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 public void sendEmail(String email){
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        //创建Properties类 用于记录邮箱的一些属性
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        Properties props = new Properties();
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        //表示SMTP发送邮件 必须进行身份验证
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        props.put("mail.smtp.auth","true");
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        //此处填写SMTP服务器
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        props.put("mail.smtp.host","smtp.qq.com");
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        //端口号 QQ端口号 587
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        props.put("mail.smtp.port","587");
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        //此处填写写信人账号
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        props.put("mail.user","写信人账号");
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        //此处填写16位SMTP口令
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        props.put("mail.password","16位SMTP口令");
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        //构建授权信息 用于SMTP进行身份验证
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        Authenticator authenticator = new Authenticator() {
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            @Override
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            protected PasswordAuthentication getPasswordAuthentication() {
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                //用户名密码
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                String username = (String) props.get("mail.user");
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                String password = (String) props.get("mail.password");
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                return new PasswordAuthentication(username,password);
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            }
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        };
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        //使用环境属性和授权信息 创建邮件会话
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        Session mailSession = Session.getInstance(props, authenticator);
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        //创建邮件消息
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        MimeMessage mimeMessage = new MimeMessage(mailSession);
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        //设置发件人
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        InternetAddress form = null;
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        try {
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            form = new InternetAddress(props.get("mail.user").toString());
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            mimeMessage.setFrom(form);
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            InternetAddress to  = new InternetAddress(email);
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            mimeMessage.setRecipients(Message.RecipientType.TO, String.valueOf(to));
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            //设置邮件标题
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            mimeMessage.setSubject("标题");
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            //设置邮件内容体
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            String content = "内容"
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            mimeMessage.setContent(content,"text/html;charset=UTF8");
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            //发送邮件
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            Transport.send(mimeMessage);
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            redisTemplate.opsForValue().set(email,code,15L,TimeUnit.MINUTES);
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        } catch (MessagingException e) {
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            e.printStackTrace();
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        }
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    }