Patchy MIDlet : Networks « J2ME « Java






Patchy MIDlet

Patchy MIDlet
/*
Wireless Java 2nd edition 
Jonathan Knudsen
Publisher: Apress
ISBN: 1590590775 
*/
import java.io.*;

import javax.microedition.io.*;
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));
      mForm.setCommandListener(this);
    }
    
    Thread t = new Thread(this);
    t.start();
    
    mDisplay.setCurrent(mForm);
  }

  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);
    //si.setLayout(Item.LAYOUT_NEWLINE_AFTER);
    mForm.append(si);
  }
  
  private void shutdown() {
    mTrucking = false;
    try { mServerSocketConnection.close(); }
    catch (IOException ioe) {}
  }
  
  public void commandAction(Command c, Displayable s) {
    if (c.getCommandType() == Command.EXIT) {
      shutdown();
      notifyDestroyed();
    }
  }

  public void run() {
    try {
      mServerSocketConnection = (ServerSocketConnection)
          Connector.open("socket://:80");
      log("Startup complete.");
      SocketConnection sc = null;
      while (mTrucking) {
        sc = (SocketConnection)
          mServerSocketConnection.acceptAndOpen();
        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(
            sc.openInputStream());
        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");
        out.print(getMessage());
        out.close();
        in.close();
        sc.close();
      }
    }
    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 = in.read()) != -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;
  }
}


           
       








Related examples in the same category

1.MIDlet to invoke a CGI script.
2.MIDlet to invoke a CGI script (POST method is used)
3.Https MIDlet
4.Pass a cookie (stored in rms) between the MIDlet and a Java servlet.
5.Use GET or POST to communicate with a Java servlet.
6.Use Java servlets sessions to tally golf scores.
7.Http Test
8.An example MIDlet to invoke a CGI script.An example MIDlet to invoke a CGI script.
9.Timer ServerTimer Server
10.Http ExampleHttp Example
11.Socket connectionSocket connection
12.Http ConnectionHttp Connection
13.Cookie MIDletCookie MIDlet
14.JargoneerJargoneer
15.Post MIDlet
16.MIDlet to invoke a CGI script (GET method).MIDlet to invoke a CGI script (GET method).
17.Fetch Page MidletFetch Page Midlet
18.Invoke Servlet Midlet 2
19.Invoke Servlet Midlet 1
20.MIDlet to invoke a CGI script (POST method is used) (2)MIDlet to invoke a CGI script (POST method is used) (2)
21.Demonstrates the functionality of DatagramConnection framework.Demonstrates the functionality of DatagramConnection framework.
22.Sample to demonstrate Http GET and POST from MIDlet
23.Get file from networkGet file from network
24.Midlet Servlet 2Midlet Servlet 2
25.MIDlet to fetch a page using an HttpConnectionMIDlet to fetch a page using an HttpConnection
26.A simple network clientA simple network client
27.Send client request and Get server responseSend client request and Get server response
28.Socket MIDletSocket MIDlet
29.www.amazon.com Book Ranking MIDletwww.amazon.com Book Ranking MIDlet
30.Time Server
31.Http MIDletHttp MIDlet
32.DatagramSenderDatagramSender
33.Datagram Receiver