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);
  }
}