import java.awt.*;import javax.swing.*;/** * Example program from Chapter 1 * Programming Spiders, Bots and Aggregators in Java * Copyright 2001 by Jeff Heaton * * SendMail is an example of client sockets.  This program * presents a simple dialog box that prompts the user for * information about how to send a mail. * * @author Jeff Heaton * @version 1.0 */public class SendMail extends javax.swing.JFrame {  /**   * The constructor.  Do all basic setup for this   * application.   */  public SendMail()  {    //{{INIT_CONTROLS    setTitle("SendMail Example");    getContentPane().setLayout(null);    setSize(736,312);    setVisible(false);    JLabel1.setText("From:");    getContentPane().add(JLabel1);    JLabel1.setBounds(12,12,36,12);    JLabel2.setText("To:");    getContentPane().add(JLabel2);    JLabel2.setBounds(12,48,36,12);    JLabel3.setText("Subject:");    getContentPane().add(JLabel3);    JLabel3.setBounds(12,84,48,12);    JLabel4.setText("SMTP Server:");    getContentPane().add(JLabel4);    JLabel4.setBounds(12,120,84,12);    getContentPane().add(_from);    _from.setBounds(96,12,300,24);    getContentPane().add(_to);    _to.setBounds(96,48,300,24);    getContentPane().add(_subject);    _subject.setBounds(96,84,300,24);    getContentPane().add(_smtp);    _smtp.setBounds(96,120,300,24);    getContentPane().add(_scrollPane2);    _scrollPane2.setBounds(12,156,384,108);    _body.setText("Enter your message here.");    _scrollPane2.getViewport().add(_body);    _body.setBounds(0,0,381,105);    Send.setText("Send");    Send.setActionCommand("Send");    getContentPane().add(Send);    Send.setBounds(60,276,132,24);    Cancel.setText("Cancel");    Cancel.setActionCommand("Cancel");    getContentPane().add(Cancel);    Cancel.setBounds(216,276,120,24);    getContentPane().add(_scrollPane);    _scrollPane.setBounds(408,12,312,288);    getContentPane().add(_output);    _output.setBounds(408,12,309,285);    //}}    //{{INIT_MENUS    //}}    //{{REGISTER_LISTENERS    SymAction lSymAction = new SymAction();    Send.addActionListener(lSymAction);    Cancel.addActionListener(lSymAction);    //}}    _output.setModel(_model);    _model.addElement("Server output displayed here:");    _scrollPane.getViewport().setView(_output);    _scrollPane2.getViewport().setView(_body);  }  /**   * Moves the app to the correct position   * when it is made visible.   *   * @param b True to make visible, false to make   * invisible.   */  public void setVisible(boolean b)  {    if ( b )      setLocation(50, 50);    super.setVisible(b);  }  /**   * The main function basically just creates a new object,   * then shows it.   *   * @param args Command line arguments.   * Not used in this application.   */  static public void main(String args[])  {    (new SendMail()).show();  }  /**   * Created by Visual Cafe.  Sets the window size.   */  public void addNotify()  {    // Record the size of the window prior to    // calling parents addNotify.    Dimension size = getSize();    super.addNotify();    if ( frameSizeAdjusted )      return;    frameSizeAdjusted = true;    // Adjust size of frame according to the    // insets and menu bar    Insets insets = getInsets();    javax.swing.JMenuBar menuBar =      getRootPane().getJMenuBar();    int menuBarHeight = 0;    if ( menuBar != null )      menuBarHeight = menuBar.getPreferredSize().height;    setSize(insets.left            + insets.right            + size.width,            insets.top            + insets.bottom            + size.height            + menuBarHeight);  }  // Used by addNotify  boolean frameSizeAdjusted = false;  //{{DECLARE_CONTROLS  /**   * A label.   */  javax.swing.JLabel JLabel1 =    new javax.swing.JLabel();  /**   * A label.   */  javax.swing.JLabel JLabel2 =    new javax.swing.JLabel();  /**   * A label.   */  javax.swing.JLabel JLabel3 =    new javax.swing.JLabel();  /**   * A label.   */  javax.swing.JLabel JLabel4 =    new javax.swing.JLabel();  /**   * Who this message is from.   */  javax.swing.JTextField _from =    new javax.swing.JTextField();  /**   * Who this message is to.   */  javax.swing.JTextField _to =    new javax.swing.JTextField();  /**   * The subject of this message.   */  javax.swing.JTextField _subject =    new javax.swing.JTextField();  /**   * The SMTP server to use to send this message.   */  javax.swing.JTextField _smtp =    new javax.swing.JTextField();  /**   * A scroll pane.   */  javax.swing.JScrollPane _scrollPane2 =    new javax.swing.JScrollPane();  /**   * The body of this email message.   */  javax.swing.JTextArea _body =    new javax.swing.JTextArea();  /**   * The send button.   */  javax.swing.JButton Send =    new javax.swing.JButton();  /**   * The cancel button.   */  javax.swing.JButton Cancel =    new javax.swing.JButton();  /**   * A scroll pain.   */  javax.swing.JScrollPane _scrollPane  = new javax.swing.JScrollPane();  /**   * The output area.  Server messages   * are displayed here.   */  javax.swing.JList _output =    new javax.swing.JList();  //}}  /**   * The list of items added to the output   * list box.   */  javax.swing.DefaultListModel _model  = new javax.swing.DefaultListModel();  /**   * Input from the socket.   */  java.io.BufferedReader _in;  /**   * Output to the socket.   */  java.io.PrintWriter _out;  //{{DECLARE_MENUS  //}}  /**   * Internal class created by Visual Cafe to   * route the events to the correct functions.   *   * @author Visual Cafe   * @version 1.0   */  class SymAction    implements java.awt.event.ActionListener {    /**     * Route the event to the correction method.     *     * @param event The event.     */    public void actionPerformed      (java.awt.event.ActionEvent event)    {      Object object = event.getSource();      if ( object == Send )        Send_actionPerformed(event);      else if ( object == Cancel )        Cancel_actionPerformed(event);    }  }  /**   * Called to actually send a string of text to the   * socket.  This method makes note of the text sent   * and the response in the JList output box.  Pass a   * null value to simply wait for a response.   *   * @param s A string to be sent to the socket.   * null to just wait for a response.   * @exception java.io.IOException   */  protected void send(String s) throws java.io.IOException  {    // Send the SMTP command    if ( s!=null ) {      _model.addElement("C:"+s);      _out.println(s);      _out.flush();    }    // Wait for the response    String line = _in.readLine();    if ( line!=null ) {      _model.addElement("S:"+line);    }  }  /**   * Called when the send button is clicked.  Actually   * sends the mail message.   *   * @param event The event.   */  void Send_actionPerformed(java.awt.event.ActionEvent event)  {    try {      java.net.Socket s      = new java.net.Socket( _smtp.getText(),25 );      _out = new java.io.PrintWriter(s.getOutputStream());      _in = new java.io.BufferedReader(        new java.io.InputStreamReader(s.getInputStream()));      send(null);      send("HELO " +           java.net.InetAddress.getLocalHost().getHostName() );      send("MAIL FROM: " + _from.getText() );      send("RCPT TO: " + _to.getText() );      send("DATA");      _out.println("Subject:" + _subject.getText());      _out.println( _body.getText() );      send(".");      s.close();    } catch ( Exception e ) {      _model.addElement("Error: " + e );    }  }  /**   * Called when cancel is clicked.  End the application.   *   * @param event The event.   */  void Cancel_actionPerformed(java.awt.event.ActionEvent event)  {    System.exit(0);  }}