Patchy MIDlet : Networks « J2ME « Java

Patchy MIDlet

Patchy MIDlet
Wireless Java 2nd edition 
Jonathan Knudsen
Publisher: Apress
ISBN: 1590590775 

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

public class PatchyMIDlet extends MIDlet implements CommandListener, Runnable {
  private Display mDisplay;
  private Form mForm;
  private ServerSocketConnection mServerSocketConnection;
  private boolean mTrucking = true;
  public void startApp() {
    mDisplay = Display.getDisplay(this);
    if (mForm == null) {
      mForm = new Form("PatchyMIDlet");
      mForm.addCommand(new Command("Exit", Command.EXIT, 0));
    Thread t = new Thread(this);

  public void pauseApp() {}

  public void destroyApp(boolean unconditional) { shutdown(); }
  private void log(String text) { log(null, text); }
  private void log(String label, String text) {
    StringItem si = new StringItem(label, text);
  private void shutdown() {
    mTrucking = false;
    try { mServerSocketConnection.close(); }
    catch (IOException ioe) {}
  public void commandAction(Command c, Displayable s) {
    if (c.getCommandType() == Command.EXIT) {

  public void run() {
    try {
      mServerSocketConnection = (ServerSocketConnection)
      log("Startup complete.");
      SocketConnection sc = null;
      while (mTrucking) {
        sc = (SocketConnection)
        log("client: ", sc.getAddress());
        // Strictly speaking, each client connection
        // should be handled in its own thread. For
        // simplicity, this implementation handles
        // client connections inline.
        Reader in = new InputStreamReader(
        String line;
        while ((line = readLine(in)) != null) ;
        // Ignoring the request, send a response.
        PrintStream out = new PrintStream(sc.openOutputStream());
        out.print("HTTP/1.1 200 OK\r\n\r\n");
    catch (Exception e) {
      log("exception: ", e.toString());
  private String readLine(Reader in) throws IOException {
    // This is not efficient.
    StringBuffer line = new StringBuffer();
    int i;
    while ((i = != -1) {
      char c = (char)i;
      if (c == '\n') break;
      if (c == '\r') ;
      else line.append(c);
    if (line.length() == 0) return null;
    return line.toString();
  private java.util.Random mRandom = new java.util.Random();
  private String getMessage() {
    int i = Math.abs(mRandom.nextInt()) % 5;
    String s = null;
    switch (i) {
      case 0: s = "Above all the others we'll fly"; break;
      case 1: s = "There is no reason to hide"; break;
      case 2: s = "I dreamed about Ray Charles last night"; break;
      case 3: s = "Someone keeps moving my chair"; break;
      case 4: s = "Joseph's face was black as night"; break;
      default: break;
    return s;


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