Java - 无法从文件中绘制图像

Question

我使用 NetBeans，我想在 jPanel 上显示图像(基本上是为了使其滚动)。我写了这段代码

    Graphics g=jPanelScrolling.getGraphics();
    File fileBackground = new File("background.jpg");
    Image background;
    try{
        background=ImageIO.read(fileBackground);
        final int WIDTH=background.getWidth(rootPane);            
        final int HEIGHT=background.getHeight(rootPane);
        g.drawImage(background, WIDTH, HEIGHT, rootPane);
    }
    catch(IOException e){
        background=null;
        jPanelScrolling.setBackground(Color.red);  //to test if the image has been succesfully uploaded
    }

但是当我执行它时，它只显示 void jPanel

我怎样才能让它发挥作用？

Answer 1

尝试，

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;

public class ImageInFrame {
    public static void main(String[] args) throws IOException {
        String path = "Image1.jpg";
        File file = new File(path);
        BufferedImage image = ImageIO.read(file);
        JLabel label = new JLabel(new ImageIcon(image));
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(label);
        f.pack();
        f.setLocation(200,200);
        f.setVisible(true);
    }
}