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我想爲我的應用程序創建一個登錄表單，可以爲sqlite數據庫添加或刪除用戶，我創建了表用戶（nam，pass），但是我不能unclud它在我的登錄表單，它有人可以幫助我用java/sqlite登錄表格
這是我的登錄代碼：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class login extends JFrame{
// Variables declaration
private JLabel jLabel1;
private JLabel jLabel2;
private JTextField jTextField1;
private JPasswordField jPasswordField1;
private JButton jButton1;
private JPanel contentPane;
// End of variables declaration
public login(){
super();
create();
this.setVisible(true);
}
private void create(){
jLabel1 = new JLabel();
jLabel2 = new JLabel();
jTextField1 = new JTextField();
jPasswordField1 = new JPasswordField();
jButton1 = new JButton();
contentPane = (JPanel)this.getContentPane();
//
// jLabel1
//
jLabel1.setHorizontalAlignment(SwingConstants.LEFT);
jLabel1.setForeground(new Color(0, 0, 255));
jLabel1.setText("username:");
//
// jLabel2
//
jLabel2.setHorizontalAlignment(SwingConstants.LEFT);
jLabel2.setForeground(new Color(0, 0, 255));
jLabel2.setText("password:");
//
// jTextField1
//
jTextField1.setForeground(new Color(0, 0, 255));
jTextField1.setSelectedTextColor(new Color(0, 0, 255));
jTextField1.setToolTipText("Enter your username");
jTextField1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
jTextField1_actionPerformed(e);
}
});
//
// jPasswordField1
//
jPasswordField1.setForeground(new Color(0, 0, 255));
jPasswordField1.setToolTipText("Enter your password");
jPasswordField1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
jPasswordField1_actionPerformed(e);
}
});
//
// jButton1
//
jButton1.setBackground(new Color(204, 204, 204));
jButton1.setForeground(new Color(0, 0, 255));
jButton1.setText("Login");
jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
jButton1_actionPerformed(e);
}
});
//
// contentPane
//
contentPane.setLayout(null);
contentPane.setBorder(BorderFactory.createEtchedBorder());
contentPane.setBackground(new Color(204, 204, 204));
addComponent(contentPane, jLabel1, 5,10,106,18);
addComponent(contentPane, jLabel2, 5,47,97,18);
addComponent(contentPane, jTextField1, 110,10,183,22);
addComponent(contentPane, jPasswordField1, 110,45,183,22);
addComponent(contentPane, jButton1, 150,75,83,28);
//
// login
//
this.setTitle("Login To Members Area");
this.setLocation(new Point(76, 182));
this.setSize(new Dimension(335, 141));
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setResizable(false);
}
/** Add Component Without a Layout Manager (Absolute Positioning) */
private void addComponent(Container container,Component c,int x,int y,int width,int height){
c.setBounds(x,y,width,height);
container.add(c);
}
private void jTextField1_actionPerformed(ActionEvent e){
}
private void jPasswordField1_actionPerformed(ActionEvent e){
}
private void jButton1_actionPerformed(ActionEvent e){
System.out.println("\njButton1_actionPerformed(ActionEvent e) called.");
String username = new String(jTextField1.getText());
String password = new String(jPasswordField1.getText());
if(username.equals("") || password.equals("")){// If password and username is empty > Do this >>>
jButton1.setEnabled(false);
JLabel errorFields = new JLabel("<HTML><FONT COLOR = Blue>You must enter a username and password to login.</FONT></HTML>");
JOptionPane.showMessageDialog(null,errorFields);
jTextField1.setText("");
jPasswordField1.setText("");
jButton1.setEnabled(true);
this.setVisible(true);
} else{
JLabel optionLabel = new JLabel("<HTML><FONT COLOR = Blue>You entered</FONT><FONT COLOR = RED> <B>"+username+"</B></FONT> <FONT COLOR = Blue>as your username.<BR> Is this correct?</FONT></HTML>");
int confirm =JOptionPane.showConfirmDialog(null,optionLabel);
switch(confirm){ // Switch > Case
case JOptionPane.YES_OPTION: // Attempt to Login user
jButton1.setEnabled(false); // Set button enable to false to prevent 2 login attempts
break;
case JOptionPane.NO_OPTION: // No Case.(Go back. Set text to 0)
jButton1.setEnabled(false);
jTextField1.setText("");
jPasswordField1.setText("");
jButton1.setEnabled(true);
break;
case JOptionPane.CANCEL_OPTION: // Cancel Case.(Go back. Set text to 0)
jButton1.setEnabled(false);
jTextField1.setText("");
jPasswordField1.setText("");
jButton1.setEnabled(true);
break;
} // End Switch > Case
}
}
public static void main(String[] args){
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
try{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}catch (Exception ex){
System.out.println("Failed loading L&F: ");
System.out.println(ex);
}
new login();
};
}
我connectDb類：
public class Connectdb {
private static Connection connect;
private static String url ="jdbc:sqlite:data.db";
private static Statement st;
private static ResultSet rs;
/**
* Constructeur privé d'une connection à la bd unique
*/
private ConnectionBd(){
try {
Class.forName("org.sqlite.JDBC");
connect = DriverManager.getConnection(url);
} catch (ClassNotFoundException ex) {
Logger.getLogger(ex.getName()).log(Level.SEVERE, null, ex);
} catch (SQLException e) {
System.exit(e.getErrorCode());
}
}
public static Connection getInstance(){
if(connect == null){
new Connectdb();
}else{
}
return connect;
}
/**
* @return
*/
public static void initTable(String query){
try {
Statement state = getInstance().createStatement(ResultSet.TYPE_FORWARD_ONLY,
ResultSet.CONCUR_READ_ONLY);
ResultSet res = state.executeQuery(query);
res.close();
state.close();
} catch (SQLException e) {
JOptionPane.showMessageDialog(null, e.getMessage(), "ERROR ! ", JOptionPane.ERROR_MESSAGE);
}
}
請正確縮進您的代碼（至少四個空格，以便格式化程序將其識別爲代碼）。這實際上是不可讀的。 – 2010-05-16 11:16:14
...並請儘量縮短您的代碼，以便它只顯示您希望我們解決的問題。 – tangens 2010-05-16 11:17:41
將您的代碼添加到CODE標籤 – Xorty 2010-05-16 11:17:50