用python爬虫批量下载pdf的实现

# coding = UTF-8
# 爬取李东风PDF文档,网址：http://www.math.pku.edu.cn/teachers/lidf/docs/textrick/index.htm

import urllib.request
import re
import os

# open the url and read
def getHtml(url):
  page = urllib.request.urlopen(url)
  html = page.read()
  page.close()
  return html

# compile the regular expressions and find
# all stuff we need
def getUrl(html):
  reg = r'(?:href|HREF)="?((?:http://)?.+?\.pdf)'
  url_re = re.compile(reg)
  url_lst = url_re.findall(html.decode('gb2312'))
  return(url_lst)

def getFile(url):
  file_name = url.split('/')[-1]
  u = urllib.request.urlopen(url)
  f = open(file_name, 'wb')

  block_sz = 8192
  while True:
    buffer = u.read(block_sz)
    if not buffer:
      break

    f.write(buffer)
  f.close()
  print ("Sucessful to download" + " " + file_name)


root_url = 'http://www.math.pku.edu.cn/teachers/lidf/docs/textrick/'

raw_url = 'http://www.math.pku.edu.cn/teachers/lidf/docs/textrick/index.htm'

html = getHtml(raw_url)
url_lst = getUrl(html)

os.mkdir('ldf_download')
os.chdir(os.path.join(os.getcwd(), 'ldf_download'))

for url in url_lst[:]:
  url = root_url + url
  getFile(url)

# coding = UTF-8
# 爬取自己编写的html链接中的PDF文档,网址：file:///E:/ZjuTH/Documents/pythonCode/pythontest.html

import urllib.request
import re
import os

# open the url and read
def getHtml(url):
  page = urllib.request.urlopen(url)
  html = page.read()
  page.close()
  return html

# compile the regular expressions and find
# all stuff we need
def getUrl(html):
  reg = r'([A-Z]\d+)' #匹配了G176200001
  url_re = re.compile(reg)
  url_lst = url_re.findall(html.decode('UTF-8')) #返回匹配的数组
  return(url_lst)

def getFile(url):
  file_name = url.split('/')[-1]
  u = urllib.request.urlopen(url)
  f = open(file_name, 'wb')

  block_sz = 8192
  while True:
    buffer = u.read(block_sz)
    if not buffer:
      break

    f.write(buffer)
  f.close()
  print ("Sucessful to download" + " " + file_name)


root_url = 'http://pm.zjsti.gov.cn/tempublicfiles/' #下载地址中相同的部分

raw_url = 'file:///E:/ZjuTH/Documents/pythonCode/pythontest.html'

html = getHtml(raw_url)
url_lst = getUrl(html)

os.mkdir('pdf_download')
os.chdir(os.path.join(os.getcwd(), 'pdf_download'))

for url in url_lst[:]:
  url = root_url + url+'/'+url+'.pdf' #形成完整的下载地址
  getFile(url)