HttpMIDlet.java Source code

Introduction

Here is the source code for HttpMIDlet.java

Source

import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class HttpMIDlet extends MIDlet implements CommandListener, Runnable {
    private Display display;
    private Form addressForm = new Form("HTTP Client");
    private Form connectForm = new Form("Connecting");
    private Form displayForm = new Form("Server Reply");
    private TextField serverURL = new TextField("URL:", "", 256, TextField.ANY);
    private StringItem messageLabel = new StringItem(null, "Connecting...\nPlease wait.");
    private Command okCommand = new Command("OK", Command.OK, 0);
    private Command exitCommand = new Command("Exit", Command.EXIT, 0);
    private Command backCommand = new Command("Back", Command.BACK, 0);

    protected void startApp() throws MIDletStateChangeException {
        display = Display.getDisplay(this);
        addressForm.append(serverURL);
        addressForm.addCommand(okCommand);
        addressForm.addCommand(exitCommand);
        addressForm.setCommandListener(this);
        connectForm.append(messageLabel);
        connectForm.addCommand(backCommand);
        connectForm.setCommandListener(this);
        displayForm.append(messageLabel);
        displayForm.addCommand(backCommand);
        displayForm.setCommandListener(this);
        display.setCurrent(addressForm);
    }

    protected void pauseApp() {
    }

    protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {
    }

    public void commandAction(Command cmd, Displayable d) {
        if (cmd == okCommand) {
            Thread t = new Thread(this);
            t.start();
            display.setCurrent(connectForm);
        } else if (cmd == backCommand) {
            display.setCurrent(addressForm);
        } else if (cmd == exitCommand) {
            try {
                destroyApp(true);
            } catch (MIDletStateChangeException ex) {
            }
            notifyDestroyed();
        }
    }

    public void run() {
        InputStream is = null;
        HttpConnection conn = null;
        try {
            String url = serverURL.getString();
            if (!url.startsWith("http://") && !url.startsWith("https://")) {
                url = "http://" + url;
            }
            conn = (HttpConnection) Connector.open(url, Connector.READ_WRITE);
            if (conn.getResponseCode() == HttpConnection.HTTP_OK) {
                is = conn.openInputStream();
                final int MAX_LENGTH = 128;
                byte[] buf = new byte[MAX_LENGTH];
                int total = 0;
                while (total < MAX_LENGTH) {
                    int count = is.read(buf, total, MAX_LENGTH - total);
                    if (count < 0) {
                        break;
                    }
                    total += count;
                }
                is.close();
                String reply = new String(buf, 0, total);
                messageLabel.setText(reply);
            } else {
                messageLabel.setText("Failed: error " + conn.getResponseCode() + "\n" + conn.getResponseMessage());
            }
            conn.close();
            display.setCurrent(displayForm);
        } catch (IOException ex) {
            System.out.println(ex);
            ex.printStackTrace();
            Alert alert = new Alert("I/O Error", "An error occurred while communicating with the server.", null,
                    AlertType.ERROR);
            alert.setTimeout(Alert.FOREVER);
            display.setCurrent(alert, addressForm);
            return;
        }
    }
}