Python基于多线程实现抓取数据存入数据库的方法
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2020-09-20
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Python基于多线程实现抓取数据存入数据库的方法基于多线程实现抓取数据存入数据库的方法
主要介绍了Python基于多线程实现抓取数据存入数据库的方法,结合实例形式分析了Python使用数据库类与多线程类进行数据抓取与写入数据库操作的具体使用技巧,需要的朋友
可以参考下
本文实例讲述了Python基于多线程实现抓取数据存入数据库的方法。分享给大家供大家参考，具体如下：
1. 数据库类数据库类
"""
使用须知：
代码中数据表名 aces ，需要更改该数据表名称的注意更改
"""
import pymysql
class Database():
# 设置本地数据库用户名和密码
host = "localhost"
user = "root"
password = ""
database = "test"
port = 3306
charset = "utf8"
cursor=''
connet =''
def __init__(self):
#连接到数据库
self.connet = pymysql.connect(host = self.host , user = self.user,password = self.password , database = self.database, charset = self.charset)
self.cursor = self.connet.cursor()
# #删表
def dropTables(self):
self.cursor.execute('''''drop table if exists aces''')
print("删表")
#建表
def createTables(self):
self.cursor.execute('''''create table if not exists aces
(
asin varchar(11) primary key not null,
checked varchar(200));''')
print("建表")
#保存数据
def save(self,aceslist):
self.cursor.execute("insert into aces ( asin, checked) values(%s,%s)", (aceslist[0],aceslist[1]))
self.connet.commit()
#判断元素是否已经在数据库里，在就返回true ,不在就返回false
def is_exists_asin(self,asin):
self.cursor.execute('select * from aces where asin = %s',asin)
if self.cursor.fetchone() is None:
return False
return True
# db =Database()
2. 多线程任务类多线程任务类
import urllib.parse
import urllib.parse
import urllib.request
from queue import Queue
import time
import random
import threading
import logging
import pymysql
from bs4 import BeautifulSoup
from local_data import Database
#一个模块中存储多个类 AmazonSpeder , ThreadCrawl(threading.Thread), AmazonSpiderJob
class AmazonSpider():
def __init__(self):
self.db = Database()
def randHeader(self):
head_connection = ['Keep-Alive', 'close']
head_accept = ['text/html, application/xhtml+xml, */*']
head_accept_language = ['zh-CN,fr-FR;q=0.5', 'en-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3']
head_user_agent = ['Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko',
'Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36',
'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; rv:11.0) like Gecko)',
'Mozilla/5.0 (Windows; U; Windows NT 5.2) Gecko/2008070208 Firefox/3.0.1',
'Mozilla/5.0 (Windows; U; Windows NT 5.1) Gecko/20070309 Firefox/2.0.0.3',
'Mozilla/5.0 (Windows; U; Windows NT 5.1) Gecko/20070803 Firefox/1.5.0.12',
'Opera/9.27 (Windows NT 5.2; U; zh-cn)',
'Mozilla/5.0 (Macintosh; PPC Mac OS X; U; en) Opera 8.0',
'Opera/8.0 (Macintosh; PPC Mac OS X; U; en)',
'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.12) Gecko/20080219 Firefox/2.0.0.12 Navigator/9.0.0.6',
'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Win64; x64; Trident/4.0)',
'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0)',
'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E)',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Maxthon/4.0.6.2000 Chrome/26.0.1410.43 Safari/537.1 ',
'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E; QQBrowser/7.3.9825.400)',
'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 ',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.92 Safari/537.1 LBBROWSER',
'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0; BIDUBrowser 2.x)',
'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.11 TaoBrowser/3.0 Safari/536.11']
header = {
'Connection': head_connection[0],
'Accept': head_accept[0],
'Accept-Language': head_accept_language[1],
'User-Agent': head_user_agent[random.randrange(0, len(head_user_agent))]
}
return header
def getDataById(self , queryId):
#如果数据库中有的数据，直接返回不处理
if self.db.is_exists_asin(queryId):
return
req = urllib.request.Request(url="https://www.amazon.com/dp/"+str(queryId) , headers=self.randHeader())
webpage = urllib.request.urlopen(req)
html = webpage.read()
soup = BeautifulSoup(html, 'html.parser')
content = soup.find_all("span" , id = "asTitle")
# 加入一种判断，有的asin没有该定位，
if len(content):
# 非空
state = content[0].string
else:
# 列表为空，没有定位到
state = "other"
print(queryId)
print(state)
self.db.save([queryId,state])
class ThreadCrawl(threading.Thread): #ThreadCrawl类继承了Threading.Thread类
def __init__(self, queue): #子类特有属性， queue
FORMAT = time.strftime("[%Y-%m-%d %H:%M:%S]", time.localtime()) + "[AmazonSpider]-----%(message)s------"
logging.basicConfig(level=logging.INFO, format=FORMAT)
threading.Thread.__init__(self)
self.queue = queue
self.spider = AmazonSpider() #子类特有属性spider， 并初始化，将实例用作属性
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