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一、搭建Python环境

本帖使用的是Python 2.7
涉及到的模块：spynner, scrapy, bs4, pymmssql

二、要获取的天猫数据

三、数据抓取流程

四、源代码

#coding:utf-8
import spynner
from scrapy.selector import Selector
from bs4 import BeautifulSoup
import random
import pymssql


#------------------------接数据库-----------------------------#
server="localhost"
user="sa"
password = "123456"
conn=pymssql.connect(server,user,password,"TmallData")
if conn:
  print "DataBase connecting successfully!"
else:
  print "DataBase connecting error!"
cursor=conn.cursor()
#----------------------定义网页操作函数--------------------------#
def py_click_element(browser,pos):
  #点击网页中的元素
  #pos example:'a[href="#description" rel="external nofollow" rel="external nofollow" ]'
  browser.click(pos)
  browser.wait(random.randint(3,10))
  return browser

def py_click_xpath(browser,xpath):
  xpath=xpath+'/@href'
  inner_href=Selector(text=browser.html).xpath(xpath).extract()
  pos='a[href="'+str(inner_href[0])+'" rel="external nofollow" ]'
  browser=py_click_element(browser, pos)
  return browser

def py_webpage_load(browser,url):
  browser.load(url,load_timeout=60)
  browser.wait(10)
  return browser

def py_check_element(browser,xpath):
  #按照xpath查找元素，如果存在则返回True，否则返回False
  if Selector(text=browser.html).xpath(xpath).extract()!=[]:
    return True
  else:
    return False

def py_extract_xpath(browser,xpath):
  if py_check_element(browser, xpath):
    return Selector(text=browser.html).xpath(xpath).extract()[0]
  else:
    return "none"

def py_extract_xpaths(browser,xpaths):
  #批量提取网页内容
  length=len(xpaths)
  results=[0]*length
  for i in range(length):
    results[i]=py_extract_xpath(browser, xpaths[i])
  return results

#-----------------------------数据库操作函数---------------------------#


#-----------------------------数据提取函数----------------------------#
def py_getDealReord(doc):
  soup=BeautifulSoup(doc,'lxml')
  tr=soup.find_all('tr')
  total_dealRecord=[([0]*5)for i in range(len(tr))] 
  i=-1
  for this_tr in tr:
    i=i+1
    td_user=this_tr.find_all('td',attrs={'class':"cell-align-l buyer"})
    for this_td in td_user:
      total_dealRecord[i][0]=this_td.getText().strip(' ')
      #print username
    td_style=this_tr.find_all('td',attrs={'class':"cell-align-l style"})
    for this_td in td_style:
      total_dealRecord[i][1]=this_td.getText(',').strip(' ')
      #print style
    td_quantity=this_tr.find_all('td',attrs={'class':"quantity"})
    for this_td in td_quantity:
      total_dealRecord[i][2]=this_td.getText().strip(' ')
      #print quantity
    td_dealtime=this_tr.find_all('td',attrs={'class':"dealtime"})
    for this_td in td_dealtime:
      total_dealRecord[i][3]=this_td.find('p',attrs={'class':"date"}).getText()
      total_dealRecord[i][4]=this_td.find('p',attrs={'class':"time"}).getText()
  return total_dealRecord
#--------------------获取要抓取的所有商品链接-----------------------#
cursor.execute("""
select * from ProductURLs where BrandName='NB'
""")


file=open("H:\\Eclipse\\TmallCrawling\\HTMLParse\\errLog.txt")
InProductInfo=cursor.fetchall()
browser=spynner.Browser()
for temp_InProductInfo in InProductInfo:

  url='https:'+temp_InProductInfo[2]

  BrandName=temp_InProductInfo[0]
  ProductType=temp_InProductInfo[1]
  print BrandName,'\t',ProductType,'\t',url
  #url= 'https://detail.tmall.com/item.htm?id=524425656711&rn=77636d6db8dea5e30060976fdaf9768d&abbucket=19' 

  try:
    browser=py_webpage_load(browser, url)
  except:
    print "Loading webpage failed."
    file.write(url)
    file.write('\n')
    continue

  xpaths=['//*[@id="J_PromoPrice"]/dd/div/span/text()',\
    '//*[@id="J_StrPriceModBox"]/dd/span/text()',\
    '//*[@id="J_DetailMeta"]/div[1]/div[1]/div/div[1]/h2/text()',\
    '//*[@id="J_PostageToggleCont"]/p/span/text()',\
    '//*[@id="J_EmStock"]/text()',\
    '//*[@id="J_CollectCount"]/text()',\
    '//*[@id="J_ItemRates"]/div/span[2]/text()',\
    '//*[@id="J_DetailMeta"]/div[1]/div[1]/div/ul/li[1]/div/span[2]/text()']
  out_ProductInfo=py_extract_xpaths(browser,xpaths)
  browser=py_click_element(browser,'a[href="#description" rel="external nofollow" rel="external nofollow" ]')
  ProductProperty=py_extract_xpath(browser, '//*[@id="J_AttrUL"]')
  soup=BeautifulSoup(ProductProperty,'lxml')
  li=soup.find_all('li')
  prop=''
  for this_li in li:
    prop=prop+this_li.getText()+'\\'
  prop=prop[0:len(prop)-1]
  out_ProductProperty=prop
  print out_ProductProperty
  cursor.execute("""
  Insert into py_ProductInfo values(%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)
  """,(BrandName,ProductType,url,\
     out_ProductInfo[2],out_ProductInfo[1],\
     out_ProductInfo[0],out_ProductInfo[7],\
     out_ProductInfo[1],out_ProductInfo[3],\
     out_ProductInfo[4],out_ProductInfo[5],\
     out_ProductProperty))
  conn.commit()
  Deal_PageCount=0
  browser=py_click_element(browser, 'a[href="#J_DealRecord" rel="external nofollow" ]')
  #browser.browse(True)
  DealRecord=py_extract_xpath(browser, '//*[@id="J_showBuyerList"]/table/tbody')
  out_DealRecord=py_getDealReord(DealRecord)
  for temp_DealRecord in out_DealRecord:
    if str(temp_DealRecord[4])=='0':
      continue
    cursor.execute("""
    Insert into DealRecord values(%s,%s,%s,%s,%s,%s)
    """,(url,temp_DealRecord[0],temp_DealRecord[1],\
       temp_DealRecord[2],temp_DealRecord[3],\
       temp_DealRecord[4]))
    conn.commit()
  Deal_PageCount=Deal_PageCount+1
  print "Page ",Deal_PageCount
  for i in range(6):
    if (i==0) or (i==2):
      continue
    xpath='//*[@id="J_showBuyerList"]/div/div/a['+str(i)+']'
    if py_check_element(browser,xpath):
      browser=py_click_xpath(browser, xpath)
      DealRecord=py_extract_xpath(browser, '//*[@id="J_showBuyerList"]/table/tbody')
      out_DealRecord=py_getDealReord(DealRecord)
      for temp_DealRecord in out_DealRecord:
        if str(temp_DealRecord[4])=='0':
          continue
        cursor.execute("""
        Insert into DealRecord values(%s,%s,%s,%s,%s,%s)
        """,(url,temp_DealRecord[0],temp_DealRecord[1],\
           temp_DealRecord[2],temp_DealRecord[3],\
           temp_DealRecord[4]))
        conn.commit()
      Deal_PageCount=Deal_PageCount+1
      print "Page ",Deal_PageCount
  while py_check_element(browser, '//*[@id="J_showBuyerList"]/div/div/a[6]'):
    browser=py_click_xpath(browser, '//*[@id="J_showBuyerList"]/div/div/a[6]')
    DealRecord=py_extract_xpath(browser, '//*[@id="J_showBuyerList"]/table/tbody')
    out_DealRecord=py_getDealReord(DealRecord)
    for temp_DealRecord in out_DealRecord:
      if str(temp_DealRecord[4])=='0':
        continue
      cursor.execute("""
      Insert into DealRecord values(%s,%s,%s,%s,%s,%s)
      """,(url,temp_DealRecord[0],temp_DealRecord[1],\
         temp_DealRecord[2],temp_DealRecord[3],\
         temp_DealRecord[4]))
      conn.commit()
    Deal_PageCount=Deal_PageCount+1
    print "Page ",Deal_PageCount

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