遗留问题：
win7 java.awt.TrayIcon的displayMessage方法没有生效，通知消息不能正常弹出。
许多桌面环境都有一个区域用于放置在后台运行的程序的图标，这些程序偶尔会将某些事件通知给用户。
在Windos中，这个区域称为系统托盘，而这些图标称托盘图标。
java.awt.SystemTray类是跨平台的通向系统托盘的渠道，与前面讨论过的Desktop类似，首先要调用静态的SystemTray.isSupported方法来检查Java平台是否支持系统托盘。如果支持则通过调用静态的getSystemTray方法来获取SystemTray的单例。
SystemTray类是取重要的方法是add，它使得可以添加一个TrayIcon实例，托盘图标有三个主要的属性：
（1）图标的图像
（2）当鼠标滑过图标时显示的工具提示
（3）当用户用鼠标右键点击图标时显示右键菜单
package swing.systemtray;
import java.awt.AWTException;
import java.awt.Image;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import javax.swing.Timer;
/*2015-7-8*/
public class SystemTrayTest {
public static void main(String[] args) {
if (!SystemTray.isSupported()) {
System.err.println("System tray is no supported");
return;
}
SystemTray tray = SystemTray.getSystemTray();
Image image = Toolkit.getDefaultToolkit().getImage("logo.jpg");
PopupMenu popup = new PopupMenu();
MenuItem exitItem = new MenuItem("Exit");
exitItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
popup.add(exitItem);
final TrayIcon trayIcon = new TrayIcon(image, "Your Fortune", popup);
trayIcon.setImageAutoSize(true);
trayIcon.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("click me");
trayIcon.displayMessage("How do I turn this off",
"Right-click on the fortune cookie and select exit",
TrayIcon.MessageType.INFO);
}
});
try {
tray.add(trayIcon);
} catch (AWTException e1) {
System.err.println("TrayIcon could not be added.");
return;
}
final List<String> fortunes = readFortunes();
Timer timer = new Timer(1000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int index = (int) (fortunes.size() * Math.random());
System.out.println("is "+index);
trayIcon.displayMessage("Your Fortune",
fortunes.get(index),
TrayIcon.MessageType.INFO);
}
});
timer.start();
}
private static List<String> readFortunes() {
List<String> fortunes = new ArrayList<String>();
String path = SystemTrayTest.class.getResource("/swing/systemtray/fortunes.txt").getPath();
try {
Scanner in = new Scanner(new File(path));
StringBuilder fortune = new StringBuilder();
while (in.hasNextLine()) {
String line = in.nextLine();
if (line.equals("%")) {
fortunes.add(fortune.toString());
fortune.setLength(0);
} else {
fortune.append(line);
fortune.append(" ");
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
System.out.println(fortunes.size());
System.out.println(fortunes);
return fortunes;
}
}
fortunes.txt
Y1000
Y1000,000
%
Y1000,000
Y1000,000,000
%
Y5000,000
Y5000,000,000
%
Y1000,000,000
Y1000,000,000,000
%
TrayIcon增加鼠标双击事件的监听：
trayIcon.setImageAutoSize(true);//如果托盘图标空间不够，那么图标将会被裁切
trayIcon.addMouseListener(new java.awt.event.MouseAdapter(){
@Override
public void mouseClicked(MouseEvent e) {
if(e.getClickCount()==2){
showInterface();
}
}
}
demo2:绘制图标：
package swing.systemtray;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Image;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.UIManager;
public class ActiveTray {
public static void main(String args[]) throws Exception {
if (SystemTray.isSupported() == false) {
System.err.println("No system tray available");
return;
}
final SystemTray tray = SystemTray.getSystemTray();
PropertyChangeListener propListener = new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
TrayIcon oldTray[] = (TrayIcon[]) evt.getOldValue();
TrayIcon newTray[] = (TrayIcon[]) evt.getNewValue();
System.out.println(oldTray.length + " / " + newTray.length);
}
};
tray.addPropertyChangeListener("trayIcons", propListener);
Icon icon = new BevelArrowIcon(BevelArrowIcon.UP, false, false);
Image image = iconToImage(icon);
PopupMenu popup = new PopupMenu();
MenuItem item = new MenuItem("Hello, World");
final TrayIcon trayIcon = new TrayIcon(image, "Tip Text", popup);
ActionListener menuActionListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
trayIcon.displayMessage("Good-bye", "Cruel World",
TrayIcon.MessageType.WARNING);
}
};
item.addActionListener(menuActionListener);
popup.add(item);
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
tray.remove(trayIcon);
}
};
trayIcon.addActionListener(actionListener);
tray.add(trayIcon);
}
static Image iconToImage(Icon icon) {
if (icon instanceof ImageIcon) {
return ((ImageIcon) icon).getImage();
} else {
int w = icon.getIconWidth();
int h = icon.getIconHeight();
GraphicsEnvironment ge =
GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gd.getDefaultConfiguration();
BufferedImage image = gc.createCompatibleImage(w, h);
Graphics2D g = image.createGraphics();
icon.paintIcon(null, g, 0, 0);
g.dispose();
return image;
}
}
static class BevelArrowIcon implements Icon {
public static final int UP = 0; // direction
public static final int DOWN = 1;
private static final int DEFAULT_SIZE = 16;
private Color edge1;
private Color edge2;
private Color fill;
private int size;
private int direction;
public BevelArrowIcon(int direction, boolean isRaisedView,
boolean isPressedView) {
if (isRaisedView) {
if (isPressedView) {
init(UIManager.getColor("controlLtHighlight"),
UIManager.getColor("controlDkShadow"),
UIManager.getColor("controlShadow"),
DEFAULT_SIZE, direction);
} else {
init(UIManager.getColor("controlHighlight"),
UIManager.getColor("controlShadow"),
UIManager.getColor("control"),
DEFAULT_SIZE, direction);
}
} else {
if (isPressedView) {
init(UIManager.getColor("controlDkShadow"),
UIManager.getColor("controlLtHighlight"),
UIManager.getColor("controlShadow"),
DEFAULT_SIZE, direction);
} else {
init(UIManager.getColor("controlShadow"),
UIManager.getColor("controlHighlight"),
UIManager.getColor("control"),
DEFAULT_SIZE, direction);
}
}
}
public BevelArrowIcon(Color edge1, Color edge2, Color fill,
int size, int direction) {
init(edge1, edge2, fill, size, direction);
}
@Override
public void paintIcon(Component c, Graphics g, int x, int y) {
switch (direction) {
case DOWN:
drawDownArrow(g, x, y);
break;
case UP:
drawUpArrow(g, x, y);
break;
}
}
@Override
public int getIconWidth() {
return size;
}
@Override
public int getIconHeight() {
return size;
}
private void init(Color edge1, Color edge2, Color fill,
int size, int direction) {
edge1 = Color.red;
edge2 = Color.blue;
this.edge1 = edge1;
this.edge2 = edge2;
this.fill = fill;
this.size = size;
this.direction = direction;
}
private void drawDownArrow(Graphics g, int xo, int yo) {
g.setColor(edge1);
g.drawLine(xo, yo, xo + size - 1, yo);
g.drawLine(xo, yo + 1, xo + size - 3, yo + 1);
g.setColor(edge2);
g.drawLine(xo + size - 2, yo + 1, xo + size - 1, yo + 1);
int x = xo + 1;
int y = yo + 2;
int dx = size - 6;
while (y + 1 < yo + size) {
g.setColor(edge1);
g.drawLine(x, y, x + 1, y);
g.drawLine(x, y + 1, x + 1, y + 1);
if (0 < dx) {
g.setColor(fill);
g.drawLine(x + 2, y, x + 1 + dx, y);
g.drawLine(x + 2, y + 1, x + 1 + dx, y + 1);
}
g.setColor(edge2);
g.drawLine(x + dx + 2, y, x + dx + 3, y);
g.drawLine(x + dx + 2, y + 1, x + dx + 3, y + 1);
x += 1;
y += 2;
dx -= 2;
}
g.setColor(edge1);
g.drawLine(xo + (size / 2), yo + size - 1, xo
+ (size / 2), yo + size - 1);
}
private void drawUpArrow(Graphics g, int xo, int yo) {
g.setColor(edge1);
int x = xo + (size / 2);
g.drawLine(x, yo, x, yo);
x--;
int y = yo + 1;
int dx = 0;
while (y + 3 < yo + size) {
g.setColor(edge1);
g.drawLine(x, y, x + 1, y);
g.drawLine(x, y + 1, x + 1, y + 1);
if (0 < dx) {
g.setColor(fill);
g.drawLine(x + 2, y, x + 1 + dx, y);
g.drawLine(x + 2, y + 1, x + 1 + dx, y + 1);
}
g.setColor(edge2);
g.drawLine(x + dx + 2, y, x + dx + 3, y);
g.drawLine(x + dx + 2, y + 1, x + dx + 3, y + 1);
x -= 1;
y += 2;
dx += 2;
}
g.setColor(edge1);
g.drawLine(xo, yo + size - 3, xo + 1, yo + size - 3);
g.setColor(edge2);
g.drawLine(xo + 2, yo + size - 2, xo + size - 1, yo + size - 2);
g.drawLine(xo, yo + size - 1, xo + size, yo + size - 1);
}
}
}
http://stackoverflow.com/questions/12667526/adding-jpopupmenu-to-the-trayicon