用Java实现屏幕截图.docx

package com.qiu.util; import java.io.*; import .*; 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(); ); 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; /*捕获全屏慕*/ public Icon captureFullScreen() fullScreenImage = robot.createScreenCapture(new Rectangle( Toolkit.getDefaultToolkit().getScreenSize(); ImageIcon icon = new ImageIcon(fullScreenImage); return icon; /*捕获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); /*得到捕获后的BufferedImage*/ public BufferedImage getPickedImage() return pickedImage; /*得到捕获后的Icon*/ public ImageIcon getPickedIcon() return new ImageIcon(getPickedImage(); /*储存为一个文档,为PNG格式 *deprecated *replaced by saveAsPNG(File file) */ Deprecated public void saveToFile(File file) throws IOException ImageIO.write(getPickedImage(),defaultImageFormater,file); /*储存为一个文档,为PNG格式*/ public void saveAsPNG(File file) throws IOException ImageIO.write(getPickedImage(),png,file); /*储存为一个JPEG格式图像文档*/ 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