请给出以上内容的详细代码

由于您提供的信息比较概括，我会简要地给出一些关键部分的代码示例。实际项目会比这更复杂，涉及文件结构、完整的异常处理和配置等。这里我们以Java Servlet为例，假设使用JDBC连接MySQL。

1. **数据库连接池（Spring Boot示例）**:

@Configuration
public class DataSourceConfig {
    @Value("${spring.datasource.url}")
    private String url;
    
    @Value("${spring.datasource.username}")
    private String username;

    @Value("${spring.datasource.password}")
    private String password;

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        return dataSource;
    }
}

2. **登录注册业务处理（Servlet）**:

@WebServlet("/login")
public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        try (Connection conn = dataSource.getConnection();
             PreparedStatement pstmt = conn.prepareStatement("SELECT * FROM users WHERE username = ?")) {
            pstmt.setString(1, username);
            ResultSet rs = pstmt.executeQuery();
            // 检查是否存在匹配的用户...
        } catch (SQLException e) {
            // 处理异常
        }
        // 更多登录逻辑...
    }

    // 注册逻辑类似，只是增加INSERT语句
}

3. **显示用户列表**:

@WebServlet("/users")
public class UsersServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try (Connection conn = dataSource.getConnection();
             Statement stmt = conn.createStatement()) {
            ResultSet rs = stmt.executeQuery("SELECT * FROM users");
            while (rs.next()) {
                // 读取用户信息，填充JSP页面
            }
        } catch (SQLException e) {
            // 处理异常
        }
    }
}

请注意，这只是一个基础的框架，实际应用中还需要考虑分页、安全性和错误处理等方面。每个功能的具体实现会更细致且涉及更多代码。