java截屏简单例子，java截屏,java截屏 运行后将当

java截屏简单例子，java截屏,java截屏 运行后将当

java截屏 运行后将当前屏幕截取，并最大化显示。 拖拽鼠标，选择自己需要的部分。 按Esc键保存图片到桌面，并退出程序。 点击右上角（没有可见的按钮），退出程序，不保存图片。```javaimport java.awt.AWTException;import java.awt.Color;import java.awt.Dimension;import java.awt.Graphics;import java.awt.GraphicsDevice;import java.awt.GraphicsEnvironment;import java.awt.Rectangle;import java.awt.Robot;import java.awt.Toolkit;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseMotionAdapter;import java.awt.image.BufferedImage;import java.awt.image.RescaleOp;import java.io.File;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;

import javax.imageio.ImageIO;import javax.swing.JFrame;import javax.swing.filechooser.FileSystemView;

/* * java截屏 * 运行后将当前屏幕截取，并最大化显示。 * 拖拽鼠标，选择自己需要的部分。 * 按Esc键保存图片到桌面，并退出程序。 * 点击右上角（没有可见的按钮），退出程序，不保存图片。 * * @author JinCeon /public class SnapshotTest { public static void main(String[] args) { // 全屏运行 RectD rd = new RectD(); GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment() .getDefaultScreenDevice(); gd.setFullScreenWindow(rd); }}

class RectD extends JFrame { private static final long serialVersionUID = 1L; int orgx, orgy, endx, endy; Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); BufferedImage image; BufferedImage tempImage; BufferedImage saveImage; Graphics g;

@Overridepublic void paint(Graphics g) {    RescaleOp ro = new RescaleOp(0.8f, 0, null);    tempImage = ro.filter(image, null);    g.drawImage(tempImage, 0, 0, this);}public RectD() {    snapshot();    setVisible(true);    // setSize(d);//最大化窗口    setDefaultCloseOperation(EXIT_ON_CLOSE);    this.addMouseListener(new MouseAdapter() {        public void mousePressed(MouseEvent e) {            orgx = e.getX();            orgy = e.getY();        }    });    this.addMouseMotionListener(new MouseMotionAdapter() {        public void mouseDragged(MouseEvent e) {            endx = e.getX();            endy = e.getY();            g = getGraphics();            g.drawImage(tempImage, 0, 0, RectD.this);            int x = Math.min(orgx, endx);            int y = Math.min(orgy, endy);            int width = Math.abs(endx - orgx)+1;            int height = Math.abs(endy - orgy)+1;            // 加上1，防止width或height为0            g.setColor(Color.BLUE);            g.drawRect(x-1, y-1, width+1, height+1);            //减1，加1都是为了防止图片将矩形框覆盖掉            saveImage = image.getSubimage(x, y, width, height);            g.drawImage(saveImage, x, y, RectD.this);        }    });    this.addKeyListener(new KeyAdapter() {        @Override        public void keyReleased(KeyEvent e) {            // 按Esc键退出            if (e.getKeyCode() == 27) {                saveToFile();                System.exit(0);            }        }    });}public void saveToFile() {    SimpleDateFormat sdf = new SimpleDateFormat("yyyymmddHHmmss");    String name = sdf.format(new Date());    File path = FileSystemView.getFileSystemView().getHomeDirectory();    String format = "jpg";    File f = new File(path + File.separator + name + "." + format);    try {        ImageIO.write(saveImage, format, f);    } catch (IOException e) {        e.printStackTrace();    }}public void snapshot() {    try {        Robot robot = new Robot();        Dimension d = Toolkit.getDefaultToolkit().getScreenSize();        image = robot.createScreenCapture(new Rectangle(0, 0, d.width,                d.height));    } catch (AWTException e) {        e.printStackTrace();    }}

}```