Jsoup：从表元素获取链接

Question

这里是表的一部分：

<tr>
   <td width="30" class="woBorder"><p align="center"><font size="3" color="Green"> 3 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-01-15 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=green> 15 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-01-16 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=red> 16 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-01-17 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 17 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-01-18 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 18 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-01-19 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 19 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-01-20 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 20 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-01-21 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 21 </font></td>
   <td class="woBorder">&nbsp</td>     <td width="30" class="woBorder"><p align="center"><font size="3" color="Green"> 7 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-02-12 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 12 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-02-13 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 13 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-02-14 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 14 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-02-15 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 15 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-02-16 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 16 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-02-17 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 17 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-02-18 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 18 </font></td>
   <td class="woBorder">&nbsp</td>     <td width="30" class="woBorder"><p align="center"><font size="3" color="Green"> 11 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-03-12 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 12 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-03-13 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 13 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-03-14 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 14 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-03-15 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 15 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-03-16 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 16 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-03-17 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 17 </font></td>
          <td width="30" class="woBorder"><a href="tran_TripDetail.php?TripDate=2018-03-18 00:00:00&PHPSESSID=sessionID">                      <p align="center"><font size="1" color=black> 18 </font></td>
</tr>

我需要从红色元素中获取url：

<p align="center"><font size="1" color=red> 16 </font></td>

我决定使用jsoup库，下面是我尝试做的：

Document document = Jsoup.connect(siteUrl).execute().parse();

Element table = document.select("table").get(2);
Elements links = table.getElementsByTag("a");
String date = table.select("*[color*='red']").first().toString();
System.out.println("Date: " + date);
for (Element link: links) {
    String url = link.attr("href");
    String text = link.text();

    System.out.println(text + ", " + url);
}

但是这样我就可以得到这个元素和所有的链接。我认为获取所有网址的列表并使用“日期”找到需要的东西不是最聪明的事情。那么，有人能给我一些建议吗，我该如何处理这项任务？

Answer 1

我假设示例中的HTML是一个输入错误，因为它的格式不正确（即a和p标记缺少结束标记）。

如果HTML有效，则以下代码将在选择表元素后获得所需的url：

Element redElement = table.select("*[color*='red']").first();

// Get the sibling (a tag) of its parent (p tag) and get the value of href.
String url = redElement.parent().previousElementSibling().attr("href");
System.out.println("URL: " + url);