分用户登录
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199
src/main/java/com/example/UserManagement.java
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199
src/main/java/com/example/UserManagement.java
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package com.example;
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import javax.swing.*;
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import javax.swing.table.DefaultTableModel;
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import java.awt.*;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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public class UserManagement extends JFrame implements ActionListener {
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JMenuBar menuBar;
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JMenuItem addItem, deleteItem, updateItem, refreshItem;
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private JTable table;
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private DefaultTableModel tableModel;
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public UserManagement() {
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super("用户信息管理");
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// 菜单栏
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menuBar = new JMenuBar();
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setJMenuBar(menuBar);
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addItem = new JMenuItem("添加用户");
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deleteItem = new JMenuItem("删除用户");
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updateItem = new JMenuItem("修改用户");
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refreshItem = new JMenuItem("刷新数据");
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menuBar.add(addItem);
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menuBar.add(deleteItem);
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menuBar.add(updateItem);
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menuBar.add(refreshItem);
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addItem.addActionListener(this);
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deleteItem.addActionListener(this);
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updateItem.addActionListener(this);
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refreshItem.addActionListener(this);
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// 表格模型
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String[] columnNames = {"用户名", "密码", "身份"};
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tableModel = new DefaultTableModel(columnNames, 0) {
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@Override
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public boolean isCellEditable(int row, int column) {
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return false; // 不直接在表格里改
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}
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};
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table = new JTable(tableModel);
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JScrollPane scrollPane = new JScrollPane(table);
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add(scrollPane, BorderLayout.CENTER);
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setSize(600, 400);
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setLocationRelativeTo(null);
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// 初始加载
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loadData();
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setVisible(true);
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}
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// 加载 identity=user 的数据
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private void loadData() {
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Jdbc jdbc = new Jdbc();
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try {
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ResultSet rs = jdbc.query("SELECT username,password,identity FROM user WHERE identity='user'");
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tableModel.setRowCount(0);
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while (rs.next()) {
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Object[] row = {
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rs.getString("username"),
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rs.getString("password"),
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rs.getString("identity")
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};
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tableModel.addRow(row);
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}
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rs.close();
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jdbc.close();
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} catch (SQLException e) {
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e.printStackTrace();
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JOptionPane.showMessageDialog(this, "加载数据失败: " + e.getMessage());
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}
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}
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@Override
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public void actionPerformed(ActionEvent e) {
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// 添加用户
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if (e.getSource() == addItem) {
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JFrame frame = new JFrame("添加用户");
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frame.setLayout(new GridLayout(5, 2));
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JLabel nameLabel = new JLabel("用户名:");
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JTextField nameField = new JTextField();
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JLabel passLabel = new JLabel("密码:");
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JPasswordField passField = new JPasswordField();
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JButton addButton = new JButton("添加");
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JButton cancelButton = new JButton("取消");
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frame.add(nameLabel); frame.add(nameField);
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frame.add(passLabel); frame.add(passField);
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frame.add(addButton); frame.add(cancelButton);
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addButton.addActionListener(ev -> {
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String username = nameField.getText();
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String password = passField.getText();
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Jdbc jdbc = new Jdbc();
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try {
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jdbc.update("INSERT INTO user (username,password,email,phone,identity) VALUES ('"
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+ username + "','" + password + "','user')");
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jdbc.close();
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loadData();
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frame.dispose();
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} catch (SQLException ex) {
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JOptionPane.showMessageDialog(frame, "添加失败: " + ex.getMessage());
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}
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});
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cancelButton.addActionListener(ev -> frame.dispose());
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frame.setSize(400, 250);
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frame.setLocationRelativeTo(null);
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frame.setVisible(true);
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}
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// 删除用户
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else if (e.getSource() == deleteItem) {
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int row = table.getSelectedRow();
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if (row == -1) {
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JOptionPane.showMessageDialog(this, "请先选择要删除的用户！");
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return;
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}
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String username = (String) tableModel.getValueAt(row, 0);
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int confirm = JOptionPane.showConfirmDialog(this, "确定删除用户: " + username + " ?", "确认", JOptionPane.YES_NO_OPTION);
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if (confirm == JOptionPane.YES_OPTION) {
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Jdbc jdbc = new Jdbc();
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try {
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jdbc.update("DELETE FROM user WHERE username='" + username + "'");
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jdbc.close();
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loadData();
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} catch (SQLException ex) {
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JOptionPane.showMessageDialog(this, "删除失败: " + ex.getMessage());
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}
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}
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}
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// 修改用户（选中一行后弹窗修改）
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else if (e.getSource() == updateItem) {
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int row = table.getSelectedRow();
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if (row == -1) {
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JOptionPane.showMessageDialog(this, "请先选择要修改的用户！");
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return;
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}
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String oldUsername = (String) tableModel.getValueAt(row, 0);
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JFrame frame = new JFrame("修改用户");
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frame.setLayout(new GridLayout(5, 2));
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JTextField nameField = new JTextField((String) tableModel.getValueAt(row, 0));
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JTextField passField = new JTextField((String) tableModel.getValueAt(row, 1));
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JTextField emailField = new JTextField((String) tableModel.getValueAt(row, 2));
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JTextField phoneField = new JTextField((String) tableModel.getValueAt(row, 3));
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JButton saveButton = new JButton("保存");
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JButton cancelButton = new JButton("取消");
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frame.add(new JLabel("用户名:")); frame.add(nameField);
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frame.add(new JLabel("密码:")); frame.add(passField);
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frame.add(new JLabel("邮箱:")); frame.add(emailField);
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frame.add(new JLabel("电话:")); frame.add(phoneField);
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frame.add(saveButton); frame.add(cancelButton);
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saveButton.addActionListener(ev -> {
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String username = nameField.getText();
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String password = passField.getText();
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String email = emailField.getText();
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String phone = phoneField.getText();
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Jdbc jdbc = new Jdbc();
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try {
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jdbc.update("UPDATE user SET username='" + username + "', password='" + password + "', email='" + email + "', phone='" + phone + "' WHERE username='" + oldUsername + "'");
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jdbc.close();
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loadData();
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frame.dispose();
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} catch (SQLException ex) {
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JOptionPane.showMessageDialog(frame, "修改失败: " + ex.getMessage());
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}
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});
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cancelButton.addActionListener(ev -> frame.dispose());
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frame.setSize(400, 250);
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frame.setLocationRelativeTo(null);
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frame.setVisible(true);
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}
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// 刷新数据
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else if (e.getSource() == refreshItem) {
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loadData();
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}
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}
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public static void main(String[] args) {
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new UserManagement();
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}
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}
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