我正在尝试为基本的SUN（Oracle）Java Swing ImageIcon图库演示添加Web URL启动功能： http://docs.oracle.com/javase/tutorial/uiswing/components/icon.html#example
要求 目的是创建一个Swing GUI Web链接启动器，它能够使用JRE 1.6+ Desktop API启动器功能通过用户的默认Web浏览器启动链接，并根据上次单击的图像打开不同的URL。
问题 我似乎遇到的问题是每次在ThumbnailAction构造函数中创建一个新的ImageIcon时，它似乎都没有破坏以前的Image并只是在它上面绘画。不必要的副作用是旧图像的MouseListeners和元数据仍处于活动状态，因此尝试单击以启动URL实际上会加载先前加载的图像的URL以及当前对焦的图像的URL。如果您查看控制台打印日志，您还可以多次看到MouseEntered和Exited fire，对于目前已交换的每个图像，都会看一次。因此，如果用户进行3次或4次交换，他们将启动那么多URL。不是预期的效果。
如果有人知道问题是什么，我将不胜感激，以下是我对“IconDemoApp.java”文件的修改（更新2012-01-31）：
/*
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle or the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package components;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Desktop;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
import javax.swing.SwingWorker;
/**
* This application is intended to demonstrate the loading of image files into icons
* for use in a Swing user interface. It creates a toolbar with a thumbnail preview
* of each image. Clicking on the thumbnail will show the full image
* in the main display area.
*
* IconDemoApp.java requires the following files: <br>
* The following files are copyright 2006 spriggs.net and licensed under a
* Creative Commons License (http://creativecommons.org/licenses/by-sa/3.0/)
* <br>
* images/sunw01.jpg <br>
* images/sunw02.jpg <br>
* images/sunw03.jpg <br>
* images/sunw04.jpg <br>
* images/sunw05.jpg <br>
*
* @author Collin Fagan
* @date 7/25/2007
* @version 2.0
*/
public class IconDemoApp extends JFrame {
/**
* Main entry point to the demo. Loads the Swing elements on the "Event
* Dispatch Thread".
*
* @param args
*/
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
IconDemoApp app = new IconDemoApp();
app.setVisible(true);
}
});
}
/*
* MissingIcon
* Internal class for how to recover from missing icons.
* (displays empty image placeholder with red X and white background)
*/
class MissingIcon implements Icon {
private int width = 32;
private int height = 32;
private BasicStroke stroke = new BasicStroke(4);
public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(Color.WHITE);
g2d.fillRect(x +1 ,y + 1,width -2 ,height -2);
g2d.setColor(Color.BLACK);
g2d.drawRect(x +1 ,y + 1,width -2 ,height -2);
g2d.setColor(Color.RED);
g2d.setStroke(stroke);
g2d.drawLine(x +10, y + 10, x + width -10, y + height -10);
g2d.drawLine(x +10, y + height -10, x + width -10, y + 10);
g2d.dispose();
}
public int getIconWidth() {
return width;
}
public int getIconHeight() {
return height;
}
}
/**
* Default constructor for the demo.
*/
public IconDemoApp() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Icon Demo: Please Select an Image");
// A label for displaying the pictures
photographLabel.setVerticalTextPosition(JLabel.BOTTOM);
photographLabel.setHorizontalTextPosition(JLabel.CENTER);
photographLabel.setHorizontalAlignment(JLabel.CENTER);
photographLabel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
// We add two glue components. Later in process() we will add thumbnail buttons
// to the toolbar inbetween thease glue compoents. This will center the
// buttons in the toolbar.
buttonBar.add(Box.createGlue());
buttonBar.add(Box.createGlue());
add(buttonBar, BorderLayout.SOUTH);
add(photographLabel, BorderLayout.CENTER);
setSize(400, 300);
// this centers the frame on the screen
setLocationRelativeTo(null);
// start the image loading SwingWorker in a background thread
loadimages.execute();
}
/**
* SwingWorker class that loads the images a background thread and calls publish
* when a new one is ready to be displayed.
*
* We use Void as the first SwingWroker param as we do not need to return
* anything from doInBackground().
*/
private SwingWorker<Void, ThumbnailAction> loadimages = new SwingWorker<Void, ThumbnailAction>() {
/**
* Creates full size and thumbnail versions of the target image files.
*/
@Override
protected Void doInBackground() throws Exception {
for (int i = 0; i < titles.length; i++) {
ImageIcon icon;
icon = createImageIcon(imagedir + thumbs[i], titles[i]);
ThumbnailAction thumbAction;
if(icon != null){
ImageIcon thumbnailIcon = new ImageIcon(getScaledImage(icon.getImage(), 32, 32));
thumbAction = new ThumbnailAction(icon, thumbnailIcon, titles[i], descs[i], links[i]);
}else{
// the image failed to load for some reason
// so load a placeholder instead
thumbAction = new ThumbnailAction(placeholderIcon, placeholderIcon, titles[i], descs[i], links[i]);
}
publish(thumbAction);
}
// unfortunately we must return something, and only null is valid to
// return when the return type is void.
return null;
}
/**
* Process all loaded images.
*/
@Override
protected void process(List<ThumbnailAction> chunks) {
for (ThumbnailAction thumbAction : chunks) {
JButton thumbButton = new JButton(thumbAction);
// add the new button BEFORE the last glue
// this centers the buttons in the toolbar
buttonBar.add(thumbButton, buttonBar.getComponentCount() - 1);
}
}
};
/**
* Creates an ImageIcon if the path is valid.
* @param String - resource path
* @param String - description of the file
*/
protected ImageIcon createImageIcon(String path, String description) {
java.net.URL imgURL = getClass().getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL, description);
}
else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
/**
* Resizes an image using a Graphics2D object backed by a BufferedImage.
* @param srcImg - source image to scale
* @param w - desired width
* @param h - desired height
* @return - the new resized image
*/
private Image getScaledImage(Image srcImg, int w, int h) {
BufferedImage resizedImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = resizedImg.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(srcImg, 0, 0, w, h, null);
g2.dispose();
return resizedImg;
}
/**
* Action class that shows the image specified in it's constructor.
*/
private class ThumbnailAction extends AbstractAction implements MouseListener {
private Icon displayPhoto; // The icon if the full image we want to display.
/**
* @param Icon - The full size photo to show in the button.
* @param Icon - The thumbnail to show in the button.
* @param String - The descriptioon of the icon.
*/
public ThumbnailAction(Icon photo, Icon thumb, String title, String desc, String link) {
displayPhoto = photo;
// The short description becomes the title of the window.
putValue(SHORT_DESCRIPTION, title);
// The long description becomes the tooltip of a button.
putValue(LONG_DESCRIPTION, desc);
// The DEFAULT action on click is to launch this URL
putValue(DEFAULT, link);
// The LARGE_ICON_KEY is the key for setting the icon when an Action is applied to a button.
putValue(LARGE_ICON_KEY, thumb);
}
/**
* Shows the full image in the main area and sets the application title.
*/
public void actionPerformed(ActionEvent e) {
photographLabel.setIcon(displayPhoto);
setTitle("Icon Demo - " + getValue(SHORT_DESCRIPTION).toString());
photographLabel.setToolTipText("<html>" + getValue(LONG_DESCRIPTION) + "</html>");
photographLabel.validate();
photographLabel.updateUI();
photographLabel.repaint();
photographLabel.addMouseListener(this);
}
/**
* Listen for clicks to send user to a URL or launch an application
* @param e
*/
@Override
public void mouseClicked(MouseEvent e) {
int clicked = e.getClickCount();
if (clicked > 0) {
/*************************************/
/* Code for launching Browser BEGIN */
Desktop desktop = null;
if (Desktop.isDesktopSupported()) {
desktop = Desktop.getDesktop();
}
URI uri = null;
try {
uri = new URI((String)this.getValue(DEFAULT)); //pass the URL from ImageIcon to Browser
if (desktop.isSupported(Desktop.Action.BROWSE)) {
desktop.browse(uri); //url passed
}
else {
System.out.println("Unable to open default browser to: "+uri);
}
}
catch(IOException ioe) {
ioe.printStackTrace();
}
catch(URISyntaxException use) {
use.printStackTrace();
}
/* Code for launching Browser END */
/*************************************/
}
else {
System.out.println("Clicked: " + clicked);
}
}
@Override
public void mousePressed(MouseEvent e) {
System.out.println("Mouse pressed (# of clicks: " + e.getClickCount() + ") " + e);
}
@Override
public void mouseReleased(MouseEvent e) {
System.out.println("Mouse released (# of clicks: " + e.getClickCount() + ") " + e);
}
@Override
public void mouseEntered(MouseEvent e) {
System.out.println("Mouse entered: " + e);
}
@Override
public void mouseExited(MouseEvent e) {
System.out.println("Mouse exited: " + e);
}
}
private JLabel photographLabel = new JLabel();
private JToolBar buttonBar = new JToolBar();
private String imagedir = "images/";
private MissingIcon placeholderIcon = new MissingIcon();
// List of all the image files to load.
private String[] thumbs = { "sunw01.jpg", "sunw02.jpg", "sunw03.jpg", "sunw04.jpg", "sunw05.jpg"};
// List of all the descriptions of the image files. These correspond one to one with the image file names
private String[] titles = { "SunLogo", "Clocktower", "ClocktowerWest", "Mansion", "SunAuditorium" };
// List of all descriptions (descs) to use as tooltips.
private String[] descs = { "The Original SUNW Logo", "The Clocktower frontal view", "The Clocktower from the West", "The Mansion on the hill!", "The infamouse Sun campus auditorium"};
// List of all links to send a user to on click action.
private String[] links = { "http://example.com/#1", "http://example.com/#2", "http://example.com/#3", "http://example.com/#4", "http://example.com/#5"};
}
答案 0 :(得分：1)
1）我无法生成您的问题，因为这种描述可以讨论un_healt GPU驱动程序
2）但是你可以通过减少从最快的绘画中使用flush（）的辅助问题来测试，并且以下步骤可以帮助你
创建Icon
myIcon.getImage().flush();
将Icon添加到JLabel
myLabel.setIcon(myIcon);
答案 1 :(得分：1)
设置图像不是问题。但是当执行一个Action时，你将一个MouseListener添加到你在第267行中永远不会删除的photographLabel。这个例子的一个简单的黑客就是在添加新的一个之前删除所有已注册的Listener：
for(MouseListener listener : photographLabel.getMouseListeners()) {
photographLabel.removeMouseListener(listener);
}
photographLabel.addMouseListener(this);
现在一切都按预期进行。