jsp mysql登录

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL,
    password VARCHAR(255) NOT NULL
);

<form action="loginProcess.jsp" method="post">
    Username: <input type="text" name="username"><br>
    Password: <input type="password" name="password"><br>
    <input type="submit" value="Login">
</form>

<%@ page import="java.sql.*" %>
<%
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    
    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;
    
    try {
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/your_database", "root", "your_password");
        
        String sql = "SELECT * FROM users WHERE username = ? AND password = ?";
        pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, username);
        pstmt.setString(2, password); // 注意：实际应用中应使用加密后的密码
        
        rs = pstmt.executeQuery();
        
        if (rs.next()) {
            out.println("Login successful!");
        } else {
            out.println("Invalid username or password.");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        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) {}
    }
%>