如何从 HTML 表格中提取单元格并根据 Java 中表格行中的其他单元格进行组织？

【问题标题】：How do I extract cells from HTML Tables and organize based on other cells in table row in Java?如何从 HTML 表格中提取单元格并根据 Java 中表格行中的其他单元格进行组织？
【发布时间】：2014-05-20 11:36:09
【问题描述】：

我从网站中提取了以下 HTML。我将所有这些 HTML 存储为 Java 中的字符串变量，我希望能够查看每个表格行，如果该表格中有任何带有“当前分配报告”字样的数据单元格，那么它将查看另一个该表中的数据单元格并将课程名称添加到 ArrayList 并将数字存储在 javascript:rlViewItm 之后的 href 中，并将这些数字添加到另一个 ArrayList。这是该行的一个示例：

<a href="javascript:rlViewItm('2049144736880355316');">View</a>

我将提供一个示例来阐明我想要得到的东西。它首先会开始查看下面的 html，它是一个字符串。它会查看每个表格，然后分别查看每个单独的表格行。如果有一个表格行的表格数据单元格显示“当前分配报告”，那么它将查看该表格行中的其他数据单元格，并找到下面写的只有数字被更改的行。我希望将这些数字存储在单独的 arrayList 中。 

<a href="javascript:rlViewItm('2049145027227690148');">View</a>

我以前在 Java 中使用过对字符串进行排序，但我不明白如何根据 HTML 表的特定条件将每个内容单独存储到 ArrayList 中。

我将非常感谢任何可以在 Java 中执行此操作的人的帮助！

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<td valign="center">&nbsp;</td><td>
          10/04/13
        </td><td>
          <a href="javascript:rlViewItm('2049144777895089844');">View</a>
        </td><td>
    <a class="lochomepage" href="/pages/Local_High_School/Classes/9151_0027"> 
      HOMEROOM
      </a> 
    </td><td>

            Interim Report MP1 as of Sep 27
        </td><td class="ed-tdEnd">&nbsp;</td></tr>

    </tbody>
</table>

【问题讨论】：

    标签： java html regex arraylist


    【解决方案1】：

    免责声明： Do not use regular expressions to parse HTML.

    如果 HTML 的格式与您发布的代码中的格式一样严格，您可以按照以下步骤操作：

    使用Pattern.DOTALL 标志，搜索整个字符串

    <tr>(.*?)<td> Current Assignments Report </td>.*?</tr>

    使用Matcher.find() 迭代每个匹配项，将每个分配的数据放入捕获组一。示例匹配：

     <td>
  <div class="ed-tdSpacer"></div></td>
 <td valign="center">&nbsp;</td>
 <td> 04/02/14 </td>
 <td> <a href="javascript:rlViewItm('2049145027229871460');">View</a> </td>
 <td> <a class="lochomepage" href="/pages/Local_High_School/Classes/3538_0001"> Item 6 </a> </td>

    在此文本中，搜索&lt;td&gt; (.*?) &lt;/td&gt; 的每个实例。每个数据项的内容都放在 its 捕获组一中。搜索上述文本会得到以下匹配项：

    04/02/14
<a href="javascript:rlViewItm('2049145027229871460');">View</a>
<a class="lochomepage" href="/pages/Local_High_School/Classes/3538_0001"> Item 6 </a>

    日期几乎可以按原样获取，其他两项将需要根据您想要从中获取的内容进行解析。

    但同样，如果您的输入真的像您暗示的那样严格，那应该不会那么糟糕。

    更新：根据您最近的输入（您发布的长文件），此正则表达式捕获每个项目，据我了解您的需求：

    <td>\s*?Current Assignments Report.*?<td>\s*?([0-9]{2}/[0-9]{2}/[0-9]{2}).*?<a href="javascript:rlViewItm\('([0-9]+)'\);">View</a>.*?<a class="lochomepage" href="([^"]+)">\s*([\w ]+)\s*</a>

    Debuggex Demo

    注意这需要一段时间来加载，因为输入太长了。

    捕获组：

    1. 日期
    2. 商品编号
    3. lochomepage 网址
    4. 链接显示

    我知道你问这个问题已经有一段时间了。也许它仍然有帮助......

    【讨论】：

    • 非常感谢您的回复，但是当我尝试无法成功访问所有表行时，项目 # 只弹出了几个，知道为什么会发生吗？
    • 它们都是以&lt;td&gt;[space] 开头并以[space]&lt;/td&gt; 结尾的吗？
    • 是的，他们都有数据单元格 Current Assignments Report
    • 我需要更多信息才能帮助您。我想你说的是这条线：&lt;a href="javascript:rlViewItm('2049145027229871460');"&gt;View&lt;/a&gt;。 this 行是否总是被&lt;td&gt;[space] 和[space]&lt;/td&gt; 包围？
    • 我修改了我的问题并试图让它更清楚一点，我将非常感谢有关如何解决我的问题的想法。
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