demo爬虫

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#!/usr/bin/python
#指明编码
# -*- coding: UTF-8 -*- 

#导入python库
import urllib
import urllib2
import re
import MySQLdb
import json

#定义爬虫类
class crawl1:     
def getHtml(self,url=None):
#代理
user_agent="Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0"
header={"User-Agent":user_agent}
request=urllib2.Request(url,headers=header)
response=urllib2.urlopen(request)
html=response.read()
return html

    def getContent(self,html,reg):
content=re.findall(html, reg, re.S)
return content

     #连接数据库 mysql
def connectDB(self):
host="192.168.85.21"
dbName="test1"
user="root"
password="123456"
#此处添加charset='utf8'是为了在数据库中显示中文,此编码必须与数据库的编码一致
db=MySQLdb.connect(host,user,password,dbName,charset='utf8')
return db
cursorDB=db.cursor()
return cursorDB

      #创建表,SQL语言。CREATE TABLE IF NOT EXISTS 表示:表createTableName不存在时就创建
def creatTable(self,createTableName):
createTableSql="CREATE TABLE IF NOT EXISTS "+ createTableName+"(time VARCHAR(40),title VARCHAR(100),text  VARCHAR(40),clicks VARCHAR(10))" 
DB_create=self.connectDB()
cursor_create=DB_create.cursor()
cursor_create.execute(createTableSql)
DB_create.close()
print 'creat table '+createTableName+' successfully'      
return createTableName 

    #数据插入表中
def inserttable(self,insertTable,insertTime,insertTitle,insertText,insertClicks):
insertContentSql="INSERT INTO "+insertTable+"(time,title,text,clicks)VALUES(%s,%s,%s,%s)"
#         insertContentSql="INSERT INTO "+insertTable+"(time,title,text,clicks)VALUES("+insertTime+" , "+insertTitle+" , "+insertText+" , "+insertClicks+")"


DB_insert=self.connectDB()
cursor_insert=DB_insert.cursor()        
cursor_insert.execute(insertContentSql,(insertTime,insertTitle,insertText,insertClicks))
DB_insert.commit()
DB_insert.close()
print 'inert contents to  '+insertTable+' successfully'  

url="baoliao.hb.qq.com/api/report/…"


#正则表达式,获取js,时间,标题,文本内容,点击量(浏览次数)
reg_jason=r'.*?jQuery.*?\((.*)\)'
reg_time=r'.*?"create_time":"(.*?)"'
reg_title=r'.*?"title":"(.*?)".*?'
reg_text=r'.*?"content":"(.*?)".*?'
reg_clicks=r'.*?"counter_clicks":"(.*?)"'

#实例化crawl()对象
crawl=crawl1()
html=crawl.getHtml(url)
html_jason=re.findall(reg_jason, html, re.S)

html_need=json.loads(html_jason[0])

print len(html_need)
print len(html_need['data']['list'])


table=crawl.creatTable('yh1')
for i in range(len(html_need['data']['list'])):
creatTime=html_need['data']['list'][i]['create_time']
title=html_need['data']['list'][i]['title']
content=html_need['data']['list'][i]['content']
clicks=html_need['data']['list'][i]['counter_clicks']
crawl.inserttable(table,creatTime,title,content,clicks)