隨筆檔案(496)

/* 主要使用的是java.util.Robot類來捕獲屏幕,
* 可以實現對屏幕一個矩形區域的捕獲,通過這個類,
* 我們也可以實現一個遠程桌面控制的程序
*/

package com.qiu.util;
import java.io.*;
import java.net.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.io.*;

public class ScreenCapture {
//test main
public static void main(String[] args) throws Exception{
?? String userdir = System.getProperty("user.dir");
?? File tempFile = new File("d:","temp.png");
?? ScreenCapture capture = ScreenCapture.getInstance();
?? capture.captureImage();??
?? JFrame frame = new JFrame();
?? JPanel panel = new JPanel();
?? panel.setLayout(new BorderLayout());
?? JLabel imagebox = new JLabel();
?? panel.add(BorderLayout.CENTER,imagebox);??
?? imagebox.setIcon(capture.getPickedIcon());
?? capture.saveToFile(tempFile);
?? capture.captureImage();
?? imagebox.setIcon(capture.getPickedIcon());
?? frame.setContentPane(panel);
?? frame.setSize(400,300);
?? frame.show();
?? System.out.println("Over");
}

private ScreenCapture() {
??
?? try{
??? robot = new Robot();
?? }
?? catch(AWTException e) {
??? System.err.println("Internal Error: " + e);
??? e.printStackTrace();
?? }??
?? JPanel cp = (JPanel)dialog.getContentPane();
?? cp.setLayout(new BorderLayout());??
?? labFullScreenImage.addMouseListener(new MouseAdapter() {
???? public void mouseReleased(MouseEvent evn) {
?????? isFirstPoint = true;
?????? pickedImage = fullScreenImage.getSubimage(recX,recY,recW,recH);
?????? dialog.setVisible(false);?????
???? }
??? });
???
?? labFullScreenImage.addMouseMotionListener(new MouseMotionAdapter() {
???? public void mouseDragged(MouseEvent evn) {
????? if(isFirstPoint) {
?????? x1 = evn.getX();
?????? y1 = evn.getY();
?????? isFirstPoint = false;??
????? }
????? else {
?????? x2 = evn.getX();
?????? y2 = evn.getY();
?????? int maxX = Math.max(x1,x2);
?????? int maxY = Math.max(y1,y2);
?????? int minX = Math.min(x1,x2);
?????? int minY = Math.min(y1,y2);
?????? recX = minX;
?????? recY = minY;
?????? recW = maxX-minX;
?????? recH = maxY-minY;
?????? labFullScreenImage.drawRectangle(recX,recY,recW,recH);????
????? }
???? }
????
???? public void mouseMoved(MouseEvent e) {
????? labFullScreenImage.drawCross(e.getX(),e.getY());
???? }
??? });
???
?? cp.add(BorderLayout.CENTER,labFullScreenImage);
?? dialog.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
?? dialog.setAlwaysOnTop(true);
?? dialog.setMaximumSize(
??? Toolkit.getDefaultToolkit().getScreenSize());
?? dialog.setUndecorated(true);
?? dialog.setSize(dialog.getMaximumSize());
?? dialog.setModal(true);
}
//Singleton Pattern
public static ScreenCapture getInstance() {
?? return defaultCapturer;
}
/**捕捉全屏慕*/
public Icon captureFullScreen() {
?? fullScreenImage = robot.createScreenCapture(new Rectangle(
??? Toolkit.getDefaultToolkit().getScreenSize()));
?? ImageIcon icon = new ImageIcon(fullScreenImage);
?? return icon;
}
/**捕捉屏幕的一個矯形區域
?? */
public void captureImage() {
?? fullScreenImage = robot.createScreenCapture(new Rectangle(
??? Toolkit.getDefaultToolkit().getScreenSize()));
?? ImageIcon icon = new ImageIcon(fullScreenImage);
?? labFullScreenImage.setIcon(icon);??
?? dialog.setVisible(true);
}
/**得到捕捉后的BufferedImage*/
public BufferedImage getPickedImage() {
?? return pickedImage;
}
/**得到捕捉后的Icon*/
public ImageIcon getPickedIcon() {
?? return new ImageIcon(getPickedImage());
}
/**儲存為一個文件,為PNG格式
??*@deprecated
?? *replaced by saveAsPNG(File file)
?? **/
@Deprecated
public void saveToFile(File file) throws IOException{
?? ImageIO.write(getPickedImage(),defaultImageFormater,file);
}
/**儲存為一個文件,為PNG格式*/
public void saveAsPNG(File file) throws IOException {
?? ImageIO.write(getPickedImage(),"png",file);
}
/**儲存為一個JPEG格式圖像文件*/
public void saveAsJPEG(File file) throws IOException {
?? ImageIO.write(getPickedImage(),"JPEG",file);
}

/**寫入一個OutputStream*/
public void write(OutputStream out) throws IOException{
?? ImageIO.write(getPickedImage(),defaultImageFormater,out);
}

//singleton design pattern
private static ScreenCapture defaultCapturer = new ScreenCapture();
private int x1,y1,x2,y2;
private int recX,recY,recH,recW; //截取的圖像
private boolean isFirstPoint?? = true;
private BackgroundImage labFullScreenImage = new BackgroundImage();
private Robot robot;
private BufferedImage fullScreenImage;
private BufferedImage pickedImage;
private String defaultImageFormater = "png";
private JDialog dialog = new JDialog();
}

/**顯示圖片的Label*/
class BackgroundImage extends JLabel{
public void paintComponent(Graphics g) {
?? super.paintComponent(g);
?? g.drawRect(x,y,w,h);
?? String area = Integer.toString(w)+" * "+ Integer.toString(h);
?? g.drawString(area,x+(int)w/2-15,y+(int)h/2);
?? g.drawLine(lineX,0,lineX,getHeight());
?? g.drawLine(0,lineY,getWidth(),lineY);
}

public void drawRectangle(int x,int y,int width,int height) {
?? this.x = x;
?? this.y = y;
?? h = height;
?? w = width;
?? repaint();
}

public void drawCross(int x,int y) {
?? lineX = x;
?? lineY = y;
?? repaint();
}

int lineX,lineY;
int x,y,h,w;
}