import javax.swing.*;
import java.awt.event.*;
import java.sql.*;

编译是能通过的，但是按“确定”键没反应。好像没有能成功连接数据库，请大家帮忙看看，修改一下。
class LoginFrm extends JFrame implements ActionListener
{
   JLabel lbl1=new JLabel("用户名");
   JLabel lbl2=new JLabel("密码");
   JTextField txt=new JTextField(15);
   JPasswordField pf=new JPasswordField();
   JButton btn1=new JButton("确定");
   JButton btn2=new JButton("取消");

public LoginFrm()
{
   this.setTitle("登陆");
   JPanel jp=(JPanel)this.getContentPane();
   jp.setLayout(new GridLayout(3,2,10,10));
   jp.add(lbl1);
   jp.add(txt);
   jp.add(lbl2);
   jp.add(pf);
   jp.add(btn1);
   jp.add(btn2);
   btn1.addActionListener(this);
   btn2.addActionListener(this);
}

public void actionPerformed(ActionEvent ae)
{
  
   if(ae.getSource()==btn1)
    {
       try
      {
        new sun.jdbc.odbc.JdbcOdbcDriver();
        
        Connection con=DriverManager.getConnection("77AA95","sa","95");
        Statement cmd=con.createStatement();
        ResultSet rs=cmd.executeQuery("select id,password from web_user where id='"+txt.getText()+"' and password='"+pf.getText()+"'");
        if(rs.next())
        {
            JOptionPane.showMessageDialog(null,"登陆成功！");
        }
        
        else   JOptionPane.showMessageDialog(null,"用户名或密码错误！");
    } catch(Exception ex){}  
  }
   if(ae.getSource()==btn2)
   {
     txt.setText("");
     pf.setText("");
    }
 }

public static void main(String arg[])
{
JFrame.setDefaultLookAndFeelDecorated(true);
LoginFrm frm=new LoginFrm();
frm.setSize(750,200);
frm.setVisible(true);
}
}

我以前没有写过JDBC的程序，这是第一个。SQL sever2000，JDK1.6的，msbase.jar,mssqlsever.jar,msutil.jar三个.jar文件已经放到Java、JDK1.6的lib里面了。
应该就是驱动或数据库问题，但是我不知道该怎么解决