高级HTML Agility Pack用法

Question

高级HTML Agility Pack用法

Wil*_*ill 2 c# screen-scraping html-agility-pack

我对HTML Agility Pack很陌生,所以我需要一些帮助来解决下一步的问题.我可以做一些简单的事情,比如从一个href中提取一个值(知道我正在寻找的url字符串),并且我可以根据正在使用的特定类来调整范围中的值.但是我不明白如何在有大量或标签的情况下使用HTML Agility Pack,而不是一个真正的固定锚来绑定？

这是我正在研究的实际代码块.我在单元格中放置了虚拟数据来演示我在寻找什么.

提取以下内容的最佳方法是什么:

1.)公司名称？

2.)电话号码？

3.)电子邮件地址？

HTML ....

<td>
  <!-- Company Info -->
  <table cellpadding="0" cellspacing="0" border="0">
    <tr>
      <td class="black">
        <table cellspacing="1" cellpadding="0" border="0" width="370">
          <tr>
            <th>COMPANY NAME</th>
          </tr>
          <tr>
            <td class="search">
              <table cellpadding="5" cellspacing="0" border="0" width="100%">
                <tr>
                  <td>
                    <table cellpadding="1" cellspacing="0" border="0" width="100%">
                      <tr>
                        <td colspan="2" align="center">Un-needed Links...</td>
                      </tr>
                      <tr>
                        <td align="center" colspan="2"><hr></td>
                      </tr>
                      <tr>
                        <td align="right" nowrap>
                          <b>
                            <font color="FF0000">
                              Contact Person&nbsp;
                              <img src="/images/icon_contact.gif" align="absmiddle">&nbsp;:
                            </font>
                          </b>
                        </td>
                        <td align="left" width="100%">&nbsp;Judy Smith</td>
                      </tr>
                      <tr>
                        <td align="right" nowrap>
                        <b><font color="FF0000">Phone Number&nbsp;<img src="/images/icon_phone.gif" align="absmiddle">&nbsp;:</font></b></td>
                        <td align="left" width="100%">&nbsp;555-555-5555</td>
                      </tr>
                      <tr>
                        <td align="right" nowrap><b><font color="FF0000">E-mail Address&nbsp;<img src="/images/icon_email.gif" align="absmiddle">&nbsp;:</font></b></td>
                        <td align="left" width="100%">&nbsp;<a HREF="mailto:judy.smith@companyname.com">judy.smith@companyname.com</a></td>
                      </tr>
                      <tr>
                        <td align="center" colspan="2"><hr></td>
                      </tr>
                      <tr>
                        <td align="right" nowrap><b><font color="FF0000">Home Office Location&nbsp;<img src="/images/icon_home.gif" align="absmiddle">&nbsp;:</font></b></td>
                        <td align="left" width="100%">&nbsp;ATLANTA, GA</td>
                      </tr>
                      <tr>
                        <td align="right" nowrap><b><font color="FF0000">Home Office Phone&nbsp;<img src="/images/icon_home.gif" align="absmiddle">&nbsp;:</font></b></td>
                        <td align="left" width="100%">&nbsp;555-555-5555</td>
                      </tr>
                      <tr>
                        <td align="right" nowrap><b><font color="FF0000">Home Office Fax&nbsp;<img src="/images/icon_home.gif" align="absmiddle">&nbsp;:</font></b></td>
                        <td align="left" width="100%">&nbsp;666-666-6666</td>
                      </tr>
                      <tr>
                        <td align="center" colspan="2"><hr></td>
                      </tr>
                      <tr>
                        <td align="right" nowrap><b><font color="FF0000">Broker MC Number&nbsp;<img src="/images/icon_number.gif" align="absmiddle">&nbsp;:</font></b></td>
                        <td align="left" width="100%">&nbsp;123456</td>
                      </tr>
                      <tr>
                        <td align="right" nowrap><b><font color="FF0000">Carrier MC Number&nbsp;<img src="/images/icon_number.gif" align="absmiddle">&nbsp;:</font></b></td>
                        <td align="left" width="100%">&nbsp;654321</td>
                      </tr>
                    </table>
                  </td>
                </tr>
              </table>
            </td>
          </tr>
        </table>
      </td>
    </tr>
  </table>
  <br>

  <!-- Starting Point -->
  <table cellpadding="0" cellspacing="0" border="0">
    <tr>
      <td class="black">
        <table cellspacing="1" cellpadding="0" border="0" width="370">
          <tr>
            <th>Starting Point</th>
            <th>Available</th>
          </tr>
          <tr>
            <td class="search" width="270">&nbsp;<b>ABBEVILLE, GA&nbsp;</b></td>
            <td class="search" align="center" width="100"><span style="color: forestgreen">&nbsp;1/5/11&nbsp;</span></td>
          </tr>
        </table>
      </td>
    </tr>

  </table>
  <br>
  <!-- Destination Point -->
  <table cellpadding="0" cellspacing="0" border="0">
    <tr>
      <td class="black">
        <table cellspacing="1" cellpadding="0" border="0" width="370">
          <tr>
            <th>Destination Point</th>
            <th>Direction</th>
          </tr>
          <tr>
            <td class="search" width="270">&nbsp;<b>ATLANTA, GA&nbsp;</b></td>
            <td class="search" align="center" width="100"><span style="color: FF0000">&nbsp;&nbsp;</span></td>
          </tr>
        </table>
      </td>

    </tr>
  </table>
  <br>
  <!-- Truck Details -->
  <table cellpadding="0" cellspacing="0" border="0">
    <tr>
      <td class="black">
        <table cellspacing="1" cellpadding="0" border="0" width="370">
          <tr>
            <th>Truck Details</th>
          </tr>
          <tr>
            <td class="search">
              <table cellpadding="5" cellspacing="0" border="0">
                <tr>
                  <td>
                    <table cellpadding="0" cellspacing="0" border="0">
                      <tr>
                        <td align="right"><b>Date Posted&nbsp;:</b></td>
                        <td align="left">&nbsp;&nbsp;1/5/2011 10:34:48 AM</td>
                      </tr>
                      <tr>
                        <td align="right"><b>Quantity&nbsp;:</b></td>
                        <td align="left">&nbsp;&nbsp;1</td>
                      </tr>
                      <tr>
                        <td align="right"><b>Equipment Type&nbsp;:</b></td>
                        <td align="left">&nbsp;&nbsp;FT</td>
                      </tr>
                      <tr>
                        <td align="right"><b>Load Size&nbsp;:</b></td>
                        <td align="left">&nbsp;&nbsp;Full</td>
                      </tr>
                      <tr>
                        <td align="right" valign="top"><b>Special Information&nbsp;:</b></td>
                        <td align="left">&nbsp;&nbsp;</td>
                      </tr>
                    </table>
                  </td>
                </tr>
              </table>
            </td>
          </tr>
        </table>
      </td>
    </tr>
  </table>
  <br>
</td>

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....更多HTML

Answer 1

Sim*_*ier 5

那么,你必须要了解XPATH才能真正采用HTML敏捷包抓取功能的优点:-)你可以在Google上开始使用XPATH示例.

专注于屏幕抓取问题,棘手的部分是选择您认为最想要获得的信息的判别式xpath表达式.大多数情况下,不仅有一个解决方案,而且您必须准备好更新代码以坚持目标站点HTML演变.

因此,这是一种非常简单的表达方式之间的折衷,它们存在与不需要的文本匹配的风险,以及过于歧视的表达方式,不能容忍被删除的HTML中的演变,存在它们无法匹配的风险.

至于你的特定文本,这是一个很好的真实世界的例子,这里是一个代码:

HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(yourText);

string companyName = doc.DocumentNode.SelectSingleNode("/td/table/tr/td/table/tr/th").InnerText;
Console.WriteLine("company name=" + companyName);

// another way
companyName = doc.DocumentNode.SelectSingleNode("//td[@class='black']/table/tr/th").InnerText;
Console.WriteLine("company name=" + companyName);

// a more advanced XPATH expression, means
// "Select a TD tag anywhere in the doc that has a preceding sibling of TD type with a B chid, with a FONT child with inner text starting with 'Phone Number'"
string phoneNumber = doc.DocumentNode.SelectSingleNode("//td[starts-with(preceding-sibling::td/b/font/text(), 'Phone Number')]").InnerText;
Console.WriteLine("phone Number=" + phoneNumber);

// same kind of story but go down the next A tag
string email = doc.DocumentNode.SelectSingleNode("//td[starts-with(preceding-sibling::td/b/font/text(), 'E-mail')]/a").InnerText;
Console.WriteLine("email=" + email);

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PS:请注意HTML Agility Pack总是希望XPATH表达式中使用的标签是小写的,即使它们不在原始HTML文本中.

如您所见,此处使用两个不同的表达式检索公司名称.它们都可以处理样本,但如果在中间的任何地方添加新标记,第一个就无法抗拒.第二个更具有前瞻性,但基于CSS类标记,也可能会发生变化.这总是一种权衡.

电话号码和电子邮件相似但显示了XPATH的强大功能.

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