java操作摄像头截图

本来sun有个jmf组件可以很方便的实现摄像头截图的，不过这版本后来停止更新了，当前官网最新版本为Java Media Framework (JMF) 2.1.1e，下载回来，在windows 7 32位上使用，居然不能运行，网上另外找了个fmj的替代框架jmf使用，下载地址：http://fmj-sf.net/downloads.php  资源在附件中

注意根据不同的平台要在Java加载的路径下放入链接库，例如Windows 要在Java的安装bin目录下 放入native\win32-x86 的链接库。最后把附近中的jar都加入classpath中。

截图实现代码：

package com.lifeiflong.swing;

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(880, 680);
        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);
    }
}