有没有办法使用Java截取屏幕截图并将其保存为某种图像？

Question

简单如标题所述：您是否只能使用Java命令截取屏幕并保存？或者，我是否需要使用特定于操作系统的程序来截取屏幕截图然后将其从剪贴板中取出？

Answer 1

信不信由你，您实际上可以使用java.awt.Robot来“创建包含从屏幕读取的像素的图像”。然后，您可以将该映像写入磁盘上的文件。

我刚试了一下，整个事情最终结束了：

Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
BufferedImage capture = new Robot().createScreenCapture(screenRect);
ImageIO.write(capture, "bmp", new File(args[0]));

注意：这只会捕获主监视器。有关多显示器支持，请参阅GraphicsConfiguration。

Answer 2

我从不喜欢使用Robot，所以我制作了自己的简单方法来制作JFrame对象的截图：

public static final void makeScreenshot(JFrame argFrame) {
    Rectangle rec = argFrame.getBounds();
    BufferedImage bufferedImage = new BufferedImage(rec.width, rec.height, BufferedImage.TYPE_INT_ARGB);
    argFrame.paint(bufferedImage.getGraphics());

    try {
        // Create temp file
        File temp = File.createTempFile("screenshot", ".png");

        // Use the ImageIO API to write the bufferedImage to a temporary file
        ImageIO.write(bufferedImage, "png", temp);

        // Delete temp file when program exits
        temp.deleteOnExit();
    } catch (IOException ioe) {
        ioe.printStackTrace();
    }
}

Answer 3

如果您想捕获所有监视器，可以使用以下代码：

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] screens = ge.getScreenDevices();

Rectangle allScreenBounds = new Rectangle();
for (GraphicsDevice screen : screens) {
    Rectangle screenBounds = screen.getDefaultConfiguration().getBounds();

    allScreenBounds.width += screenBounds.width;
    allScreenBounds.height = Math.max(allScreenBounds.height, screenBounds.height);
}

Robot robot = new Robot();
BufferedImage screenShot = robot.createScreenCapture(allScreenBounds);

Answer 4

public void captureScreen(String fileName) throws Exception {
   Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
   Rectangle screenRectangle = new Rectangle(screenSize);
   Robot robot = new Robot();
   BufferedImage image = robot.createScreenCapture(screenRectangle);
   ImageIO.write(image, "png", new File(fileName));
}

Answer 5

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File; 
import javax.imageio.ImageIO;
import javax.swing.*;  

public class HelloWorldFrame extends JFrame implements ActionListener {

JButton b;
public HelloWorldFrame() {
    this.setVisible(true);
    this.setLayout(null);
    b = new JButton("Click Here");
    b.setBounds(380, 290, 120, 60);
    b.setBackground(Color.red);
    b.setVisible(true);
    b.addActionListener(this);
    add(b);
    setSize(1000, 700);
}
public void actionPerformed(ActionEvent e)
{
    if (e.getSource() == b) 
    {
        this.dispose();
        try {
            Thread.sleep(1000);
            Toolkit tk = Toolkit.getDefaultToolkit(); 
            Dimension d = tk.getScreenSize();
            Rectangle rec = new Rectangle(0, 0, d.width, d.height);  
            Robot ro = new Robot();
            BufferedImage img = ro.createScreenCapture(rec);
            File f = new File("myimage.jpg");//set appropriate path
            ImageIO.write(img, "jpg", f);
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }
}

public static void main(String[] args) {
    HelloWorldFrame obj = new HelloWorldFrame();
}
}

Answer 6

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();  
GraphicsDevice[] screens = ge.getScreenDevices();       
Rectangle allScreenBounds = new Rectangle();  
for (GraphicsDevice screen : screens) {  
       Rectangle screenBounds = screen.getDefaultConfiguration().getBounds();        
       allScreenBounds.width += screenBounds.width;  
       allScreenBounds.height = Math.max(allScreenBounds.height, screenBounds.height);
       allScreenBounds.x=Math.min(allScreenBounds.x, screenBounds.x);
       allScreenBounds.y=Math.min(allScreenBounds.y, screenBounds.y);
      } 
Robot robot = new Robot();
BufferedImage bufferedImage = robot.createScreenCapture(allScreenBounds);
File file = new File("C:\\Users\\Joe\\Desktop\\scr.png");
if(!file.exists())
    file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
ImageIO.write( bufferedImage, "png", fos );

bufferedImage将包含一个完整的屏幕截图，这是用三个显示器测试的

Answer 7

您可以使用java.awt.Robot来完成此任务。

下面是服务器代码，它将捕获的屏幕截图保存为目录中的图像。

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketTimeoutException;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.imageio.ImageIO;

public class ServerApp extends Thread
{
       private ServerSocket serverSocket=null;
       private static Socket server = null;
       private Date date = null;
       private static final String DIR_NAME = "screenshots";

   public ServerApp() throws IOException, ClassNotFoundException, Exception{
       serverSocket = new ServerSocket(61000);
       serverSocket.setSoTimeout(180000);
   }

public void run()
   {
       while(true)
      {
           try
           {
              server = serverSocket.accept();
              date = new Date();
                  DateFormat dateFormat = new SimpleDateFormat("_yyMMdd_HHmmss");
              String fileName = server.getInetAddress().getHostName().replace(".", "-");
              System.out.println(fileName);
              BufferedImage img=ImageIO.read(ImageIO.createImageInputStream(server.getInputStream()));
              ImageIO.write(img, "png", new File("D:\\screenshots\\"+fileName+dateFormat.format(date)+".png"));
              System.out.println("Image received!!!!");
              //lblimg.setIcon(img);
          }
         catch(SocketTimeoutException st)
         {
               System.out.println("Socket timed out!"+st.toString());
 //createLogFile("[stocktimeoutexception]"+stExp.getMessage());
                  break;
             }
             catch(IOException e)
             {
                  e.printStackTrace();
                  break;
         }
         catch(Exception ex)
        {
              System.out.println(ex);
        }
      }
   }

   public static void main(String [] args) throws IOException, SQLException, ClassNotFoundException, Exception{
          ServerApp serverApp = new ServerApp();
          serverApp.createDirectory(DIR_NAME);
          Thread thread = new Thread(serverApp);
            thread.start();
   }

private void createDirectory(String dirName) {
    File newDir = new File("D:\\"+dirName);
    if(!newDir.exists()){
        boolean isCreated = newDir.mkdir();
    }
 }
} 

这是在线程上运行的客户端代码，几分钟后它就会捕获用户屏幕的屏幕截图。

package com.viremp.client;

import java.awt.AWTException;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.Socket;
import java.util.Random;

import javax.imageio.ImageIO;

public class ClientApp implements Runnable {
    private static long nextTime = 0;
    private static ClientApp clientApp = null;
    private String serverName = "192.168.100.18"; //loop back ip
    private int portNo = 61000;
    //private Socket serverSocket = null;

    /**
     * @param args
     * @throws InterruptedException 
     */
    public static void main(String[] args) throws InterruptedException {
        clientApp = new ClientApp();
        clientApp.getNextFreq();
        Thread thread = new Thread(clientApp);
        thread.start();
    }

    private void getNextFreq() {
        long currentTime = System.currentTimeMillis();
        Random random = new Random();
        long value = random.nextInt(180000); //1800000
        nextTime = currentTime + value;
        //return currentTime+value;
    }

    @Override
    public void run() {
        while(true){
            if(nextTime < System.currentTimeMillis()){
                System.out.println(" get screen shot ");
                try {
                    clientApp.sendScreen();
                    clientApp.getNextFreq();
                } catch (AWTException e) {
                    // TODO Auto-generated catch block
                    System.out.println(" err"+e);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch(Exception e){
                    e.printStackTrace();
                }

            }
            //System.out.println(" statrted ....");
        }

    }

    private void sendScreen()throws AWTException, IOException {
           Socket serverSocket = new Socket(serverName, portNo);
             Toolkit toolkit = Toolkit.getDefaultToolkit();
             Dimension dimensions = toolkit.getScreenSize();
                 Robot robot = new Robot();  // Robot class 
                 BufferedImage screenshot = robot.createScreenCapture(new Rectangle(dimensions));
                 ImageIO.write(screenshot,"png",serverSocket.getOutputStream());
                 serverSocket.close();
    }
}

Answer 8

Toolkit返回基于PPI的像素，因此，在Windows中使用PPI> 100％时，不会为整个屏幕创建屏幕截图。 我建议这样做：

DisplayMode displayMode = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()[0].getDisplayMode();
Rectangle screenRectangle = new Rectangle(displayMode.getWidth(), displayMode.getHeight());
BufferedImage screenShot = new Robot().createScreenCapture(screenRectangle);