Help! I can't compile this program

Question

I copied the following program from E.Harold's book,Java Network Programming,online edition.The file name is SMTPClient.java.Its function is sending simple mails.
When I compiled the file,there were 6 error messages indicating that the first 6 lines of code were wrong.The reasons are something like "class" or "interface" needed.
Can anybody give me some advice?
Source file:
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class SMTPClient extends JFrame {
private JButton sendButton = new JButton("Send Message");
private JLabel fromLabel = new JLabel("From: ");
private JLabel toLabel = new JLabel("To: ");
private JLabel hostLabel = new JLabel("SMTP Server: ");
private JLabel subjectLabel = new JLabel("Subject: ");
private JTextField fromField = new JTextField(40);
private JTextField toField = new JTextField(40);
private JTextField hostField = new JTextField(40);
private JTextField subjectField = new JTextField(40);
private JTextArea message = new JTextArea(40, 72);
private JScrollPane jsp = new JScrollPane(message);
public SMTPClient() {
super("SMTP Client");
Container contentPane = this.getContentPane();
contentPane.setLayout(new BorderLayout());
JPanel labels = new JPanel();
labels.setLayout(new GridLayout(4, 1));
labels.add(hostLabel);
JPanel fields = new JPanel();
fields.setLayout(new GridLayout(4, 1));
String host = System.getProperty("mail.host", "");
hostField.setText(host);
fields.add(hostField);
labels.add(toLabel);
fields.add(toField);
String from = System.getProperty("mail.from", "");
fromField.setText(from);
labels.add(fromLabel);
fields.add(fromField);
labels.add(subjectLabel);
fields.add(subjectField);
Box north = Box.createHorizontalBox();
north.add(labels);
north.add(fields);
contentPane.add(north, BorderLayout.NORTH);
message.setFont(new Font("Monospaced", Font.PLAIN, 12));
contentPane.add(jsp, BorderLayout.CENTER);
JPanel south = new JPanel();
south.setLayout(new FlowLayout(FlowLayout.CENTER));
south.add(sendButton);
sendButton.addActionListener(new SendAction());
contentPane.add(south, BorderLayout.SOUTH);
this.pack();
class SendAction implements ActionListener {
public void actionPerformed(ActionEvent evt) {
try {
Properties props = new Properties();
props.put("mail.host", hostField.getText());
Session mailConnection = Session.getInstance(props, null);
final Message msg = new MimeMessage(mailConnection);
Address to = new InternetAddress(toField.getText());
Address from = new InternetAddress(fromField.getText());
msg.setContent(message.getText(), "text/plain");
msg.setFrom(from);
msg.setRecipient(Message.RecipientType.TO, to);
msg.setSubject(subjectField.getText());
// This can take a non-trivial amount of time so
// spawn a thread to handle it.
Runnable r = new Runnable() {
public void run() {
try {
Transport.send(msg);
catch (Exception ex) {
ex.printStackTrace();
Thread t = new Thread(r);
t.start();
message.setText("");
catch (Exception ex) {
// I should really bring up a more specific error dialog here.
ex.printStackTrace();
public static void main(String[] args) {
SMTPClient client = new SMTPClient();
// Next line requires Java 1.3 or later. I want to set up the
// exit behavior here rather than in the constructor since
// other programs that use this class may not want to exit
// the application when the SMTPClient window closes.
client.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
client.show();
Message was edited by:
oscarhua

Answer 1

1:install Java SE,set the path variable to the directory of the bin folder(including bin).
2:download the JavaMail 1.4 release from http://java.sun.com/products/javamail/downloads/index.html
3:extract the downloaded file to any location and add the directory of its mail.jar file to classpath.
4:download the JavaBeans Activation Framework 1.1release from
http://java.sun.com/products/javabeans/jaf/downloads/index.html#download
5:extract the downloaded file to any location and add the directory of its activation.jar file to classpath.
then everything goes smoothly
You inspired me and voronetskyy told me exactly what to do,so thak both of you again!:-)
Message was edited by:
oscarhua