[Java]JButton按鈕透明背景

下圖是利用在JButton裡加入panel來做其背景圖片JLabel，字的部份也可以直接使用JLabel add於Panel上，如此一來可以很方便的控制文字及圖片的位置，只是在做運算x與y坐標時會比較麻煩，此方法也可與html-tag互相併用，以達更好的效果。

package yku;

import java.awt.Frame;
import javax.swing.JButton;
import java.awt.BorderLayout;
import javax.swing.*;

import java.awt.Image;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import javax.swing.JPanel;


public class Label extends Frame {

    private static final long serialVersionUID = 1L;
    private JButton jButton = null;
    private JPanel jPanel = null;
    

    /**
     * This is the default constructor
     */
    public Label() {
        super();
        initialize();
    }

    /**
     * This method initializes this
     * 
     * @return void
     */
    private void initialize() {
        this.setSize(500, 600);
        this.setTitle("JLabel圖片");

        this.add(getJPanel(), BorderLayout.CENTER);
        // this.add(getJButton1(), BorderLayout.CENTER);
        // jButton要先加入才能在下層
    }

    /**
     * This method initializes jButton
     * 
     * @return javax.swing.JButton
     */
    private JButton getJButton() {
        if (jButton == null) {
            jButton = new JButton();

        }
        return jButton;
    }

    /**
     * This method initializes jPanel
     * 
     * @return javax.swing.JPanel
     */
    private JPanel getJPanel() {
        if (jPanel == null) {
            jPanel = new JPanel();
            jPanel.setLayout(new BorderLayout());

            // 用來畫背景圖
            MyPanel panel = new MyPanel();
            // 把panel的寬高大小設跟jButton一樣
            panel.setPreferredSize(jPanel.getPreferredSize());

            // 記得要設Layout為null才會有實際寬高
            panel.setLayout(null);

            yku.tool.Image tool = new yku.tool.Image("/han.png");
            try {
                BufferedImage src = javax.imageio.ImageIO.read(tool
                        .getImageUrl());
                Image image = src.getScaledInstance(259, 194,
                        Image.SCALE_SMOOTH);
                ImageIcon img = new ImageIcon(image);
                JLabel lab = new JLabel(img);
                JLabel labText = new JLabel("要輸出的字");
                
                lab.setBounds(100, 100, img.getIconWidth(), img.getIconHeight());
                labText.setBounds(0, 0, img.getIconWidth() + 20,
                        img.getIconHeight());
                                                
                // pan0.add(jPanel);
                panel.add(labText);
                panel.add(lab);
                getJButton().add(panel);
                jPanel.add(getJButton(), BorderLayout.CENTER);

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

    /**
     * This method initializes jButton1
     * 
     * @return javax.swing.JButton
     */

    private static class MyPanel extends javax.swing.JPanel {
        /**
         * 
         */
        private static final long serialVersionUID = 1L;

        // 物件以下元件重畫,此panel會是個透明panel
        public void paint(Graphics g) {
            paintChildren(g);
        }
    }

    public static void main(String args[]) {
        (new Label()).setVisible(true);
    }
}

附上讀取class目錄檔案的方式，可以直接把圖檔放置在執行的class跟目錄

package yku.tool;

public class Image {
    private String image ;
    public Image(String image)
    {
        this.image = image;
    }
    public java.net.URL getImageUrl() {

        return this.getClass().getResource(image);
    }

    public String getImagePath() {
        return getImageUrl().toString();
    }
}