client.java

一个midlet应用模型 非常经典的例子 大家可以看看 非常经典

/*
 * @(#)Client.java	1.4 03/03/02
 *
 * Copyright (c) 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms
 */
package example.socket;

import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;

public class Client 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);

    InputStream is;
    OutputStream os;
    SocketConnection sc;
    Sender sender;

    public Client(SocketMIDlet m) {

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

    /**
     * Start the client thread
     */
    public void start() {
        Thread t = new Thread(this);
        t.start();
    }

    public void run() {
        try {

            sc = (SocketConnection) Connector.open("socket://localhost:5000");

            si.setText("Connected to server");

            is  = sc.openInputStream();
            os = sc.openOutputStream();

            // Start the thread for sending messages - see Sender's main
            // comment for explanation
            sender = new Sender(os);

            // Loop forever, receiving data
            while (true) {
                StringBuffer sb = new StringBuffer();
                int c = 0;
                while (((c = is.read()) != '\n') && (c != -1)) {
                    sb.append((char) c);
                }

                // Display message to user
                si.setText("Message received - " + sb.toString());
            }

        } catch (ConnectionNotFoundException cnfe) {
            Alert a = new Alert("Client", "Please run Server MIDlet first",
                                null, AlertType.ERROR);
            a.setTimeout(Alert.FOREVER);
            a.setCommandListener(this);
            display.setCurrent(a);
        } catch (IOException ioe) {
            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) {
            parent.notifyDestroyed();
            parent.destroyApp(true);
        }
    }

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

            stop = true;
            sender.stop();

            if (is != null) {
                is.close();
            }
            if (os != null) {
                os.close();
            }
            if (sc != null) {
                sc.close();
            }
        }
        catch (IOException ioe) {
        }
    }

}