Java method call

Question

Java method call

I am using this code to send emails to mailboxes.

private String sendFromGMail(String from, String pass, String[] to, String subject, String body)
    {
        Properties props = System.getProperties();
        String host = "smtp.gmail.com";
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.user", from);
        props.put("mail.smtp.password", pass);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");

        Session session = Session.getDefaultInstance(props);
        MimeMessage message = new MimeMessage(session);

        try
        {
            message.setFrom(new InternetAddress(from));
            InternetAddress[] toAddress = new InternetAddress[to.length];

            // To get the array of addresses
            for (int i = 0; i < to.length; i++)
            {
                toAddress[i] = new InternetAddress(to[i]);
            }

            for (int i = 0; i < toAddress.length; i++)
            {
                message.addRecipient(Message.RecipientType.TO, toAddress[i]);
            }

            message.setSubject(subject);
            message.setText(body);
            Transport transport = session.getTransport("smtp");
            transport.connect(host, from, pass);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        }
        catch (AddressException ae)
        {
            ae.printStackTrace();
        }
        catch (MessagingException me)
        {
            me.printStackTrace();
        }

     return "message is send";
    }

I am wondering how I can insert some validation - this email was sent successfully. For example, is there a way to check if there is any exception? If there is no exception to return "Mail sent".

+3

java

Peter Penzov 08 june '15 at 18:00

source to share

4 answers

ACV · Answer 1 · 2015-06-08T18:08:51+0000

Take a look here: Java Mail API . Basically you can do 2 things:

Implement and register TransportListener
Catch these exceptions:

SendFailedException - if the send failed due to invalid addresses. MessagingException - if connection is dead or not in connected state

For example:

TransportListener listener = new MyTransportAdapter();
transport.addTransportListener(listener);

Where:

class MyTransportAdapter extends TransportAdapter {
//Implement only methods of interest from TransportAdapter API
}

cybersoft · Answer 2 · 2015-06-08T18:08:26+0000

You can add these returns, for example:

...
catch (AddressException ae)
{
    ae.printStackTrace();
    return "Mail is not sent for some reason 1";
}
catch (MessagingException me)
{
    me.printStackTrace();
    return "Mail is not sent for some reason 2";
}

user813853 · Answer 3 · 2015-06-08T18:09:58+0000

Just add a block boolean

and finally

for example:

try{
   .... 
   boolean isExceptionThrown = false ;
}
catch (AddressException ae){
   ae.printStackTrace();
   isExceptionThrown = true ;
}
catch (MessagingException me)
{
   me.printStackTrace();
   isExceptionThrown = true ;
}
finally{
   if (isExceptionThrown == false) return "mail OK sent" ;
}

Nyamiou the galeanthrope · Answer 4 · 2015-06-08T18:13:27+0000

If you don't have an exception, it means that the SMTP server has decided to deliver your message and will try to deliver it. But the address may not even exist, and the only way to know what to wait and see if you receive "delivery status notifications" is by letting you know, but some server won't even send you those messages.

Basically, if you want a reliable way to send a message, don't use emails.

Java method call

More articles: