Mega Code Archive
This program shows how to use sockets to send plain text mail messages
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/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Scanner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingWorker;
/**
* This program shows how to use sockets to send plain text mail messages.
* @author Cay Horstmann
* @version 1.11 2007-06-25
*/
public class MailTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new MailTestFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* The frame for the mail GUI.
*/
class MailTestFrame extends JFrame
{
public MailTestFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
setTitle("MailTest");
setLayout(new GridBagLayout());
// we use the GBC convenience class of Core Java Volume 1 Chapter 9
add(new JLabel("From:"), new GBC(0, 0).setFill(GBC.HORIZONTAL));
from = new JTextField(20);
add(from, new GBC(1, 0).setFill(GBC.HORIZONTAL).setWeight(100, 0));
add(new JLabel("To:"), new GBC(0, 1).setFill(GBC.HORIZONTAL));
to = new JTextField(20);
add(to, new GBC(1, 1).setFill(GBC.HORIZONTAL).setWeight(100, 0));
add(new JLabel("SMTP server:"), new GBC(0, 2).setFill(GBC.HORIZONTAL));
smtpServer = new JTextField(20);
add(smtpServer, new GBC(1, 2).setFill(GBC.HORIZONTAL).setWeight(100, 0));
message = new JTextArea();
add(new JScrollPane(message), new GBC(0, 3, 2, 1).setFill(GBC.BOTH).setWeight(100, 100));
comm = new JTextArea();
add(new JScrollPane(comm), new GBC(0, 4, 2, 1).setFill(GBC.BOTH).setWeight(100, 100));
JPanel buttonPanel = new JPanel();
add(buttonPanel, new GBC(0, 5, 2, 1));
JButton sendButton = new JButton("Send");
buttonPanel.add(sendButton);
sendButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
new SwingWorker<Void, Void>()
{
protected Void doInBackground() throws Exception
{
comm.setText("");
sendMail();
return null;
}
}.execute();
}
});
}
/**
* Sends the mail message that has been authored in the GUI.
*/
public void sendMail()
{
try
{
Socket s = new Socket(smtpServer.getText(), 25);
InputStream inStream = s.getInputStream();
OutputStream outStream = s.getOutputStream();
in = new Scanner(inStream);
out = new PrintWriter(outStream, true /* autoFlush */);
String hostName = InetAddress.getLocalHost().getHostName();
receive();
send("HELO " + hostName);
receive();
send("MAIL FROM: <" + from.getText() + ">");
receive();
send("RCPT TO: <" + to.getText() + ">");
receive();
send("DATA");
receive();
send(message.getText());
send(".");
receive();
s.close();
}
catch (IOException e)
{
comm.append("Error: " + e);
}
}
/**
* Sends a string to the socket and echoes it in the comm text area.
* @param s the string to send.
*/
public void send(String s) throws IOException
{
comm.append(s);
comm.append("\n");
out.print(s.replaceAll("\n", "\r\n"));
out.print("\r\n");
out.flush();
}
/**
* Receives a string from the socket and displays it in the comm text area.
*/
public void receive() throws IOException
{
String line = in.nextLine();
comm.append(line);
comm.append("\n");
}
private Scanner in;
private PrintWriter out;
private JTextField from;
private JTextField to;
private JTextField smtpServer;
private JTextArea message;
private JTextArea comm;
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 300;
}
/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
GBC - A convenience class to tame the GridBagLayout
Copyright (C) 2002 Cay S. Horstmann (http://horstmann.com)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
This class simplifies the use of the GridBagConstraints
class.
*/
class GBC extends GridBagConstraints
{
/**
Constructs a GBC with a given gridx and gridy position and
all other grid bag constraint values set to the default.
@param gridx the gridx position
@param gridy the gridy position
*/
public GBC(int gridx, int gridy)
{
this.gridx = gridx;
this.gridy = gridy;
}
/**
Constructs a GBC with given gridx, gridy, gridwidth, gridheight
and all other grid bag constraint values set to the default.
@param gridx the gridx position
@param gridy the gridy position
@param gridwidth the cell span in x-direction
@param gridheight the cell span in y-direction
*/
public GBC(int gridx, int gridy, int gridwidth, int gridheight)
{
this.gridx = gridx;
this.gridy = gridy;
this.gridwidth = gridwidth;
this.gridheight = gridheight;
}
/**
Sets the anchor.
@param anchor the anchor value
@return this object for further modification
*/
public GBC setAnchor(int anchor)
{
this.anchor = anchor;
return this;
}
/**
Sets the fill direction.
@param fill the fill direction
@return this object for further modification
*/
public GBC setFill(int fill)
{
this.fill = fill;
return this;
}
/**
Sets the cell weights.
@param weightx the cell weight in x-direction
@param weighty the cell weight in y-direction
@return this object for further modification
*/
public GBC setWeight(double weightx, double weighty)
{
this.weightx = weightx;
this.weighty = weighty;
return this;
}
/**
Sets the insets of this cell.
@param distance the spacing to use in all directions
@return this object for further modification
*/
public GBC setInsets(int distance)
{
this.insets = new Insets(distance, distance, distance, distance);
return this;
}
/**
Sets the insets of this cell.
@param top the spacing to use on top
@param left the spacing to use to the left
@param bottom the spacing to use on the bottom
@param right the spacing to use to the right
@return this object for further modification
*/
public GBC setInsets(int top, int left, int bottom, int right)
{
this.insets = new Insets(top, left, bottom, right);
return this;
}
/**
Sets the internal padding
@param ipadx the internal padding in x-direction
@param ipady the internal padding in y-direction
@return this object for further modification
*/
public GBC setIpad(int ipadx, int ipady)
{
this.ipadx = ipadx;
this.ipady = ipady;
return this;
}
}
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