在科研学习的过程中，我们难免需要查询相关的文献资料，而想必很多小伙伴都知道SCI-HUB，此乃一大神器，它可以帮助我们搜索相关论文并下载其原文。可以说，SCI-HUB造福了众多科研人员，用起来也是“美滋滋”。

然而，当师姐告诉我：“xx，可以帮我下载几篇文献嘛?”。乐心助人的我自当是满口答应了，心想：“这种小事就交给我叭~”

于是乎，我收到了一个excel文档，66篇论文的列表安静地趟在里面(此刻心中碎碎念：“这尼玛，是几篇嘛...”)。我粗略算了一下，复制、粘贴、下载，一套流程走下来，每篇论文少说也得30秒，66篇的话....啊，这不能忍！

很显然，一篇一篇的下载，不是我的风格所以，我决定写一个论文下载器助我前行。

一、代码分析

代码分析的详细思路跟以往依旧如此雷同，逃不过的还是：抓包分析->模拟请求->代码整合。由于一会儿kimol君还得去搬砖，今天就不详细展开了。

1. 搜索论文

通过论文的URL、PMID、DOI号或者论文标题等搜索到对应的论文，并通过bs4库找出PDF原文的链接地址，代码如下：

def search_article(artName):

"""

搜索论文

---------------

输入：论文名

---------------

输出：搜索结果(如果没有返回""，否则返回PDF链接)

"""

url = "https://www.sci-hub.ren/"

headers = {"User-Agent":"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0",

"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",

"Accept-Language":"zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",

"Accept-Encoding":"gzip, deflate, br",

"Content-Type":"application/x-www-form-urlencoded",

"Content-Length":"123",

"Origin":"https://www.sci-hub.ren",

"Connection":"keep-alive",

"Upgrade-Insecure-Requests":"1"}

data = {"sci-hub-plugin-check":"",

"request":artName}

res = requests.post(url, headers=headers, data=data)

html = res.text

soup = BeautifulSoup(html, "html.parser")

iframe = soup.find(id="pdf")

if iframe == None: # 未找到相应文章

return ""

else:

downUrl = iframe["src"]

if "http" not in downUrl:

downUrl = "https:"+downUrl

return downUrl

2. 下载论文

得到了论文的链接地址之后，只需要通过requests发送一个请求，即可将其下载：

def download_article(downUrl):

"""

根据论文链接下载文章

----------------------

输入：论文链接

----------------------

输出：PDF文件二进制

"""

headers = {"User-Agent":"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0",

"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",

"Accept-Language":"zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",

"Accept-Encoding":"gzip, deflate, br",

"Connection":"keep-alive",

"Upgrade-Insecure-Requests":"1"}

res = requests.get(downUrl, headers=headers)

return res.content

二、完整代码

将上述两个函数整合之后，我的完整代码如下：

# -*- coding: utf-8 -*-

"""

Created on Tue Jan 5 16:32:22 2021

@author: kimol_love

"""

import os

import time

import requests

from bs4 import BeautifulSoup

def search_article(artName):

"""

搜索论文

---------------

输入：论文名

---------------

输出：搜索结果(如果没有返回""，否则返回PDF链接)

"""

url = "https://www.sci-hub.ren/"

headers = {"User-Agent":"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0",

"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",

"Accept-Language":"zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",

"Accept-Encoding":"gzip, deflate, br",

"Content-Type":"application/x-www-form-urlencoded",

"Content-Length":"123",

"Origin":"https://www.sci-hub.ren",

"Connection":"keep-alive",

"Upgrade-Insecure-Requests":"1"}

data = {"sci-hub-plugin-check":"",

"request":artName}

res = requests.post(url, headers=headers, data=data)

html = res.text

soup = BeautifulSoup(html, "html.parser")

iframe = soup.find(id="pdf")

if iframe == None: # 未找到相应文章

return ""

else:

downUrl = iframe["src"]

if "http" not in downUrl:

downUrl = "https:"+downUrl

return downUrl

def download_article(downUrl):

"""

根据论文链接下载文章

----------------------

输入：论文链接

----------------------

输出：PDF文件二进制

"""

headers = {"User-Agent":"Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0",

"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",

"Accept-Language":"zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",

"Accept-Encoding":"gzip, deflate, br",

"Connection":"keep-alive",

"Upgrade-Insecure-Requests":"1"}

res = requests.get(downUrl, headers=headers)

return res.content

def welcome():

"""

欢迎界面

"""

os.system("cls")

title = """

_____ _____ _____ _ _ _ _ ____

/ ____|/ ____|_ _| | | | | | | | _

| (___ | | | |______| |__| | | | | |_) |

\___ | | | |______| __ | | | | _ <

____) | |____ _| |_ | | | | |__| | |_) |

|_____/ \_____|_____| |_| |_|\____/|____/

"""

print(title)

if __name__ == "__main__":

while True:

welcome()

request = input("请输入URL、PMID、DOI或者论文标题：")

print("搜索中...")

downUrl = search_article(request)

if downUrl == "":

print("未找到相关论文，请重新搜索！")

else:

print("论文链接：%s"%downUrl)

print("下载中...")

pdf = download_article(downUrl)

with open("%s.pdf"%request, "wb") as f:

f.write(pdf)

print("---下载完成---")

time.sleep(0.8)

不出所料，代码一跑，我便轻松完成了师姐交给我的任务，不香嘛？

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