Sende mail via Gmail

Du kunne proeve med:

        SSLContext sslctx = SSLContext.getInstance("SSL");
        sslctx.init(null, new X509TrustManager[] { new MyTrustManager() }, null);
HttpsURLConnection.setDefaultSSLSocketFactory(sslctx.getSocketFactory());

hvor:

class MyTrustManager implements X509TrustManager
{
    public void checkClientTrusted(X509Certificate[] chain, String authType) {
    }
    public void checkServerTrusted(X509Certificate[] chain, String authType) {
    }
    public X509Certificate[] getAcceptedIssuers() {
        return new X509Certificate[0];
    }
}

Du faar saa ikke checket certfifikat .................

Hej, tak for respons. Desværre får jeg fortsat samme fejl. Min kode ser nu således ud (jeg er lidt usikker på, hvor jeg skal forsøge at tilføje den kode, du har foreslået).

import java.security.cert.X509Certificate;
import java.util.Properties;
import javax.mail.Authenticator;
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;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.X509TrustManager;

public class GmailSender {

    private static String HOST = "smtp.gmail.com";
    private static String USER = "my_account@gmail.com";
    private static String PASSWORD = "my_password";
    private static String PORT = "587";
    private static String FROM = "my_account@gmail.com";
    private static String TO = "recipient@mydomain.com";

    private static String STARTTLS = "true";
    private static String AUTH = "true";
    private static String DEBUG = "true";
    private static String SUBJECT = "Testing mail through gmail";
    private static String TEXT = "Mail body";

    public static synchronized void send() {
        //Use Properties object to set environment properties
        Properties props = System.getProperties();

        props.put("mail.smtp.starttls.enable", STARTTLS);
        props.put("mail.smtp.host", HOST);
        props.put("mail.smtp.user", USER);
        props.put("mail.smtp.password", PASSWORD);
        props.put("mail.smtp.port", PORT);
        props.put("mail.smtp.auth", AUTH);
        props.put("mail.smtp.debug", DEBUG);

        try {
            Authenticator auth = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(USER, PASSWORD);
                }
            };
         
            Session session = Session.getDefaultInstance(props, auth);

            MimeMessage message = new MimeMessage(session);
            message.setText(TEXT);
            message.setSubject(SUBJECT);
            message.setFrom(new InternetAddress(FROM));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(TO));

      X509TrustManager x509 = new X509TrustManager() {
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType) {
        }
       
        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType) {
        }
       
        @Override
        public X509Certificate[] getAcceptedIssuers() {
          return new X509Certificate[0];
        }
      };

      SSLContext sslctx = SSLContext.getInstance("SSL");
      sslctx.init(null, new X509TrustManager[] { x509 }, null);
      HttpsURLConnection.setDefaultSSLSocketFactory(sslctx.getSocketFactory());

      Transport transport = session.getTransport("smtp");
      transport.connect();
      transport.sendMessage(message, message.getAllRecipients());
      transport.close();

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    GmailSender.send();
    System.out.println("Mail sent successfully!");
  }
}

Så spiller det endelig! Jeg fandt løsningen på https://forums.oracle.com/forums/thread.jspa?threadID=2042465.

Tricket er ganske enkelt at sætte følgende property:
props.put("mail.smtp.ssl.trust", HOST);

Den komplette kode ser således ud:

import java.util.Properties;
import javax.mail.Authenticator;
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 GmailSender {
    private static String HOST = "smtp.gmail.com";
    private static String USER = "my_account@gmail.com";
    private static String PASSWORD = "my_password";
    private static String PORT = "587";
    private static String FROM = "my_account@gmail.com";
    private static String TO = "recipient@mydomain.com";

    private static String STARTTLS = "true";
    private static String AUTH = "true";
    private static String DEBUG = "true";
    private static String SUBJECT = "Testing mail through gmail";
    private static String TEXT = "Mail body";

    public static synchronized void send() {
        //Use Properties object to set environment properties
        Properties props = System.getProperties();

        props.put("mail.smtp.starttls.enable", STARTTLS);
        props.put("mail.smtp.host", HOST);
        props.put("mail.smtp.user", USER);
        props.put("mail.smtp.password", PASSWORD);
        props.put("mail.smtp.port", PORT);
        props.put("mail.smtp.auth", AUTH);
        props.put("mail.smtp.debug", DEBUG);
        props.put("mail.smtp.ssl.trust", HOST);

        try {
            Authenticator auth = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(USER, PASSWORD);
                }
            };
         
            Session session = Session.getDefaultInstance(props, auth);

            MimeMessage message = new MimeMessage(session);
            message.setText(TEXT);
            message.setSubject(SUBJECT);
            message.setFrom(new InternetAddress(FROM));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(TO));

            Transport transport = session.getTransport("smtp");
            transport.connect();
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
      GmailSender.send();
      System.out.println("Mail sent successfully!");
    }
}