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/
UpdateMima.java

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

class UpdateMima extends JFrame implements ActionListener {

    JFrame f;
    Container cp;
    JPanel jp1, jp2, jp3, jp4, jp, jpanelWest;
    JButton jbt1, jbt2;//按钮，确定、取消
    JLabel label;                //标签：修改密码
    JTextField name;
    JPasswordField tf1, tf2, tf3;    //定义文本框
    JLabel label1, label2, label3, label4;
    String sno;

    UpdateMima() {
    }

    UpdateMima(String username) {
        sno = username;
        f = new JFrame();
        cp = f.getContentPane(); // 初始化
        jp1 = new JPanel();
        jp2 = new JPanel();
        jp3 = new JPanel();
        jp4 = new JPanel();
        jpanelWest = new JPanel();
        jp = new JPanel();
        //------------------------------------------------
        jbt1 = new JButton("确定");
        jbt2 = new JButton("取消");


        //------------------------------------------------
        label = new JLabel("<html><font color=#CC00FF size='4'>修改密码</font>", SwingConstants.CENTER);
        label.setForeground(Color.blue);
        label.setFont(new Font("BOLD", Font.BOLD, 15));
        name = new JTextField(20);
        //name.setEditable(false);


        //------------------------------------------------
        tf1 = new JPasswordField(20);//密码框
        tf2 = new JPasswordField(20);
        tf3 = new JPasswordField(20);

        //------------------------------------------------
        //布局,添加控件

        jp1.add(jbt1);
        jp1.add(jbt2);

        jp1.add(new JLabel("您好" + "xx" + "欢迎登陆学生信息系统"));

        JPanel jpanel = new JPanel();
        jpanel.add(label);

        JPanel pp4 = new JPanel();
        JPanel jpane4 = new JPanel();

        cp.add(jpanel, "North");
        JPanel pp2 = new JPanel(new GridLayout(6, 1));
        JPanel pp3 = new JPanel();
        pp4.setLayout(new GridLayout(6, 1));
        pp4.add(new JLabel("用户名: ", SwingConstants.RIGHT));
        pp2.add(name);
        pp4.add(new JLabel("原密码: ", SwingConstants.RIGHT));

        pp2.add(tf1);
        pp4.add(new JLabel(" 新密码: ", SwingConstants.RIGHT));
        pp2.add(tf2);
        pp4.add(new JLabel("确认密码: ", SwingConstants.RIGHT));
        pp2.add(tf3);
        pp2.add(new JLabel());
        JPanel jpbutton = new JPanel();
        jpbutton.add(jbt1);
        jpbutton.add(jbt2);
        pp2.add(jpbutton);


        //pp3.add(jbt1);

        //pp3.add(jbt2);

        cp.add(pp4, "West");
        cp.add(pp2, "Center");
        //cp.add(pp3,"South");

        cp.add(jpane4, "East");

        //------------------------------------------------
        Toolkit kit = Toolkit.getDefaultToolkit();
        Dimension screen = kit.getScreenSize();
        int x = screen.width;                    /*取得显示器窗口的宽度*/
        int y = screen.height;
        f.setSize(350, 330);                    /*取得显示器窗口的高度*/
        int xcenter = (x - 350) / 2;
        int ycenter = (y - 330) / 2;
        f.setLocation(xcenter, ycenter);/*显示在窗口中央*/
        //f.setTitle("修改密码");
        f.setVisible(true);

        //-------------------------------------------------
        jbt1.addActionListener(this);//注册监听器
        jbt2.addActionListener(this);

    /*f.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);
			}
		}
		);*/
    }

    public void updateM() {

        try {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        } catch (ClassNotFoundException e) {
            System.out.println("加载驱动程序失败!");
        }
        try {
            Connection con = DriverManager.getConnection("jdbc:odbc:Book", "", "");
            Statement sql = con.createStatement();
            String uname = name.getText().trim();
            String queryMima = "select * from user where 用户名='" + uname + "'";
            ResultSet rs = sql.executeQuery(queryMima);
            if (rs.next()) {

                String newMima = tf2.getText().trim();
                String s = "update user set 密码='" + newMima + "' where 用户名 ='" + uname + "'";
                sql = con.createStatement();
                int updateMima = sql.executeUpdate(s);
                if (updateMima == 1) {
                    JOptionPane.showMessageDialog(f, "密码修改成功！");

                }
                con.close();
                f.repaint();
            } else {
                JOptionPane.showMessageDialog(null, "该用户不存在", "警告！",
                        JOptionPane.YES_NO_OPTION);

            }
            name.setText("");
            tf1.setText("");
            tf2.setText("");
            tf3.setText("");
        } catch (SQLException g) {
            System.out.println("E Code" + g.getErrorCode());
            System.out.println("E M" + g.getMessage());
        }

    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String cmd = e.getActionCommand();
        if (cmd.equals("确定")) {
            if (name.getText().equals("") || tf1.getText().equals("") || tf2.getText().equals("") || tf3.getText().equals("")) {
                JOptionPane.showMessageDialog(null, "请填写用户的所有信息", "提示",
                        JOptionPane.YES_NO_OPTION);
                return;
            }

            if (tf2.getText().trim().equals(tf3.getText().trim()))
                updateM();

        } else if (cmd.equals("取消"))
            f.hide();
    }

    public static void main(String[] args) {
        new UpdateMima("");
    }
}