我有以下html代码：

<table id="myTable">
        <tr class="header">
            <th> FLIGHT NUMBER </th>
            <th> AIRLINE </th>
            <th> FROM AIRPORT </th>
            <th> TO AIRPORT </th>
            <th> FLIGHT DATE </th>
            <th> DEPARTURE TIME </th>
            <th> ARRIVING TIME </th>
            <th> BOOK </th>

        </tr>
        #foreach ($flight in $flights)
            <tr>
                <td>$flight.flightNumber</td>
                <td>$flight.airline</td>
                <td>$flight.fromAirportName</td>
                <td>$flight.toAirportName</td>
                <td>$flight.flightDate</td>
                <td>$flight.departureTime</td>
                <td>$flight.arrivingTime</td>
                <td class="topic"><a href="/booking/${flight.flightNumber}">
                    <p style="text-align:center"> BOOK </p></a></td>
            </tr>
        #end
    </table>

我想从java中提取flight.flightnumber。我试过元素，但不知道它到底是怎么工作的。