Download Writing Simple Email Clients in Java

Writing Simple Email Clients in
Java
• Email Using Sockets
• Email using the JavaMail API
Email Using Sockets (Linden
Chapter 17)
// See page 571 of Linden's Just Java Fifth Edition
import java.io.*;
import java.net.*;
public class SimpleEmailClient {
public static void main(String args[]) throws IOException {
Socket sock;
DataInputStream dis;
PrintStream ps;
// open a socket to an email server on port 25
sock = new Socket("cyrus.andrew.cmu.edu",25);
dis = new DataInputStream(sock.getInputStream());
ps = new PrintStream(sock.getOutputStream());
// talk email
ps.println("mail from: [email protected]");
System.out.println(dis.readLine());
String Addressee = "[email protected]";
ps.println("rcpt to: " + Addressee);
System.out.println(dis.readLine());
ps.println("data");
System.out.println(dis.readLine());
ps.println("A message sent by a Java client using sockets");
ps.println(".");
System.out.println(dis.readLine());
ps.flush();
sock.close();
}
}
Output Echos from Cyrus
D:\McCarthy\www\95-713\JavaMail>java SimpleEmailClient
220-mail-fe2.andrew.cmu.edu ESMTP Sendmail 8.12.3.Beta2/8.12.3.
Beta2
220-Mis-identifing the sender of mail is an abuse of computing
facilites.
220 ESMTP spoken here
250 2.1.0 [email protected]... Sender ok
Using JavaMail
// A simple example using JavaMail
import java.io.*;
import java.net.InetAddress;
import java.util.Properties;
import java.util.Date;
import javax.mail.*;
import javax.mail.internet.*;
public class Mailer {
String to, from, msg;
public Mailer(String to, String from, String msg) {
this.to = to;
this.from = from;
this.msg = msg;
}
public void send() {
Session s = createSession();
try {
Message mess = createMessage(s, msg);
Transport.send(mess);
}
catch(MessagingException e) {
System.out.println("Messaging Exception: "+e);
}
catch(Exception e ) {
System.out.println("Exception thrown" + e);
}
}
private Session createSession() {
Properties p = System.getProperties();
p.setProperty("mail.transport.protocol", "smtp");
p.setProperty("mail.smtp.host","cyrus.andrew.cmu.edu");
Session sess = Session.getDefaultInstance(p);
return sess;
}
private Message createMessage(Session sess, String msg)throws
MessagingException{
Message mess = new MimeMessage(sess);
mess.setFrom(new InternetAddress(from));
mess.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(to, false));
mess.setSubject("Warning");
mess.setText(msg);
mess.setSentDate(new Date());
return mess;
}
public static void main(String a[]) {
Mailer mailman = new Mailer("[email protected]",
"[email protected]", "It's hot");
mailman.send();
}
}
Installation Instructions
Visit http://java.sun.com/products/javamail
1. Download the JavaMail API
Implementation Version 1.3ea
2. Download the JavaBeans Activation
Framework 1.0.2ea
3. Unzip both files.
4. Add the following files to your classpath:
–
–
mail.jar (JavaMail)
activation.jar (JAF file)