Software Development in North Wales

Just found this simple example for sending email (via SMTP) without using any extra libraries:

//This works without any extra libraries!
//Code adapted from http://www.javaworld.com/javaworld/javatips/jw-javatip36-p3.html
//and Craig Morrall

String sender = '';
String reciever = '';
String subject = 'This message is coming from Processing';
String message = 'Mail Message';
String mailServer = 'postbox.gold.ac.uk';

//strange java thing to get a correct carriage return
String carriageReturn = System.getProperty('line.separator');

void setup()
{
sendMessage();
}

void sendMessage()
{
println('Trying...');
try {

//connect to the mail server
Socket socket = new Socket(mailServer, 25);

//create an in and out connection
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
DataInputStream in = new DataInputStream(socket.getInputStream());

//ask your machine what it's really called
String hostname = InetAddress.getLocalHost().getHostName();
println('HOST: '+hostname);

//converse with the mail server
readIn(in);
sendEmail(out, in, 'HELO ' + hostname + carriageReturn);
readIn(in);
sendEmail(out, in, 'RSET' + carriageReturn);
readIn(in);
//tell the mail server your email
sendEmail(out, in, 'MAIL FROM: ' + sender + carriageReturn);
readIn(in);
//tell the mail server where you want to send the message
sendEmail(out, in, 'RCPT TO: ' + reciever + carriageReturn);
readIn(in);
//start the message body
sendEmail(out, in, 'DATA' + carriageReturn);
readIn(in);
sendEmail(out, in, 'To:' + reciever + carriageReturn);
sendEmail(out, in, 'From:' + sender + carriageReturn);
sendEmail(out, in, 'Subject: ' + subject + carriageReturn);
sendEmail(out, in, message);

//close the message body
sendEmail(out, in, carriageReturn + "." + carriageReturn);
//end of message body

//end the conversation
readIn(in);
sendEmail(out, in, "QUIT" + carriageReturn);
readIn(in);

//close the connections
in.close();
out.close();

println("Message '" + subject + "' sent to '" + reciever + "'");

}//end of try statement
catch (UnknownHostException e)
{
println("Unknown Host Exception: " + e);
}//end of catch statement
catch(IOException e)
{
println("Send failure: " + e);
}//end of catch statement

}//end of method sendMessage

void sendEmail(DataOutputStream out, DataInputStream in, String stringHolder)
throws IOException
{

if(stringHolder != null)
{
out.writeBytes(stringHolder);
println(stringHolder);
}//end of if statement

}//end of method sendEmail

void readIn(DataInputStream in)
throws IOException
{
String record;

if ((record = in.readLine()) != null)
{
println("Message from host: "+record);
}//end of if statement

}//end of method readIn