/* * Copyright (c) 2000-2001 Sun Microsystems, Inc. All Rights Reserved. */package examples.netclient;import java.lang.*;import java.io.*;import java.util.*;import javax.microedition.lcdui.*;import javax.microedition.midlet.*;/** * A simple network client. * * This MIDlet shows a simple use of the HTTP * networking interface. It opens a HTTP POST * connection to a server, authenticates using * HTTP Basic Authentication and writes a string * to the connection. It then reads the * connection and displays the results. */public class NetClientMIDlet extends MIDlet    implements CommandListener {    private Display display;  // handle to the display    private Form mainScr;     // main screen    private Command cmdOK;    // OK command    private Command cmdExit;  // EXIT command    private Form dataScr;     // for display of results    /**     * Constructor.     *     * Create main screen and commands. Main     * screen shows simple instructions.     */    public NetClientMIDlet() {        display = Display.getDisplay(this);        mainScr = new Form("NetClient");        mainScr.append("Hit OK to make network connection");        mainScr.append(" ");        mainScr.append("Hit EXIT to quit");        cmdOK = new Command("OK", Command.OK, 1);        cmdExit = new Command("Exit", Command.EXIT, 1);        mainScr.addCommand(cmdOK);        mainScr.addCommand(cmdExit);        mainScr.setCommandListener(this);    }    /**     * Called by the system to start our MIDlet.     * Set main screen to be displayed.     */    protected void startApp() {        display.setCurrent(mainScr);    }    /**     * Called by the system to pause our MIDlet.     * No actions required by our MIDLet.     */    protected void pauseApp() {}    /**     * Called by the system to end our MIDlet.     * No actions required by our MIDLet.     */    protected void destroyApp(boolean unconditional) {}    /**     * Gets data from server.     *     * Open a connection to the server, set a     * user and password to use, send data, then     * read the data from the server.     */    private void genDataScr() {        ConnectionManager h = new ConnectionManager();        // Set message to send, user, password        h.setMsg("Esse quam videri");        h.setUser("book");        h.setPassword("bkpasswd");        byte[] data = h.Process();        // create data screen        dataScr = new Form("Data Screen");        dataScr.addCommand(cmdOK);        dataScr.addCommand(cmdExit);        dataScr.setCommandListener(this);        if (data == null || data.length == 0) {            // tell user no data was returned            dataScr.append("No Data Returned!");        } else {            // loop trough data and extract strings            // (delimited by '\n' characters            StringBuffer sb = new StringBuffer();            for (int i = 0; i < data.length; i++) {                if (data[i] == (byte)'\n') {                    dataScr.append(sb.toString());                    sb.setLength(0);                } else {                    sb.append((char)data[i]);                }            }        }        display.setCurrent(dataScr);    }    /**     * This method implements a state machine that drives     * the MIDlet from one state (screen) to the next.     */    public void commandAction(Command c,                              Displayable d) {        if (c == cmdOK) {            if (d == mainScr) {                genDataScr();            } else {                display.setCurrent(mainScr);            }        } else if (c == cmdExit) {            destroyApp(false);            notifyDestroyed();        }    }}