Java JPanel平铺背景图片

Question

我目前有用于创建JOptionPane的代码，无论我将其设置为什么大小，它都会将图像平铺到背景上：）

package test;
import java.awt.*;  
import java.awt.image.BufferedImage;  
import java.io.*;  
import javax.imageio.ImageIO;  
import javax.swing.*;

public class TiledImage extends JPanel {  
    BufferedImage tileImage;


    public TiledImage(BufferedImage image) {  
        tileImage = image;  
    }

    protected void paintComponent(Graphics g) {  
        int width = getWidth();  
        int height = getHeight();  
        for (int x = 0; x < width; x += tileImage.getWidth()) {  
            for (int y = 0; y < height; y += tileImage.getHeight()) {  
                g.drawImage(tileImage, x, y, this);  
            }  
        }  
    }

    public Dimension getPreferredSize() {  
        return new Dimension(240, 240);  
    }

    public static void main(String[] args) throws IOException {  
        BufferedImage image = ImageIO.read(new File("./resource/patterngrey.png"));  
        TiledImage test = new TiledImage(image);  
        JOptionPane.showMessageDialog(null, test, "", JOptionPane.PLAIN_MESSAGE);  
    }  
}

我遇到的问题是使用相同的代码将图像添加到JFrame中的JPanel背景中，这是我的问题：

package test;
import java.awt.*;  
import java.awt.image.BufferedImage;  
import java.io.*;  
import javax.imageio.ImageIO;  
import javax.swing.*;

public class TiledImage extends JPanel {  
    BufferedImage tileImage;  
    static JFrame mainFrame = new JFrame("Program Name");
    static JPanel userDetailsPanel = new JPanel();

    public TiledImage(BufferedImage image) {  
        tileImage = image;  
    }

    protected void paintComponent(Graphics g) {  
        int width = getWidth();  
        int height = getHeight();  
        for (int x = 0; x < width; x += tileImage.getWidth()) {  
            for (int y = 0; y < height; y += tileImage.getHeight()) {  
                g.drawImage(tileImage, x, y, this);  
            }  
        }  
    }


    public static void main(String[] args) throws IOException {  
        mainFrame.setSize(400,400);
        mainFrame.setLayout(new BorderLayout());
        mainFrame.add(userDetailsPanel, BorderLayout.CENTER);
        BufferedImage image = ImageIO.read(new File("./resource/patterngrey.png"));  
        TiledImage backgroundImage = new TiledImage(image);  
   //   userDetailsPanel.setComponent(backgroundImage); //i know this line is wrong 
   //but i dont know how to correct it
        mainFrame.setVisible(true);
    }  
}

如果有更好的方法可以做到，而代码少得多，那就更好了，我们将不胜感激。我对背景进行排序后，确实需要在背景顶部添加标签和按钮。

背景需要平铺，因为应用程序将在JFrame中具有几个具有不同图案背景的不同JPanels，我想使框架可调整大小

Answer 1

要更正当前存在的问题，可以将TiledImage对象设置为JFrame的内容窗格，然后确保添加到其上的所有面板都不透明。

那是，

public static void main(String[] args) throws IOException {  
    mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    BufferedImage image = ImageIO.read(new File("./resource/patterngrey.png"));  
    TiledImage backgroundImage = new TiledImage(image);  
    // Make backgroundImage the content pane.
    mainFrame.setContentPane(backgroundImage);
    mainFrame.setLayout(new BorderLayout());
    // Make the userDetailsPanel not opaque.
    userDetailsPanel.setOpaque(false);
    mainFrame.add(userDetailsPanel, BorderLayout.CENTER);

    mainFrame.setSize(400,400);
    mainFrame.setVisible(true);
}