Android-Java通过javax.mail发送邮件失败

Question

MainClass：

 try {
            GMailSender sender = new GMailSender(email, password);
            sender.sendMail("Forget Password",
                    "Hello this is your code 9986",
                    sender,
                    recvicer);
        } catch (Exception e) {
            Log.e("SendMail", e.getMessage(), e);
        }

public class GMailSender extends javax.mail.Authenticator {
    static {
        Security.addProvider(new JSSEProvider());
    }

    final String emailHost = "smtp.gmail.com";
    private final String user;
    private final String password;
    private final Session session;

    public GMailSender(String user, String password) {
        this.user = user;
        this.password = password;
        Properties props = new Properties();
        props.setProperty("mail.smtp.ssl.enable", "true");
        props.setProperty("mail.transport.protocol", "smtp");
        props.put("mail.smtp.user", user);
        props.setProperty("mail.smtp.ssl.trust", emailHost);
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.socketFactory.fallback", "false");
        props.setProperty("mail.smtp.quitwait", "false");
        session = Session.getInstance(props, this);
    }

    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(user, password);
    }

    public synchronized void sendMail(String subject, String body, String sender, String recipients) {
        try {
            MimeMessage message = new MimeMessage(session);
            DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
            message.setSender(new InternetAddress(sender));
            message.setSubject(subject);
            message.setDataHandler(handler);
            if (recipients.indexOf(',') > 0)
                message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
            else
                message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
            Transport transport = session.getTransport("smtp");
            transport.connect(emailHost, user, password);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        } catch (Exception e) {
            Log.e("SendMail", e.getMessage(), e);
        }
    }


    public static class ByteArrayDataSource implements DataSource {
        private final byte[] data;
        private String type;

        public ByteArrayDataSource(byte[] data, String type) {
            super();
            this.data = data;
            this.type = type;
        }

//        public ByteArrayDataSource(byte[] data) {
//            super();
//            this.data = data;
//        }

        public void setType(String type) {
            this.type = type;
        }

        public String getContentType() {
            if (type == null)
                return "application/octet-stream";
            else
                return type;
        }

        public InputStream getInputStream() {
            return new ByteArrayInputStream(data);
        }

        public String getName() {
            return "ByteArrayDataSource";
        }

        public OutputStream getOutputStream() throws IOException {
            throw new IOException("Not Supported");
        }
    }
}

例外情况：

Answer 1

将MainClass代码放置在AsyncTask中。因为GMailSender无法在主线程上工作。

  AsyncTask.execute(() -> {
                try {
                    GMailSender sender = new GMailSender(email, password);
                sender.sendMail("Forget Password",
                        "Hello this is your code 9986",
                        email,
                        recvicer);
                } catch (Exception e) {
                    Log.e("SendMail", e.getMessage(), e);
                }
            });