Python多线程爬虫实战_爬取糗事百科段子的实例

多线程爬虫：即程序中的某些程序段并行执行，

合理地设置多线程，可以让爬虫效率更高

糗事百科段子普通爬虫和多线程爬虫

分析该网址链接得出：

https://www.qiushibaike.com/8hr/page/页码/

多线程爬虫也就和JAVA的多线程差不多，直接上代码

'''
#此处代码为普通爬虫
import urllib.request
import urllib.error
import re
headers = ("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36")
opener = urllib.request.build_opener()
opener.addheaders = [headers]
urllib.request.install_opener(opener)
for i in range(1,2):
 url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/"
 pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore")
 pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>'
 datalist = re.compile(pattern,re.S).findall(pagedata)
 for j in range(0,len(datalist)):
  print("第"+str(i)+"页第"+str(j)+"个段子内容是：")
  print(datalist[j])
'''
'''
#此处为多线程介绍代码
import threading #导入多线程包
class A(threading.Thread): #创建一个多线程A
 def __init__(self):  #必须包含的两个方法之一:初始化线程
  threading.Thread.__init__(self)
 def run(self):   #必须包含的两个方法之一：线程运行方法
  for i in range(0,11):
   print("我是线程A")
class B(threading.Thread): #创建一个多线程A
 def __init__(self):  #必须包含的两个方法之一:初始化线程
  threading.Thread.__init__(self)
 def run(self):   #必须包含的两个方法之一：线程运行方法
  for i in range(0,11):
   print("我是线程B")
t1 = A() #线程实例化
t1.start() #线程运行
t2 = B()
t2.start()
'''

#此处为修改后的多线程爬虫
#使用多线程进行奇偶页的爬取
import urllib.request
import urllib.error
import re
import threading
headers = ("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36")
opener = urllib.request.build_opener()
opener.addheaders = [headers]
urllib.request.install_opener(opener)
class one(threading.Thread): #爬取奇数页内容
 def __init__(self):
  threading.Thread.__init__(self)
 def run(self):
  for i in range(1,12,2):
   url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/"
   pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore")
   pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>'
   datalist = re.compile(pattern,re.S).findall(pagedata)
   for j in range(0,len(datalist)):
    print("第"+str(i)+"页第"+str(j)+"段子内容为：")
    print(datalist[j])

class two(threading.Thread): #爬取奇数页内容
 def __init__(self):
  threading.Thread.__init__(self)
 def run(self):
  for i in range(2,12,2):
   url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/"
   pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore")
   pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>'
   datalist = re.compile(pattern,re.S).findall(pagedata)
   for j in range(0,len(datalist)):
    print("第"+str(i)+"页第"+str(j)+"段子内容为：")
    print(datalist[j])
t1 = one()
t2 = two()
t1.start()
t2.start()

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