【Python爬虫实战】多线程爬虫---糗事百科段子爬取

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()