Java 我无法从选项卡自动发送电子邮件。但是，同样的代码适用于移动设备。。但不适合tab

我不知道，我无法从tab发送邮件。它给出了一个例外，说cud无法通信，网络无法访问。 Gmailsender.java

public class GMailSender extends javax.mail.Authenticator {
private String mailhost = "smtp.gmail.com";
private String user;
private String password;
private Session session;
private Multipart _multipart = new MimeMultipart();
static {
    Security.addProvider(new JSSEProvider());
}
public GMailSender(String user, String password) {
    this.user = user;
    this.password = password;
    Properties props = new Properties();
    props.setProperty("mail.transport.protocol", "smtp");
    props.setProperty("mail.host", mailhost);
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.port", "465");
    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");
    props.setProperty("mail.smtp.ssl.enable", "true");

    session = Session.getDefaultInstance(props, this);

}
protected PasswordAuthentication getPasswordAuthentication() {

    return new PasswordAuthentication(user, password);

}
public synchronized void sendMail(String subject, String body,
                                  String sender, String recipients) throws Exception {
    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);
        BodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setText(body);
        _multipart.addBodyPart(messageBodyPart);
        // Put parts in message
        message.setContent(_multipart);
        if (recipients.indexOf(',') > 0)
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(recipients));
        else
            message.setRecipient(Message.RecipientType.TO,
                    new InternetAddress(recipients));
        Transport.send(message);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

 public class ByteArrayDataSource implements DataSource {
    private 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() throws IOException {
        return new ByteArrayInputStream(data);

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

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

我从下面的活动中调用了这个

GMailSender gMailSender=new GMailSender("user@abc.com","passwd");
gMailSender.sendMail(subject,message,"user@abc.com","to@abc.com");

---

任何建议都会很有帮助。

java.net.ConnectException:90000ms后未能连接到smtp.gmail.com/2404:6800:4003:c00:：6d（端口587）：未连接失败：在com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:1391）上的com.sun.mail.SMTPTransport.protocolConnect上无法访问网络（SMTPTransport.java:412）在javax.mail.Service.connect（Service.java:310）在javax.mail.Service.connect（Service.java:169）在javax.mail.Service.connect（Service.java:118）在javax.mail.Transport.send（Transport.java:118）在com.example.dell.notificationtest.GMailSender.sendMail（GMailSender.java:88）上com.example.dell.notificationtest.MainActivity$sendmail.doInBackground（MainActivity.java:160）com.example.dell.notificationtest.MainActivity$sendmail.doInBackground（MainActivity.java:145）android.os.AsyncTask$2.call（AsyncTask.java:288）java.util.concurrent.FutureTask.run（FutureTask.java:237）在android.os.AsyncTask$SerialExecutor$1.run（AsyncTask.java:231）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112）在java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.java:818原因：java.net.ConnectException:在90000ms后未能连接到smtp.gmail.com/2404:6800:4003:c00:：6d（端口587）：未连接失败：在libcore.io.IoBridge.connecterNo（IoBridge.java:186）的libcore.io.IoBridge.isConnected（IoBridge.java:262）处未连接（IoBridge.java:186）你试过只使用IPv4吗？如何找到它是IPv4还是ipv6？。我刚刚使用了java mail api中的代码…只有我调用了发送方法传递我的用户id和pwd主题等。。。