原贴发表在我的个人博客haha.tk | Ha?Have a Talk!上，转载请注明出处，谢谢。

一切都源于这个表情，后面这个表情就以不可预料的情况演化了。那时想着做一个能加苍蝇的截图工具，程序是用JAVA实现的，项目托管在GitHub https://github.com/Bigcaitou/HEHEHEScreenshot

talk is cheap, show you the code.

截取屏幕

    public RectD() {snapshot();setVisible(true);// setSize(d);//最大化窗口//用 JDialog 做一个无控制条的窗口，大小设置成满屏，把截取的这个满屏的图片贴到这个 JDiaglog 里setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.addMouseListener(new MouseAdapter() {// 得到鼠标箭头初始坐标@Overridepublic void mousePressed(MouseEvent e) {orgx = e.getX();orgy = e.getY();}});//鼠标圈定区域， 对圈定的区域截屏this.addMouseMotionListener(new MouseMotionAdapter() {@Overridepublic 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0g.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);}});//双击鼠标截图this.addMouseListener(new MouseAdapter() {@Overridepublic void mousePressed(MouseEvent e) {int clickTimes = e.getClickCount();if (clickTimes == 2) {saveToFile();}}});}

        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();}}

利用Robot的createScreenCapture可以截图，但是有个问题是遇到多个屏幕，这个方法只能在默认屏幕截图。

添加苍蝇

public static void markImageByIcon(String iconPath, String srcImgPath, String targerPath, Integer degree) {OutputStream os = null;try {Image srcImg = ImageIO.read(new File(srcImgPath));BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null), srcImg.getHeight(null),BufferedImage.TYPE_INT_RGB);// 得到画笔对象Graphics2D g = buffImg.createGraphics();// 设置对线段的锯齿状边缘处理g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);g.drawImage(srcImg.getScaledInstance(srcImg.getWidth(null), srcImg.getHeight(null), Image.SCALE_SMOOTH), 0,0, null);if (null != degree) {// 设置水印旋转g.rotate(Math.toRadians(degree), (double) buffImg.getWidth() / 2, (double) buffImg.getHeight() / 2);}// 水印图象的路径 水印一般为gif或者png的，这样可设置透明度ImageIcon imgIcon = new ImageIcon(iconPath);// ImageIcon imgIcon = new ImageIcon(iconPath);// 得到Image对象。Image img = imgIcon.getImage();float alpha = 1f;// 透明度g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));// 表示水印图片的位置g.drawImage(img, 50, 50, null);g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));g.dispose();os = new FileOutputStream(targerPath);// 生成图片ImageIO.write(buffImg, "PNG", os);setClipboardImage(buffImg);} catch (Exception e) {e.printStackTrace();} finally {try {if (null != os)os.close();} catch (Exception e) {e.printStackTrace();}}}

苍蝇的大小要合适，太大的话太假，太小的话素材太难抠了，最后苍蝇素材是从一个苍蝇画刷工具而来的，我还找了会PS的同学帮我画上苍蝇腿。

截图复制到剪贴板

    public static void setClipboardImage(final Image image) {Transferable trans = new Transferable() {public DataFlavor[] getTransferDataFlavors() {return new DataFlavor[] { DataFlavor.imageFlavor };}public boolean isDataFlavorSupported(DataFlavor flavor) {return DataFlavor.imageFlavor.equals(flavor);}public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {if (isDataFlavorSupported(flavor))return image;throw new UnsupportedFlavorException(flavor);}};Toolkit.getDefaultToolkit().getSystemClipboard().setContents(trans, null);}

系统托盘

public static class SystemTrayDemo extends JFrame {private static final long serialVersionUID = 1L;private TrayIcon trayIcon = null;public SystemTrayDemo() {if (SystemTray.isSupported()) {// 检查当前系统是否支持系统托盘SystemTray tray = SystemTray.getSystemTray();// 获取表示桌面托盘区的SystemTray实例。Image image = this.getToolkit().getImage(this.getClass().getResource("/image/logo.png"));PopupMenu popupMenu = new PopupMenu();MenuItem exitItem = new MenuItem("退出");MenuItem menuItema = new MenuItem("截图");exitItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try {System.exit(0);} catch (Exception ex) {ex.printStackTrace();}}});popupMenu.add(menuItema);popupMenu.add(exitItem);trayIcon = new TrayIcon(image, "呵呵呵截图", popupMenu);while (flag) {flag = false;menuItema.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {// 这里调用截图功能RectD rd = new RectD();GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();gd.setFullScreenWindow(rd);}});try {tray.add(trayIcon);// 将 TrayIcon 添加到 SystemTray。} catch (AWTException e) {System.err.println(e);}}} else {System.out.println("你的系统不支持系统托盘");}try {} catch (Exception e) {}}}

可能会遇到托盘乱码，可以参考 《java软件托盘MenuItem 显示中文出现框框乱码、读取ini配置文件乱码》 ，来解决问题。

保存图片

        public void saveToFile() {SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss_");String name = sdf.format(new Date());File path = FileSystemView.getFileSystemView().getHomeDirectory();// 图片保存在桌面String format = "png";File f = new File(path + File.separator + name + "." + format);try {ImageIO.write(saveImage, format, f);String srcImgPath = path + "\\" + name + ".png";String iconPath = System.getProperty("user.dir") + "\\1.png";// URL iconPath = this.getClass().getResource("/image/1.png");String targerPath = path + "\\" + name + "呵呵呵.png";this.dispose();//给图片添加水印HEHEHEScreenshot.markImageByIcon(iconPath, srcImgPath, targerPath, null);} catch (IOException e) {e.printStackTrace();}}

效果图如下所示：

相关链接

|相关链接 | |:-------------:| | 苍蝇画刷工具下载 | | 项目主页 | | java 截图源码 | | Java实现给图片添加水印 | | java软件托盘MenuItem 显示中文出现框框乱码、读取ini配置文件乱码 |

下次再讲

• jar的运行
• jar→exe
• jre精简
• 跨平台优化