如何在 GroupLayout Java 中设置 Jframe 背景图像 [英] How to set Jframe Background Image in GroupLayout Java

问题描述

我正在尝试为我的框架设置背景图像，但它不起作用.我试过这个链接:

Am trying to set a background image for my frame but it does not work. I tried this link:

在JFrame中设置背景图片

代码:

setContentPane(new JLabel(new ImageIcon(ImageIO.read(new File("/Images/about.png")))));

我尝试将上述代码添加到我的 Contentpane，但它不起作用.

I tried adding the above code to my Contentpane but it does not work.

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                MainMenu frame = new MainMenu();
                frame.setVisible(true);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public MainMenu() {
    setIconImage(Toolkit.getDefaultToolkit().getImage(MainMenu.class.getResource("/Images/bug-red.png")));
    setTitle("Automated Bug Fixing");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 712, 458);

            contentPane = new JPanel();

    //contentPane.setBackground(new Color(220, 220, 220));
    contentPane.setForeground(new Color(32, 178, 170));
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
            *setContentPane(new JLabel(new ImageIcon(ImageIO.read(new File("/Images/about.png")))));*

推荐答案

基本概念看起来不错.

您遇到问题的唯一可能原因是图像不存在.

The only possible reason you might be getting problems is if the image doesn't exist.

看起来您正在尝试引用应该存在于 Jar 上下文中的图像

It looks look you are trying to reference an image that should exist within the context of the Jar

代替

ImageIO.read(new File("/Images/about.png"))

试试

ImageIO.read(getClass().getResource("/Images/about.png"))

相反.

另外，不要吞下异常，确保至少记录所有异常

Also, don't swallow exceptions, make sure all exceptions are been logged at the very least

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.HeadlessException;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class BackgroundFrameImage {

    public static void main(String[] args) {
        new BackgroundFrameImage();
    }

    public BackgroundFrameImage() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                try {
                    JLabel label = new JLabel(new ImageIcon(ImageIO.read(...))));

                    JFrame frame = new JFrame("Testing");
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.setContentPane(label);
                    frame.setLayout(new BorderLayout());
                    JLabel text = new JLabel("Hello from the foreground");
                    text.setForeground(Color.WHITE);
                    text.setHorizontalAlignment(JLabel.CENTER);
                    frame.add(text);
                    frame.pack();
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (IOException | HeadlessException exp) {
                    exp.printStackTrace();
                }
            }
        });
    }

}

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