我尝试使用以下代码从我们的电话提供商的 Web 应用程序中抓取通话记录，以将信息输入到我的 Ruby on Rails 应用程序中。
desc "Import incoming calls"
task :fetch_incomingcalls => :environment do
# Logs into manage.phoneprovider.co.uk and retrieved list of incoming calls.
require 'rubygems'
require 'mechanize'
require 'logger'
# Create a new mechanize object
agent = Mechanize.new { |a| a.log = Logger.new(STDERR) }
# Load the Phone Provider website
page = agent.get("https://manage.phoneprovider.co.uk/login")
# Select the first form
form = agent.page.forms.first
form.username = 'username
form.password = 'password
# Submit the form
page = form.submit form.buttons.first
# Click on link called Call Logs
page = agent.page.link_with(:text => "Call Logs").click
# Click on link called Incoming Calls
page = agent.page.link_with(:text => "Incoming Calls").click
# Prints out table rows
# puts doc.css('table > tr')
# Print out the body as a test
# puts page.body
end
正如您从最后五行中看到的那样，我已经测试过“puts page.body”可以成功运行并且上面的代码可以运行。它成功登录，然后导航到“调用日志”，然后导航到“来电”。来电表如下所示:
| Timestamp | Source | Destination | Duration |
| 03 Jan 13:40 | 12345678 | 12345679 | 00:01:01 |
| 03 Jan 13:40 | 12345678 | 12345679 | 00:01:01 |
| 03 Jan 13:40 | 12345678 | 12345679 | 00:01:01 |
| 03 Jan 13:40 | 12345678 | 12345679 | 00:01:01 |
由以下代码生成:
<thead>
<tr>
<td>Timestamp</td>
<td>Source</td>
<td>Destination</td>
<td>Duration</td>
<td>Cost</td>
<td class='centre'>Recording</td>
</tr>
</thead>
<tbody>
<tr class='o'>
<tr>
<td>03 Jan 13:40</td>
<td>12345678</td>
<td>12345679</td>
<td>00:01:14</td>
<td></td>
<td class='opt recording'>
</td>
</tr>
</tr>
<tr class='e'>
<tr>
<td>30 Dec 20:31</td>
<td>12345678</td>
<td>12345679</td>
<td>00:02:52</td>
<td></td>
<td class='opt recording'>
</td>
</tr>
</tr>
<tr class='o'>
<tr>
<td>24 Dec 00:03</td>
<td>12345678</td>
<td>12345679</td>
<td>00:00:09</td>
<td></td>
<td class='opt recording'>
</td>
</tr>
</tr>
<tr class='e'>
<tr>
<td>23 Dec 14:56</td>
<td>12345678</td>
<td>12345679</td>
<td>00:00:07</td>
<td></td>
<td class='opt recording'>
</td>
</tr>
</tr>
<tr class='o'>
<tr>
<td>21 Dec 13:26</td>
<td>07793770851</td>
<td>12345679</td>
<td>00:00:26</td>
<td></td>
<td class='opt recording'>
</td>
</tr>
</tr>
我正在尝试找出如何只选择我想要的单元格(时间戳、源、目标和持续时间)并输出它们。然后我可以担心将它们输出到数据库而不是终端。
我尝试过使用 Selector Gadget，但如果我选择多个，它只会显示 'td' 或 'tr:nth-child(6) td , tr:nth-child(2) td'。
如有任何帮助或指点，我们将不胜感激!
最佳答案
表中有一个模式可以很容易地利用 XPath。具有所需信息的行的 <tr> 标记缺少 class 属性。幸运的是，XPath 提供了一些简单的逻辑操作，包括 not() 。这恰好提供了我们需要的功能。
一旦我们减少了要处理的行数，我们就可以遍历行并使用 XPath 的 element[n] 选择器提取必要列的文本。这里有一个重要的注意事项是 XPath 从 1 开始计算元素，因此表行的第一列将是 td[1] 。
使用 Nokogiri(和规范)的示例代码:
require "rspec"
require "nokogiri"
HTML = <<HTML
<table>
<thead>
<tr>
<td>
Timestamp
</td>
<td>
Source
</td>
<td>
Destination
</td>
<td>
Duration
</td>
<td>
Cost
</td>
<td class='centre'>
Recording
</td>
</tr>
</thead>
<tbody>
<tr class='o'>
<td></td>
</tr>
<tr>
<td>
03 Jan 13:40
</td>
<td>
12345678
</td>
<td>
12345679
</td>
<td>
00:01:14
</td>
<td></td>
<td class='opt recording'></td>
</tr>
<tr class='e'>
<td></td>
</tr>
<tr>
<td>
30 Dec 20:31
</td>
<td>
12345678
</td>
<td>
12345679
</td>
<td>
00:02:52
</td>
<td></td>
<td class='opt recording'></td>
</tr>
<tr class='o'>
<td></td>
</tr>
<tr>
<td>
24 Dec 00:03
</td>
<td>
12345678
</td>
<td>
12345679
</td>
<td>
00:00:09
</td>
<td></td>
<td class='opt recording'></td>
</tr>
<tr class='e'>
<td></td>
</tr>
<tr>
<td>
23 Dec 14:56
</td>
<td>
12345678
</td>
<td>
12345679
</td>
<td>
00:00:07
</td>
<td></td>
<td class='opt recording'></td>
</tr>
<tr class='o'>
<td></td>
</tr>
<tr>
<td>
21 Dec 13:26
</td>
<td>
07793770851
</td>
<td>
12345679
</td>
<td>
00:00:26
</td>
<td></td>
<td class='opt recording'></td>
</tr>
</tbody>
</table>
HTML
class TableExtractor
def extract_data html
Nokogiri::HTML(html).xpath("//table/tbody/tr[not(@class)]").collect do |row|
timestamp = row.at("td[1]").text.strip
source = row.at("td[2]").text.strip
destination = row.at("td[3]").text.strip
duration = row.at("td[4]").text.strip
{:timestamp => timestamp, :source => source, :destination => destination, :duration => duration}
end
end
end
describe TableExtractor do
before(:all) do
@html = HTML
end
it "should extract the timestamp properly" do
subject.extract_data(@html)[0][:timestamp].should eq "03 Jan 13:40"
end
it "should extract the source properly" do
subject.extract_data(@html)[0][:source].should eq "12345678"
end
it "should extract the destination properly" do
subject.extract_data(@html)[0][:destination].should eq "12345679"
end
it "should extract the duration properly" do
subject.extract_data(@html)[0][:duration].should eq "00:01:14"
end
it "should extract all informational rows" do
subject.extract_data(@html).count.should eq 5
end
end
关于html - 使用 Nokogiri 和 Mechanize 解析 html 表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8749101/