Load image from a URL : Connector « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. Connector

import java.io.DataInputStream;
import java.io.IOException;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
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.Image;
import javax.microedition.lcdui.ImageItem;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;

public class HttpMIDlet extends MIDlet implements CommandListener {
  private Command exitCommand = new Command("Exit", Command.EXIT, 1);

  private Command sendCommand = new Command("Send", Command.OK, 1);

  private Command backCommand = new Command("Upload", Command.OK, 1);

  private Display display;

  private String URL = "http://localhost/Java.png";

  private Form mainForm, resultForm;

  private Item mItem;

  private TextField URLField = new TextField(null, URL, 250, TextField.URL);

  public HttpMIDlet() {
    display = Display.getDisplay(this);
  }
  public void startApp() {
    mainForm = new Form("Address");
    mainForm.append(URLField);
    mainForm.addCommand(sendCommand);
    mainForm.addCommand(exitCommand);
    mainForm.setCommandListener(this);
    display.setCurrent(mainForm);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction(Command c, Displayable s) {
    if (c == sendCommand) {
      resultForm = new Form("Image");
      String URLString = URLField.getString();
      try {
        Image image = loadImage(URLString);
        mItem = new ImageItem(null, image, 0, null);
      } catch (IOException ioe) {
        mItem = new StringItem(null, ioe.toString());
      }
      resultForm.append(mItem);
      resultForm.addCommand(backCommand);
      resultForm.setCommandListener(this);
      display.setCurrent(resultForm);
    } else if (c == backCommand) {
      URLField.setString(URL);
      display.setCurrent(mainForm);
    } else {
      destroyApp(false);
      notifyDestroyed();
    }
  }

  public Image loadImage(String url) throws IOException {
    HttpConnection hpc = null;
    DataInputStream dis = null;
    try {
      hpc = (HttpConnection) Connector.open(url);
      int length = (int) hpc.getLength();
      byte[] data = new byte[length];
      dis = new DataInputStream(hpc.openInputStream());
      dis.readFully(data);
      return Image.createImage(data, 0, data.length);
    } finally {
      if (hpc != null)
        hpc.close();
      if (dis != null)
        dis.close();
    }
  }
}