我尝试从docs.oracle.com运行示例程序。
TrayIconDemo.java
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package misc;
/*
* TrayIconDemo.java
*/
import java.awt.*;
import java.awt.event.*;
import java.net.URL;
import javax.swing.*;
public class TrayIconDemo {
public static void main(String[] args) {
/* Use an appropriate Look and Feel */
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
//UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
} catch (UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (InstantiationException ex) {
ex.printStackTrace();
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
}
/* Turn off metal's use of bold fonts */
UIManager.put("swing.boldMetal", Boolean.FALSE);
//Schedule a job for the event-dispatching thread:
//adding TrayIcon.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
private static void createAndShowGUI() {
//Check the SystemTray support
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
return;
}
final PopupMenu popup = new PopupMenu();
final TrayIcon trayIcon =
new TrayIcon(createImage("images/bulb.gif", "tray icon"));
final SystemTray tray = SystemTray.getSystemTray();
// Create a popup menu components
MenuItem aboutItem = new MenuItem("About");
CheckboxMenuItem cb1 = new CheckboxMenuItem("Set auto size");
CheckboxMenuItem cb2 = new CheckboxMenuItem("Set tooltip");
Menu displayMenu = new Menu("Display");
MenuItem errorItem = new MenuItem("Error");
MenuItem warningItem = new MenuItem("Warning");
MenuItem infoItem = new MenuItem("Info");
MenuItem noneItem = new MenuItem("None");
MenuItem exitItem = new MenuItem("Exit");
//Add components to popup menu
popup.add(aboutItem);
popup.addSeparator();
popup.add(cb1);
popup.add(cb2);
popup.addSeparator();
popup.add(displayMenu);
displayMenu.add(errorItem);
displayMenu.add(warningItem);
displayMenu.add(infoItem);
displayMenu.add(noneItem);
popup.add(exitItem);
trayIcon.setPopupMenu(popup);
try {
tray.add(trayIcon);
} catch (AWTException e) {
System.out.println("TrayIcon could not be added.");
return;
}
trayIcon.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,
"This dialog box is run from System Tray");
}
});
aboutItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,
"This dialog box is run from the About menu item");
}
});
cb1.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
int cb1Id = e.getStateChange();
if (cb1Id == ItemEvent.SELECTED){
trayIcon.setImageAutoSize(true);
} else {
trayIcon.setImageAutoSize(false);
}
}
});
cb2.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
int cb2Id = e.getStateChange();
if (cb2Id == ItemEvent.SELECTED){
trayIcon.setToolTip("Sun TrayIcon");
} else {
trayIcon.setToolTip(null);
}
}
});
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
MenuItem item = (MenuItem)e.getSource();
//TrayIcon.MessageType type = null;
System.out.println(item.getLabel());
if ("Error".equals(item.getLabel())) {
//type = TrayIcon.MessageType.ERROR;
trayIcon.displayMessage("Sun TrayIcon Demo",
"This is an error message", TrayIcon.MessageType.ERROR);
} else if ("Warning".equals(item.getLabel())) {
//type = TrayIcon.MessageType.WARNING;
trayIcon.displayMessage("Sun TrayIcon Demo",
"This is a warning message", TrayIcon.MessageType.WARNING);
} else if ("Info".equals(item.getLabel())) {
//type = TrayIcon.MessageType.INFO;
trayIcon.displayMessage("Sun TrayIcon Demo",
"This is an info message", TrayIcon.MessageType.INFO);
} else if ("None".equals(item.getLabel())) {
//type = TrayIcon.MessageType.NONE;
trayIcon.displayMessage("Sun TrayIcon Demo",
"This is an ordinary message", TrayIcon.MessageType.NONE);
}
}
};
errorItem.addActionListener(listener);
warningItem.addActionListener(listener);
infoItem.addActionListener(listener);
noneItem.addActionListener(listener);
exitItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
tray.remove(trayIcon);
System.exit(0);
}
});
}
//Obtain the image URL
protected static Image createImage(String path, String description) {
URL imageURL = TrayIconDemo.class.getResource(path);
if (imageURL == null) {
System.err.println("Resource not found: " + path);
return null;
} else {
return (new ImageIcon(imageURL, description)).getImage();
}
}
}
该程序需要bulb.gif文件，这里是bulb.gif https://docs.oracle.com/javase/tutorial/uiswing/examples/misc/TrayIconDemoProject/src/misc/images/bulb.gif的链接。我已经创建了包含bulb.gif的图像文件夹。但为什么我每次运行程序时都会说
Resource not found: images/bulb.gif
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: creating TrayIcon with null Image
at java.awt.TrayIcon.<init>(Unknown Source)
at TrayIconDemo.createAndShowGUI(TrayIconDemo.java:76)
at TrayIconDemo.access$0(TrayIconDemo.java:68)
at TrayIconDemo$1.run(TrayIconDemo.java:63)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
我正在使用Windows 7 64位
我认为这里的问题是：
final TrayIcon trayIcon =
new TrayIcon(createImage("images/bulb.gif", "tray icon"));
这是我的项目结构 https://farm8.staticflickr.com/7491/15300162233_cdda5e541d_o.png
解决方案 1.将.java文件放在默认包中/没有任何包 2.然后你应该在src文件夹中创建图像文件夹并将bulb.gif放在那里，这样你就可以通过类型images / bulb.gif访问它了。 感谢jitesh
答案 0 :(得分：0)
错误行期待图像在相对于eclipse运行此程序的文件夹的图像文件夹内。
final TrayIcon trayIcon =
new TrayIcon(createImage("images/bulb.gif", "tray icon"));
检查eclipse创建类的位置。您可以通过查看项目属性找到它。 在该目录中创建图像文件夹并复制图像文件。
另一个解决方案（不是那么漂亮）将把函数调用更改为： -
final TrayIcon trayIcon =
new TrayIcon(createImage("C:\\Users\\azura\\workspace_intermediate_java_third\\azura\\images\\bulb.gif", "tray icon"));