package com.enterprisej2me.simpledemo;import java.io.*;import javax.microedition.midlet.*;import javax.microedition.lcdui.*;import javax.microedition.rms.*;import javax.microedition.io.*;public class DemoMIDlet extends MIDlet                implements CommandListener {  private Display display;  private Command fetch;  private Command history;  private Command erase;  private Command exit;  private Command done;  private TextField urlField;  private RecordStore store;  public DemoMIDlet () throws Exception {    display = Display.getDisplay(this);    fetch = new Command("FETCH", Command.SCREEN, 1);    history = new Command("HISTORY", Command.SCREEN, 1);    erase = new Command("ERASE", Command.SCREEN, 1);    exit  = new Command("EXIT", Command.CANCEL, 1);    done  = new Command("DONE", Command.CANCEL, 1);    store = RecordStore.openRecordStore("DataStore", true);  }  public void startApp() {    startScreen ();  }  public void pauseApp() {    // Nothing to do ...  }  public void destroyApp(boolean unconditional) {    try {      store.closeRecordStore ();    } catch (Exception exp) {      exp.printStackTrace ();    }  }  public void commandAction(Command command,                            Displayable screen) {    if (command == exit) {      destroyApp(false);      notifyDestroyed();    } else if (command == fetch) {      FetchWorker t = new FetchWorker ();      t.setListener(this);      t.start();    } else if (command == history) {      HistoryWorker t = new HistoryWorker ();      t.setListener(this);      t.start();    } else if (command == erase) {      try {        store.closeRecordStore ();        RecordStore.deleteRecordStore("DataStore");        store = RecordStore.openRecordStore("DataStore", true);      } catch (Exception exp) { }      HistoryWorker t = new HistoryWorker ();      t.setListener(this);      t.start();    } else if (command == done) {      startScreen();    }  }  private void startScreen () {    Form f = new Form ("Get content");    urlField = new TextField ("URL: ", "", 30, TextField.ANY);    f.append (urlField);    f.addCommand (fetch);    f.addCommand (exit);    f.setCommandListener(this);    display.setCurrent(f);  }  class FetchWorker extends Thread {    private CommandListener listener;    public void setListener (CommandListener cl) {      listener = cl;    }    public void run () {      HttpConnection conn = null;      DataInputStream din = null;      ByteArrayOutputStream bos = null;      try {        // Get the url        String url = urlField.getString ();        // Fetch the remote content to a byte array "buf"        conn = (HttpConnection) Connector.open(url);        conn.setRequestMethod(HttpConnection.GET);        din = conn.openDataInputStream();        bos = new ByteArrayOutputStream();        byte[] buf = new byte[256];        while (true) {          int rd = din.read(buf, 0, 256);          if (rd == -1) break;          bos.write(buf, 0, rd);        }        bos.flush();        buf = bos.toByteArray();        // Save the history        store.addRecord(url.getBytes(), 0, url.getBytes().length);        // Display a new screen        Form f = new Form ("content");        f.append(url + "\n");        f.append(new String(buf));        f.addCommand(history);        f.addCommand(done);        f.setCommandListener (listener);        display.setCurrent(f);      } catch (Exception exp) {        exp.printStackTrace();      } finally {        try {          if (din != null) din.close();          if (conn != null) conn.close();          if (bos != null) bos.close();        } catch (Exception exp) {}      }    }  }  class HistoryWorker extends Thread {    private CommandListener listener;    public void setListener (CommandListener cl) {      listener = cl;    }    public void run () {      try {        Form f = new Form ("History");        RecordEnumeration enu =                store.enumerateRecords(null, null, false);        for (; enu.hasNextElement() ;) {          byte [] data = enu.nextRecord();          f.append((new String(data)) + "\n");        }        enu.destroy();        f.addCommand(erase);        f.addCommand(done);        f.setCommandListener (listener);        display.setCurrent(f);      } catch (Exception exp) {        exp.printStackTrace();      }    }  }}