求纯java代码联接sql server2000的用户登陆界面

import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;import javax.swing.JOptionPane;public class AFrame extends javax.swing.JFrame {    private String driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";    private Connection con; // 数据库连接    public AFrame() {    initComponents();    this.setTitle("连接数据库");    }    // <editor-fold defaultstate="collapsed" desc=" 生成的代码 ">    private void initComponents() {        jTextField1 = new javax.swing.JTextField();        jLabel1 = new javax.swing.JLabel();        jLabel2 = new javax.swing.JLabel();        jTextField2 = new javax.swing.JTextField();        jLabel3 = new javax.swing.JLabel();        jTextField3 = new javax.swing.JTextField();        jButton1 = new javax.swing.JButton();        getContentPane().setLayout(null);        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);        getContentPane().add(jTextField1);        jTextField1.setBounds(60, 10, 80, 19);        jLabel1.setText("IP");        getContentPane().add(jLabel1);        jLabel1.setBounds(40, 10, 10, 14);        jLabel2.setText("name");        getContentPane().add(jLabel2);        jLabel2.setBounds(30, 30, 26, 14);        getContentPane().add(jTextField2);        jTextField2.setBounds(60, 30, 80, 19);        jLabel3.setText("password");        getContentPane().add(jLabel3);        jLabel3.setBounds(10, 50, 46, 14);        getContentPane().add(jTextField3);        jTextField3.setBounds(60, 50, 80, 19);        jButton1.setText("\u8fde\u63a5");        jButton1.addActionListener(new java.awt.event.ActionListener() {            public void actionPerformed(java.awt.event.ActionEvent evt) {                jButton1ActionPerformed(evt);            }        });        getContentPane().add(jButton1);        jButton1.setBounds(70, 80, 55, 23);        pack();    }// </editor-fold>    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {// TODO 将在此处添加您的处理代码：    String server = this.jTextField1.getText();    String userName = this.jTextField2.getText();    String password = this.jTextField3.getText();        String url = "jdbc:jdbc:sqlserver://"+server+";DatabaseName=master";    try {        Class.forName(driver);        con = DriverManager.getConnection(url,userName,password);        JOptionPane.showMessageDialog(this,"成功");    }catch(ClassNotFoundException e) {        e.printStackTrace();        JOptionPane.showMessageDialog(this,"失败");    } catch(SQLException e) {        e.printStackTrace();System.out.println(e.getMessage());        JOptionPane.showMessageDialog(this,"失败");    }    }        public static void main(String args[]) {    java.awt.EventQueue.invokeLater(new Runnable() {        public void run() {        new AFrame().setVisible(true);        }    });    }        // 变量声明 - 不进行修改    private javax.swing.JButton jButton1;    private javax.swing.JLabel jLabel1;    private javax.swing.JLabel jLabel2;    private javax.swing.JLabel jLabel3;    private javax.swing.JTextField jTextField1;    private javax.swing.JTextField jTextField2;    private javax.swing.JTextField jTextField3;    // 变量声明结束    }