gmail 邮箱发送邮件 连接超时解决

    //源生发送html 邮件

 @Autowired
    private JavaMailSender mailSender;

    /**
     * 发送html邮件
     *
     * @param to      发送的用户邮箱
     * @param subject 标题
     * @param content 正文
     */
  @Override
    public void sendHtmlMail(String to, String subject, String content) {
            Properties props = new Properties();
            props.put("mail.smtp.auth", auth);
            props.put("mail.smtp.starttls.enable", enable);
            props.put("mail.smtp.host", host);
            props.put("mail.smtp.port", post);

            final String userName = username;
            final String passWord = password;

            Session session = Session.getDefaultInstance(props,
                    new Authenticator() {
                        protected PasswordAuthentication getPasswordAuthentication() {
                            return new PasswordAuthentication(userName, passWord);
                        }
                    });
            MimeMessage message = new MimeMessage(session);
            Transport transport = null;
            try {
                transport = session.getTransport();
                InternetAddress addressFrom = null;
                try {
                    addressFrom = new InternetAddress(username);
                    try {
                        message.setSender(addressFrom);
                        message.setSubject(subject);
                        message.setContent(content, "text/html;charset=gb2312");
                        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
                        transport.connect();
                        Transport.send(message);
                        transport.close();
                    } catch (AddressException e) {
                        e.printStackTrace();
                    }
                } catch (NoSuchProviderException e) {
                    e.printStackTrace();
                }
            } catch (MessagingException e) {
                e.printStackTrace();
            }
        }
}

在用gmail 发送邮件的时候发现 spring-boot 的

<!--邮件包 基础包-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

发送gmail 发送失败 经过判断需要写 源生的邮件发送才不会报587链接超时 下面是application配置文件

      mail:
         host: smtp.gmail.com
         port: 587
         username: [email protected]
         password: epsfpxoeqbbwcyug
         default-encoding: UTF-8
         properties:
           mail:
             smtp:
               auth: true
               starttls:
                 enable: true
                 required: true