怎么使用.ico文件呀？

Question

说实在的
我还没有见过用ICO文件的呢

Answer 1

ico格式好像不支持。。我们一般都转为.jpg或gif用。也up一下。。

Answer 2

jb-->help:
An implementation of the Icon interface that paints Icons from Images. Images that are created from a URL or filename are preloaded using MediaTracker to monitor the loaded state of the imageMany Swing components, such as labels, buttons, and tabbed panes, can be decorated with an icon — a fixed-sized picture. An icon is an object that adheres to the Icon interface. Swing provides a particularly useful implementation of the Icon interface: ImageIcon, which paints an icon from a GIF, JPEG, or (as of 1.3) PNG image. sample:ImageIcon icon = createImageIcon("images/middle.gif",
                                 "a pretty but meaningless splat");
label1 = new JLabel("Image and Text", icon, JLabel.CENTER);
...
label3 = new JLabel(icon);
自己试一试

Answer 3

这是jb中一个完整的文件：
/*The code that follows creates the four arrow image icons and attaches them to the two buttons. */
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.URL;
import java.util.Vector;
import java.util.StringTokenizer;/* 
 * IconDemoApplet.java requires the following files:
 *    SwingWorker.java
 *    Photo.java
 *    images/right.gif
 *    images/left.gif
 *    images/dimmedRight.gif
 *    images/dimmedLeft.gif
 *
 *  An applet tag for using it is in
 *  http://java.sun.com/docs/books/tutorial/uiswing/misc/IconDemoApplet.atag
 *  It refers to the following files:
 *    images/stickerface.gif
 *    images/lainesTongue.gif
 *    images/kathyCosmo.gif
 *    images/ewanPumpkin.gif
 */    
public class IconDemoApplet extends JApplet 
                            implements ActionListener {
    Vector pictures;    JButton previousButton;
    JButton nextButton;
    JLabel photographLabel;
    JLabel captionLabel;
    JLabel numberLabel;    int current = 0;
    int widthOfWidest = 0;
    int heightOfTallest = 0;    String imagedir = null;    public void init() {
        //Parse the applet parameters.
        pictures = parseParameters();        //If the applet tag doesn't provide an "IMAGE0" parameter,
        //display an error message.
        if (pictures.size() == 0) {
            captionLabel = new JLabel("No images listed in applet tag.");
            captionLabel.setHorizontalAlignment(JLabel.CENTER);
            getContentPane().add(captionLabel);
            return;
        }        //NOW CREATE THE GUI COMPONENTS        //A label to identify XX of XX.
        numberLabel = new JLabel("Picture " + (current+1) +
                                 " of " + pictures.size());
        numberLabel.setHorizontalAlignment(JLabel.LEFT);
        numberLabel.setBorder(BorderFactory.createEmptyBorder(5, 0, 5, 5));        //A label for the caption.
        final Photo first = (Photo)pictures.firstElement();
        captionLabel = new JLabel(first.caption);
        captionLabel.setHorizontalAlignment(JLabel.CENTER);
        captionLabel.setBorder(BorderFactory.createEmptyBorder(5, 0, 5, 0));        //A label for displaying the photographs.
        photographLabel = new JLabel("Loading first image...");
        photographLabel.setHorizontalAlignment(JLabel.CENTER);
        photographLabel.setVerticalAlignment(JLabel.CENTER);
        photographLabel.setVerticalTextPosition(JLabel.CENTER);
        photographLabel.setHorizontalTextPosition(JLabel.CENTER);
        photographLabel.setBorder(BorderFactory.createCompoundBorder(
                        BorderFactory.createLoweredBevelBorder(),
                        BorderFactory.createEmptyBorder(5, 5, 5, 5)
        ));
        photographLabel.setBorder(BorderFactory.createCompoundBorder(
                        BorderFactory.createEmptyBorder(0, 0, 10, 0),
                        photographLabel.getBorder()
        ));

Answer 4

接上：
//Set the preferred size for the picture,
        //with room for the borders.
        Insets i = photographLabel.getInsets();
        photographLabel.setPreferredSize(new Dimension(
                            widthOfWidest+i.left+i.right,
                            heightOfTallest+i.bottom+i.top));        //Create the next and previous buttons.
        ImageIcon nextIcon = createAppletImageIcon("images/right.gif",
                                                   "a right arrow");
        ImageIcon dimmedNextIcon = createAppletImageIcon("images/dimmedRight.gif",
                                                         "a dimmed right arrow");
        ImageIcon previousIcon = createAppletImageIcon("images/left.gif",
                                                       "a left arrow");
        ImageIcon dimmedPreviousIcon = createAppletImageIcon("images/dimmedLeft.gif",
                                                             "a dimmed left arrow");        nextButton = new JButton("Next Picture", nextIcon);
        nextButton.setDisabledIcon(dimmedNextIcon);
        nextButton.setVerticalTextPosition(AbstractButton.CENTER);
        nextButton.setHorizontalTextPosition(AbstractButton.LEFT);
        nextButton.setMnemonic(KeyEvent.VK_N);
        nextButton.setActionCommand("next");
        nextButton.addActionListener(this);        previousButton = new JButton("Previous Picture", previousIcon);
        previousButton.setDisabledIcon(dimmedPreviousIcon);
        previousButton.setVerticalTextPosition(AbstractButton.CENTER);
        previousButton.setHorizontalTextPosition(AbstractButton.RIGHT);
        previousButton.setMnemonic(KeyEvent.VK_P);
        previousButton.setActionCommand("previous");
        previousButton.addActionListener(this);
        previousButton.setEnabled(false);        //Lay out the GUI.
        GridBagLayout layout = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();        Container contentPane = getContentPane();
        contentPane.setLayout(layout);        c.gridwidth = GridBagConstraints.REMAINDER;
        c.fill = GridBagConstraints.HORIZONTAL;
        layout.setConstraints(numberLabel, c);
        contentPane.add(numberLabel);        layout.setConstraints(captionLabel, c);
        contentPane.add(captionLabel);        c.gridwidth = GridBagConstraints.REMAINDER;
        c.fill = GridBagConstraints.BOTH;
        layout.setConstraints(photographLabel, c);
        contentPane.add(photographLabel);        c.gridwidth = GridBagConstraints.RELATIVE;
        c.fill = GridBagConstraints.HORIZONTAL;
        layout.setConstraints(previousButton, c);
        contentPane.add(previousButton);        c.gridwidth = GridBagConstraints.REMAINDER;
        layout.setConstraints(nextButton, c);
        contentPane.add(nextButton);        //Start loading the image for the first photograph now.
        //The loadImage method uses a SwingWorker
        //to load the image in a separate thread.
        loadImage(imagedir + first.filename, current);
    }    //User clicked either the next or the previous button.
    public void actionPerformed(ActionEvent e) {
        //Show loading message.
        photographLabel.setIcon(null);
        photographLabel.setText("Loading image...");        //Compute index of photograph to view.
        if (e.getActionCommand().equals("next")) {
            current += 1;
            if (!previousButton.isEnabled())
                previousButton.setEnabled(true);
            if (current == pictures.size() - 1)
                nextButton.setEnabled(false);
        } else {
            current -= 1;
            if (!nextButton.isEnabled())
                nextButton.setEnabled(true);
            if (current == 0)
                previousButton.setEnabled(false);
        }        //Get the photo object.
        Photo pic = (Photo)pictures.elementAt(current);        //Update the caption and number labels.
        captionLabel.setText(pic.caption);
        numberLabel.setText("Picture " + (current+1) +
                            " of " + pictures.size());        //Update the photograph.
        ImageIcon icon = pic.getIcon();
        if (icon == null) {     //haven't viewed this photo before
            loadImage(imagedir + pic.filename, current);
        } else {
            updatePhotograph(current, pic);
        }
    }