思路：先单线程爬虫，测试可以成功爬取之后再优化为多线程，最后存入数据库
以爬取郑州市租房信息为例
注意：本实战项目仅以学习为目的，为避免给网站造成太大压力，请将代码中的num修改成较小的数字，并将线程改小
一、单线程爬虫
# 用session取代requests
# 解析库使用bs4
# 并发库使用concurrent
import requests
# from lxml import etree # 使用xpath解析
from bs4 import BeautifulSoup
from urllib import parse
import re
import time
headers = {
'referer': 'https://zz.zu.fang.com/',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36',
'cookie': 'global_cookie=ffzvt3kztwck05jm6twso2wjw18kl67hqft; city=zz; integratecover=1; __utma=147393320.427795962.1613371106.1613371106.1613371106.1; __utmc=147393320; __utmz=147393320.1613371106.1.1.utmcsr=zz.fang.com|utmccn=(referral)|utmcmd=referral|utmcct=/; __utmt_t0=1; __utmt_t1=1; __utmt_t2=1; ASP.NET_SessionId=aamzdnhzct4i5mx3ak4cyoyp; Rent_StatLog=23d82b94-13d6-4601-9019-ce0225c092f6; Captcha=61584F355169576F3355317957376E4F6F7552365351342B7574693561766E63785A70522F56557370586E3376585853346651565256574F37694B7074576B2B34536C5747715856516A4D3D; g_sourcepage=zf_fy^lb_pc; unique_cookie=U_ffzvt3kztwck05jm6twso2wjw18kl67hqft*6; __utmb=147393320.12.10.1613371106'
}
data={
'agentbid':''
}
session = requests.session()
session.headers = headers
# 获取页面
def getHtml(url):
try:
re = session.get(url)
re.encoding = re.apparent_encoding
return re.text
except:
print(re.status_code)
# 获取页面总数量
def getNum(text):
soup = BeautifulSoup(text, 'lxml')
txt = soup.select('.fanye .txt')[0].text
# 取出“共**页”中间的数字
num = re.search(r'\d ', txt).group(0)
return num
# 获取详细链接
def getLink(tex):
soup=BeautifulSoup(text,'lxml')
links=soup.select('.title a')
for link in links:
href=parse.urljoin('https://zz.zu.fang.com/',link['href'])
hrefs.append(href)
# 解析页面
def parsePage(url):
res=session.get(url)
if res.status_code==200:
res.encoding=res.apparent_encoding
soup=BeautifulSoup(res.text,'lxml')
try:
title=soup.select('div .title')[0].text.strip().replace(' ','')
price=soup.select('div .trl-item')[0].text.strip()
block=soup.select('.rcont #agantzfxq_C02_08')[0].text.strip()
building=soup.select('.rcont #agantzfxq_C02_07')[0].text.strip()
try:
address=soup.select('.trl-item2 .rcont')[2].text.strip()
except:
address=soup.select('.trl-item2 .rcont')[1].text.strip()
detail1=soup.select('.clearfix')[4].text.strip().replace('\n\n\n',',').replace('\n','')
detail2=soup.select('.clearfix')[5].text.strip().replace('\n\n\n',',').replace('\n','')
detail=detail1 detail2
name=soup.select('.zf_jjname')[0].text.strip()
buserid=re.search('buserid: \'(\d )\'',res.text).group(1)
phone=getPhone(buserid)
print(title,price,block,building,address,detail,name,phone)
house = (title, price, block, building, address, detail, name, phone)
info.append(house)
except:
pass
else:
print(re.status_code,re.text)
# 获取代理人号码
def getPhone(buserid):
url='https://zz.zu.fang.com/RentDetails/Ajax/GetAgentVirtualMobile.aspx'
data['agentbid']=buserid
res=session.post(url,data=data)
if res.status_code==200:
return res.text
else:
print(res.status_code)
return
if __name__ == '__main__':
start_time=time.time()
hrefs=[]
info=[]
init_url = 'https://zz.zu.fang.com/house/'
num=getNum(getHtml(init_url))
for i in range(0,num):
url = f'https://zz.zu.fang.com/house/i3{i 1}/'
text=getHtml(url)
getLink(text)
print(hrefs)
for href in hrefs:
parsePage(href)
print("共获取%d条数据"%len(info))
print("共耗时{}".format(time.time()-start_time))
session.close()二、优化为多线程爬虫
# 用session取代requests
# 解析库使用bs4
# 并发库使用concurrent
import requests
# from lxml import etree # 使用xpath解析
from bs4 import BeautifulSoup
from concurrent.futures import ThreadPoolExecutor
from urllib import parse
import re
import time
headers = {
'referer': 'https://zz.zu.fang.com/',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36',
'cookie': 'global_cookie=ffzvt3kztwck05jm6twso2wjw18kl67hqft; integratecover=1; city=zz; keyWord_recenthousezz=[{"name":"新密","detailName":"","url":"/house-a014868/","sort":1},{"name":"二七","detailName":"","url":"/house-a014864/","sort":1},{"name":"郑东新区","detailName":"","url":"/house-a0842/","sort":1}]; __utma=147393320.427795962.1613371106.1613558547.1613575774.5; __utmc=147393320; __utmz=147393320.1613575774.5.4.utmcsr=zz.fang.com|utmccn=(referral)|utmcmd=referral|utmcct=/; ASP.NET_SessionId=vhrhxr1tdatcc1xyoxwybuwv; g_sourcepage=zf_fy^lb_pc; Captcha=4937566532507336644D6557347143746B5A6A6B4A7A48445A422F2F6A51746C67516F31357446573052634562725162316152533247514250736F72775566574A2B33514357304B6976343D; __utmt_t0=1; __utmt_t1=1; __utmt_t2=1; __utmb=147393320.9.10.1613575774; unique_cookie=U_0l0d1ilf1t0ci2rozai9qi24k1pkl9lcmrs*4'
}
data={
'agentbid':''
}
session = requests.session()
session.headers = headers
# 获取页面
def getHtml(url):
res = session.get(url)
if res.status_code==200:
res.encoding = res.apparent_encoding
return res.text
else:
print(res.status_code)
# 获取页面总数量
def getNum(text):
soup = BeautifulSoup(text, 'lxml')
txt = soup.select('.fanye .txt')[0].text
# 取出“共**页”中间的数字
num = re.search(r'\d ', txt).group(0)
return num
# 获取详细链接
def getLink(url):
text=getHtml(url)
soup=BeautifulSoup(text,'lxml')
links=soup.select('.title a')
for link in links:
href=parse.urljoin('https://zz.zu.fang.com/',link['href'])
hrefs.append(href)
# 解析页面
def parsePage(url):
res=session.get(url)
if res.status_code==200:
res.encoding=res.apparent_encoding
soup=BeautifulSoup(res.text,'lxml')
try:
title=soup.select('div .title')[0].text.strip().replace(' ','')
price=soup.select('div .trl-item')[0].text.strip()
block=soup.select('.rcont #agantzfxq_C02_08')[0].text.strip()
building=soup.select('.rcont #agantzfxq_C02_07')[0].text.strip()
try:
address=soup.select('.trl-item2 .rcont')[2].text.strip()
except:
address=soup.select('.trl-item2 .rcont')[1].text.strip()
detail1=soup.select('.clearfix')[4].text.strip().replace('\n\n\n',',').replace('\n','')
detail2=soup.select('.clearfix')[5].text.strip().replace('\n\n\n',',').replace('\n','')
detail=detail1 detail2
name=soup.select('.zf_jjname')[0].text.strip()
buserid=re.search('buserid: \'(\d )\'',res.text).group(1)
phone=getPhone(buserid)
print(title,price,block,building,address,detail,name,phone)
house = (title, price, block, building, address, detail, name, phone)
info.append(house)
except:
pass
else:
print(re.status_code,re.text)
# 获取代理人号码
def getPhone(buserid):
url='https://zz.zu.fang.com/RentDetails/Ajax/GetAgentVirtualMobile.aspx'
data['agentbid']=buserid
res=session.post(url,data=data)
if res.status_code==200:
return res.text
else:
print(res.status_code)
return
if __name__ == '__main__':
start_time=time.time()
hrefs=[]
info=[]
init_url = 'https://zz.zu.fang.com/house/'
num=getNum(getHtml(init_url))
with ThreadPoolExecutor(max_workers=5) as t:
for i in range(0,num):
url = f'https://zz.zu.fang.com/house/i3{i 1}/'
t.submit(getLink,url)
print("共获取%d个链接"%len(hrefs))
print(hrefs)
with ThreadPoolExecutor(max_workers=30) as t:
for href in hrefs:
t.submit(parsePage,href)
print("共获取%d条数据"%len(info))
print("耗时{}".format(time.time()-start_time))
session.close()三、使用asyncio进一步优化
# 用session取代requests
# 解析库使用bs4
# 并发库使用concurrent
import requests
# from lxml import etree # 使用xpath解析
from bs4 import BeautifulSoup
from concurrent.futures import ThreadPoolExecutor
from urllib import parse
import re
import time
import asyncio
headers = {
'referer': 'https://zz.zu.fang.com/',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36',
'cookie': 'global_cookie=ffzvt3kztwck05jm6twso2wjw18kl67hqft; integratecover=1; city=zz; keyWord_recenthousezz=[{"name":"新密","detailName":"","url":"/house-a014868/","sort":1},{"name":"二七","detailName":"","url":"/house-a014864/","sort":1},{"name":"郑东新区","detailName":"","url":"/house-a0842/","sort":1}]; __utma=147393320.427795962.1613371106.1613558547.1613575774.5; __utmc=147393320; __utmz=147393320.1613575774.5.4.utmcsr=zz.fang.com|utmccn=(referral)|utmcmd=referral|utmcct=/; ASP.NET_SessionId=vhrhxr1tdatcc1xyoxwybuwv; g_sourcepage=zf_fy^lb_pc; Captcha=4937566532507336644D6557347143746B5A6A6B4A7A48445A422F2F6A51746C67516F31357446573052634562725162316152533247514250736F72775566574A2B33514357304B6976343D; __utmt_t0=1; __utmt_t1=1; __utmt_t2=1; __utmb=147393320.9.10.1613575774; unique_cookie=U_0l0d1ilf1t0ci2rozai9qi24k1pkl9lcmrs*4'
}
data={
'agentbid':''
}
session = requests.session()
session.headers = headers
# 获取页面
def getHtml(url):
res = session.get(url)
if res.status_code==200:
res.encoding = res.apparent_encoding
return res.text
else:
print(res.status_code)
# 获取页面总数量
def getNum(text):
soup = BeautifulSoup(text, 'lxml')
txt = soup.select('.fanye .txt')[0].text
# 取出“共**页”中间的数字
num = re.search(r'\d ', txt).group(0)
return num
# 获取详细链接
def getLink(url):
text=getHtml(url)
soup=BeautifulSoup(text,'lxml')
links=soup.select('.title a')
for link in links:
href=parse.urljoin('https://zz.zu.fang.com/',link['href'])
hrefs.append(href)
# 解析页面
def parsePage(url):
res=session.get(url)
if res.status_code==200:
res.encoding=res.apparent_encoding
soup=BeautifulSoup(res.text,'lxml')
try:
title=soup.select('div .title')[0].text.strip().replace(' ','')
price=soup.select('div .trl-item')[0].text.strip()
block=soup.select('.rcont #agantzfxq_C02_08')[0].text.strip()
building=soup.select('.rcont #agantzfxq_C02_07')[0].text.strip()
try:
address=soup.select('.trl-item2 .rcont')[2].text.strip()
except:
address=soup.select('.trl-item2 .rcont')[1].text.strip()
detail1=soup.select('.clearfix')[4].text.strip().replace('\n\n\n',',').replace('\n','')
detail2=soup.select('.clearfix')[5].text.strip().replace('\n\n\n',',').replace('\n','')
detail=detail1 detail2
name=soup.select('.zf_jjname')[0].text.strip()
buserid=re.search('buserid: \'(\d )\'',res.text).group(1)
phone=getPhone(buserid)
print(title,price,block,building,address,detail,name,phone)
house = (title, price, block, building, address, detail, name, phone)
info.append(house)
except:
pass
else:
print(re.status_code,re.text)
# 获取代理人号码
def getPhone(buserid):
url='https://zz.zu.fang.com/RentDetails/Ajax/GetAgentVirtualMobile.aspx'
data['agentbid']=buserid
res=session.post(url,data=data)
if res.status_code==200:
return res.text
else:
print(res.status_code)
return
# 获取详细链接的线程池
async def Pool1(num):
loop=asyncio.get_event_loop()
task=[]
with ThreadPoolExecutor(max_workers=5) as t:
for i in range(0,num):
url = f'https://zz.zu.fang.com/house/i3{i 1}/'
task.append(loop.run_in_executor(t,getLink,url))
# 解析页面的线程池
async def Pool2(hrefs):
loop=asyncio.get_event_loop()
task=[]
with ThreadPoolExecutor(max_workers=30) as t:
for href in hrefs:
task.append(loop.run_in_executor(t,parsePage,href))
if __name__ == '__main__':
start_time=time.time()
hrefs=[]
info=[]
task=[]
init_url = 'https://zz.zu.fang.com/house/'
num=getNum(getHtml(init_url))
loop = asyncio.get_event_loop()
loop.run_until_complete(Pool1(num))
print("共获取%d个链接"%len(hrefs))
print(hrefs)
loop.run_until_complete(Pool2(hrefs))
loop.close()
print("共获取%d条数据"%len(info))
print("耗时{}".format(time.time()-start_time))
session.close()四、存入Mysql数据库
（一）建表
from sqlalchemy import create_engine from sqlalchemy import String, Integer, Column, Text from sqlalchemy.orm import sessionmaker from sqlalchemy.orm import scoped_session # 多线程爬虫时避免出现线程安全问题 from sqlalchemy.ext.declarative import declarative_base BASE = declarative_base() # 实例化 engine = create_engine( "mysql pymysql://root:root@127.0.0.1:3306/pytest?charset=utf8", max_overflow=300, # 超出连接池大小最多可以创建的连接 pool_size=100, # 连接池大小 echo=False, # 不显示调试信息 ) class House(BASE): __tablename__ = 'house' id = Column(Integer, primary_key=True, autoincrement=True) title=Column(String(200)) price=Column(String(200)) block=Column(String(200)) building=Column(String(200)) address=Column(String(200)) detail=Column(Text()) name=Column(String(20)) phone=Column(String(20)) BASE.metadata.create_all(engine) Session = sessionmaker(engine) sess = scoped_session(Session)
（二）将数据存入数据库中
# 用session取代requests
# 解析库使用bs4
# 并发库使用concurrent
import requests
from bs4 import BeautifulSoup
from concurrent.futures import ThreadPoolExecutor
from urllib import parse
from mysqldb import sess, House
import re
import time
import asyncio
headers = {
'referer': 'https://zz.zu.fang.com/',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36',
'cookie': 'global_cookie=ffzvt3kztwck05jm6twso2wjw18kl67hqft; integratecover=1; city=zz; __utmc=147393320; ASP.NET_SessionId=vhrhxr1tdatcc1xyoxwybuwv; __utma=147393320.427795962.1613371106.1613575774.1613580597.6; __utmz=147393320.1613580597.6.5.utmcsr=zz.fang.com|utmccn=(referral)|utmcmd=referral|utmcct=/; __utmt_t0=1; __utmt_t1=1; __utmt_t2=1; Rent_StatLog=c158b2a7-4622-45a9-9e69-dcf6f42cf577; keyWord_recenthousezz=[{"name":"二七","detailName":"","url":"/house-a014864/","sort":1},{"name":"郑东新区","detailName":"","url":"/house-a0842/","sort":1},{"name":"经开","detailName":"","url":"/house-a014871/","sort":1}]; g_sourcepage=zf_fy^lb_pc; Captcha=6B65716A41454739794D666864397178613772676C75447A4E746C657144775A347A6D42554F446532357649643062344F6976756E563450554E59594B7833712B413579506C4B684958343D; unique_cookie=U_0l0d1ilf1t0ci2rozai9qi24k1pkl9lcmrs*14; __utmb=147393320.21.10.1613580597'
}
data={
'agentbid':''
}
session = requests.session()
session.headers = headers
# 获取页面
def getHtml(url):
res = session.get(url)
if res.status_code==200:
res.encoding = res.apparent_encoding
return res.text
else:
print(res.status_code)
# 获取页面总数量
def getNum(text):
soup = BeautifulSoup(text, 'lxml')
txt = soup.select('.fanye .txt')[0].text
# 取出“共**页”中间的数字
num = re.search(r'\d ', txt).group(0)
return num
# 获取详细链接
def getLink(url):
text=getHtml(url)
soup=BeautifulSoup(text,'lxml')
links=soup.select('.title a')
for link in links:
href=parse.urljoin('https://zz.zu.fang.com/',link['href'])
hrefs.append(href)
# 解析页面
def parsePage(url):
res=session.get(url)
if res.status_code==200:
res.encoding=res.apparent_encoding
soup=BeautifulSoup(res.text,'lxml')
try:
title=soup.select('div .title')[0].text.strip().replace(' ','')
price=soup.select('div .trl-item')[0].text.strip()
block=soup.select('.rcont #agantzfxq_C02_08')[0].text.strip()
building=soup.select('.rcont #agantzfxq_C02_07')[0].text.strip()
try:
address=soup.select('.trl-item2 .rcont')[2].text.strip()
except:
address=soup.select('.trl-item2 .rcont')[1].text.strip()
detail1=soup.select('.clearfix')[4].text.strip().replace('\n\n\n',',').replace('\n','')
detail2=soup.select('.clearfix')[5].text.strip().replace('\n\n\n',',').replace('\n','')
detail=detail1 detail2
name=soup.select('.zf_jjname')[0].text.strip()
buserid=re.search('buserid: \'(\d )\'',res.text).group(1)
phone=getPhone(buserid)
print(title,price,block,building,address,detail,name,phone)
house = (title, price, block, building, address, detail, name, phone)
info.append(house)
try:
house_data=House(
title=title,
price=price,
block=block,
building=building,
address=address,
detail=detail,
name=name,
phone=phone
)
sess.add(house_data)
sess.commit()
except Exception as e:
print(e) # 打印错误信息
sess.rollback() # 回滚
except:
pass
else:
print(re.status_code,re.text)
# 获取代理人号码
def getPhone(buserid):
url='https://zz.zu.fang.com/RentDetails/Ajax/GetAgentVirtualMobile.aspx'
data['agentbid']=buserid
res=session.post(url,data=data)
if res.status_code==200:
return res.text
else:
print(res.status_code)
return
# 获取详细链接的线程池
async def Pool1(num):
loop=asyncio.get_event_loop()
task=[]
with ThreadPoolExecutor(max_workers=5) as t:
for i in range(0,num):
url = f'https://zz.zu.fang.com/house/i3{i 1}/'
task.append(loop.run_in_executor(t,getLink,url))
# 解析页面的线程池
async def Pool2(hrefs):
loop=asyncio.get_event_loop()
task=[]
with ThreadPoolExecutor(max_workers=30) as t:
for href in hrefs:
task.append(loop.run_in_executor(t,parsePage,href))
if __name__ == '__main__':
start_time=time.time()
hrefs=[]
info=[]
task=[]
init_url = 'https://zz.zu.fang.com/house/'
num=getNum(getHtml(init_url))
loop = asyncio.get_event_loop()
loop.run_until_complete(Pool1(num))
print("共获取%d个链接"%len(hrefs))
print(hrefs)
loop.run_until_complete(Pool2(hrefs))
loop.close()
print("共获取%d条数据"%len(info))
print("耗时{}".format(time.time()-start_time))
session.close()五、最终效果图 （已打码）
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