public class PopupAuthenticator extends Authenticator {
    public static final String mailuser = "11111111";//发送方邮箱‘@‘符号前的内容:1111@qq.com
    //	   public static final String mailuser = "mailteam";//发送方邮箱‘@‘符号前的内容:1111@qq.com
    public static final String password = "uadm********bhd";//成功开启IMAP/SMTP服务，在第三方客户端登录时，腾讯提供的密码。注意不是邮箱密码

    public PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(mailuser, password);
    }

}

public class Mail {
    @Test
    public void testMail() {
        String acceptAddressMM = "982977248@qq.com";//接收方邮箱地址的标签
        String labelMM = "我是发送邮件方的标签";
        String acceptlabelMM = "我是接受邮件方的标签";
        String subjectMM = "我是邮件主题";
        String textMM = "我是邮件内容";


        String stateMM = this.sendMail(labelMM, acceptlabelMM, acceptAddressMM, subjectMM, textMM);
        //将发送的信息保存到数据库
        this.saveMailMessage(labelMM, acceptlabelMM, acceptAddressMM, subjectMM, textMM, stateMM);
    }

    /**
     * @param labelMM         发送方邮箱地址的标签
     * @param acceptlabelMM   接收方邮箱地址的标签
     * @param acceptAddressMM 接收方电子邮箱地址
     * @param subjectMM       发送电子邮件的主题
     * @param textMM          发送电子邮件内容
     * @return
     */
    public String sendMail(String labelMM, String acceptlabelMM, String acceptAddressMM, String subjectMM, String textMM) {

        String stateMM = null;
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.qq.com");
//        props.put("mail.smtp.port", "465");//使用465或587端口
        props.put("mail.smtp.port", "587");//使用465或587端口
        props.put("mail.smtp.auth", "true");//设置使用验证
        props.put("mail.smtp.starttls.enable", "true");//使用 STARTTLS安全连接
        try {
            PopupAuthenticator auth = new PopupAuthenticator();
            Session session = Session.getInstance(props, auth);
            session.setDebug(true);//打印Debug信息
            MimeMessage message = new MimeMessage(session);
            Address addressFrom = new InternetAddress(PopupAuthenticator.mailuser + "@qq.com", labelMM);//第一个参数为发送方电子邮箱地址；第二个参数为发送方邮箱地址的标签
            Address addressTo = new InternetAddress(acceptAddressMM, acceptlabelMM);//第一个参数为接收方电子邮箱地址；第二个参数为接收方邮箱地址的标签
            message.setSubject(subjectMM);
//            message.setSubject("发送电子邮件的主题");
//            message.setText("发送电子邮件内容");
            message.setText(textMM);

            message.setFrom(addressFrom);
            message.addRecipient(Message.RecipientType.TO, addressTo);
            message.saveChanges();
            Transport transport = session.getTransport("smtp");
            transport.connect("smtp.qq.com", PopupAuthenticator.mailuser, PopupAuthenticator.password);
            transport.send(message);
            transport.close();
            System.out.println("发送成功");
            stateMM = "发送成功";
        } catch (Exception e) {
            System.out.println(e.toString());
            System.out.println("发送失败");
            stateMM = "发送失败";
        }
        return stateMM;
    }

    /**
     * 邮件发送完成后，将发送的信息保存数据库
     *
     * @param labelMM
     * @param acceptlabelMM
     * @param acceptAddressMM
     * @param subjectMM
     * @param textMM
     * @param stateMM         发送状态
     */
    public void saveMailMessage(String labelMM, String acceptlabelMM, String acceptAddressMM, String subjectMM, String textMM, String stateMM) {
略
    }
}