我正在尝试在 JPanel 中显示图像。我正在为此使用 swingx 库 - ImagePainter。因此，我创建了一个 JXPanel，并将背景画家设置为 ImagePainter。
现在，我需要在 2 个单独的 JFrame 中的 2 个 JPanel 上显示相同的图像。当我这样做时，我遇到了堆空间问题。在这种情况下，我是否共享同一个 ImagePainter 实例？那会有帮助吗？但这意味着如果我需要显示多个独特的图像，无论如何我都会遇到内存不足的错误。我做错了什么吗？
我使用的代码如下：
public static ImagePainter getImagePainter(String imageLocation) {
ImagePainter imgPainter=null;
try {
imgPainter = new ImagePainter(ImageIO.read(new File(imageLocation)));
} catch (IOException e) {
throw new SwingObjectRunException(e, ErrorSeverity.SEVERE, CommonUI.class);
}
return imgPainter;
}
错误堆栈跟踪如下：
Caused by: java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:59)
at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:397)
at java.awt.image.Raster.createWritableRaster(Raster.java:938)
at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1056)
at javax.imageio.ImageReader.getDestination(ImageReader.java:2879)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:980)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:948)
at javax.imageio.ImageIO.read(ImageIO.java:1422)
at javax.imageio.ImageIO.read(ImageIO.java:1282)
更新：这是显示问题的 SSCCE： 您需要 jgoodies 表单布局 jar 和类路径中的 swingx jar 才能编译。再次单击 On Image 两次，对我来说，出现内存不足错误。我使用的图像也附上。
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jdesktop.swingx.JXPanel;
import org.jdesktop.swingx.painter.ImagePainter;
import com.jgoodies.forms.layout.CellConstraints;
import com.jgoodies.forms.layout.FormLayout;
public class Photo {
/**
* @param args
*/
public static void main(String[] args) {
try{
JFrame frame=new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel=new JPanel();
panel.setLayout(new FormLayout("5dlu,fill:250px,15dlu", "5dlu,fill:150px,15dlu,fill:pref,5dlu"));
panel.add(getImagePanel(), new CellConstraints(2, 2));
JButton btnOpenDiag=new JButton("Open Image Again");
panel.add(btnOpenDiag,new CellConstraints(2, 4, 1, 1, CellConstraints.CENTER, CellConstraints.FILL));
btnOpenDiag.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
JDialog dialog=new JDialog();
JPanel panel=new JPanel();
panel.setLayout(new FormLayout("5dlu,fill:250px,15dlu", "5dlu,fill:150px,5dlu"));
panel.add(Photo.getImagePanel(), new CellConstraints(2, 2));
dialog.setContentPane(panel);
dialog.pack();
dialog.setVisible(true);
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
frame.setContentPane(panel);
frame.pack();
frame.setVisible(true);
}catch(Exception e){
}
}
protected static JXPanel getImagePanel() throws IOException {
JXPanel imgPanel=new JXPanel();
ImagePainter painter=new ImagePainter(ImageIO.read(new File(Photo.class.getResource("image.jpg").getFile())));
painter.setFillHorizontal(true);
painter.setFillVertical(true);
imgPanel.setBackgroundPainter(painter);
return imgPanel;
}
}