1、引入发送邮件依赖

 <dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.7</version>
</dependency>  

2、邮件发送工具类

参数说明：
smtpHost ：邮箱服务器，如 smtp.qq.com
password ：授权码
fromMail ：发件人邮箱
toMail ：收件人邮箱
title ：邮件标题
content ：邮件内容
File Path ：附件路径

 @Component
public class MailPublish {
    private  static   void  send(String smtpHost, String password, String fromMail, String toMail, String title, String content, String filePath) throws  Exception  {
        Properties props = new Properties();
        props. setProperty ("mail.transport.protocol", "SMTP");
        props.setProperty("mail.host", smtpHost);
        props.setProperty("mail.smtp.auth", "true");

        Authenticator auth = new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(fromMail, password);
            }
        };

         Session  session = Session. getInstance (props, auth);
        Message message = new  Mime Message(session);
        message.setFrom(new InternetAddress(fromMail));
        message.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress(toMail));
        message.setSubject(title);

        // 邮件正文
        MimeBodyPart body = new MimeBodyPart();
        body.setContent(content, "text/html; charset =utf-8");

        // 准备附件
         DataSource  source = new FileDataSource(new File(filePath));
        DataHandler handler = new DataHandler(source);

        // 添加附件
        MimeBodyPart attachment = new MimeBodyPart();
        attachment.setDataHandler(handler);
        attachment.setFileName(MimeUtility.encodeText(handler.getName()));

        // 将正文和附件放入multipart 
        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(body);
        multipart.addBodyPart(attachment);

        message.setContent(multipart);
        // 发送邮件
        Transport.send(message);
    }  

如果您有什么好的想法与方法，欢迎在评论区留言，我们一起讨论~