器的属性
        Properties properties = new Properties();
        properties.put("mail.smtp.host", "smtp.gmail.com");
        properties.put("mail.smtp.port", "587");
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");

        // 创建一个新的邮件会话
        Session session = Session.getDefaultInstance(properties, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("username", "password");
            }
        });

        // 创建一封新的邮件
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("sender@gmail.com"));
        message.addRecipient(Message.RecipientType.TO, new InternetAddress("recipient@gmail.com"));
        message.setSubject("This is a test email with attachment");

        // 设置邮件正文
        String htmlContent = "<h1>This is the HTML content of the email</h1>";
        MimeBodyPart htmlPart = new MimeBodyPart();
        htmlPart.setContent(htmlContent, "text/html");

        // 设置附件
        MimeBodyPart attachmentPart = new MimeBodyPart();
        File file = new File("attachment.txt");
        attachmentPart.attachFile(file);

        // 将正文和附件组合成一个邮件
        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(htmlPart);
        multipart.addBodyPart(attachmentPart);
        message.setContent(multipart);

        // 发送邮件
        Transport.send(message);

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