Jargoneer : Networks « J2ME « Java


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.*;

public class Jargoneer extends MIDlet
    implements CommandListener, Runnable {
  private Display mDisplay;

  private Command mExitCommand, mFindCommand, mCancelCommand;

  private TextBox mSubmitBox;
  private Form mProgressForm;
  private StringItem mProgressString;

  public Jargoneer() {
    mExitCommand = new Command("Exit", Command.EXIT, 0);
    mFindCommand = new Command("Find", Command.SCREEN, 0);
    mCancelCommand = new Command("Cancel", Command.CANCEL, 0);
    mSubmitBox = new TextBox("Jargoneer", "", 32, 0);
    mProgressForm = new Form("Lookup progress");
    mProgressString = new StringItem(null, null);

  public void startApp() {
    mDisplay = Display.getDisplay(this);

  public void pauseApp() {}

  public void destroyApp(boolean unconditional) {}

  public void commandAction(Command c, Displayable s) {
    if (c == mExitCommand) {
    else if (c == mFindCommand) {
      // Show the progress form.
      // Kick off the thread to do the query.
      Thread t = new Thread(this);

  public void run() {
    String word = mSubmitBox.getString();
    String definition;
    try { definition = lookUp(word); }
    catch (IOException ioe) {
      Alert report = new Alert(
          "Something went wrong and that " +
          "definition could not be retrieved.",
          null, null);
      mDisplay.setCurrent(report, mSubmitBox);
    Alert results = new Alert("Definition", definition,
        null, null);
    mDisplay.setCurrent(results, mSubmitBox);
  private String lookUp(String word) throws IOException {
    HttpConnection hc = null;
    InputStream in = null;
    String definition = null;
    try {
      String baseURL = "";
      // Take a stab at parameter encoding, ' ' -> '+'.
      String url = baseURL + word.replace(' ', '+');
      hc = (HttpConnection)Connector.open(url);
      hc.setRequestProperty("Connection", "close");
      in = hc.openInputStream();
      int contentLength = (int)hc.getLength();
      if (contentLength == -1) contentLength = 255;
      byte[] raw = new byte[contentLength];
      int length = in.read(raw);

      // Clean up.

      definition = new String(raw, 0, length);
    finally {
      try {
        if (in != null) in.close();
        if (hc != null) hc.close();
      catch (IOException ignored) {}
    return definition;


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.Post MIDlet
15.Patchy MIDletPatchy 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
33.Datagram Receiver