在以上兩篇文章中已經(jīng)介紹到了 Python 爬蟲和 MongoDB ， 那么下面我就將爬蟲爬下來(lái)的數(shù)據(jù)存到 MongoDB 中去，首先來(lái)介紹一下我們將要爬取的網(wǎng)站, readfree 網(wǎng)站，這個(gè)網(wǎng)站非常的好，我們只需要每天簽到就可以免費(fèi)下載三本書，良心網(wǎng)站，下面我就將該網(wǎng)站上的每日推薦書籍爬下來(lái)。

利用上面幾篇文章介紹的方法，我們很容易的就可以在網(wǎng)頁(yè)的源代碼中尋找到書籍的姓名和書籍作者的信息。

找到之后我們復(fù)制 XPath ，然后進(jìn)行提取即可。源代碼如下所示

# coding=utf-8

import re
import requests
from lxml import etree
import pymongo
import sys

reload(sys)
sys.setdefaultencoding('utf-8')

def getpages(url, total):
  nowpage = int(re.search('(d+)', url, re.S).group(1))
  urls = []

  for i in range(nowpage, total + 1):
    link = re.sub('(d+)', '%s' % i, url, re.S)
    urls.append(link)

  return urls

def spider(url):
  html = requests.get(url)

  selector = etree.HTML(html.text)

  book_name = selector.xpath('//*[@id="container"]/ul/li//div/div[2]/a/text()')
  book_author = selector.xpath('//*[@id="container"]/ul/li//div/div[2]/div/a/text()')

  saveinfo(book_name, book_author)

def saveinfo(book_name, book_author):
  connection = pymongo.MongoClient()
  BookDB = connection.BookDB
  BookTable = BookDB.books

  length = len(book_name)

  for i in range(0, length):
    books = {}
    books['name'] = str(book_name[i]).replace('n','')
    books['author'] = str(book_author[i]).replace('n','')
    BookTable.insert_one(books)

if __name__ == '__main__':
  url = 'http://readfree.me/shuffle/?page=1'
  urls = getpages(url,3)

  for each in urls:
    spider(each)