多線程爬蟲實戰

普通爬蟲

from urllib import request, error
import re

headers = ('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0')
opener = request.build_opener()
opener.addheaders = [headers]
request.install_opener(opener)

for i in range(1, 2):
    url = 'http://xiaohua.zol.com.cn/new/' + str(i) + '.html'
    file = './data/' + str(i) + '.html'
    try:
        data = request.urlopen(url).read().decode('utf-8', 'ignore')
        pat = 'target="_blank" href="(.*?)" class="all-read"'
        ret = re.compile(pat).findall(data)
        # 爬取笑話網全文
        for j in range(0, len(ret)):
            all_url = 'http://xiaohua.zol.com.cn' + ret[j]
            all_data = request.urlopen(all_url).read().decode('gbk', 'ignore')
            all_pat = '<p></p>(.*?)<p></p>'
            # re.S，讓.匹配換行
            all_ret = re.compile(all_pat, re.S).findall(all_data)
            print(all_ret)
    except error.URLError as e:
        if hasattr(e, 'code'):
            print(e.code)
        if hasattr(e, 'reason'):
            print(e.reason)
    except Exception as e:
        print(e)

多線程爬蟲

多線程

import threading


# 定義A、B線程
class A(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)

    def run(self):
        for i in range(0, 100):
            print('我是A菜')


class B(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)

    def run(self):
        for i in range(0, 10):
            print('我是B菜')


# 開啓線程
t1 = A()
t1.start()
t2 = B()
t2.start()

多線程爬蟲

from urllib import request, error
import re
import threading

headers = ('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0')
opener = request.build_opener()
opener.addheaders = [headers]
request.install_opener(opener)


class One(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)

    def run(self):
        # 爬取奇數頁
        for i in range(1, 30, 2):
            get_data(i)


class Two(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)

    def run(self):
        # 爬取偶數頁
        for i in range(2, 30, 2):
            get_data(i)


def get_data(i):
    url = 'http://xiaohua.zol.com.cn/new/' + str(i) + '.html'
    try:
        data = request.urlopen(url).read().decode('utf-8', 'ignore')
        pat = 'target="_blank" href="(.*?)" class="all-read"'
        ret = re.compile(pat).findall(data)
        # 爬取笑話網全文
        for j in range(0, len(ret)):
            all_url = 'http://xiaohua.zol.com.cn' + ret[j]
            all_data = request.urlopen(all_url).read().decode('gbk', 'ignore')
            all_pat = '<p></p>(.*?)<p></p>'
            # re.S，讓.匹配換行
            all_ret = re.compile(all_pat, re.S).findall(all_data)
            print(all_ret)
    except error.URLError as e:
        if hasattr(e, 'code'):
            print(e.code)
        if hasattr(e, 'reason'):
            print(e.reason)
    except Exception as e:
        print(e)


a = One()
b = Two()
a.start()
b.start()