jsp验证mysql

<%@ page import="java.sql.*" %>
<%
    String username = request.getParameter("username");
    String password = request.getParameter("password");

    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;

    try {
        // 加载MySQL驱动
        Class.forName("com.mysql.jdbc.Driver");
        // 建立数据库连接
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "root", "password");
        // 准备SQL语句
        String sql = "SELECT * FROM users WHERE username = ? AND password = ?";
        pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, username);
        pstmt.setString(2, password);
        // 执行查询
        rs = pstmt.executeQuery();

        if (rs.next()) {
            out.println("登录成功！");
        } else {
            out.println("用户名或密码错误！");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        // 关闭资源
        try { if (rs != null) rs.close(); } catch (Exception e) {}
        try { if (pstmt != null) pstmt.close(); } catch (Exception e) {}
        try { if (conn != null) conn.close(); } catch (Exception e) {}
    }
%>