Java实例：JAVA实现屏幕抓图

猪哥

主要使用的是java.util.Robot类来捕获屏幕,可以实现对屏幕一个矩形区域的捕获,通过这个类,我们也可以实现一个远程桌面控制的程序。 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.*; /**@Author Qiu_BaiChao *一个简单的屏幕抓图 * **/ 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()); } }); [1] [2] 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; } /**捕捉屏幕的一个矫形区域 */ 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()); } /**储存为一个文件,为PNG格式 *@deprecated *replaced by saveAsPNG(File file) **/ @Deprecated public void saveToFile(File file) throws IOException{ ImageIO.write(getPickedImage(),defaultImageFormater,file); } /**储存为一个文件,为PNG格式*/ public void saveAsPNG(File file) throws IOException { ImageIO.write(getPickedImage(),"png",file); } /**储存为一个JPEG格式图像文件*/ public void saveAsJPEG(File file) throws IOException { ImageIO.write(getPickedImage(),"JPEG",file); } /**写入一个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; //截取的图像 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(); } /**显示图片的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; } 上一页 [1] [2]