无法截取JFrame Java Swing的截图 [英] Unable Take screenshot of JFrame Java Swing
问题描述
我尝试使用以下方法将JFrame保存为图像。
I have tried to save the JFrame as an image using the following approach.
try
{
BufferedImage image = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
this.paint(image.getGraphics());
ImageIO.write(image,"png", new File("Test.png"));
}
catch(Exception exception)
{
//code
System.out.print("Exception unable to write image");
}
我想保存截图如下：
I am trying to save a screenshot as follows:
我想要连我的屏幕截图中的标题
I would like to have even the title in my screenshot
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Path2D;
import java.awt.geom.Point2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class DividedSquare {
public static void main(String[] args) {
new DividedSquare();
}
public DividedSquare() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private TriangleShape baseTriangle;
private Color[] colors;
public TestPane() {
colors = new Color[]{Color.RED, Color.GREEN, Color.BLUE, Color.MAGENTA};
}
@Override
public void invalidate() {
super.invalidate();
baseTriangle = new TriangleShape(
new Point(0, 0),
new Point(getWidth(), 0),
new Point(getWidth() / 2, getHeight() / 2));
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
String text[] = new String[]{
"123.123",
"456.789",
"012.315",
"678.921"
};
FontMetrics fm = g2d.getFontMetrics();
double angel = 0;
for (int index = 0; index < 4; index++) {
g2d.setColor(colors[index]);
Path2D rotated = rotate(baseTriangle, angel);
g2d.fill(rotated);
Rectangle bounds = rotated.getBounds();
int x = bounds.x + ((bounds.width - fm.stringWidth(text[0])) / 2);
int y = bounds.y + (((bounds.height - fm.getHeight()) / 2) + fm.getAscent());
g2d.setColor(Color.WHITE);
g2d.drawString(text[index], x, y);
angel += 90;
}
g2d.setColor(Color.BLACK);
g2d.drawLine(0, 0, getWidth(), getHeight());
g2d.drawLine(getWidth(), 0, 0, getHeight());
g2d.dispose();
try
{
BufferedImage image = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
frame.paint(image.getGraphics());
ImageIO.write(image,"png", new File("Practice.png"));
}
catch(Exception exception)
{
//code
System.out.print("Exception to write image");
}
}
public Path2D rotate(TriangleShape shape, double angel) {
Rectangle bounds = shape.getBounds();
int x = bounds.width / 2;
int y = bounds.width / 2;
return new Path2D.Float(shape, AffineTransform.getRotateInstance(
Math.toRadians(angel),
x,
y));
}
}
public class TriangleShape extends Path2D.Double {
public TriangleShape(Point2D... points) {
moveTo(points[0].getX(), points[0].getY());
lineTo(points[1].getX(), points[1].getY());
lineTo(points[2].getX(), points[2].getY());
closePath();
}
}
}
但是我图像无法创建。我无法理解为什么。
我查看了这个但无法理解如何将其合并到我的情况。
But I the image does not get created. I am unable to understand why. I looked at this but am unable to understand how to incorporate it in my case.
编辑
根据评论，我尝试使用机器人类但我无法知道从哪里调用此功能。如果我从paint（）方法调用此函数，我将无法获取颜色和文本。
Based on comments, I tried using robot class but am unable to know where to call this function from. If I call this function from the paint() method, I am unable to get the colors and text.
void screenshot()
{
try
{
Robot robot = new Robot();
// Capture the screen shot of the area of the screen defined by the rectangle
Point p = frame.getLocationOnScreen();
System.out.print("point" + p);
BufferedImage bi=robot.createScreenCapture(new Rectangle((int)p.getX(),(int)p.getY(),frame.getWidth(),frame.getHeight()));
ImageIO.write(bi, "png", new File("imageTest.png"));
}
catch(Exception exception)
{
//code
System.out.print("Exception to write image");
}
}
推荐答案
至少有两种方法可以实现这一目标...
There are at least two ways you might achieve this...
使用 Robot 捕获屏幕截图。对于示例
Use Robot to capture a screen shot. For example
问题与这需要花费一些精力来定位您想要捕获的组件。它也只捕获一个矩形区域，所以如果组件是透明的， Robot 将不会尊重这个......
The problem with this is it takes a little effort to target the component you want to capture. It also only captures a rectangular area, so if the component is transparent, Robot won't respect this...
使用 printAll 将组件呈现给你自己的图形上下文，通常来自 BufferedImage
Use printAll to render the component to your own Graphics context, typically from a BufferedImage
printAll 允许你打印一个组件，因为打算不将它打印到屏幕上， printAll 禁用双缓冲，使其在使用时更有效率你不想将组件渲染到屏幕上，例如将其打印到打印机......
printAll allows you to print a component, because the intention is not to print this to the screen, printAll disables double buffering, making it more efficient to use when you don't want to render the component to the screen, such printing it to a printer...
对于 example
这篇关于无法截取JFrame Java Swing的截图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
