email.txt

用JAVA 实现的 email客户端代码

  *
  * @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 VisualCafe. 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 VisualCafe to route the events to the correct
  * functions.
  *
  * @author VisualCafe
  * @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("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);

 }
}  

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());