如何用JAVA 写登陆功能！

以下写的登陆功能有点问题，能帮我改改吗？？package s1.pro.ch1;import java.awt.*;
import javax.swing.*;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Connection;
import s1.pro.DAO.DBManager;
import java.sql.*;public class LoginFrame extends JFrame {
    public LoginFrame() {
        try {
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
    private void jbInit() throws Exception {
        getContentPane().setLayout(null);
        this.setTitle("登陆");
        lblName.setText("用户名：");
        lblName.setBounds(new Rectangle(80, 80, 50, 25));
        lblPassword.setText("密  码：");
        lblPassword.setBounds(new Rectangle(80, 140, 50, 25));
        txtName.setBounds(new Rectangle(200, 80, 90, 25));
        Password.setBounds(new Rectangle(200, 140, 90, 25));
        btnReset.setBounds(new Rectangle(235, 200, 80, 25));
        btnReset.setText("重置");
        btnReset.addActionListener(new LoginFrame_btnReset_actionAdapter(this));
        btnSubmit.setBounds(new Rectangle(95, 200, 80, 25));
        btnSubmit.setText("登陆");
        btnSubmit.addActionListener(new LoginFrame_btnSubmit_actionAdapter(this));
        dlgMessage.setBounds(new Rectangle(46, 248, 262, 90));        this.getContentPane().add(lblName);
        this.getContentPane().add(btnReset);
        this.getContentPane().add(btnSubmit);
        this.getContentPane().add(txtName);
        this.getContentPane().add(lblPassword);
        this.getContentPane().add(Password);
        this.getContentPane().add(Password);
    }
    JTextField txtName = new JTextField();
    JPasswordField Password = new JPasswordField();
    JLabel lblName = new JLabel();
    JLabel lblPassword = new JLabel();
    JButton btnSubmit = new JButton();
    JButton btnReset = new JButton();
    JOptionPane dlgMessage = new JOptionPane();    public void btnSubmit_actionPerformed(ActionEvent e) {        String inputName = new String(txtName.getText());
        String inputPassword = new String(Password.getPassword());        if (inputName.length() == 0 || inputPassword.length() == 0) {
            JOptionPane.showMessageDialog(this, "用户名或密码不能为空！");
        }        try {
            Connection con = new DBManager().getConnection();
            PreparedStatement pstmt = con.prepareStatement(
                    "select * from OPERATOR");
            ResultSet rs = pstmt.executeQuery();
//System.out.println(rs.next());            while (rs.next()) {
                String name = rs.getString(1).trim();
                String pass = rs.getString(2).trim();
//System.out.println("程序运行到1");
//System.out.println(name);
//System.out.println(pass);                if (inputName.equals(name) && inputPassword.equals(pass)) {
//System.out.println("程序运行到2");
                    MM frame = new MM();
                    Dimension screenSize = Toolkit.getDefaultToolkit().
                                           getScreenSize();
                    Dimension frameSize = frame.getSize();
                    if (frameSize.height > screenSize.height) {
                        frameSize.height = screenSize.height;
                    }
                    if (frameSize.width > screenSize.width) {
                        frameSize.width = screenSize.width;
                    }
                    frame.setLocation((screenSize.width - frameSize.width) / 2,
                                      (screenSize.height - frameSize.height) / 2);                    frame.setVisible(true);
                    dispose();
                } else {
                    continue;
                }
            }
            JOptionPane.showMessageDialog(this, "用户名或密码错误！");
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }    public void btnReset_actionPerformed(ActionEvent e) {
        txtName.setText("");
        Password.setText("");
    }
}
class LoginFrame_btnReset_actionAdapter implements ActionListener {
    private LoginFrame adaptee;
    LoginFrame_btnReset_actionAdapter(LoginFrame adaptee) {
        this.adaptee = adaptee;
    }    public void actionPerformed(ActionEvent e) {
        adaptee.btnReset_actionPerformed(e);
    }
}
class LoginFrame_btnSubmit_actionAdapter implements ActionListener {
    private LoginFrame adaptee;
    LoginFrame_btnSubmit_actionAdapter(LoginFrame adaptee) {
        this.adaptee = adaptee;
    }    public void actionPerformed(ActionEvent e) {
        adaptee.btnSubmit_actionPerformed(e);
    }
}