gui 登陆界面

网上找的~~~自己还没看

public class login extends JFrame

{

private JComboBox nameJComboBox;

private JPanel userJPanel;

private JLabel pictureJLabel;

private JButton okJButton, cancelJButton;

private JLabel nameJLabel, passwordJLabel, note;

private JPasswordField passwordJPasswordField;

private String name1;

private String password1;

private String user;

private ImageIcon myImageIcon;

public login(){
createUserInterface(); // 调用创建用户界面方法
}

private void createUserInterface(){
Container contentPane = getContentPane();
contentPane.setLayout(null);
userJPanel = new JPanel();
userJPanel.setBounds(35, 120, 300, 96);
userJPanel.setBorder(BorderFactory.createEtchedBorder()); // 显示一圈边儿
userJPanel.setLayout(null);
contentPane.add(userJPanel);
nameJComboBox = new JComboBox();
nameJComboBox.setBounds(100, 12, 170, 25);
nameJComboBox.addItem("admin");
nameJComboBox.addItem("aloie");
nameJComboBox.setSelectedIndex(0);
nameJComboBox.setEditable(true);
userJPanel.add(nameJComboBox);
pictureJLabel = new JLabel();
pictureJLabel.setBounds(45, 0, 380, 118);
pictureJLabel.setIcon(new ImageIcon("pic.gif"));
contentPane.add(pictureJLabel);
nameJLabel = new JLabel("姓  名：");
nameJLabel.setBounds(20, 12, 80, 25);
userJPanel.add(nameJLabel);
passwordJPasswordField = new JPasswordField();
passwordJPasswordField.setBounds(100, 60, 170, 25);
userJPanel.add(passwordJPasswordField);
passwordJLabel = new JLabel("密  码：");
passwordJLabel.setBounds(20, 60, 80, 25);
userJPanel.add(passwordJLabel);
note = new JLabel("密码与用户名相同");
note.setBounds(0, 295, 180, 25);
add(note);
okJButton = new JButton("登  陆");
okJButton.setBounds(60, 250, 80, 25);
contentPane.add(okJButton);
okJButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent event){
okJButtonActionPerformed(event);
}
}
);
cancelJButton = new JButton("取  消");
cancelJButton.setBounds(210, 250, 80, 25);
contentPane.add(cancelJButton);
cancelJButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent event){
System.exit(0); // 退出登陆
}
}
);
setTitle("登陆窗口");
setSize(380, 350);
setResizable(false); // 将最大化按钮设置为不可用
}
private void okJButtonActionPerformed(ActionEvent event)
{
// okJButton响应事件,检查用户名和密码的匹配
name1 = nameJComboBox.getSelectedItem().toString();
if (name1.equals("admin"))
{
if (passwordJPasswordField.getText().equals("admin"))
{
showNewWindow();
setVisible(false);
} else
{
JOptionPane.showMessageDialog(this, "密码错误，拒绝登陆",
"密码错误 ！", JOptionPane.ERROR_MESSAGE);
}
}
else if (name1.equals("aloie"))
{
if (passwordJPasswordField.getText().equals("aloie"))
{
showNewWindow();
setVisible(false);
}
else
{
JOptionPane.showMessageDialog(this, "密码错误，拒绝登陆",
"密码错误 ！", JOptionPane.ERROR_MESSAGE);
}
}
}
public void showNewWindow()
{
JFrame jf = new JFrame("main Frame");
jf.setSize(500, 400);
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public static void main(String[] args)
{
JFrame.setDefaultLookAndFeelDecorated(true);
login mylogin = new login();
mylogin.setVisible(true);
mylogin.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}