ssl - Javamail 不适用于 gmail SMTP

Question

尝试使用 javamail 从我的 java 代码发送电子邮件时出现异常。我正在尝试使用 gmail SMTP(SSL，端口 465)。 TLS 工作(端口 587)。

这是我正在做的。

mailServerProperties = System.getProperties();    
mailServerProperties.put("mail.smtp.port", "465");
mailServerProperties.put("mail.smtp.auth", "true");

mailServerProperties.put("mail.smtp.socketFactory.port", "465");
mailServerProperties.put("mail.smtp.socketFactory.class",
                        "javax.net.ssl.SSLSocketFactory");


getMailSession = Session.getDefaultInstance(mailServerProperties, null);
generateMailMessage = new MimeMessage(getMailSession);
generateMailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(ei.getToaddr()));
generateMailMessage.setFrom(new InternetAddress(ei.getUser()));
generateMailMessage.setSubject(ei.getSubject());
generateMailMessage.setText(ei.getMessage());

transport = getMailSession.getTransport("smtp");
transport.connect("smtp.gmail.com", "user", "password");

获取此异常...

2017-10-01 06:53:51.094 UTC SEVERE: 2542: EnhancedEmailer.generateAndSendEmail: Exception sending email
Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1
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:2042)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:697)

是否有任何属性看起来不对？

Answer 1

按照以下步骤操作:

1. 在您的电子邮件中禁用“双因素身份验证”
2. 导航至:“https://myaccount.google.com/lesssecureapps?pli=1”并开启“访问安全性较低的应用程序”
3. 下载 JavaMail API“https://www.oracle.com/technetwork/java/javamail/index-138643.html”并将其添加到您的库

代码

import java.util.Properties;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class email_try {


    public static void main(String ap[]) {



      String myEmail = "YOUR EMAIL";
      String password = "YOUR PASSWORD";
      String opponentEmail = "THEIR EMAIL";
      Properties pro = new Properties();
      pro.put("mail.smtp.host", "smtp.gmail.com");
      pro.put("mail.smtp.starttls.enable", "true");
      pro.put("mail.smtp.auth", "true");
      pro.put("mail.smtp.port", "587");
      Session ss = Session.getInstance(pro, new javax.mail.Authenticator() {
       @Override
       protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(myEmail, password);
       }
      });



    try {
       Message msg = new MimeMessage(ss);
       msg.setFrom(new InternetAddress(myEmail));
       msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(opponentEmail));
       msg.setSubject("Your Wish");
       msg.setText("java email app");
       Transport trans = ss.getTransport("smtp");
       Transport.send(msg);
       System.out.println("message sent");
      } catch (Exception e) {
       System.out.println(e.getMessage());
      }

 }
}

//尝试此代码并输入正确的电子邮件 ID 和密码