Python爬取当当、京东、亚马逊图书信息代码实例

注：1.本程序采用MSSQLserver数据库存储，请运行程序前手动修改程序开头处的数据库链接信息

2.需要bs4、requests、pymssql库支持

3.支持多线程

from bs4 import BeautifulSoup
import re,requests,pymysql,threading,os,traceback 

try:
  conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='root', db='book',charset="utf8")
  cursor = conn.cursor()
except:
  print('\n错误：数据库连接失败') 

#返回指定页面的html信息
def getHTMLText(url):
  try:
    headers = {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36'}
    r = requests.get(url,headers = headers)
    r.raise_for_status()
    r.encoding = r.apparent_encoding
    return r.text
  except:
    return ''
#返回指定url的Soup对象
def getSoupObject(url):
  try:
    html = getHTMLText(url)
    soup = BeautifulSoup(html,'html.parser')
    return soup
  except:
    return ''
#获取该关键字在图书网站上的总页数
def getPageLength(webSiteName,url):
  try:
    soup = getSoupObject(url)
    if webSiteName == 'DangDang':
      a = soup('a',{'name':'bottom-page-turn'})
      return a[-1].string
    elif webSiteName == 'Amazon':
      a = soup('span',{'class':'pagnDisabled'})
      return a[-1].string
  except:
    print('\n错误：获取{}总页数时出错...'.format(webSiteName))
    return -1 

class DangDangThread(threading.Thread):
  def __init__(self,keyword):
    threading.Thread.__init__(self)
    self.keyword = keyword
  def run(self):
    print('\n提示：开始爬取当当网数据...')
    count = 1 

    length = getPageLength('DangDang','http://search.dangdang.com/?key={}'.format(self.keyword))#总页数
    tableName = 'db_{}_dangdang'.format(self.keyword) 

    try:
      print('\n提示：正在创建DangDang表...')
      cursor.execute('create table {} (id int ,title text,prNow text,prPre text,link text)'.format(tableName))
      print('\n提示：开始爬取当当网页面...')
      for i in range(1,int(length)):
        url = 'http://search.dangdang.com/?key={}&page_index={}'.format(self.keyword,i)
        soup = getSoupObject(url)
        lis = soup('li',{'class':re.compile(r'line'),'id':re.compile(r'p')})
        for li in lis:
          a = li.find_all('a',{'name':'itemlist-title','dd_name':'单品标题'})
          pn = li.find_all('span',{'class': 'search_now_price'})
          pp = li.find_all('span',{'class': 'search_pre_price'}) 

          if not len(a) == 0:
            link = a[0].attrs['href']
            title = a[0].attrs['title'].strip()
          else:
            link = 'NULL'
            title = 'NULL' 

          if not len(pn) == 0:
            prNow = pn[0].string
          else:
            prNow = 'NULL' 

          if not len(pp) == 0:
            prPre = pp[0].string
          else:
            prPre = 'NULL'
          sql = "insert into {} (id,title,prNow,prPre,link) values ({},'{}','{}','{}','{}')".format(tableName,count,title,prNow,prPre,link)
          cursor.execute(sql)
          print('\r提示：正在存入当当数据,当前处理id：{}'.format(count),end='')
          count += 1
          conn.commit()
    except:
      pass 

class AmazonThread(threading.Thread):
  def __init__(self,keyword):
    threading.Thread.__init__(self)
    self.keyword = keyword 

  def run(self):
    print('\n提示：开始爬取亚马逊数据...')
    count = 1
    length = getPageLength('Amazon','https://www.amazon.cn/s/keywords={}'.format(self.keyword))#总页数
    tableName = 'db_{}_amazon'.format(self.keyword) 

    try:
      print('\n提示：正在创建Amazon表...')
      cursor.execute('create table {} (id int ,title text,prNow text,link text)'.format(tableName)) 

      print('\n提示：开始爬取亚马逊页面...')
      for i in range(1,int(length)):
        url = 'https://www.amazon.cn/s/keywords={}&page={}'.format(self.keyword,i)
        soup = getSoupObject(url)
        lis = soup('li',{'id':re.compile(r'result_')})
        for li in lis:
          a = li.find_all('a',{'class':'a-link-normal s-access-detail-page a-text-normal'})
          pn = li.find_all('span',{'class': 'a-size-base a-color-price s-price a-text-bold'})
          if not len(a) == 0:
            link = a[0].attrs['href']
            title = a[0].attrs['title'].strip()
          else:
            link = 'NULL'
            title = 'NULL' 

          if not len(pn) == 0:
            prNow = pn[0].string
          else:
            prNow = 'NULL' 

          sql = "insert into {} (id,title,prNow,link) values ({},'{}','{}','{}')".format(tableName,count,title,prNow,link)
          cursor.execute(sql)
          print('\r提示：正在存入亚马逊数据,当前处理id：{}'.format(count),end='')
          count += 1
          conn.commit()
    except:
      pass 

class JDThread(threading.Thread):
  def __init__(self,keyword):
    threading.Thread.__init__(self)
    self.keyword = keyword
  def run(self):
    print('\n提示：开始爬取京东数据...')
    count = 1 

    tableName = 'db_{}_jd'.format(self.keyword) 

    try:
      print('\n提示：正在创建JD表...')
      cursor.execute('create table {} (id int,title text,prNow text,link text)'.format(tableName))
      print('\n提示：开始爬取京东页面...')
      for i in range(1,100):
        url = 'https://search.jd.com/Search?keyword={}&page={}'.format(self.keyword,i)
        soup = getSoupObject(url)
        lis = soup('li',{'class':'gl-item'})
        for li in lis:
          a = li.find_all('div',{'class':'p-name'})
          pn = li.find_all('div',{'class': 'p-price'})[0].find_all('i') 

          if not len(a) == 0:
            link = 'http:' + a[0].find_all('a')[0].attrs['href']
            title = a[0].find_all('em')[0].get_text()
          else:
            link = 'NULL'
            title = 'NULL' 

          if(len(link) > 128):
            link = 'TooLong' 

          if not len(pn) == 0:
            prNow = '￥'+ pn[0].string
          else:
            prNow = 'NULL'
          sql = "insert into {} (id,title,prNow,link) values ({},'{}','{}','{}')".format(tableName,count,title,prNow,link)
          cursor.execute(sql)
          print('\r提示：正在存入京东网数据,当前处理id：{}'.format(count),end='')
          count += 1
          conn.commit()
    except :
      pass
def closeDB():
  global conn,cursor
  conn.close()
  cursor.close() 

def main():
  print('提示：使用本程序，请手动创建空数据库：Book，并修改本程序开头的数据库连接语句')
  keyword = input("\n提示：请输入要爬取的关键字：") 

  dangdangThread = DangDangThread(keyword)
  amazonThread = AmazonThread(keyword)
  jdThread = JDThread(keyword)
   dangdangThread.start()
  amazonThread.start()
  jdThread.start()
  dangdangThread.join()
  amazonThread.join()
  jdThread.join()
   closeDB()
   print('\n爬取已经结束，即将关闭....')
  os.system('pause') 

main() 

示例截图：

关键词：Android下的部分运行结果（以导出至Excel）

总结

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