通過Java程序發送郵件（無法將套接字轉換為TLS錯誤）

Question

我從一個隨機站點嘗試了以下代碼以測試從Ubuntu 16.04中的Java發送電子郵件，我已經包含了mail.api，smtp.jar

    package com.javapapers.java;
    import java.util.Properties;
    import javax.mail.Message;
    import javax.mail.MessagingException;
    import javax.mail.Session;
    import javax.mail.Transport;
    import javax.mail.internet.AddressException;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeMessage;

    public class JavaEmail {

    Properties emailProperties;
    Session mailSession;
    MimeMessage emailMessage;

    public static void main(String args[]) throws AddressException,
            MessagingException {

        JavaEmail javaEmail = new JavaEmail();

        javaEmail.setMailServerProperties();
        javaEmail.createEmailMessage();
        javaEmail.sendEmail();
    }

    public void setMailServerProperties() {

        String emailPort = "587";//gmail's smtp port

        emailProperties = System.getProperties();
        emailProperties.put("mail.smtp.port", emailPort);
        emailProperties.put("mail.smtp.auth", "true");
        emailProperties.put("mail.smtp.starttls.enable", "true");

    }

    public void createEmailMessage() throws AddressException,
            MessagingException {
        String[] toEmails = { "joe@javapapers.com" };
        String emailSubject = "Java Email";
        String emailBody = "This is an email sent by JavaMail api.";

        mailSession = Session.getDefaultInstance(emailProperties, null);
        emailMessage = new MimeMessage(mailSession);

        for (int i = 0; i < toEmails.length; i++) {
            emailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(toEmails[i]));
        }

        emailMessage.setSubject(emailSubject);
        emailMessage.setContent(emailBody, "text/html");//for a html email
        //emailMessage.setText(emailBody);// for a text email

    }

    public void sendEmail() throws AddressException, MessagingException {

        String emailHost = "smtp.gmail.com";
        String fromUser = "your emailid here";//just the id alone without @gmail.com
        String fromUserEmailPassword = "your email password here";

        Transport transport = mailSession.getTransport("smtp");

        transport.connect(emailHost, fromUser, fromUserEmailPassword);
        transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
        transport.close();
        System.out.println("Email sent successfully.");
    }

}

我收到以下錯誤（javac顯示無錯誤）

線程“主”中的異常javax.mail.MessagingException：無法將套接字轉換為TLS。

我只是linux的初學者。請提供任何可能有幫助的命令。

Answer 1

請添加並檢查

emailProperties.put("mail.smtp.ssl.trust", "smtp.gmail.com");

更新：

public void setMailServerProperties() {

    String emailPort = "587";//gmail's smtp port

    emailProperties = System.getProperties();
    emailProperties.put("mail.smtp.port", emailPort);
    emailProperties.put("mail.smtp.auth", "true");
    emailProperties.put("mail.smtp.starttls.enable", "true");
    emailProperties.put("mail.smtp.ssl.trust", "smtp.gmail.com"); // add here

}

資源鏈接： JavaMail API –通過Gmail SMTP發送電子郵件示例