JavaMail 消息传递异常

Question

我编写了一个使用 JavaMail API 发送 gmail 的程序。以下是我的代码:

import java.util.*;
import javax.mail.*;
import javax.activation.*;
import javax.mail.internet.*;
import javax.mail.Session;
import javax.mail.Transport;

class emailSend{
    public static void main(String[] args) {
        String recipient = "receiver@gmail.com";
        String sender = "sender@gmail.com";
        String host = "smtp.gmail.com";
        Properties props = System.getProperties();
        props.put("mail.smtp.host",host);
        props.put("mail.smtp.user", sender);
        props.put("mail.smtp.password", "password");
        props.put("mail.smtp.port", "465"); 
        props.put("mail.smtp.auth", "true");
        Session session = Session.getDefaultInstance(props);

        try
        {
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(sender));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
            message.setSubject("This is the subject");
            message.setText("This the message");
            Transport transport = session.getTransport("smtp");
            transport.connect("smtp.gmail.com",465,"sender01@gmail.com", "password");
            transport.sendMessage(message, message.getAllRecipients());
            System.out.println("Mail successfully sent");
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}

但我收到以下错误:

javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2197)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:740)
at javax.mail.Service.connect(Service.java:366)
at emailSend.main(emailSend.java:29)

我尝试禁用防火墙，但没有用。我应该怎么办？

Answer 1

添加属性:

props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.ssl.checkserveridentity", "true");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.debug", "true");
props.put("mail.smtp.EnableSSL.enable", "true");
props.put("mail.smtp.socketFactory.fallback", "false");