树结构图
TOP 10
  • 相关软件
    >一个简单的用JAVA实现的屏幕抓图(源代码)　创建者：webmaster　更新时间：2005-05-31 11:34

    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());
      }
      });
     
    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;
    }    相关文章
    本页查看次数: