import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.*; import java.awt.*;public class MessageBox implements Runnable, ActionListener, WindowListener, KeyListener { // ---------- Private Fields ------------------------------ private ActionListener listener; private JDialog dialog; private String closeWindowCommand = "CloseRequested"; private String title; private JFrame frame; private boolean frameNotProvided; private JPanel buttonPanel = new JPanel(); // ---------- Initialization ------------------------------ /** * This convenience constructor is used to delare the listener that will be * notified when a button is clicked. The listener must implement * ActionListener. */ public MessageBox(ActionListener listener) { this(); this.listener = listener; } /** * This constructor is used for no listener, such as for a simple okay * dialog. */ public MessageBox() { } // Unit test. Shows only simple features. public static void main(String args[]) { MessageBox box = new MessageBox(); box.setTitle("Test MessageBox"); box.askYesNo("Tell me now.\nDo you like Java?"); } // ---------- Runnable Implementation --------------------- /** * This prevents the caller from blocking on ask(), which if this class is * used on an awt event thread would cause a deadlock. */ public void run() { dialog.setVisible(true); } // ---------- ActionListener Implementation --------------- public void actionPerformed(ActionEvent evt) { dialog.setVisible(false); dialog.dispose(); if (frameNotProvided) frame.dispose(); if (listener != null) { listener.actionPerformed(evt); } } // ---------- WindowListener Implementatons --------------- public void windowClosing(WindowEvent evt) { // User clicked on X or chose Close selection fireCloseRequested(); } public void windowClosed(WindowEvent evt) { } public void windowDeiconified(WindowEvent evt) { } public void windowIconified(WindowEvent evt) { } public void windowOpened(WindowEvent evt) { } public void windowActivated(WindowEvent evt) { } public void windowDeactivated(WindowEvent evt) { } // ---------- KeyListener Implementation ------------------ public void keyTyped(KeyEvent evt) { } public void keyPressed(KeyEvent evt) { if (evt.getKeyCode() == KeyEvent.VK_ESCAPE) { fireCloseRequested(); } } public void keyReleased(KeyEvent evt) { } private void fireCloseRequested() { ActionEvent event = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, closeWindowCommand); actionPerformed(event); } // ---------- Public Methods ------------------------------ /** * This set the listener to be notified of button clicks and WindowClosing * events. */ public void setActionListener(ActionListener listener) { this.listener = listener; } public void setTitle(String title) { this.title = title; } /** * If a Frame is provided then it is used to instantiate the modal Dialog. * Otherwise a temporary Frame is used. Providing a Frame will have the * effect of putting the focus back on that Frame when the MessageBox is * closed or a button is clicked. */ public void setFrame(JFrame frame) { // Optional this.frame = frame; } /** * Sets the ActionCommand used in the ActionEvent when the user attempts to * close the window. The window may be closed by clicking on "X", choosing * Close from the window menu, or pressing the Escape key. The default * command is "CloseRequested", which is just what a Close choice button * would probably have as a command. */ public void setCloseWindowCommand(String command) { closeWindowCommand = command; } /** * The * * @param label * will be used for the button and the * @param command * will be returned to the listener. */ public void addChoice(String label, String command) { JButton button = new JButton(label); button.setActionCommand(command); button.addActionListener(this); button.addKeyListener(this);
buttonPanel.add(button); } /** * A convenience method that assumes the command is the same as the label. */ public void addChoice(String label) { addChoice(label, label); } /** * One of the "ask" methods must be the last call when using a MessageBox. * This is the simplest "ask" method. It presents the provided * * @param message. */ public void ask(String message) { if (frame == null) { frame = new JFrame(); frameNotProvided = true; } else { frameNotProvided = false; } dialog = new JDialog(frame, true); // Modal dialog.addWindowListener(this); dialog.addKeyListener(this); dialog.setTitle(title); dialog.setLayout(new BorderLayout(5, 5)); JPanel messagePanel = createMultiLinePanel(message); JPanel centerPanel = new JPanel(); centerPanel.add(messagePanel); dialog.add("Center", centerPanel); dialog.add("South", buttonPanel); dialog.pack(); enforceMinimumSize(dialog, 200, 100); centerWindow(dialog); Toolkit.getDefaultToolkit().beep(); // Start a new thread to show the dialog Thread thread = new Thread(this); thread.start(); } /** * Same as ask(String message) except adds an "Okay" button. */ public void askOkay(String message) { addChoice("Okay"); ask(message); } /** * Same as ask(String message) except adds "Yes" and "No" buttons. */ public void askYesNo(String message) { addChoice("Yes"); addChoice("No"); ask(message); } // ---------- Private Methods ----------------------------- private JPanel createMultiLinePanel(String message) { JPanel mainPanel = new JPanel(); GridBagLayout gbLayout = new GridBagLayout(); mainPanel.setLayout(gbLayout); addMultilineString(message, mainPanel); return mainPanel; } // There are a variaty of ways to do this.... private void addMultilineString(String message, Container container) { GridBagConstraints constraints = getDefaultConstraints(); constraints.gridwidth = GridBagConstraints.REMAINDER; // Insets() args are top, left, bottom, right constraints.insets = new Insets(0, 0, 0, 0); GridBagLayout gbLayout = (GridBagLayout) container.getLayout(); while (message.length() > 0) { int newLineIndex = message.indexOf('\n'); String line; if (newLineIndex >= 0) { line = message.substring(0, newLineIndex); message = message.substring(newLineIndex + 1); } else { line = message; message = ""; } JLabel label = new JLabel(line); gbLayout.setConstraints(label, constraints); container.add(label); } } private GridBagConstraints getDefaultConstraints() { GridBagConstraints constraints = new GridBagConstraints(); constraints.weightx = 1.0; constraints.weighty = 1.0; constraints.gridheight = 1; // One row high // Insets() args are top, left, bottom, right constraints.insets = new Insets(4, 4, 4, 4); // fill of NONE means do not change size constraints.fill = GridBagConstraints.NONE; // WEST means align left constraints.anchor = GridBagConstraints.WEST; return constraints; } private void centerWindow(JDialog win) { Dimension screenDim = Toolkit.getDefaultToolkit().getScreenSize(); // If larger than screen, reduce window width or height if (screenDim.width < win.getSize().width) { win.setSize(screenDim.width, win.getSize().height); } if (screenDim.height < win.getSize().height) { win.setSize(win.getSize().width, screenDim.height); } // Center Frame, Dialogue or Window on screen int x = (screenDim.width - win.getSize().width) / 2; int y = (screenDim.height - win.getSize().height) / 2; win.setLocation(x, y); } private void enforceMinimumSize(JDialog comp, int minWidth, int minHeight) { if (comp.getSize().width < minWidth) { comp.setSize(minWidth, comp.getSize().height); } if (comp.getSize().height < minHeight) { comp.setSize(comp.getSize().width, minHeight); } }} // End class在调用它的WindowsMain类里添加一个Close按钮，点击Close按钮时调用MessageBox选择yes或no。 jCloseButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent e) { //System.out.println("actionPerformed()"); // TODO Auto-generated Event stub actionPerformed() MessageBox box = new MessageBox(); box.setTitle("Warning"); box.askYesNo("Do you really want to exit?"); //添加MessageBox的按钮事件Listener。 box.setActionListener(new java.awt.event.ActionListener(){ public void actionPerformed(java.awt.event.ActionEvent e){ JButton button=(JButton)e.getSource(); if(button.getText()=="Yes") System.exit(0); } } ); } });
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.*;
import java.awt.*;public class MessageBox implements Runnable, ActionListener, WindowListener,
KeyListener { // ---------- Private Fields ------------------------------
private ActionListener listener; private JDialog dialog; private String closeWindowCommand = "CloseRequested"; private String title; private JFrame frame; private boolean frameNotProvided; private JPanel buttonPanel = new JPanel();
// ---------- Initialization ------------------------------
/**
* This convenience constructor is used to delare the listener that will be
* notified when a button is clicked. The listener must implement
* ActionListener.
*/
public MessageBox(ActionListener listener) {
this();
this.listener = listener;
} /**
* This constructor is used for no listener, such as for a simple okay
* dialog.
*/
public MessageBox() {
} // Unit test. Shows only simple features.
public static void main(String args[]) {
MessageBox box = new MessageBox();
box.setTitle("Test MessageBox");
box.askYesNo("Tell me now.\nDo you like Java?");
} // ---------- Runnable Implementation ---------------------
/**
* This prevents the caller from blocking on ask(), which if this class is
* used on an awt event thread would cause a deadlock.
*/
public void run() {
dialog.setVisible(true);
} // ---------- ActionListener Implementation ---------------
public void actionPerformed(ActionEvent evt) {
dialog.setVisible(false);
dialog.dispose();
if (frameNotProvided)
frame.dispose();
if (listener != null) {
listener.actionPerformed(evt);
}
} // ---------- WindowListener Implementatons ---------------
public void windowClosing(WindowEvent evt) {
// User clicked on X or chose Close selection
fireCloseRequested();
} public void windowClosed(WindowEvent evt) {
} public void windowDeiconified(WindowEvent evt) {
} public void windowIconified(WindowEvent evt) {
} public void windowOpened(WindowEvent evt) {
} public void windowActivated(WindowEvent evt) {
} public void windowDeactivated(WindowEvent evt) {
} // ---------- KeyListener Implementation ------------------
public void keyTyped(KeyEvent evt) {
} public void keyPressed(KeyEvent evt) {
if (evt.getKeyCode() == KeyEvent.VK_ESCAPE) {
fireCloseRequested();
}
} public void keyReleased(KeyEvent evt) {
} private void fireCloseRequested() {
ActionEvent event = new ActionEvent(this, ActionEvent.ACTION_PERFORMED,
closeWindowCommand);
actionPerformed(event);
} // ---------- Public Methods ------------------------------
/**
* This set the listener to be notified of button clicks and WindowClosing
* events.
*/
public void setActionListener(ActionListener listener) {
this.listener = listener;
} public void setTitle(String title) {
this.title = title;
} /**
* If a Frame is provided then it is used to instantiate the modal Dialog.
* Otherwise a temporary Frame is used. Providing a Frame will have the
* effect of putting the focus back on that Frame when the MessageBox is
* closed or a button is clicked.
*/
public void setFrame(JFrame frame) { // Optional
this.frame = frame;
} /**
* Sets the ActionCommand used in the ActionEvent when the user attempts to
* close the window. The window may be closed by clicking on "X", choosing
* Close from the window menu, or pressing the Escape key. The default
* command is "CloseRequested", which is just what a Close choice button
* would probably have as a command.
*/
public void setCloseWindowCommand(String command) {
closeWindowCommand = command;
} /**
* The
*
* @param label
* will be used for the button and the
* @param command
* will be returned to the listener.
*/
public void addChoice(String label, String command) {
JButton button = new JButton(label);
button.setActionCommand(command);
button.addActionListener(this);
button.addKeyListener(this);
buttonPanel.add(button);
} /**
* A convenience method that assumes the command is the same as the label.
*/
public void addChoice(String label) {
addChoice(label, label);
} /**
* One of the "ask" methods must be the last call when using a MessageBox.
* This is the simplest "ask" method. It presents the provided
*
* @param message.
*/
public void ask(String message) {
if (frame == null) {
frame = new JFrame();
frameNotProvided = true;
} else {
frameNotProvided = false;
}
dialog = new JDialog(frame, true); // Modal
dialog.addWindowListener(this);
dialog.addKeyListener(this);
dialog.setTitle(title);
dialog.setLayout(new BorderLayout(5, 5)); JPanel messagePanel = createMultiLinePanel(message);
JPanel centerPanel = new JPanel();
centerPanel.add(messagePanel);
dialog.add("Center", centerPanel);
dialog.add("South", buttonPanel);
dialog.pack();
enforceMinimumSize(dialog, 200, 100);
centerWindow(dialog);
Toolkit.getDefaultToolkit().beep(); // Start a new thread to show the dialog
Thread thread = new Thread(this);
thread.start();
} /**
* Same as ask(String message) except adds an "Okay" button.
*/
public void askOkay(String message) {
addChoice("Okay");
ask(message);
} /**
* Same as ask(String message) except adds "Yes" and "No" buttons.
*/
public void askYesNo(String message) {
addChoice("Yes");
addChoice("No");
ask(message);
} // ---------- Private Methods -----------------------------
private JPanel createMultiLinePanel(String message) {
JPanel mainPanel = new JPanel();
GridBagLayout gbLayout = new GridBagLayout();
mainPanel.setLayout(gbLayout);
addMultilineString(message, mainPanel);
return mainPanel;
} // There are a variaty of ways to do this....
private void addMultilineString(String message, Container container) { GridBagConstraints constraints = getDefaultConstraints();
constraints.gridwidth = GridBagConstraints.REMAINDER;
// Insets() args are top, left, bottom, right
constraints.insets = new Insets(0, 0, 0, 0);
GridBagLayout gbLayout = (GridBagLayout) container.getLayout(); while (message.length() > 0) {
int newLineIndex = message.indexOf('\n');
String line;
if (newLineIndex >= 0) {
line = message.substring(0, newLineIndex);
message = message.substring(newLineIndex + 1);
} else {
line = message;
message = "";
}
JLabel label = new JLabel(line);
gbLayout.setConstraints(label, constraints);
container.add(label);
}
} private GridBagConstraints getDefaultConstraints() {
GridBagConstraints constraints = new GridBagConstraints();
constraints.weightx = 1.0;
constraints.weighty = 1.0;
constraints.gridheight = 1; // One row high
// Insets() args are top, left, bottom, right
constraints.insets = new Insets(4, 4, 4, 4);
// fill of NONE means do not change size
constraints.fill = GridBagConstraints.NONE;
// WEST means align left
constraints.anchor = GridBagConstraints.WEST; return constraints;
} private void centerWindow(JDialog win) {
Dimension screenDim = Toolkit.getDefaultToolkit().getScreenSize();
// If larger than screen, reduce window width or height
if (screenDim.width < win.getSize().width) {
win.setSize(screenDim.width, win.getSize().height);
}
if (screenDim.height < win.getSize().height) {
win.setSize(win.getSize().width, screenDim.height);
}
// Center Frame, Dialogue or Window on screen
int x = (screenDim.width - win.getSize().width) / 2;
int y = (screenDim.height - win.getSize().height) / 2;
win.setLocation(x, y);
} private void enforceMinimumSize(JDialog comp, int minWidth, int minHeight) {
if (comp.getSize().width < minWidth) {
comp.setSize(minWidth, comp.getSize().height);
}
if (comp.getSize().height < minHeight) {
comp.setSize(comp.getSize().width, minHeight);
}
}} // End class在调用它的WindowsMain类里添加一个Close按钮，点击Close按钮时调用MessageBox选择yes或no。 jCloseButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
//System.out.println("actionPerformed()"); // TODO Auto-generated Event stub actionPerformed()
MessageBox box = new MessageBox();
box.setTitle("Warning");
box.askYesNo("Do you really want to exit?"); //添加MessageBox的按钮事件Listener。
box.setActionListener(new java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent e){
JButton button=(JButton)e.getSource();
if(button.getText()=="Yes")
System.exit(0);
}
}
);
}
});
这个可以用div，也可以用js，这个很普通的，上网搜很多