Question

我正试图从科学直接下载文章例如：

url = 'http://www.sciencedirect.com/science/article/pii/S1053811913010240'

我可以毫无问题地使用浏览器访问这些文章，但我尝试使用Python的requests，urllib2和mechanize模块但没有成功。由于我需要下载很多文章，因此不能手动执行。

Wget也不起作用。

E.g。

wget http://www.sciencedirect.com/science/article/pii/S1053811913010240

返回：

HTTP request sent, awaiting response... 404 Not Found

任何想法可能是什么问题？

Answer 1

它们可能无法正常工作，因为Web服务器不喜欢用户代理。也许它试图阻止批量下载。

如果您使用wget指定用户代理，则可以使用。使用你的例子。

wget -U "Mozilla/5.0" "https://www.sciencedirect.com/science/article/pii/S1053811913010240"

Answer 2

这是我修改过的一些代码，可以从pyscholar中学习。

#!/usr/bin/python
#author: Bryan Bishop <kanzure@gmail.com>
#date: 2010-03-03
#purpose: given a link on the command line to sciencedirect.com, download the associated PDF and put it in "sciencedirect.pdf" or something
import os
import re
import pycurl
#from BeautifulSoup import BeautifulSoup
from lxml import etree
import lxml.html
from StringIO import StringIO
from string import join, split

user_agent = "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091123 Iceweasel/3.5.5 (like Firefox/3.5.5; Debian-3.5.5-1)"

def interscience(url):
    '''downloads the PDF from sciencedirect given a link to an article'''
    url = str(url)
    buffer = StringIO()

    curl = pycurl.Curl()
    curl.setopt(curl.URL, url)
    curl.setopt(curl.WRITEFUNCTION, buffer.write)
    curl.setopt(curl.VERBOSE, 0)
    curl.setopt(curl.USERAGENT, user_agent)
    curl.setopt(curl.TIMEOUT, 20)
    curl.perform()
    curl.close()

    buffer = buffer.getvalue().strip()
    html = lxml.html.parse(StringIO(buffer))

    pdf_href = []
    for item in html.getroot().iter('a'):
        if (('id' in item.attrib) and  ('href' in item.attrib) and item.attrib['id']=='pdfLink'):
            pdf_href.append(item.attrib['href'])


    pdf_href = pdf_href[0]
    #now let's get the article title

    title_div = html.find("head/title")
    paper_title = title_div.text
    paper_title = paper_title.replace("\n", "")
    if paper_title[-1] == " ": paper_title = paper_title[:-1]
    re.sub('[^a-zA-Z0-9_\-.() ]+', '', paper_title)
    paper_title = paper_title.strip()
    paper_title = re.sub(' ','_',paper_title)

    #now fetch the document for the user
    command = "wget --user-agent=\"pyscholar/blah\" --output-document=\"%s.pdf\" \"%s\"" % (paper_title, pdf_href)
    os.system(command)
    print "\n\n"

interscience("http://www.sciencedirect.com/science/article/pii/S0163638307000628")

从sciencedirect自动下载

2 个答案: