SocketApplet.java Source code

Java tutorial

Introduction

Here is the source code for SocketApplet.java

Source

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

//applet.html

/*
<HTML>
<HEAD>
<TITLE>Demo Applet: Connect to Legacy System</TITLE>
</HEAD>
<BODY BGCOLOR="96FF6F">
<H1>Demo Applet: Connect to Legacy Server</H1>
<P>Please use this applet to Login to our server server.
This will demonstrate an Applet via a Socket connection.</P>
<P>Thank you!</P>
<HR>
<APPLET CODE="SocketApplet" width=300 height=120>
</APPLET>
<HR>
<Address>Ian@DarwinSys.com</ADDRESS>
</BODY>
</HTML>
    
    
*/

import java.applet.Applet;
import java.awt.Button;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.URL;

/**
 * Socket Applet for "legacy" server connection via Socket.
 * 
 * @version $Id: SocketApplet.java,v 1.5 2004/02/09 03:33:44 ian Exp $
 * @author Ian F. Darwin, http://www.darwinsys.com/
 */
public class SocketApplet extends Applet {
    TextField nameTF, passTF, domainTF;

    Image im;

    Button sendButton;

    /** Where the Applet came from */
    URL whence;

    //+
    /** Initialize the GUI nicely. */
    public void init() {
        Label aLabel;

        setLayout(new GridBagLayout());
        int LOGO_COL = 1;
        int LABEL_COL = 2;
        int TEXT_COL = 3;
        int BUTTON_COL = 1;
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weightx = 100.0;
        gbc.weighty = 100.0;

        gbc.gridx = LABEL_COL;
        gbc.gridy = 0;
        gbc.anchor = GridBagConstraints.EAST;
        add(aLabel = new Label("Name:", Label.CENTER), gbc);
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.gridx = TEXT_COL;
        gbc.gridy = 0;
        add(nameTF = new TextField(10), gbc);

        gbc.gridx = LABEL_COL;
        gbc.gridy = 1;
        gbc.anchor = GridBagConstraints.EAST;
        add(aLabel = new Label("Password:", Label.CENTER), gbc);
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.gridx = TEXT_COL;
        gbc.gridy = 1;
        add(passTF = new TextField(10), gbc);
        passTF.setEchoChar('*');

        gbc.gridx = LABEL_COL;
        gbc.gridy = 2;
        gbc.anchor = GridBagConstraints.EAST;
        add(aLabel = new Label("Domain:", Label.CENTER), gbc);
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.gridx = TEXT_COL;
        gbc.gridy = 2;
        add(domainTF = new TextField(10), gbc);
        sendButton = new Button("Send data");
        gbc.gridx = BUTTON_COL;
        gbc.gridy = 3;
        gbc.gridwidth = 3;
        add(sendButton, gbc);

        whence = getCodeBase();

        // Now the action begins...
        sendButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                String name = nameTF.getText();
                if (name.length() == 0) {
                    showStatus("Name required");
                    return;
                }
                String domain = domainTF.getText();
                if (domain.length() == 0) {
                    showStatus("Domain required");
                    return;
                }
                showStatus("Connecting to host " + whence.getHost() + " as " + nameTF.getText());

                try {
                    Socket s = new Socket(getCodeBase().getHost(), 3333);
                    PrintWriter pf = new PrintWriter(s.getOutputStream(), true);
                    // send login name
                    pf.println(nameTF.getText());
                    // passwd
                    pf.println(passTF.getText());
                    // and domain
                    pf.println(domainTF.getText());

                    BufferedReader is = new BufferedReader(new InputStreamReader(s.getInputStream()));
                    String response = is.readLine();
                    showStatus(response);
                } catch (IOException e) {
                    showStatus("ERROR: " + e.getMessage());
                }
            }
        });
    }
    //-
}