Re: java mail and thread
On 24/10/13 22:28, andros976@gmail.com wrote:
Good evening to all .
I'm designing an application that has the task of sending the email automatically taking the recipients from a db.
To send email I created a special class that receives the string with the recipient's address and sends mail.
The instruction to send the message:
Transport.send (msg ) ;
I noticed that this statement takes a bit of seconds before releasing
flow and therefore are unable to use the other functions of the application . I thought , therefore, to use a technology where each object of the class that sends the email implements Runnable and then i use it like a thread.
I noticed , however, that there are problems because sometimes 20 over 50 emails fail and the instruction that give me the error is
Transport.send (msg ) ;
java.net.SocketException : Connection closed by remote host
and seems to be the fact that the thread dies too fast after the statement
Transport.send (msg ) ;
So I inserted a Thread.sleep ( 10000 ) ;
but sometimes I goes equally mistaken, then I tried to employ
t.join ();
but it blocks the flow (basically waiting for the thread to end it all before giving way to another )
What can I do ?
If you need I can write a few lines of code to make you understand how I'm implementing the functionality described
I look forward ideas
thanks
How about something like this (outline only, off the top of my head)
If you want to send the same message to all recipients
then simply.
....
Transport transport = session.getTransport(TRANSPORT);
//set up session
//set up message
MimeMessage message = new MimeMessage(session);
....
//for each recipient
message.addRecipient(Message.RecipientType.TO, toAddress); //or CC, BCC
....
Transport transport = session.getTransport("smtp");
transport.connect(HOST, USERNAME, PASSWORD);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
wrap it in a thread if you don't want the main to block
If you want to send a different message to each recipient then something
like
class MailMachine implements Runnable{
EmailAddressServer eas;
EmailMessageServer ems;
...
List<String> emailAddresses = eas.getAddresses();
...
//set up mail session
Session session = Session.getInstance(properties);
...
public void run(){
for(String email: emailAddresses){
MimeMessage message = new MimeMessage(session);
String msg = ems.getMessage(email); //whatever
//blocking IO
...
Transport.send(message);
...
}
}
}
public class Foo{
main(){
// do stuff
...
MailMachine mm = new MailMachine();
Thread t = new Thread(mm);
t.start();
...
//do more stuff
}
}
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