我創建了一個 GUI，它使用以下類打開文件選擇器： public class FileSelector { File fp; BufferedImage selectedFile; public void SelectFile() { JFileChooser jfc = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory()); jfc.setDialogTitle("Select an image"); jfc.setAcceptAllFileFilterUsed(false); FileNameExtensionFilter filter = new FileNameExtensionFilter("PNG and jpeg images", "png", "jpg", "jpeg"); jfc.addChoosableFileFilter(filter); int returnValue = jfc.showOpenDialog(null); if (returnValue == JFileChooser.APPROVE_OPTION) { fp = jfc.getSelectedFile(); System.out.println(fp); } } public BufferedImage createBufferedImage() throws IOException { ImageFileHandler img_handler = new ImageFileHandler(); if (fp.isFile() && fp.exists()) { selectedFile = ImageIO.read(fp); System.out.println(selectedFile); } BufferedImage bimage = new BufferedImage(28, 28, BufferedImage.TYPE_INT_ARGB); // Draw the image on to the buffered image Graphics2D bGr = bimage.createGraphics(); bGr.drawImage(selectedFile, 0, 0, null); System.out.println(bimage); bGr.dispose(); JFrame frame = new JFrame("Image from Desktop"); JLabel picLabel = new JLabel(new ImageIcon(bimage)); JPanel jPanel = new JPanel(); jPanel.add(picLabel); frame.setSize(new Dimension(400, 300)); frame.add(jPanel); frame.setVisible(true); return bimage; }}然后我有另一個類使用swing 來構建GUI。當前，所選圖像在單獨的 JFrame 中打開。我希望圖像顯示在主界面中displayPanel
1 回答
慕神8447489
TA貢獻1780條經驗 獲得超1個贊
下面演示如何繪制BufferedImage從另一個類中檢索到的。
它也可以用作MCVE的示例。MCVE 應該演示問題，而不是您的應用程序，并且不依賴于不可用的資源。
以下代碼可以復制粘貼到一個文件（Interface.java）中并運行：
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.EtchedBorder;
public class Interface {
private JFrame frame;
public Interface(){
initialize();
}
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Button panel with open file and draw digit buttons
JPanel buttonPanel = new JPanel();
frame.getContentPane().add(buttonPanel, BorderLayout.NORTH);
DrawPanel displayPanel = new DrawPanel();
JButton openFileButton = new JButton("Open File");
openFileButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
BufferedImage image = new FileSelector().createBufferedImage();
displayPanel.setImage(image);
frame.pack();
}
});
buttonPanel.add(openFileButton);
frame.getContentPane().add(displayPanel, BorderLayout.CENTER);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(()-> new Interface());
}
}
class DrawPanel extends JPanel{
private BufferedImage image;
public DrawPanel() {
setPreferredSize(new Dimension (150, 150));
setBorder(BorderFactory.createEtchedBorder(EtchedBorder.LOWERED));
}
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
if(image != null) {
g.drawImage(image, 0,0, null);
}
}
void setImage(BufferedImage image) {
this.image = image;
setPreferredSize(new Dimension(image.getWidth(), image.getHeight()));
}
}
class FileSelector {
public BufferedImage createBufferedImage(){
try {
URL url = new URL("http://www.digitalphotoartistry.com/rose1.jpg");
return ImageIO.read(url);
} catch ( IOException ex) { ex.printStackTrace();}
return null;
}
}
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