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Title Program to develop a Mail Client in Java.
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Category Java » Networking
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import java.awt.*; import java.awt.event.*; import java.util.*; import java.net.*; import java.io.*; import javax.swing.*; public class MailClient { public static void main(String []args) { JFrame frame = new MailClientFrame(); frame.show(); } } class MailClientFrame extends JFrame implements ActionListener { private BufferedReader in; private PrintWriter out; private JTextField from; private JTextField to; private JTextField smtpServer; private JTextArea message; private JTextArea response; private JLabel fromLbl; private JLabel toLbl; private JLabel serverLbl; public MailClientFrame() { setTitle("Mail Client"); setSize(250,400); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } } ); getContentPane().setLayout(new FlowLayout(FlowLayout.LEFT)); fromLbl = new JLabel("From: "); getContentPane().add(fromLbl); from = new JTextField(20); getContentPane().add(from); toLbl = new JLabel("To: "); getContentPane().add(toLbl); to = new JTextField(20); getContentPane().add(to); serverLbl = new JLabel("SMTP Server:"); getContentPane().add(serverLbl); smtpServer = new JTextField(20); getContentPane().add(smtpServer); message = new JTextArea(5,20); getContentPane().add(message); JScrollPane p = new JScrollPane(message); getContentPane().add(p); response = new JTextArea(5,20); getContentPane().add(response); JScrollPane p1 = new JScrollPane(response); getContentPane().add(p1); JButton sendButton = new JButton("Send"); sendButton.addActionListener(this); JPanel buttonPanel = new JPanel(); buttonPanel.add(sendButton); getContentPane().add(sendButton); } public void actionPerformed(ActionEvent evt) { SwingUtilities.invokeLater(new Runnable() { public void run() { sendMail(); } } ); } public void sendMail() { try { Socket s = new Socket(smtpServer.getText(),25); out = new PrintWriter(s.getOutputStream()); in = new BufferedReader(new InputStreamReader(s.getInputStream())); String hostName = InetAddress.getLocalHost().getHostName(); send(null); send("HELO" + hostName); send("MAIL FROM:"+ from.getText()); send("RCPT TO:" + to.getText()); send("DATA"); out.println(message.getText()); send("."); s.close(); } catch(IOException e) { response.append("Error:" + e); } } public void send(String s) throws IOException { if(s!=null) { response.append(s+" "); out.println(s); out.flush(); } String line; if ( (line = in.readLine())!=null) { response.append(line+" "); } } }

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