JavaMail: Help with sending e-mails

[David Houghton]

Hi people, any help here would be great. Just so you know, this is my first venture into the JavaMail API. When i run my class below, a javax.mail.MessagingException is thrown, with the outptu [EOF]

Any ideas on why this is happening would be great. The trans connection to the smtpServer seems to be working fine, it is the sendMessage() method which i s throwing the exception

   

package rasTest;

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;



/**
 *
 * @author Dave
 */
public class SimpleSender
{
   
   /* Instance Variables */
   
   private static String smtpServer = "smtp.mail.yahoo.co.uk";
   private static String to = "[e-mail]";
   private static String from = "[e-mail]";
   private static String subject = "Hello";
   private static String body = "body";
   private static String username = "abc";
   private static String password = "123";
   private static int port = 25;
   
   private static Properties props;
   private static Session session;
   
   
   /**
    * Creates a new instance of SimpleSender 
    */
   public SimpleSender()
   {
   }
   
   public static void main(String[] args)
   {      
      send(true);
   }
   
   public static void send(boolean authentication)
   {
      props = System.getProperties();
      props.put("mail.smtp.host", smtpServer);
      props.put("mail.smtp.auth", authentication);
      props.put("mail.smtp.port", port);
      session = Session.getDefaultInstance(props, null);
      Message msg;
      

      try
      {
         Address[] recipients = {new InternetAddress(to)};
         
         // Create a new message
         msg = new MimeMessage(session);

         msg.setFrom(new InternetAddress(from));
         msg.setRecipients(Message.RecipientType.TO,
               InternetAddress.parse(to, false));
         msg.setSubject(subject);
         msg.setText(body);

         if(authentication)
         {
            Transport trans = session.getTransport("smtp");
            trans.connect(smtpServer, 25, username, password);
            
            // Check to make sure server connection was successful
            
            System.out.println(trans.isConnected());
            
            // Send message
            
            trans.sendMessage(msg, recipients);

            trans.close();
         }
         else
         {
            Transport.send(msg);
         }
      }
      catch(AddressException e)
      {
         System.out.println(e.toString());
      }
      catch(MessagingException e)
      {
         System.out.println(e.toString());
      }

   }
}
 

[Ulf Dittmer]

Inserting a call to " session.setDebug(true) " will cause lots of info about what's happening to be written to standard out; often that includes something that points to the problem.

[David Houghton]

Thanks Ulf, i identified the problem using the session debug. My coding was fine, i was trying to test it with an e-mail address using the worng protocol to connect to the server (i think!) Anyways, i am able to send e-mail via SMTP which is great.

I am however having a problem with retrieiving message from the server. I am able to retreive unread messages, but not read messages. the call to folder.getMessages() only seems to be retrieving unread messages

  public SimpleReceiver()
   {
   }
   
   public void receiver(boolean authentication)
   {
      // Get default System properties and Session
      props = System.getProperties();
      session = Session.getDefaultInstance(props, null);
      session.setDebug(true);
      
      
      try
      {
         // Get Pop3 Mail Store and Connect
         store = session.getStore("pop3");
         store.connect(popServer,username,password);
         // Get Default folder
         folder = store.getDefaultFolder();
         if(folder == null)
         {
            throw new Exception("No Default folder");
         }
         // Get Inbox
         folder = folder.getFolder("INBOX");
         if(folder == null)
         {
            throw new Exception("No POP3 Inbox");
         }         
         // Open the fodler as Read Only         
         folder.open(Folder.READ_ONLY);         
         // Get the mesage wrappers and process them         
         Message[] msgs = folder.getMessages();         
         for (int msgNum = 0; msgNum < msgs.length; msgNum++)
         { System.out.println(msgNum);
            printMessage(msgs[msgNum]);
            //System.out.println(msgs.length);
         }
      }
      catch(NoSuchProviderException e)
      {
         System.out.println(e.toString());  
      }
      catch(MessagingException e)
      {
         System.out.println(e.toString());  
      }
      catch(Exception e)
      {
         System.out.println(e.toString());
      }           
   }
   
   public static void printMessage(Message message)
   {
      try
      {
         // Get the header information
         String from = ((InternetAddress)message.getFrom()[0]).getPersonal();
         if(from == null) 
         {
            from = ((InternetAddress)message.getFrom()[0]).getAddress();
         }
         
         System.out.println("FROM: " + from);
         String subject = message.getSubject();
         System.out.println("SUBJECT: " + subject);
         // -- Get the message part (i.e. the message itself) --
         Part messagePart = message;
         Object content = messagePart.getContent();
         // -- or its first body part if it is a multipart message --
         if (content instanceof Multipart)
         {
            messagePart = ((Multipart)content).getBodyPart(0);
            System.out.println("[ Multipart Message ]");
         }
         // -- Get the content type --
         String contentType = messagePart.getContentType();
         // -- If the content is plain text, we can print it --
         System.out.println("CONTENT:" + contentType);
         if (contentType.startsWith("text/plain") || contentType.startsWith("text/html"))
         {
            InputStream is = messagePart.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            String thisLine = reader.readLine();
            while(thisLine != null)
            {
               System.out.println(thisLine);
               thisLine = reader.readLine();
            }
         }
         System.out.println("-----------------------------");
      }
      catch(MessagingException e)
      {
         System.out.println("me" + e.getCause());
      }
      catch(IOException e)
      {
         System.out.println("I/O" + e.getCause());
      }
   }  

[Paul Clapham]

If you're going to be working with JavaMail, and you don't know much about how e-mail works, I would recommend you have a read through the JavaMail FAQ. The question you have asked is one of the many which is answered there.

[David Houghton]

Thanks Paul ive had a read through the FAQs. Ive found out that my messages are deleted from my server once they have been retrieved, which is why i cannot retrieve unread messages!

I though i had found a way around this using message FLAGS, but ive just read that pop3 doesnt support flags!

Would i be write in saying that the only way to access read e-mails would be to store them on the client machine once read?

Thanks

Dave