登录jsp代码下载

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Login Page</title>
</head>
<body>
    <h2>Login</h2>
    <form action="loginProcess.jsp" method="post">
        Username: <input type="text" name="username"><br><br>
        Password: <input type="password" name="password"><br><br>
        <input type="submit" value="Login">
    </form>
</body>
</html>

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

    // 假设我们有一个数据库连接
    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;

    try {
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "dbuser", "dbpass");

        String sql = "SELECT * FROM users WHERE username = ? AND password = ?";
        pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, username);
        pstmt.setString(2, password);

        rs = pstmt.executeQuery();

        if (rs.next()) {
            // 用户验证成功，可以设置会话或重定向到另一个页面
            session.setAttribute("username", username);
            response.sendRedirect("welcome.jsp");
        } else {
            // 用户验证失败，重定向回登录页面
            response.sendRedirect("login.jsp?error=1");
        }
    } 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) {}
    }
%>