如何在 JLabel 中调整图像/图标图像的大小？

Question

这是我的代码：

String s = "/Applications/Asphalt6.app";
JFileChooser chooser = new JFileChooser();

File file = new File(s);
Icon icon = chooser.getIcon(file);

// show the icon
JLabel ficon = new JLabel(s, icon, SwingConstants.LEFT);

现在，从图标中提取的图像非常小。如何调整它的大小？

Answer 1

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.*;

class BigIcon {

    public static void main(String[] args) {
        JFileChooser chooser = new JFileChooser();
        File f = new File("BigIcon.java");
        Icon icon = chooser.getIcon(f);

        int scale = 4;

        BufferedImage bi = new BufferedImage(
            scale*icon.getIconWidth(),
            scale*icon.getIconHeight(),
            BufferedImage.TYPE_INT_ARGB);
        Graphics2D g = bi.createGraphics();
        g.scale(scale,scale);
        icon.paintIcon(null,g,0,0);
        g.dispose();

        JOptionPane.showMessageDialog(
            null,
            new JLabel(new ImageIcon(bi)));
    }
}