blocks|key|2309604|text|我认为你展示的示例代码是非常正确的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2309605|你能用下面的代码测试它吗？:D如果你像你所展示的那样删除contentPane.printAll(g2d)，只有白色窗口|offset|length|style|CODE|2309606|public+class+ImageSaveTest+extends+JFrame+{

++++public+static+void+main(String[]+args)+{
++++++++new+ImageSaveTest();
++++}

++++public+ImageSaveTest()+{
++++++++setDefaultCloseOperation(EXIT_ON_CLOSE);
++++++++setLayout(new+BorderLayout());

++++++++JPanel+panel+=+new+JPanel();
++++++++panel.setPreferredSize(new+Dimension(300,+300));
++++++++panel.setLayout(new+GridBagLayout());

++++++++JLabel+label+=+new+JLabel("Hello!+StackOverflow(Press+Enter)");
++++++++label.setFont(new+Font("Default",+Font.BOLD,+15));

++++++++panel.add(label);
++++++++add(panel);
++++++++setVisible(true);
++++++++pack();

++++++++addKeyListener(new+KeyAdapter()+{
++++++++++++@Override
++++++++++++public+void+keyPressed(KeyEvent+e)+{
++++++++++++++++System.out.println(e.getKeyCode());
++++++++++++++++if(e.getKeyCode()+==+KeyEvent.VK_ENTER)+{
++++++++++++++++++++try+{
++++++++++++++++++++++++Container+contentPane+=+getContentPane();
++++++++++++++++++++++++BufferedImage+image+=+new+BufferedImage(contentPane.getWidth(),+contentPane.getHeight(),
++++++++++++++++++++++++++++++++BufferedImage.TYPE_INT_RGB);
++++++++++++++++++++++++Graphics2D+g2d+=+image.createGraphics();
++++++++++++++++++++++++contentPane.printAll(g2d);
++++++++++++++++++++++++g2d.dispose();

++++++++++++++++++++++++//+replace+this+path+to+your+image
++++++++++++++++++++++++ImageIO.write(image,+"jpeg",+new+File("Your+Path/Print.png"));
++++++++++++++++++++}+catch+(IOException+ex)+{
++++++++++++++++++++++++//+Exception+Handling
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++});
++++}
}|code-block|syntax|javascript|2309607|entityMap^0|0|S|P|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I think the example code you showed is pretty much the right... 
Can you test it with the code below? :D
If you remove <code>contentPane.printAll(g2d)</code> As you showed, only the white window

<pre class="lang-java prettyprint-override"><code>public class ImageSaveTest extends JFrame {

 public static void main(String[] args) {
 new ImageSaveTest();
 }

 public ImageSaveTest() {
 setDefaultCloseOperation(EXIT_ON_CLOSE);
 setLayout(new BorderLayout());

 JPanel panel = new JPanel();
 panel.setPreferredSize(new Dimension(300, 300));
 panel.setLayout(new GridBagLayout());

 JLabel label = new JLabel("Hello! StackOverflow(Press Enter)");
 label.setFont(new Font("Default", Font.BOLD, 15));

 panel.add(label);
 add(panel);
 setVisible(true);
 pack();

 addKeyListener(new KeyAdapter() {
 @Override
 public void keyPressed(KeyEvent e) {
 System.out.println(e.getKeyCode());
 if(e.getKeyCode() == KeyEvent.VK_ENTER) {
 try {
 Container contentPane = getContentPane();
 BufferedImage image = new BufferedImage(contentPane.getWidth(), contentPane.getHeight(),
 BufferedImage.TYPE_INT_RGB);
 Graphics2D g2d = image.createGraphics();
 contentPane.printAll(g2d);
 g2d.dispose();

 // replace this path to your image
 ImageIO.write(image, "jpeg", new File("Your Path/Print.png"));
 } catch (IOException ex) {
 // Exception Handling
 }
 }
 }
 });
 }
}
</code></pre>

blocks|key|2521303|text|Update我做了一些研究，正如我想的那样，解决方案是我应该通过覆盖JFrame上的paintComponent()方法来呈现所有内容(我想)。目前我真的不知道怎么做，但我想我应该能够修复它。在接下来的几天里我会很忙，但我会告诉你我什么时候能让它工作！|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2521304|entityMap|0|LINK|mutability|MUTABLE|url|in+case+someone+has+the+same+problem+:3^0|0|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

[Update] (in case someone has the same problem :3)
I did a bit of research and, as i supposed, the solution is that I should be rendering everything by overriding the paintComponent() method on the JFrame (I suppose). For the moment I don't really know how to do it, but I think I should be able to fix it. I'll be pretty busy in the upcoming days, but I'll tell you when I will get it working! =)

blocks|key|2521317|text|下面是我的代码(我知道，它很长)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2521318|package+dev.patatonzolo.first2Dgame;

import+java.awt.Color;
import+java.awt.Container;
import+java.awt.Graphics;
import+java.awt.Graphics2D;
import+java.awt.event.MouseEvent;
import+java.awt.image.BufferStrategy;
import+java.awt.image.BufferedImage;
import+java.io.File;
import+java.io.IOException;
import+javax.imageio.ImageIO;
import+javax.swing.JPanel;
import+dev.patatonzolo.first2Dgame.display.Display;
import+dev.patatonzolo.first2Dgame.gfx.Assets;
import+dev.patatonzolo.first2Dgame.gfx.GameCamera;
import+dev.patatonzolo.first2Dgame.playerInput.KeyManager;
import+dev.patatonzolo.first2Dgame.playerInput.MouseInput;
import+dev.patatonzolo.first2Dgame.ppes.GaussianBlur;
import+dev.patatonzolo.first2Dgame.states.GameState;
import+dev.patatonzolo.first2Dgame.states.IgMenuState;
import+dev.patatonzolo.first2Dgame.states.MainMenuState;
import+dev.patatonzolo.first2Dgame.states.OpeningState;
import+dev.patatonzolo.first2Dgame.states.OptionsState;
import+dev.patatonzolo.first2Dgame.states.QuitState;
import+dev.patatonzolo.first2Dgame.states.State;

public+class+Game+extends+JPanel+implements+Runnable+{

++++private+Display+display;
++++private+int+width;
++++private+int+height;
++++public+String+title;
++++protected+int+ticks+=+0;

++++private+Thread+thread;

++++private+boolean+running+=+false;
++++private+BufferStrategy+bufferStrategy;
++++private+Graphics2D+graphics2d;

++++public+State+gameState;
++++public+State+openingState;
++++public+State+igMenuState;
++++public+State+mainMenuState;
++++public+State+optionsState;
++++public+State+quitState;

++++private+KeyManager+keyManager;
++++private+MouseInput+mouseInput;

++++private+GameCamera+gameCamera;

++++private+Handler+handler;


++++public+Game(String+title,+int+width,+int+height)+{
++++++++this.width+=+width;
++++++++this.height+=+height;
++++++++this.title+=+title;
++++++++keyManager+=+new+KeyManager();
++++++++mouseInput+=+new+MouseInput();
++++}

++++private+void+takeScreenshot()+{
++++++++try+{
++++++++Container+contentPane+=+display.getFrame().getContentPane();
++++++++BufferedImage+image+=+new+BufferedImage(contentPane.getWidth(),+contentPane.getHeight(),
++++++++++++++++BufferedImage.TYPE_INT_RGB);
++++++++Graphics2D+g2d+=+image.createGraphics();
++++++++contentPane.printAll(g2d);
++++++++g2d.dispose();

++++++++ImageIO.write(image,+"png",+new+File("C:\\Users\\VgRig\\eclipse-workspace\\First2DGame\\res\\textures\\screenshot.png"));
++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++++++}
++++}

++++@Override
++++++++protected+void+paintComponent(Graphics+g)+{
++++++++++++super.paintComponent(g);
++++++++++++Graphics2D+g2d+=+(Graphics2D)g;

++++++}

++++private+void+init()+{
++++++++display+=+new+Display(title,+width,+height);
++++++++display.getFrame().addKeyListener(keyManager);
++++++++display.getFrame().addMouseListener(mouseInput);
++++++++display.getFrame().addMouseMotionListener(mouseInput);
++++++++display.getCanvas().addMouseListener(mouseInput);
++++++++display.getCanvas().addMouseMotionListener(mouseInput);
++++++++Assets.init();

++++++++handler+=+new+Handler(this);
++++++++gameCamera+=+new+GameCamera(handler,+0,+0);
++++++++gameState+=+new+GameState(handler);
++++++++openingState+=+new+OpeningState(handler);
++++++++igMenuState+=+new+IgMenuState(handler);
++++++++mainMenuState+=+new+MainMenuState(handler);
++++++++optionsState+=+new+OptionsState(handler);
++++++++quitState+=+new+QuitState(handler);
++++++++State.setState(gameState);

++++}

++++public+void+update()+{
++++++++keyManager.update();
++++++++mouseInput.update();
++++++++if(State.getState()+!=+null)+{
++++++++++++State.getState().update();
++++++++}

++++++++if(handler.getKeyManager().right)+{
++++++++}

++++++++//+MENUS+
++++++++if(handler.getKeyManager().menu)+{
++++++++++++takeScreenshot();
++++++++++++//GaussianBlur.Blur();
++++++++++++State.setState(igMenuState);
++++++++}
++++++++if(State.getState()+==+gameState+&&+handler.getKeyManager().menu)+{
++++++++++++State.setState(gameState);
++++++++}

++++++++if(State.getState()+!=+igMenuState)+{
++++++++++++IgMenuState.currentSelection+=+4;
++++++++}
++++++++if(State.getState()+!=+quitState)+{
++++++++++++QuitState.currentSelection+=+2;
++++++++}

++++}

++++private+void+render()+{
++++++++bufferStrategy+=+display.getCanvas().getBufferStrategy();
++++++++if(bufferStrategy+==+null)+{
++++++++++++display.getCanvas().createBufferStrategy(3);
++++++++++++return;
++++++++}
++++++++graphics2d+=+(Graphics2D)+bufferStrategy.getDrawGraphics();
++++++++graphics2d.clearRect(0,+0,+width,+height);

++++++++if(State.getState()+!=+null)+{
++++++++++++State.getState().render(graphics2d);
++++++++}

++++++++bufferStrategy.show();
++++++++graphics2d.dispose();

++++}

++++public+void+run()+{+
++++++++init();

++++++++int+fps+=+60;
++++++++double+timePerTick+=+1000000000+/+fps;
++++++++double+delta+=+0;
++++++++long+now;
++++++++long+lastTime+=+System.nanoTime();
++++++++long+framePerSecond+=+0;

++++++++while(running)+{
++++++++++++now+=+System.nanoTime();
++++++++++++delta+%2B=+(now+-+lastTime)+/+timePerTick;
++++++++++++framePerSecond+%2B=+now+-+lastTime;
++++++++++++lastTime+=+now;

++++++++++++if(delta+>=+1)+{
++++++++++++++++update();
++++++++++++++++render();
++++++++++++++++ticks+%2B%2B;
++++++++++++++++delta+--;
++++++++++++}

++++++++++++if(framePerSecond+>=+1000000000)+{
++++++++++++++++System.out.println("Game+running+at+["+%2B+ticks+%2B+"+FPS]");
++++++++++++++++ticks+=+0;
++++++++++++++++framePerSecond+=+0;
++++++++++++}
++++++++}+++++++

++++++++stop();
++++}

++++public+int+getTicks()+{
++++++++return+ticks;
++++}

++++public+void+setTicks(int+ticks)+{
++++++++this.ticks+=+ticks;
++++}

++++public+KeyManager+getKeyManager()+{
++++++++return+keyManager;
++++}

++++public+MouseInput+getMouseInput()+{
++++++++return+mouseInput;
++++}

++++public+GameCamera+getGameCamera()+{
++++++++return+gameCamera;
++++}

++++public+int+getWidth()+{
++++++++return+width;
++++}

++++public+int+getHeight()+{
++++++++return+height;
++++}

++++public+synchronized+void+start()+{
++++++++if(running)
++++++++++++return;
++++++++running+=+true;
++++++++thread+=+new+Thread(this);
++++++++thread.start();
++++}

++++public+synchronized+void+stop()+{
++++++++if(running+=+false)
++++++++++++return;
++++++++running+=+false;
++++++++try+{
++++++++++++thread.join();
++++++++}+catch+(InterruptedException+e)+{
++++++++++++e.printStackTrace();
++++++++}

++++}

}|code-block|syntax|javascript|2521319|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's my code (I know, it's quite long):

<pre><code>
package dev.patatonzolo.first2Dgame;

import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JPanel;
import dev.patatonzolo.first2Dgame.display.Display;
import dev.patatonzolo.first2Dgame.gfx.Assets;
import dev.patatonzolo.first2Dgame.gfx.GameCamera;
import dev.patatonzolo.first2Dgame.playerInput.KeyManager;
import dev.patatonzolo.first2Dgame.playerInput.MouseInput;
import dev.patatonzolo.first2Dgame.ppes.GaussianBlur;
import dev.patatonzolo.first2Dgame.states.GameState;
import dev.patatonzolo.first2Dgame.states.IgMenuState;
import dev.patatonzolo.first2Dgame.states.MainMenuState;
import dev.patatonzolo.first2Dgame.states.OpeningState;
import dev.patatonzolo.first2Dgame.states.OptionsState;
import dev.patatonzolo.first2Dgame.states.QuitState;
import dev.patatonzolo.first2Dgame.states.State;

public class Game extends JPanel implements Runnable {

 private Display display;
 private int width;
 private int height;
 public String title;
 protected int ticks = 0;

 private Thread thread;

 private boolean running = false;
 private BufferStrategy bufferStrategy;
 private Graphics2D graphics2d;

 public State gameState;
 public State openingState;
 public State igMenuState;
 public State mainMenuState;
 public State optionsState;
 public State quitState;

 private KeyManager keyManager;
 private MouseInput mouseInput;

 private GameCamera gameCamera;

 private Handler handler;


 public Game(String title, int width, int height) {
 this.width = width;
 this.height = height;
 this.title = title;
 keyManager = new KeyManager();
 mouseInput = new MouseInput();
 }

 private void takeScreenshot() {
 try {
 Container contentPane = display.getFrame().getContentPane();
 BufferedImage image = new BufferedImage(contentPane.getWidth(), contentPane.getHeight(),
 BufferedImage.TYPE_INT_RGB);
 Graphics2D g2d = image.createGraphics();
 contentPane.printAll(g2d);
 g2d.dispose();

 ImageIO.write(image, "png", new File("C:\\Users\\VgRig\\eclipse-workspace\\First2DGame\\res\\textures\\screenshot.png"));
 } catch (IOException e) {
 e.printStackTrace();
 }
 }

 @Override
 protected void paintComponent(Graphics g) {
 super.paintComponent(g);
 Graphics2D g2d = (Graphics2D)g;

 }

 private void init() {
 display = new Display(title, width, height);
 display.getFrame().addKeyListener(keyManager);
 display.getFrame().addMouseListener(mouseInput);
 display.getFrame().addMouseMotionListener(mouseInput);
 display.getCanvas().addMouseListener(mouseInput);
 display.getCanvas().addMouseMotionListener(mouseInput);
 Assets.init();

 handler = new Handler(this);
 gameCamera = new GameCamera(handler, 0, 0);
 gameState = new GameState(handler);
 openingState = new OpeningState(handler);
 igMenuState = new IgMenuState(handler);
 mainMenuState = new MainMenuState(handler);
 optionsState = new OptionsState(handler);
 quitState = new QuitState(handler);
 State.setState(gameState);

 }

 public void update() {
 keyManager.update();
 mouseInput.update();
 if(State.getState() != null) {
 State.getState().update();
 }

 if(handler.getKeyManager().right) {
 }

 // MENUS 
 if(handler.getKeyManager().menu) {
 takeScreenshot();
 //GaussianBlur.Blur();
 State.setState(igMenuState);
 }
 if(State.getState() == gameState &amp;&amp; handler.getKeyManager().menu) {
 State.setState(gameState);
 }

 if(State.getState() != igMenuState) {
 IgMenuState.currentSelection = 4;
 }
 if(State.getState() != quitState) {
 QuitState.currentSelection = 2;
 }

 }

 private void render() {
 bufferStrategy = display.getCanvas().getBufferStrategy();
 if(bufferStrategy == null) {
 display.getCanvas().createBufferStrategy(3);
 return;
 }
 graphics2d = (Graphics2D) bufferStrategy.getDrawGraphics();
 graphics2d.clearRect(0, 0, width, height);

 if(State.getState() != null) {
 State.getState().render(graphics2d);
 }

 bufferStrategy.show();
 graphics2d.dispose();

 }

 public void run() { 
 init();

 int fps = 60;
 double timePerTick = 1000000000 / fps;
 double delta = 0;
 long now;
 long lastTime = System.nanoTime();
 long framePerSecond = 0;

 while(running) {
 now = System.nanoTime();
 delta += (now - lastTime) / timePerTick;
 framePerSecond += now - lastTime;
 lastTime = now;

 if(delta &gt;= 1) {
 update();
 render();
 ticks ++;
 delta --;
 }

 if(framePerSecond &gt;= 1000000000) {
 System.out.println("Game running at [" + ticks + " FPS]");
 ticks = 0;
 framePerSecond = 0;
 }
 } 

 stop();
 }

 public int getTicks() {
 return ticks;
 }

 public void setTicks(int ticks) {
 this.ticks = ticks;
 }

 public KeyManager getKeyManager() {
 return keyManager;
 }

 public MouseInput getMouseInput() {
 return mouseInput;
 }

 public GameCamera getGameCamera() {
 return gameCamera;
 }

 public int getWidth() {
 return width;
 }

 public int getHeight() {
 return height;
 }

 public synchronized void start() {
 if(running)
 return;
 running = true;
 thread = new Thread(this);
 thread.start();
 }

 public synchronized void stop() {
 if(running = false)
 return;
 running = false;
 try {
 thread.join();
 } catch (InterruptedException e) {
 e.printStackTrace();
 }

 }

}
</code></pre>

I am currently developing a 2D game in Java (I use a JFrame). I would like to, when a certain button is pressed, save the content of the frame and store it in an image. For the moment, I use the following code:

<pre class="lang-java prettyprint-override"><code>Robot robot = new Robot();
Rectangle screenSize = new Rectangle(display.getFrame().getX() + 3, display.getFrame().getY() + 26, handler.getWidth(), handler.getHeight());

BufferedImage screenShot = robot.createScreenCapture(screenSize); ImageIO.write(screenShot,File("D:\\Programming\\First2DGame\\res\\textures\\Screenshot.png"));
</code></pre>

The problem is that this takes a screenshot of a portion of the screen, and not of the frame itself. This means that if, for example, I move my window to the bottom right of the screen, I receive a discord notification and then I press my button, the notification will be present in the screenshot. 

I have already searched a bit, a I tried this code:

<pre class="lang-java prettyprint-override"><code> try
 {
 BufferedImage image = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
 Graphics2D graphics2D = image.createGraphics();
 frame.paint(graphics2D);
 ImageIO.write(image,"jpeg", new File("D:\\Programming\\First2DGame\\res\\textures\\Screenshot.png"));
 }
 catch(Exception e)
 {
 e.printStackTrace;
 }
 }

 protected void paintComponent(Graphics g)
 {
 g.drawRect(50,50,50,50);
 }
</code></pre>

but the result is a white window:

<a href="https://i.stack.imgur.com/HHLdn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HHLdn.png" alt="you can see it here"></a>

Do you perhaps know how to create a screenshot of only the frame?

Save JFrame content as a .png

Java

我目前正在用Java开发一个2D游戏(我使用的是JFrame)。我想，当某个按钮被按下时，保存框架的内容并将其存储在图像中。目前，我使用以下代码：Robot robot = new Robot();Rectangle screenSize = new Rectangle(display.getFrame().getX(...

问将JFrame内容另存为.png
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