imagegetter.java

手机和linux服务器之间图片传输

package getimagefromnet;

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.*;
import java.io.*;
import javax.microedition.io.*;

class ImageGetter extends MIDlet implements CommandListener
{

    private Display display;
    public static final Command connCommand = new Command("Connect",
            Command.ITEM, 1);
    public static final Command exitCommand = new Command("Exit", Command.EXIT,
            1);
    private Form mainForm;
    private GetterThread gt;

    protected void startApp() throws MIDletStateChangeException
    {

        display = Display.getDisplay(this);
        mainForm = new Form("Image Getter");
        mainForm.append("Click Connect to get Image");
        mainForm.addCommand(connCommand);
        mainForm.addCommand(exitCommand);
        mainForm.setCommandListener(this);
        display.setCurrent(mainForm);
        gt = new GetterThread(this);
        gt.start();

    }

    public void setImage(Image image)
    {

        mainForm.append(image);
        display.setCurrent(mainForm);
    }

    protected void pauseApp()
    {

    }

    protected void destroyApp(boolean arg0) throws MIDletStateChangeException
    {

    }

    public void commandAction(Command cmd, Displayable disp)
    {
        if (cmd == connCommand)
        {
            synchronized (this)
            {
                notify();
            }
        } else if (cmd == exitCommand)
        {
            exitMIDlet();
        }
    }

    private void exitMIDlet()
    {
        try
        {
            destroyApp(false);
            notifyDestroyed();
        } catch (MIDletStateChangeException e)
        {
            e.printStackTrace();
        }
    }

    class GetterThread extends Thread
    {
        private ImageGetter midlet;
        public static final String URL = "http://localhost/j2medev.png";
        private HttpConnection httpConn = null;
        private InputStream is = null;

        public GetterThread(ImageGetter midlet)
        {
            this.midlet = midlet;
        }

        public void run()
        {
            synchronized (midlet)
            {
                try
                {
                    midlet.wait();
                } catch (InterruptedException e)
                {
                    e.printStackTrace();
                }
            }
            System.out.println("connect to server...");
            try
            {
                httpConn = (HttpConnection) Connector.open(URL);
                is = httpConn.openInputStream();
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                int ch = 0;
                while ((ch = is.read()) != -1)
                {
                    baos.write(ch);
                }
                byte[] imageData = baos.toByteArray();
                Image image = Image.createImage(imageData, 0, imageData.length);
                midlet.setImage(image);
                baos.close();
                is.close();
                httpConn.close();

            } catch (IOException e)
            {
                e.printStackTrace();
            }

        }
    }

}