java实现摄像头截图功能

package com.pengo.capture;import java.awt.BorderLayout;import java.awt.Dimension;import java.awt.Graphics2D;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;import javax.media.MediaLocator;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;import net.sf.fmj.ui.application.CaptureDeviceBrowser;import net.sf.fmj.ui.application.ContainerPlayer;import net.sf.fmj.ui.application.PlayerPanelPrefs;public class CameraFrame extends JFrame{  private static int num = 0;  public CameraFrame() throws Exception{    this.setTitle("摄像头截图应用");    this.setSize(480, 500);    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    final JPanel cameraPanel = new JPanel();    this.getContentPane().setLayout(new BorderLayout());    this.getContentPane().add(cameraPanel, BorderLayout.CENTER);    ContainerPlayer containerPlayer = new ContainerPlayer(cameraPanel);    MediaLocator locator = CaptureDeviceBrowser.run(null);  //弹出摄像头设备选择    //    MediaLocator locator = null;//    GlobalCaptureDevicePlugger.addCaptureDevices();//    Vector vectorDevices = CaptureDeviceManager.getDeviceList(null);//    if (vectorDevices == null || vectorDevices.size() == 0)//    {//      System.out.println("没有摄像头===");//      return;//    }//    //选择第一个摄像头设备//    for ( int i = 0; i < vectorDevices.size(); i++ ) //    {//      CaptureDeviceInfo infoCaptureDevice = (CaptureDeviceInfo) vectorDevices.get(i);//      System.out.println("设备名===============" + infoCaptureDevice.getName());//      //选择第一个设备为程序使用,如果存在多个设备时，则第一个可能不是摄像头//      locator = infoCaptureDevice.getLocator();//      break;//    }    PlayerPanelPrefs prefs = new PlayerPanelPrefs();    containerPlayer.setMediaLocation(locator.toExternalForm(), prefs.autoPlay);        JPanel btnPanel = new JPanel(new BorderLayout());    final JTextField path = new JTextField("E://camera");    path.setColumns(30);    btnPanel.add(path, BorderLayout.WEST);    JButton okBtn = new JButton("截图");    okBtn.addActionListener(new ActionListener(){       public void actionPerformed(ActionEvent e){         Dimension imageSize = cameraPanel.getSize();          BufferedImage image = new BufferedImage(imageSize.width,              imageSize.height, BufferedImage.TYPE_INT_ARGB);          Graphics2D g = image.createGraphics();          cameraPanel.paint(g);          g.dispose();          try {                    String filePath = path.getText();            File file = new File(filePath);            if(file.exists() == false){              file.mkdirs();            }            ImageIO.write(image, "png", new File(file.getAbsolutePath() + "/" + num + ".png"));            num++;          } catch (IOException ex) {            ex.printStackTrace();                      }       }    });    btnPanel.add(okBtn, BorderLayout.EAST);    this.getContentPane().add(btnPanel, BorderLayout.SOUTH);  }    public static void main(String[] args) throws Exception{    CameraFrame camera = new CameraFrame();    camera.setVisible(true);  }}