gui界面修改密码java

你可以使用Java Swing库来创建一个GUI界面，然后使用Java的JDBC API来连接数据库并更新密码。以下是一个简单的示例代码：

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

import javax.swing.*;

public class PasswordChangeGUI extends JFrame implements ActionListener {

    private JLabel lblUsername, lblOldPassword, lblNewPassword;
    private JTextField txtUsername;
    private JPasswordField txtOldPassword, txtNewPassword;
    private JButton btnUpdate;

    public PasswordChangeGUI() {
        setTitle("Password Change");
        setSize(350, 200);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel(new GridLayout(4, 2));

        lblUsername = new JLabel("Username:");
        txtUsername = new JTextField(20);
        panel.add(lblUsername);
        panel.add(txtUsername);

        lblOldPassword = new JLabel("Old Password:");
        txtOldPassword = new JPasswordField(20);
        panel.add(lblOldPassword);
        panel.add(txtOldPassword);

        lblNewPassword = new JLabel("New Password:");
        txtNewPassword = new JPasswordField(20);
        panel.add(lblNewPassword);
        panel.add(txtNewPassword);

        btnUpdate = new JButton("Update Password");
        btnUpdate.addActionListener(this);
        panel.add(btnUpdate);

        add(panel);
    }

    public void actionPerformed(ActionEvent e) {
        String username = txtUsername.getText();
        String oldPassword = new String(txtOldPassword.getPassword());
        String newPassword = new String(txtNewPassword.getPassword());

        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "root", "password");

            PreparedStatement ps = con.prepareStatement("SELECT * FROM users WHERE username=? AND password=?");
            ps.setString(1, username);
            ps.setString(2, oldPassword);

            ResultSet rs = ps.executeQuery();

            if (rs.next()) {
                ps = con.prepareStatement("UPDATE users SET password=? WHERE username=?");
                ps.setString(1, newPassword);
                ps.setString(2, username);

                int rowsUpdated = ps.executeUpdate();

                if (rowsUpdated > 0) {
                    JOptionPane.showMessageDialog(this, "Password updated successfully");
                } else {
                    JOptionPane.showMessageDialog(this, "Failed to update password");
                }
            } else {
                JOptionPane.showMessageDialog(this, "Invalid username or password");
            }

            con.close();
        } catch (Exception ex) {
            ex.printStackTrace();
            JOptionPane.showMessageDialog(this, "Error updating password: " + ex.getMessage());
        }
    }

    public static void main(String[] args) {
        PasswordChangeGUI gui = new PasswordChangeGUI();
        gui.setVisible(true);
    }
}

在这个例子中，我们使用了JDBC API来连接MySQL数据库。你需要将以下代码中的数据库连接信息替换成你自己的：

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "root", "password");

这里的mydatabase是数据库名称，root是用户名，password是密码。你需要根据你自己的设置来修改这些参数。