socketclient.java

这是我在测试手机java程序时候做的关于手机java及时聊天的工具

/*
 * @(#)SocketClient.java
 *
 * Copyright (c) 2003 Qualcomm, Inc. All rights reserved.
 * PROPRIETARY/CONFIDENTIAL
 * Use is subject to license terms
 */
package com.qualcomm.demo.instantchat;

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

public class SocketClient implements Runnable, CommandListener {

    private InstantChat parent;
    private Display display;
    private Form f;
    private StringItem si;
    private TextField tf;
    private boolean stop;
    private boolean connected = false;
    private static int KNOWN_PORT = 40000;

    private Command sendCommand = new Command("Send", Command.ITEM, 1);
    private Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private TextField tfAddr = new TextField("Remote host:",
                                             "129.46.223.132:40000", 30,
                                              TextField.ANY);

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

    public SocketClient(InstantChat m) {

        parent = m;
        display = Display.getDisplay(parent);
        f = new Form("Chat Session - Socket");
        si = new StringItem("Status:" , "Not connected");
        tf = new TextField("Send:", "", 30, TextField.ANY);

        f.append(si);
        f.append(tfAddr);
        f.append(tf);
        f.addCommand(sendCommand);
        f.addCommand(exitCommand);
        f.setCommandListener(this);
        display.setCurrent(f);
    }

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

    synchronized private void waitForConnect()
    {
      try {
        wait();
      }
      catch (InterruptedException e) {
        throw new RuntimeException("Wait failure");
      }
    }

    synchronized private void signalConnectDone()
    {
       notify();
    }

    private void connect()
    {
      try
      {
        String host = tfAddr.getString(); //+ ":" + KNOWN_PORT;
        sc = (SocketConnection) Connector.open("socket://" + host);
        si.setText("Connected to " + host);

        is  = sc.openInputStream();
        os = sc.openOutputStream();
        sender = new SocketSender(os);
        signalConnectDone();
        connected = true;
      }
      catch (ConnectionNotFoundException cnfe) {
            cnfe.printStackTrace();
      }
      catch (IOException ioe) {
        if (!stop) {
            ioe.printStackTrace();
        }
      }
      catch (Exception e) {
        e.printStackTrace();
      }
    }

    public void run() {
        try {
            waitForConnect();

            // Start the thread for sending messages - see Sender's main
            // comment for explanation


            // 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()) {
          if (!connected)
            connect();

          sender.send(tf.getString());
        }
        else if (c == exitCommand) {
            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) {
        }
    }
}