//利用这三个类分别获取摄像头驱动，和获取摄像头内的图像流，获取到的图像流是一个Swing的Component组件类

public static Player player = null;

private CaptureDeviceInfo di = null;

private MediaLocator ml = null;

//文档中提供的驱动写法，为何这么写我也不知：）

String str1 = "vfw:Logitech USB Video Camera:0";

        String str2 = "vfw:Microsoft WDM Image Capture (Win32):0";

        di = CaptureDeviceManager.getDevice(str2);

        ml = di.getLocator();

        try

        {

            player = Manager.createRealizedPlayer(ml);

            player.start();

            Component comp;

            if ((comp = player.getVisualComponent()) != null)

            {

                add(comp, BorderLayout.NORTH);

            }

}

        catch (Exception e)

        {

            e.printStackTrace();

        }

private JButton capture;

private Buffer buf = null;

private BufferToImage btoi = null;

private ImagePanel imgpanel = null;

private Image img = null;

private ImagePanel imgpanel = null;

JComponent c = (JComponent) e.getSource();

        if (c == capture)//如果按下的是拍照按钮

        {

            FrameGrabbingControl fgc =

                (FrameGrabbingControl) player.getControl(

                    "javax.media.control.FrameGrabbingControl");

            buf = fgc.grabFrame(); // 获取当前祯并存入Buffer类

            btoi = new BufferToImage((VideoFormat) buf.getFormat());

            img = btoi.createImage(buf); // show the image    

            imgpanel.setImage(img);

        }

BufferedImage bi = (BufferedImage) createImage(imgWidth, imgHeight);

        Graphics2D g2 = bi.createGraphics();

        g2.drawImage(img, null, null);

FileOutputStream out = null;

        try

        {

            out = new FileOutputStream(s);

        }

        catch (java.io.FileNotFoundException io)

        {

            System.out.println("File Not Found");

        }

        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

        JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);

        param.setQuality(1f, false);//不压缩图像

        encoder.setJPEGEncodeParam(param);

        try

        {

            encoder.encode(bi);

            out.close();

        }

        catch (java.io.IOException io)

        {

            System.out.println("IOException");

        }