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我无法在 ubuntu 16.04 服务器上实现dryscrape（在数字海洋上进行全新安装） - 目的是抓取 JS 填充的网站。

我正在按照此处的干刮安装说明进行操作：

apt-get update
apt-get install qt5-default libqt5webkit5-dev build-essential \
                  python-lxml python-pip xvfb

pip install dryscrape

然后运行我在此处找到的以下 python 脚本以及同一链接中的测试 html 页面。（它返回 html 或 JS）

Python

import dryscrape
from bs4 import BeautifulSoup
session = dryscrape.Session()
my_url = 'http://www.example.com/scrape.php'
session.visit(my_url)
response = session.body()
soup = BeautifulSoup(response)
soup.find(id="intro-text")

HTML -scrape.php

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Javascript scraping test</title>
</head>
<body>
  <p id='intro-text'>No javascript support</p>
  <script>
     document.getElementById('intro-text').innerHTML = 'Yay! Supports javascript';
  </script> 
</body>
</html>

当我这样做时，我似乎无法获得预期的返回数据，而只是错误。

我想知道我是否有什么明显的遗漏？

注意：我搜索了许多安装指南/线程，但似乎无法正常工作。我也尝试过使用硒，但似乎也无济于事。非常感谢。

输出

Traceback (most recent call last):
  File "js.py", line 3, in <module>
    session = dryscrape.Session()
  File "/usr/local/lib/python2.7/dist-packages/dryscrape/session.py", line 22, in __init__
    self.driver = driver or DefaultDriver()
  File "/usr/local/lib/python2.7/dist-packages/dryscrape/driver/webkit.py", line 30, in __init__
    super(Driver, self).__init__(**kw)
  File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 230, in __init__
    self.conn = connection or ServerConnection()
  File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 507, in __init__
    self._sock = (server or get_default_server()).connect()
  File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 450, in get_default_server
    _default_server = Server()
  File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 424, in __init__
    raise NoX11Error("Could not connect to X server. "
webkit_server.NoX11Error: Could not connect to X server. Try calling dryscrape.start_xvfb() before creating a session.

工作脚本

import dryscrape
from bs4 import BeautifulSoup

dryscrape.start_xvfb()
session = dryscrape.Session()
my_url = 'https://www.example.com/scrape.php'
session.visit(my_url)
response = session.body()
soup = BeautifulSoup(response, "html.parser")
print soup.find(id="intro-text").text
4

1 回答 1

2

您没有运行 X 服务器。线索是

在创建会话之前尝试调用 dryscrape.start_xvfb()

见http://dryscrape.readthedocs.io/en/latest/usage.html

if 'linux' in sys.platform:
    # start xvfb in case no X is running. Make sure xvfb 
    # is installed, otherwise this won't work!
    dryscrape.start_xvfb()

http://dryscrape.readthedocs.io/en/latest/installation.html

xvfb_（仅当没有其他 X 服务器可用时才需要）

所以你可以添加：

dryscrape.start_xvfb()

前：

session = dryscrape.Session()
于 2017-08-07T10:37:18.087 回答