如何将图片添加到JButton？

eclipse示例：
阅读以上内容后，我仍需要进行更多的研究才能理解在eclipse中如何存储图像资源以及放置的位置。
结果是：在eclipse中，您需要将图像存储在任何“源文件夹”（例如“src”）下方或在“文件夹”下方。
您可以通过右键单击项目，“新建”->“源文件夹”或“新建”->“文件夹”来创建它们。任何文件夹名称都可以。"<Source Folder>/<image Folder>"的示例为"src/images"或"resource/img"。
以下是一些完全运行的示例代码，其中期望在“images”文件夹中有两个按钮图像，“Button-Image-Up.png”和“Button-Image-Down.png”：

import javax.swing.JDialog;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

@SuppressWarnings("serial")
public class ImageButtonDlg extends JDialog {
    // define button images and fall-back text
    private static gstrTxt="<Button Fall-back Text>"; // in case image does not load
    private static String gstrImgUp="Button-Image-Up.png";   // regular image
    private static String gstrImgDown="Button-Image-Down.png"; // button pressed image
    private static String gstrImgFolder="images";   // image folder, "/images" is also fine
    public static void main(String[] args) {
        ImageButtonDlg dialog = new ImageButtonDlg();
        dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        dialog.setVisible(true);
    }
    /**
     * Create the dialog.
     */
    public ImageButtonDlg() {
        initializeDialog();
    }
    /**
     * Create a new ImageIcon from an image resource. 
     * The input can be: 
     * - an image file name, e.g. <image.png> 
     * - a relative path, e.g. <image/image.png>
     * - an absolute path, e.g. </home/user/dev/image.png>
     * In eclipse, images can be stored below any project "Source folder", 
     * such as "src".
     * ├── src
     * │   ├── img1.png
     * │   └── images
     * │       └── img2.png
     * ├── resources
     * │   ├── img3.png
     * │   └── images
     * │       └── img4.png
     * └── img5.png
     *  In above example img1.png to img4.png are found by 
     *  image file name or relative path
     *  However, img5 is stored in the project root folder and 
     *  needs an absolute path.
     *    
     * @param strImagePath - image filename, absolute path or relative path
     * @return new ImageIcon or 'null' if load fails
     */    
    public static ImageIcon getResourceImageIcon(String strFilepath) {
        ClassLoader loader = null;
        URL url = null;
        Image img=null;
        ImageIcon imgIcon=null;
        loader = ImageButtonDlg.class.getClassLoader();
        System.out.println(loader.toString());
        try {  // file location: <a relative path>
            url = loader.getResource("images/"+strFilepath);
            if(url==null) {
                System.out.printf("ImageButtonDlg.class.getResource(%s)=>null\n", "images/"+strFilepath);
            }
        } catch (Exception e0) {
            e0.printStackTrace();
        }
        if(url==null) {
            try {  // file location: <image filename>
                url = loader.getResource(strFilepath);
                if(url==null) { 
                    System.out.printf("Util.class.getResource(%s)=>null\n", strFilepath);
                }
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }
        try {
            img = ImageIO.read(url);
        } catch (Exception e2) {
            e2.printStackTrace();
            System.exit(0);
        }
        if (img!=null){
            imgIcon = new ImageIcon(img);
        }
        return imgIcon;
    }
    /**
     * Create JButton with Image
     * In case Image load fails, we create a JButton with text
     * @param strImgPath - path to Image
     * @param strAltText - fall-back text
     * @return
     */
    public static JButton getNewJButtonWithImageIcon(String strImgPath, String strAltText) {
        JButton btnReturn = null;
        ImageIcon imgIcon = getResourceImageIcon(strImgPath);
        if (imgIcon!=null){
            btnReturn = new JButton(imgIcon);
        }
        else {
            btnReturn = new JButton(strAltText);
        }
        return btnReturn;
    }
    /**
     * Image button was pressed, display a message box
     */
    private void actionImageButtonPressed() {
        try {
            JOptionPane.showMessageDialog(null, "Image Button was pressed", "Info", JOptionPane.INFORMATION_MESSAGE);
        }
        catch (Exception e) {
            ; // ignore
        }
    }
    /**
     * Initialize the dialog
     * add a button panel and the image button to the window/content pane
     */
    private void initializeDialog()
    {
        this.setTitle("Image Button Example");
        this.setResizable(false);
        this.setBounds(200, 200, 699, 601);
        JPanel panelButton = new JPanel();
        panelButton.setLayout(new FlowLayout(FlowLayout.RIGHT)); // all buttons in a row
        getContentPane().add(panelButton, BorderLayout.SOUTH); // button pane at the bottom of the window
        // create the Image Button
        JButton btnImageButton = getNewJButtonWithImageIcon(gstrImgUp, gstrTxt);
        btnImageButton.setToolTipText("<Explain what pressing the Button does>");
        btnImageButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                actionImageButtonPressed();// The Action
            }
        });
        // load button image when button clicked/released
        btnImageButton.addMouseListener((MouseListener) new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                btnImageButton.setIcon(getResourceImageIcon(gstrImgDown));              
            }
            public void mouseReleased(MouseEvent e) {
                btnImageButton.setIcon(getResourceImageIcon(gstrImgUp));
            }
        });
        btnImageButton.setActionCommand("ImageButtonAction");
        // add button to button panel
        panelButton.add(btnImageButton);
    }
}

玩得开心！
Volker Fröhlich
P.S.:
也许有人可以分享额外的实践经验。

• 在Eclipse的“WindowBuilder编辑器”中，这样的图像按钮会显示出来，但无法访问 - 是否有解决方法？
  
• NetBeans的方法是否有所不同？