Use java to send QQ mailbox MMS + attachment (send personal website verification code, register account or change password)

principle

Send through SMTP (mail sending request) protocol, POP3 (mail receiving request) protocol receiving

You need to prepare two packages: mali.jar activation.jar
copy the package name and find it here: download



the package guide

Get authorization code:
in QQ mailbox settings-account

Implementation code

public class mailDome {
    
    
    public static void main(String[] args) throws GeneralSecurityException, MessagingException {
    
    
        Properties prop = new Properties();
        prop.setProperty("mail.host","smtp.qq.com");//设置服务器
        prop.setProperty("mail.transport.protocol","smtp");//邮件发送协议
        prop.setProperty("mail.smtp.auth","true");//需要验证用户密码

        //QQ邮箱需要ssl加密
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        prop.put("mail.smtp.ssl.enable","true");  //ssl安全连接
        prop.put("mail.smtp.ssl.socketFactory",sf);

        //1.创建定义整个应该程序所需要的环境信息session对象
        Session session = Session.getDefaultInstance(prop, new Authenticator() {
    
    
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
    
    
                //用户,授权码
                return new PasswordAuthentication("发件人[email protected]", "授权码");//授权码看上面，通过QQ邮箱获取
            }
        });

        //2.通过session获取getTransport,连接和发送
        Transport ts = session.getTransport();

        //3.使用邮箱的的用户名和授权码连上服务器
        ts.connect("smtp.qq.com","发件人[email protected]", "授权码");

        //4.创建邮件
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress("发件人[email protected]"));  //发件人
        message.setRecipient(Message.RecipientType.TO,new InternetAddress("收件人[email protected]"));    //收件人,可以+s指定多个
        message.setSubject("标题");   //标题
        message.setContent("<h1 style='color:red'>你好</h1>","text/html;charset=UTF-8");  //内容

        //5.发送邮件
        ts.sendMessage(message,message.getAllRecipients());//信件,收件的对象(上面设置好的,直接get)
        //关闭流
        ts.close();
    }
}

But general emails are accompanied by pictures or attachments. At this time, we need to encapsulate the email with a layer, and let MimeMultipart as a MimeBodyPart to add to the embedded resource layer. If there are attachments, maybe encapsulate

public static void main(String[] args) throws GeneralSecurityException, MessagingException {
    
    
    Properties prop = new Properties();
    prop.setProperty("mail.host", "smtp.qq.com");//设置服务器
    prop.setProperty("mail.transport.protocol", "smtp");//邮件发送协议
    prop.setProperty("mail.smtp.auth", "true");//需要验证用户密码

    //QQ邮箱需要ssl加密
    MailSSLSocketFactory sf = new MailSSLSocketFactory();
    sf.setTrustAllHosts(true);
    prop.put("mail.smtp.ssl.enable", "true");  //ssl安全连接
    prop.put("mail.smtp.ssl.socketFactory", sf);

    //1.创建定义整个应该程序所需要的环境信息session对象(QQ邮箱需要)
    Session session = Session.getDefaultInstance(prop, new Authenticator() {
    
    
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
    
    
            //用户,授权码
            return new PasswordAuthentication("发件人[email protected]", "授权码");
        }
    });

    //2.通过session获取getTransport,连接和发送
    Transport ts = session.getTransport();

    //3.使用邮箱的的用户名和授权码连上服务器
    ts.connect("smtp.qq.com", "发件人[email protected]", "授权码");

    //4.创建邮件
    MimeMessage message = new MimeMessage(session);
    message.setFrom(new InternetAddress("发件人[email protected]"));  //发件人
    message.setRecipient(Message.RecipientType.TO, new InternetAddress("收件人[email protected]"));    //收件人,可以+s指定多个
    message.setSubject("标题");   //标题
    //---------准备内容---------------------------------------
    //准备内嵌资源
    MimeBodyPart image = new MimeBodyPart();
    DataHandler dh = new DataHandler(new FileDataSource("D:\\note\\JAVA\\web\\发送邮件.png"));//文件需要DataHandler处理数据
    image.setDataHandler(dh);
    image.setContentID("1.png");//设置内容id

    //准备文本,其实信件也只是发一堆标签过去,但内嵌资源需要提前准备
    MimeBodyPart text = new MimeBodyPart();
    text.setContent("带图片和附件的邮件<img src='cid:1.png'>bay~","text/html;charset=UTF-8");

    //文本和内嵌资源封装
    MimeMultipart mm = new MimeMultipart();
    mm.addBodyPart(text);//文本
    mm.addBodyPart(image);//图片
    mm.setSubType("related"); //设置邮件类型   文本:alternative   内嵌资源(图片):related   附件:mixed
	//-----要是只发图片,可以直接把mm当作信件发出去了
    //封装内嵌资源层
    MimeBodyPart contentText = new MimeBodyPart();
    contentText.setContent(mm);
		
    //准备附件
    MimeBodyPart file = new MimeBodyPart();
    DataHandler fdh = new DataHandler(new FileDataSource("D:\\note\\JAVA\\web\\javaweb.md"));
    file.setDataHandler(fdh);
    file.setFileName("web.md");//不设置文件名后缀,默认是后缀是bin

    //封装附件
    MimeMultipart fmm = new MimeMultipart();
    fmm.addBodyPart(file);
    fmm.addBodyPart(contentText);
    mm.setSubType("mixed"); //设置邮件类型   文本:alternative   内嵌资源(图片):related   附件:mixed

    //-------------------------------------------------------
    message.setContent(fmm); 

    //5.发送邮件
    ts.sendMessage(message, message.getAllRecipients());//信件,收件的对象(上面设置好的)
	//关闭流
    ts.close();
}

If your code is correct, the server may treat your email as spam, which can be found in the trash bin

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Thank you for the video tutorial of B Station Kuangshen teacher: video link