我使用Swing创建了简单的表单。在这个表单中，我有2个名为username和password的字段。
在第一行中，我将标题设置为“登录”。如何使用自定义图像替换左侧的图标？
class LoginForm extends JFrame {
public static boolean flag = false;
JButton login, cancel;
JTextField uname;
JPasswordField pass;
JLabel u, p;
final CheckUser user = new CheckUser();
private static final Insets insets = new Insets(0, 0, 0, 0);
private static ArrayList<JavaBean> store = new ArrayList<JavaBean>();
JavaBean bean = new JavaBean();
ArrayList<JavaBean> list = new ArrayList<JavaBean>();
int n = 0;
public void login() {
setTitle("Login");
setLayout(new GridLayout(3, 2));
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
u = new JLabel("Username");
p = new JLabel("Password");
uname = new JTextField(20);
pass = new JPasswordField(20);
login = new JButton("Login");
cancel = new JButton("Cancel");
add(u);
add(uname);
add(p);
add(pass);
add(login);
add(cancel);
uname.requestFocus();
cancel.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
System.exit(0);
}
});
login.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
String un = uname.getText();
String pa = new String(pass.getPassword());
// JavaBean bean = new JavaBean();
bean.setUsername(un);
bean.setPassword(pa);
System.out.println("Username :" + un + pa);
store.add(bean);
setList(store);
dispose();
//boolean checkUser = user.checkUser(un, pa, "https://greenhouse.lotus.com/connections/opensocial/basic/rest/activitystreams/@me/@mentions/@all?shortStrings=true&format=atom");
boolean checkUser = user.checkUser(un, pa, "https://greenhouse.lotus.com/connections/opensocial/basic/rest/activitystreams/@me/@responses/@all?shortStrings=true&format=atom");
if (checkUser) {
System.out.println("------------getData");
System.out.println("Check User Boolean!!!" + checkUser);
try {
final TrayIcon icon = new TrayIcon(createImage("socail.png", "tray icon"), "Connections Notifications");
final SystemTray tray = SystemTray.getSystemTray();
tray.add(icon);
final PopupMenu popup = new PopupMenu();
MenuItem view = new MenuItem("View");
MenuItem setting = new MenuItem("Settings");
MenuItem logout = new MenuItem("Logout");
popup.add(view);
popup.addSeparator();
popup.add(setting);
popup.addSeparator();
popup.add(logout);
icon.setPopupMenu(popup);
setting.addActionListener(new ActionListener() {
// private ArrayList<LoginBean> loginstore;
@Override
public void actionPerformed(ActionEvent e) {
new SettingForm();
}
});
logout.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
System.out.println("Haiii For 10 Sec");
icon.displayMessage("Hello", "Please click here", TrayIcon.MessageType.INFO);
icon.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null, "Hey, you activated me!");
}
});
ArrayList<JavaBean> list = user.getList();
Iterator itr = list.iterator();
System.out.println("Size!!!" + list.size());
while (itr.hasNext()) {
Object element = itr.next();
bean = (JavaBean) element;
System.out.print("---->" + bean.getTime());
System.out.print("---->" + bean.getTitle());
System.out.println("----->" + bean.getUrl());
final URI uri = new URI(bean.getUrl());
final JFrame frame = new JFrame();
frame.setSize(350, 70);
frame.add(new JSeparator(SwingConstants.HORIZONTAL));
frame.setAlwaysOnTop(true);
frame.setUndecorated(true);
frame.setLayout(new GridBagLayout());
// frame.add(new JLabel(new ImageIcon("socail.png")));
JButton cloesButton = new JButton("X");
JButton linkbutton = new JButton("links");
addComponent(frame, linkbutton, 0, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.BOTH);
addComponent(frame, cloesButton, 1, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.BOTH);
linkbutton.setText("<HTML><div style='width:200px; color:#000; border:1px solid #e5e5e5; margin-right:5px; '>"
+ bean.getTitle() + "</div>" + "</HTML>");
linkbutton.setBackground(Color.LIGHT_GRAY);
linkbutton.setHorizontalAlignment(SwingConstants.LEFT);
cloesButton.setFocusable(false);
linkbutton.setToolTipText(uri.toString());
JPanel panel = new JPanel();
JScrollPane scrollPane = new JScrollPane(panel);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
panel.add(cloesButton, linkbutton);
//frame.add(panel);
frame.add(scrollPane);
frame.pack();
//frame.add(linkbutton);
// frame.add(cloesButton);
frame.setVisible(true);
//Set Pop up at bottom - right
Dimension scrSize = Toolkit.getDefaultToolkit().getScreenSize();// size of the screen
Insets toolHeight = Toolkit.getDefaultToolkit().getScreenInsets(frame.getGraphicsConfiguration());// height of the task bar
//frame.setLocation(scrSize.width - frame.getWidth(), scrSize.height - toolHeight.bottom - frame.getHeight());
frame.setLocation(scrSize.width - frame.getWidth(), scrSize.height - toolHeight.bottom - (frame.getHeight() * (n + 1)));
n++;
linkbutton.addActionListener(new AbstractAction("links") {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("i am in link");
open(uri);
}
private void open(URI uri) {
if (Desktop.isDesktopSupported()) {
try {
Desktop.getDesktop().browse(uri);
} catch (IOException e) {
}
}
}
});
//Close Button
cloesButton.addActionListener(new AbstractAction("x") {
@Override
public void actionPerformed(final ActionEvent e) {
try {
frame.dispose();
Thread.sleep(1000);
} catch (InterruptedException ex) {
Logger.getLogger(LoginForm.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
} catch (Exception e) {
}
} else {
System.out.println("------------NoData");
new WelcomeFrame();
}
private void addComponent(JFrame frame, JButton linkbutton, int gridx, int gridy, int gridwidth, int gridheight, int anchor, int fill) {
GridBagConstraints gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0, 1.0, anchor, fill, insets, 0, 0);
frame.add(linkbutton, gbc);
}
});
KeyAdapter k = new KeyAdapter() {
@Override
public void keyPressed(KeyEvent ke) {
if (ke.getKeyCode() == KeyEvent.VK_ENTER) {
login.doClick();
}
}
};
pass.addKeyListener(k);
uname.addKeyListener(k);
pack();
setLocationRelativeTo(null);
}
/**
* @return the loginstore
*/
public static ArrayList<JavaBean> getList() {
return store;
}
/**
* @param loginstore the loginstore to set
*/
public static void setList(ArrayList<JavaBean> store) {
LoginForm.store = store;
}
// Notification Panel
public class NotificationPanel extends JPanel {
public NotificationPanel() {
System.out.println("I am in notication Class!!!");
}
}
class WelcomeFrame extends JFrame {
public WelcomeFrame() {
JOptionPane.showMessageDialog(WelcomeFrame.this, "Invalid username or password", "Login",
JOptionPane.ERROR_MESSAGE);
new LoginForm();
// reset username and password
}
}
protected static Image createImage(String path, String description) {
URL imageURL = Notifications.class.getResource(path);
if (imageURL == null) {
System.err.println("Resource not found: " + path);
return null;
} else {
return (new ImageIcon(imageURL, description)).getImage();
}
}
}
答案 0 :(得分：3)
您可以使用JFrame#setIconImage自定义图标的图标，或者更喜欢Window#setIconImages，这样您就可以提供不同尺寸的图像列表，系统可以使用这些图像做出决策哪个图像用于屏幕和任务栏/停靠点和其他可视元素
我也将setVisible(true);移动到你做的最后一次通话，因为它会影响UI在某些系统上的显示方式（缺少组件）
答案 1 :(得分：2)
您可以使用方法setIcon（图标图标），图标将显示在标签附近。
public void setIcon（Icon icon）定义此组件的图标 显示。如果icon的值为null，则不显示任何内容。该 此属性的默认值为null。
这是一个JavaBeans绑定属性。