jmf 照相机程序

自己学习jmf,编写了一个照相机程序。将源代码发上来。希望高手给予指点，有些地方不太懂

package MyCamera;

import javax.swing.JFrame;
import javax.swing.JPanel;
/**
 * 主面板类
 * @author liunian
 *
 */
public class MyCamera extends JFrame{
	
	private JPanel pnlMain;//主面板放置操作面板和镜头面板
	private OperatePanel pnlOperate;//操作面板
	private ScenePanel pnlScene;//镜头面板
	
	public MyCamera() {
		pnlMain = (JPanel) this.getContentPane();
	    pnlScene = new ScenePanel();
		pnlOperate = new OperatePanel(pnlScene);
	    initMain();
		init();
	}
	//初始化主面板
	public void initMain() {
		pnlMain.setLayout(null);
		pnlOperate.setBounds(0, 0, 100, 400);
		pnlMain.add(pnlOperate);
		pnlScene.setBounds(100, 0, 400, 400);
		pnlMain.add(pnlScene);
	}
	
	public void init() {
		this.pack();
		this.setSize(500, 400);
		this.setTitle("我的相机");
		//this.setResizable(false);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		this.setLocationRelativeTo(null);
		this.setVisible(true);
	}
	
}

 

package MyCamera;

import java.awt.Graphics;
import java.awt.Image;

import javax.swing.JPanel;

/**
 * 显示抓拍下来照片的面板
 * @author liunian
 *
 */
public class ImagePanel extends JPanel {
	
	private Image image;
	public ImagePanel() {
		init();
	}
	 
	public void init() {
		this.setLayout(null);
		this.setSize(400, 400);
	}
	public void setImage(Image image) {
		this.image = image;
	}

	public void paint(Graphics g) {
		if(image != null) {
			g.drawImage(image, 0, 0, 400, 400, this);
		}
	}
}

 

package MyCamera;

import java.awt.Component;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.media.CannotRealizeException;
import javax.media.Buffer;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.NoPlayerException;
import javax.media.Player;
import javax.media.control.FrameGrabbingControl;
import javax.media.format.VideoFormat;
import javax.media.util.BufferToImage;

import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
 * 各种方法的DAO类
 * @author Administrator
 *
 */
public class OperateDAO {

	//private CaptureDeviceInfo captureDeviceInfo;
	private MediaLocator mediaLocator;
	private static Player player;
	private Buffer buffer;
	private BufferToImage bufferToImage;
	private Image image;
	
	//初始化设备
	public Component initCamera(String deviceName, String deviceLocation) {

		Component comp = null;
		// 获得设备信息
		//captureDeviceInfo = CaptureDeviceManager.getDevice(deviceName);
		mediaLocator = new MediaLocator(deviceLocation);// 此类描述媒体目录的地址????
		try {
			player = Manager.createRealizedPlayer(mediaLocator);
			comp = player.getVisualComponent();
		} catch (NoPlayerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (CannotRealizeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return comp;
	}
	
	//打开设备
	public void openCamera() {
		if(player != null) {
			player.start();
		}
	}
	//关闭设备
	public void closeCamera() {
		if(player!=null) {
			player.close();
		}
	}

	//照相
	public Image photo() {
		FrameGrabbingControl fgc = (FrameGrabbingControl) player
			.getControl("javax.media.control.FrameGrabbingControl");
		buffer = fgc.grabFrame();
		bufferToImage = new BufferToImage((VideoFormat) buffer.getFormat());
		image = bufferToImage.createImage(buffer);
System.out.println("照相完毕");
		return image;
	}

	//保存照片(未初步理解)
	public void savePhoto(Image image, String path) {
		
		BufferedImage bi = new BufferedImage(image.getWidth(null), image
				.getHeight(null), BufferedImage.TYPE_INT_RGB);
		//这两句话必须加否则输出的图片无法正确显示
		Graphics2D g2 = bi.createGraphics();
		g2.drawImage(image, null, null);
		
		FileOutputStream fos = null;
		try {
			fos = new FileOutputStream(path);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		//JPEGCodec.createJPEGEncoder的作用是创建一个和指定输出流关联的JPEGImageEncoder对象
		JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(fos);
		//封装了所有的关于jpeg的参数
		JPEGEncodeParam jpegParam = jpegEncoder.getDefaultJPEGEncodeParam(bi);
		//quality取值在 1.0 到 0.0 之间Some guidelines: (0.75 high quality)  (0.5  medium quality)  (0.25 low quality) (1f不压缩图像)
		jpegParam.setQuality(1f, false);
		jpegEncoder.setJPEGEncodeParam(jpegParam);
		
		try {
			jpegEncoder.encode(bi);
			if(fos!=null) {
				fos.close();
			}
		} catch (ImageFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}	
}

 

package MyCamera;

import java.awt.Color;
import java.awt.Component;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.filechooser.FileFilter;
/**
 * 操作面板
 * @author liunian
 *
 */
public class OperatePanel extends JPanel {
	
	private JButton btnClose;
	private JButton btnPhoto;
	private JButton btnRePhoto;
	private JButton btnSave;
	private JButton btnDel;
	private ScenePanel pnlScene;
	private OperateDAO odao;
	private Image image;
	private Component comp;
	private ImagePanel pnlImage;
	
	public OperatePanel(ScenePanel pnlScene) {
		this.setBackground(Color.blue);
		OperatePanel_btns_ActionListener oba = new OperatePanel_btns_ActionListener(this);
		btnClose = new JButton("关    闭");
		btnClose.addActionListener(oba);
		btnPhoto = new JButton("拍    照");
		btnPhoto.addActionListener(oba);
		btnRePhoto = new JButton("重    拍");
		btnRePhoto.setEnabled(false);
		btnRePhoto.addActionListener(oba);
		btnSave = new JButton("保    存");
		btnSave.setEnabled(false);
		btnSave.addActionListener(oba);
		btnDel =  new JButton("删    除");
		btnDel.setEnabled(false);
		btnDel.addActionListener(oba);
		odao = new OperateDAO();
		pnlImage = new ImagePanel();
		this.pnlScene = pnlScene;
		comp = pnlScene.getCameraCom();
		init();
	}
	
	public void init() {
		
		pnlImage.setBounds(0, 0, 400, 400);
		this.add(btnClose);
		this.add(btnPhoto);
		this.add(btnRePhoto);
		this.add(btnSave);
		this.add(btnDel);
	}
	
	public void btns_actionPerformed(ActionEvent e) {
		if(e.getSource().equals(btnClose)) {
System.out.println("关闭");
			this.close();
		}
		if(e.getSource().equals(btnPhoto)) {
System.out.println("照相");
            image = this.photo();
            btnRePhoto.setEnabled(true);
            btnSave.setEnabled(true);
            btnDel.setEnabled(true);
		}
		if(e.getSource().equals(btnRePhoto)) {
System.out.println("重新照相");
            this.rePhoto();
            btnRePhoto.setEnabled(false);
            btnSave.setEnabled(false);
            btnDel.setEnabled(false);
		}
		if(e.getSource().equals(btnSave)) {
System.out.println("保存");
            this.savePhoto();
		}
		if(e.getSource().equals(btnDel)) {
System.out.println("删除");
            this.delPhoto();
		}
	}
	
	//关闭
	public void close() {
		odao.closeCamera();
		System.exit(0);
	}
	//照相
	public Image photo() {
System.out.println("开始照相");
		Image image = odao.photo();
		if(image!=null) {
			this.showImage(image);
System.out.println("展示相片");
		}
		return image;
	}

	//将捕捉到的相片展示（注意将展示的照片处理大小使其全部显示）
	/*
	 * 待解决的问题  多次拍照会出现照片重叠的现象
	 */

	public void showImage(Image image) {
		
		//将原组件设置为不可见
		comp.setVisible(false);
		//对显示照片的面板做处理
		pnlImage.setImage(image);
		//pnlImage.repaint();
		//将展示的面板设置为可见
		pnlImage.setVisible(true);
		
		//加载到显示区并调用重绘函数
		pnlScene.add(pnlImage);
		pnlScene.repaint();
	}
	//重新照相
	public void rePhoto() {
		image = null;//将原来的清空
		pnlImage.setVisible(false);
		comp.setVisible(true);
	}
	//保存照片
	public void savePhoto() {
		if(image != null) {
			//创建一个文件选择器
			JFileChooser fChooser = new JFileChooser();
			//设置默认打开的目录F:/MyFile/eclipseWorkspace/testCamera/
			fChooser.setCurrentDirectory(new File("photo"));
			//设置保存的文件类型
			JPGFileFilter jpgFilter = new JPGFileFilter();
			fChooser.setFileFilter(jpgFilter);
			
			//方法返回参数表示确定  取消  发生错误
			int result = fChooser.showSaveDialog(this);
			String  photoPath = "";
			if(result == JFileChooser.APPROVE_OPTION) {
				//获得文件的路径包括文件名
				File f = fChooser.getSelectedFile();
				if(f != null) {
					photoPath = f.getAbsolutePath(); 
					String extenName = fChooser.getFileFilter().getDescription();
					extenName = extenName.substring(extenName.indexOf('.'),extenName.indexOf('('));
					if(!photoPath.endsWith(extenName)) {
						photoPath += extenName;
					}
				}
				odao.savePhoto(image,photoPath);
			}
		} 
	}
	//删除照片
	public void delPhoto() {
		
	}
//	public void setPnlScene(ScenePanel pnlScene) {
//		this.pnlScene = pnlScene;
//	}

}

/**
 * 监听按钮的监听器
 * @author liunian
 *
 */
class OperatePanel_btns_ActionListener implements ActionListener {

	private OperatePanel pnlOperate;
	
	public OperatePanel_btns_ActionListener(OperatePanel pnlOperate) {
		this.pnlOperate = pnlOperate;
	}
	public void actionPerformed(ActionEvent e) {
		pnlOperate.btns_actionPerformed(e);
	}
}

/**
 * 重写文件过滤器
 * @author liunian
 * 
 */
class JPGFileFilter extends FileFilter{

	//说明可接受的文件类型
	public boolean accept(File f) {
		String fileName = f.getName();
		return fileName.toLowerCase().endsWith(".jpg");
	}

	//对话框下面的提示字符
	public String getDescription() {
		
		return "*.jpg(图像文件)";
	}
}

 

package MyCamera;

import java.awt.Color;
import java.awt.Component;
//import java.awt.Graphics;
//import java.io.IOException;

//import javax.media.CannotRealizeException;
//import javax.media.CaptureDeviceInfo;
//import javax.media.CaptureDeviceManager;
//import javax.media.Manager;
//import javax.media.MediaLocator;
//import javax.media.NoPlayerException;
//import javax.media.Player;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
/**
 * 照相机面板
 * @author liunian
 *
 */
public class ScenePanel extends JPanel{

	private OperateDAO odao;
	private Component comp;
	
	public ScenePanel() {
		this.setBackground(Color.green);
		odao = new OperateDAO();
		init();
	}
	
	public void init() {
		this.setLayout(null);//注意如果不设空布局 则设尺寸不起作用
		this.setSize(400, 400);
		initCamera();
	}

	public void initCamera() {
		comp = odao.initCamera("vfw:Microsoft WDM Image Capture (Win32):0","vfw://0");
		if(comp != null) {
			comp.setBounds(0, 0, 400, 400);
			this.add(comp);
			odao.openCamera();
System.out.println("设备初始化完成");
		} else {
			JOptionPane.showMessageDialog(null, "请检查您的设备是否在使用中", "提示", JOptionPane.INFORMATION_MESSAGE);
		}
	}
	
	public Component getCameraCom() {
		return comp;
	}
}

 

package MyCamera;

/**
 * 启动类
 * @author liunian
 *
 */
public class Start {
	
	public static void main(String[] args) {
		new MyCamera();
	}
}