SpringBoot集成QQ邮箱发送邮件

<dependency>     
    <groupId>com.sun.mail</groupId>     
    <artifactId>javax.mail</artifactId>     
    <version>1.5.6</version> 
</dependency>

    //表示SMTP发送邮件 必须进行身份验证
    props.put("mail.smtp.auth","true");
    //此处填写SMTP服务器
    props.put("mail.smtp.host","smtp.qq.com");
    //端口号 QQ端口号 587
    props.put("mail.smtp.port","587");
    //此处填写写信人账号
    props.put("mail.user","写信人账号");
    //此处填写16位SMTP口令
    props.put("mail.password","16位SMTP口令");

    //构建授权信息 用于SMTP进行身份验证
    Authenticator authenticator = new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            //用户名密码
            String username = (String) props.get("mail.user");
            String password = (String) props.get("mail.password");
            return new PasswordAuthentication(username,password);
        }
    };
    //使用环境属性和授权信息 创建邮件会话
    Session mailSession = Session.getInstance(props, authenticator);
    //创建邮件消息
    MimeMessage mimeMessage = new MimeMessage(mailSession);
    //设置发件人
    InternetAddress form = null;
    try {
        form = new InternetAddress(props.get("mail.user").toString());
        mimeMessage.setFrom(form);
        
        InternetAddress to  = new InternetAddress(email);
        mimeMessage.setRecipients(Message.RecipientType.TO, String.valueOf(to));

        //设置邮件标题
        mimeMessage.setSubject("标题");

        //设置邮件内容体
        String content = "内容"
        mimeMessage.setContent(content,"text/html;charset=UTF8");

        //发送邮件
        Transport.send(mimeMessage);
        redisTemplate.opsForValue().set(email,code,15L,TimeUnit.MINUTES);

    } catch (MessagingException e) {
        e.printStackTrace();
    }
}