jsp评价系统源码

// 示例代码：使用JDBC连接数据库并执行查询
String sql = "SELECT * FROM reviews WHERE product_id = ?";
try (Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
     PreparedStatement pstmt = conn.prepareStatement(sql)) {
    pstmt.setInt(1, productId);
    ResultSet rs = pstmt.executeQuery();
    while (rs.next()) {
        // 处理结果集
    }
} catch (SQLException e) {
    e.printStackTrace();
}

<!-- 示例代码：分页显示评价 -->
<c:forEach items="${reviews}" var="review" begin="${(currentPage-1)*pageSize}" end="${currentPage*pageSize-1}">
    <div>${review.content}</div>
</c:forEach>

// 示例代码：使用PreparedStatement防止SQL注入
String sql = "INSERT INTO reviews (product_id, user_id, rating, comment) VALUES (?, ?, ?, ?)";
try (Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
     PreparedStatement pstmt = conn.prepareStatement(sql)) {
    pstmt.setInt(1, productId);
    pstmt.setInt(2, userId);
    pstmt.setInt(3, rating);
    pstmt.setString(4, comment);
    pstmt.executeUpdate();
} catch (SQLException e) {
    e.printStackTrace();
}