socketmidlet.java

jave mobile的网络通讯程序

/*
 *
 * Copyright (c) 2007, Sun Microsystems, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * 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.
 *  * Neither the name of Sun Microsystems nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 */
package socket;

import java.io.*;

import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;


public class SocketMIDlet extends MIDlet implements CommandListener {
    private static final String SERVER = "Server";
    private static final String CLIENT = "Client";
    private static final String[] names = { SERVER, CLIENT };
    private static Display display;
    private Form f;
    private ChoiceGroup cg;
    private boolean isPaused;
    private Server server;
    private Client client;
    private Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private Command startCommand = new Command("Start", Command.ITEM, 1);

    public SocketMIDlet() {
        display = Display.getDisplay(this);
        f = new Form("Socket Demo");
        cg = new ChoiceGroup("Please select peer", Choice.EXCLUSIVE, names, null);
        f.append(cg);

        f.addCommand(exitCommand);
        f.addCommand(startCommand);
        f.setCommandListener(this);

        display.setCurrent(f);
    }

    public boolean isPaused() {
        return isPaused;
    }

    public void startApp() {
        isPaused = false;
    }

    public void pauseApp() {
        isPaused = true;
    }

    public void destroyApp(boolean unconditional) {
        if (server != null) {
            server.stop();
        }

        if (client != null) {
            client.stop();
        }
    }

    public void commandAction(Command c, Displayable s) {
        if (c == exitCommand) {
            destroyApp(true);
            notifyDestroyed();
        } else if (c == startCommand) {
            String name = cg.getString(cg.getSelectedIndex());

            if (name.equals(SERVER)) {
                server = new Server(this);
                server.start();
            } else {
                client = new Client(this);
                client.start();
            }
        }
    }
}