POST URL编码与基于行的文本数据通过Python请求

时间:2014-09-30 22:38:42

标签: python web-scraping mechanize wget scrape

我正在尝试从网站上抓取一些数据而我无法让POST工作,就好像我没有给它输入数据(“appnote”)。

当我检查POST数据时,它看起来相对相同,只是实际webform的POST被称为“URL编码”并列出每个表单输入,而我的标记为“基于行的文本数据”。

这是我的代码:(appnote)和搜索(搜索)是我需要的最相关的部分

import requests
import cookielib


jar = cookielib.CookieJar()
url = 'http://www.vivotek.com/faq/'
headers = {'content-type': 'application/x-www-form-urlencoded'}

post_data = {#'__EVENTTARGET':'',
             #'__EVENTARGUMENT':'',
             '__LASTFOCUS':'',
             '__VIEWSTATE':'',
             '__VIEWSTATEGENERATOR':'',
             '__VIEWSTATEENCRYPTED':'',
             '__PREVIOUSPAGE':'',
             '__EVENTVALIDATION':''
             'ctl00$HeaderUc1$LanguageDDLUc1$ddlLanguage':'en',
             'ctl00$ContentPlaceHolder1$CategoryDDLUc1$DropDownList1':'-1',
             'ctl00$ContentPlaceHolder1$ProductDDLUc1$DropDownList1':'-1',
             'ctl00$ContentPlaceHolder1$Content':'appnote',
             'ctl00$ContentPlaceHolder1$Search':'Search'
            }
response = requests.get(url, cookies=jar)

response = requests.post(url, cookies=jar, data=post_data, headers=headers)

print(response.text)

链接到我在Wireshark中谈论的图像:

我也尝试使用wget,结果相同。

1 个答案:

答案 0 :(得分:2)

主要问题是您没有设置重要的隐藏字段值,例如__VIEWSTATE

为了使用requests工作,您需要解析页面html并获取适当的输入值。

以下是使用BeautifulSoup HTML解析器和requests的解决方案:

from bs4 import BeautifulSoup
import requests

url = 'http://www.vivotek.com/faq/'
query = 'appnote'

headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.124 Safari/537.36'}

session = requests.Session()
response = session.get(url, headers=headers)

soup = BeautifulSoup(response.content)

post_data = {'__EVENTTARGET':'',
             '__EVENTARGUMENT':'',
             '__LASTFOCUS':'',
             '__VIEWSTATE': soup.find('input', id='__VIEWSTATE')['value'],
             '__VIEWSTATEGENERATOR': soup.find('input', id='__VIEWSTATEGENERATOR')['value'],
             '__VIEWSTATEENCRYPTED': '',
             '__PREVIOUSPAGE': soup.find('input', id='__PREVIOUSPAGE')['value'],
             '__EVENTVALIDATION': soup.find('input', id='__EVENTVALIDATION')['value'],

             'ctl00$HeaderUc1$LanguageDDLUc1$ddlLanguage': 'en',
             'ctl00$ContentPlaceHolder1$CategoryDDLUc1$DropDownList1': '-1',
             'ctl00$ContentPlaceHolder1$ProductDDLUc1$DropDownList1': '-1',
             'ctl00$ContentPlaceHolder1$Content': query,
             'ctl00$ContentPlaceHolder1$Search': 'Search'
            }

response = session.post(url, data=post_data, headers=headers)

soup = BeautifulSoup(response.content)
for item in soup.select('a#ArticleShowLink'):
    print item.text.strip()

打印appnote查询的具体结果:

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