javajavax。邮政MessaginException:无法连接到SMTP主机：SMTP。gmail。com，端口：465错误

Question

我正在尝试使用带有gmail用户名的smtp连接发送一封带有attachemetnet的电子邮件。但我无法发送电子邮件，我收到以下错误消息

javax.mail.MessagingException:Could not connect to SMTP host: smtp.gmail.com, port: 465

我还尝试了587和25个端口作为替代。但我也有同样的例外

这是我的密码

  public class GMailSender extends javax.mail.Authenticator {

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

    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.starttls.enable", "true");
        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.getDefaultInstance(props, this);
    }

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

    public synchronized void sendMail(String subject, String body, String sender, String recipients,
                                      String fileName) throws Exception {
        try{
            MimeMessage message = new MimeMessage(session);
            //DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain", fileName));
            message.setSender(new InternetAddress(sender));
            message.setSubject(subject);

            // Create the message part
            BodyPart messageBodyPart = new MimeBodyPart();

            // Fill the message
            messageBodyPart.setText(body);

            // Create a multipar message
            Multipart multipart = new MimeMultipart();

            // Set text message part
            multipart.addBodyPart(messageBodyPart);

            // Part two is attachment
            messageBodyPart = new MimeBodyPart();
            DataSource source = new FileDataSource(fileName);
            messageBodyPart.setDataHandler(new DataHandler(source));
            messageBodyPart.setFileName(fileName);
            multipart.addBodyPart(messageBodyPart);

            // Send the complete message parts
            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();
        }
    }
}

这里是JSSEProvider类

public final class JSSEProvider extends Provider {

    public JSSEProvider() {
        super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");
        AccessController.doPrivileged(new java.security.PrivilegedAction<Void>() {
            public Void run() {
                put("SSLContext.TLS",
                        "org.apache.harmony.xnet.provider.jsse.SSLContextImpl");
                put("Alg.Alias.SSLContext.TLSv1", "TLS");
                put("KeyManagerFactory.X509",
                        "org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl");
                put("TrustManagerFactory.X509",
                        "org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl");
                return null;
            }
        });
    }
}

这是我用来连接smtp服务器的代码

GMailSender sender = new GMailSender("email.username@gmail.com", "password");
                sender.sendMail("Report - " + storeName, supplierPaymentsSummery,
                        "email.username@gmail.com", "srinivas@gmail.com",
                        directory.getAbsolutePath() + "/" + fileName);

请告诉我哪里出了问题