Java实现简单的屏幕抓图

TestSort.java

 

package cn.gyzt.testsort;/** * Java递归实现折中算法 * @author 漆艾林 * @param <O> */public class TestSort<O extends Comparable<O>> {private O[] data;public TestSort(O[] data){this.data = data;}/*** 递归折中算法*/public int sortByReturn(int low, int high, O value){int mid = (low+high)/2;if(value.compareTo(data[mid])<0){high = mid -1;return sortByReturn(low,high,value);}else if(value.compareTo(data[mid])>0){low = mid + 1;return sortByReturn(low,high,value);}else{return mid;}}/*** 循环折中算法* @param args*/public int sortByWhile(O value){if(value==null){return 0;}int low = 0;int high = data.length-1;int mid ;while(low<=high){mid = (high+low)/2;if(value.compareTo(data[mid])<0){high = mid-1;}else if(value.compareTo(data[mid])>0){low = mid+1;}else if(value.compareTo(data[mid])==0){return mid;}}return -1;}public static void main(String[] args){Integer data[] = {1,2,5,7,9,33,43,45,66,78,93,67};TestSort<Integer> ts = new TestSort<Integer>(data);System.out.println("sort by while:"+ts.sortByWhile(5));System.out.println("sort2 by while:"+ts.sortByReturn(0,data.length-1,33));}}

 

ScreenCapture.java

 

package cn.gyzt.screencapture;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 漆艾林 一个简单的屏幕抓图 * 2011年1月21日 17:06:44 **/public class ScreenCapture {// test mainpublic 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 Patternpublic 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) **/@Deprecatedpublic 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 patternprivate 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;}