嘿伙计我是业余程序员（在Gr12中）并正在开发一个程序，通过自定义JDialog（使用eclipse WindowBuilder创建）向用户询问用户名和密码
我遇到的问题是从“弹出窗口”中检索数据，我编写了一个测试程序但是在我输入任何数据之前显示了这些值。
这是我的代码：
package winowbuilderstuff;
public class TestDialog {
/**
* @param args
*/
public static void main(String[] args) {
LoginDialog login = new LoginDialog ();
login.setVisible(true);
String username = login.getUser();
String password = login.getPass();
System.out.println("Username: " + username);
System.out.println("Password: " + password);
}
}
package winowbuilderstuff;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class LoginDialog extends JDialog {
private final JPanel contentPanel = new JPanel();
private JTextField txtfUsername;
private JPasswordField pswrdf;
/**
* Launch the application.
*/
public static void main(String[] args) {
try {
LoginDialog dialog = new LoginDialog();
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Create the dialog.
*/
public LoginDialog() {
setTitle("Login");
setBounds(100, 100, 478, 150);
getContentPane().setLayout(new BorderLayout());
contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
getContentPane().add(contentPanel, BorderLayout.CENTER);
contentPanel.setLayout(null);
{
JLabel lblUsername = new JLabel("Username");
lblUsername.setBounds(25, 13, 68, 14);
contentPanel.add(lblUsername);
}
{
txtfUsername = new JTextField();
txtfUsername.setToolTipText("Enter your username");
txtfUsername.setBounds(137, 13, 287, 17);
contentPanel.add(txtfUsername);
txtfUsername.setColumns(10);
}
JLabel lblPassword = new JLabel("Password");
lblPassword.setBounds(25, 52, 68, 14);
contentPanel.add(lblPassword);
pswrdf = new JPasswordField();
pswrdf.setToolTipText("Enter your password");
pswrdf.setBounds(137, 50, 287, 17);
contentPanel.add(pswrdf);
{
JPanel buttonPane = new JPanel();
buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
getContentPane().add(buttonPane, BorderLayout.SOUTH);
{
JButton btnLogin = new JButton("Login");
btnLogin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
getUser();
getPass();
dispose();
}
});
btnLogin.setActionCommand("OK");
buttonPane.add(btnLogin);
getRootPane().setDefaultButton(btnLogin);
}
{
JButton btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
dispose();
}
});
btnCancel.setActionCommand("Cancel");
buttonPane.add(btnCancel);
}
}
}
public String getUser(){
return txtfUsername.getText();
}
public String getPass(){
return pswrdf.getText();
}
}
答案 0 :(得分：3)
super(...)构造函数调用或简单的方法调用来完成。setVisible(true)的站点上的调用代码，然后在对话框不再可见时返回到同一点的调用代码。setVisible(true)之后立即通过调用您的getUser()和getPass()方法查询对话框对象的用户名和密码。getText()，因为这不是安全的代码。而是通过char[]从getPassword()获取setBounds(...)，并使用此项，因为 更安全。 public LoginDialog() {
super(null, ModalityType.APPLICATION_MODAL); // add this line
进行组件放置，因为这会使GUI非常不灵活，虽然它们在一个平台上看起来很好但在大多数其他平台或屏幕分辨率上看起来很糟糕难以更新和维护。import java.awt.Dialog.ModalityType;
import java.awt.event.ActionEvent;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Window;
import javax.swing.*;
public class TestDialog2 {
private static void createAndShowGui() {
int result = MyLoginPanel.showDialog();
if (result == JOptionPane.OK_OPTION) {
String userName = MyLoginPanel.getUserName();
char[] password = MyLoginPanel.getPassword();
System.out.println("User Name: " + userName);
System.out.println("Password: " + new String(password));
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
@SuppressWarnings("serial")
class MyLoginPanel extends JPanel {
private static MyLoginPanel myLoginPanel = new MyLoginPanel();
private static JDialog myDialog;
public static final String RETURN_STATE = "return state";
private static final int COLUMNS = 20;
private JTextField userNameField = new JTextField(COLUMNS);
private JPasswordField passField = new JPasswordField(COLUMNS);
private int returnState = Integer.MIN_VALUE;
private MyLoginPanel() {
setLayout(new GridBagLayout());
add(new JLabel("User Name:"), createGbc(0, 0, 1));
add(userNameField, createGbc(1, 0, 2));
add(new JLabel("Password:"), createGbc(0, 1, 1));
add(passField, createGbc(1, 1, 2));
add(new JLabel(""), createGbc(0, 2, 1));
JPanel buttonPanel = new JPanel(new GridLayout(1, 0, 5, 0));
buttonPanel.add(new JButton(new LoginAction("Login")));
buttonPanel.add(new JButton(new CancelAction("Cancel")));
add(buttonPanel, createGbc(1, 2, 2));
}
private GridBagConstraints createGbc(int x, int y, int width) {
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = width;
gbc.gridheight = 1;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.fill = GridBagConstraints.HORIZONTAL;
int right = x == 0 ? 15 : 5;
gbc.insets = new Insets(5, 5, 5, right);
gbc.anchor = x == 0 ? GridBagConstraints.LINE_START : GridBagConstraints.LINE_END;
return gbc;
}
public void setReturnState(int returnState) {
this.returnState = returnState;
firePropertyChange(RETURN_STATE, Integer.MIN_VALUE, returnState);
}
public int getReturnState() {
return returnState;
}
private class LoginAction extends AbstractAction {
public LoginAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
returnState = JOptionPane.OK_OPTION;
Window win = SwingUtilities.getWindowAncestor(MyLoginPanel.this);
win.dispose();
}
}
private String _getUserName() {
return userNameField.getText();
}
private char[] _getPassword() {
return passField.getPassword();
}
public static String getUserName() {
return myLoginPanel._getUserName();
}
public static char[] getPassword() {
return myLoginPanel._getPassword();
}
private class CancelAction extends AbstractAction {
public CancelAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
returnState = JOptionPane.CANCEL_OPTION;
Window win = SwingUtilities.getWindowAncestor(MyLoginPanel.this);
win.dispose();
}
}
public static int showDialog() {
if (myDialog == null) {
myDialog = new JDialog(null, "Test", ModalityType.APPLICATION_MODAL);
myDialog.add(myLoginPanel);
myDialog.pack();
}
myDialog.setVisible(true);
return myLoginPanel.getReturnState();
}
}
例如：
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class TestDialog3 {
private static void createAndShowGui() {
MyLoginPanel3 myLoginPanel3 = new MyLoginPanel3();
int result = JOptionPane.showConfirmDialog(null, myLoginPanel3, "Log On", JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
if (result == JOptionPane.OK_OPTION) {
String userName = myLoginPanel3.getUserName();
char[] password = myLoginPanel3.getPassword();
System.out.println("User Name: " + userName);
System.out.println("Password: " + new String(password));
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
@SuppressWarnings("serial")
class MyLoginPanel3 extends JPanel {
private static final int COLUMNS = 20;
private JTextField userNameField = new JTextField(COLUMNS);
private JPasswordField passField = new JPasswordField(COLUMNS);
public MyLoginPanel3() {
setLayout(new GridBagLayout());
add(new JLabel("User Name:"), createGbc(0, 0, 1));
add(userNameField, createGbc(1, 0, 2));
add(new JLabel("Password:"), createGbc(0, 1, 1));
add(passField, createGbc(1, 1, 2));
add(new JLabel(""), createGbc(0, 2, 1));
}
private GridBagConstraints createGbc(int x, int y, int width) {
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = width;
gbc.gridheight = 1;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.fill = GridBagConstraints.HORIZONTAL;
int right = x == 0 ? 15 : 5;
gbc.insets = new Insets(5, 5, 5, right);
gbc.anchor = x == 0 ? GridBagConstraints.LINE_START : GridBagConstraints.LINE_END;
return gbc;
}
public String getUserName() {
return userNameField.getText();
}
public char[] getPassword() {
return passField.getPassword();
}
}
或者更简单，只需使用JOptionPane作为模态对话框。您可以轻松地将JPanel传递给它。
例如：
Option Explicit
Dim xlApp, xlBook
set xlApp = CreateObject("Excel.Application")
xlApp.DisplayAlerts = False
'set xlBook = xlApp.Workbooks.Open("C:\Users\HGAGNE\Desktop\Master.xlsm", UpdateLinks:=2, ReadOnly:=False)'in VBA as this for explanation
set xlBook = xlApp.Workbooks.Open("C:\Users\HGAGNE\Desktop\Master.xlsm", 2, False) 'in VBS
xlApp.Run "BatchProcessing"
'xlBook.Close SaveChanges:=True 'in VBA as this for explanation
xlBook.Close True 'in VBS
xlApp.Quit
'xlApp.DisplayAlerts = True 'not really a need for this
Set xlBook = Nothing
Set xlApp = Nothing