server.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 Server implements Runnable, CommandListener {

    private SocketMIDlet parent;
    private Display display;
    private Form f;
    private StringItem si;
    private TextField tf;
    private boolean stop;
    private Command sendCommand = new Command("Send", Command.ITEM, 1);
    private Command exitCommand = new Command("Exit", Command.EXIT, 1);
    InputStream is;
    OutputStream os;
    SocketConnection sc;
    ServerSocketConnection scn;
    Sender sender;

    public Server(SocketMIDlet m) {
        parent = m;
        display = Display.getDisplay(parent);
        f = new Form("Socket Server");
        si = new StringItem("Status:", " ");
        tf = new TextField("Send:", "", 30, TextField.ANY);
        f.append(si);
        f.append(tf);
        f.addCommand(exitCommand);
        f.setCommandListener(this);
        display.setCurrent(f);
    }

    public void start() {
        Thread t = new Thread(this);
        t.start();
    }

    public void run() {
        try {
            while (true) { //infinite loop to let the server be always ready for connection (code by robin_alden, issue #126227)
                si.setText("Waiting for connection");
                scn = (ServerSocketConnection) Connector.open("socket://:5000");

                // Wait for a connection.
                sc = (SocketConnection) scn.acceptAndOpen();
                si.setText("Connection accepted");
                is = sc.openInputStream();
                os = sc.openOutputStream();
                sender = new Sender(os);

                // Allow sending of messages only after Sender is created
                f.addCommand(sendCommand);

                while (true) {
                    StringBuffer sb = new StringBuffer();
                    int c = 0;

                    while (((c = is.read()) != '\n') && (c != -1)) {
                        sb.append((char) c);
                    }

                    if (c == -1) {
                        break;
                    }

                    si.setText("Message received - " + sb.toString());
                }

                stop();
                si.setText("Connection is closed");
                f.removeCommand(sendCommand);
                Thread.sleep(3000);
            }
        } catch (IOException ioe) {
            if (ioe.getMessage().equals("ServerSocket Open")) {
                Alert a = new Alert("Server", "Port 5000 is already taken.", null, AlertType.ERROR);
                a.setTimeout(Alert.FOREVER);
                a.setCommandListener(this);
                display.setCurrent(a);
            } else {
                if (!stop) {
                    ioe.printStackTrace();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void commandAction(Command c, Displayable s) {
        if ((c == sendCommand) && !parent.isPaused()) {
            sender.send(tf.getString());
        }

        if ((c == Alert.DISMISS_COMMAND) || (c == exitCommand)) {
            parent.notifyDestroyed();
            parent.destroyApp(true);
        }
    }

    /**
     * Close all open streams
     */
    public void stop() {
        try {
            stop = true;

            if (is != null) {
                is.close();
            }

            if (os != null) {
                os.close();
            }

            if (sc != null) {
                sc.close();
            }

            if (scn != null) {
                scn.close();
            }
        } catch (IOException ioe) {
        }
    }
}