Python爬虫框架Scrapy实例（三）数据存储到MongoDB
任务目标：爬取豆瓣电影top250，将数据存储到MongoDB中。

items.py文件
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# -*- coding: utf-8 -*-
import scrapy

class DoubanItem(scrapy.Item):
# define the fields for your item here like:
# 电影名
title = scrapy.Field()
# 基本信息
bd = scrapy.Field()
# 评分
star = scrapy.Field()
# 简介
quote = scrapy.Field()
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spiders文件
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# -*- coding: utf-8 -*-
import scrapy
from douban.items import DoubanItem

class DoubanmovieSpider(scrapy.Spider):
name = "doubanmovie"
allowed_domains = ["movie.douban.com"]
offset = 0
url = "https://movie.douban.com/top250?start="
start_urls = (
url + str(offset),
)

def parse(self, response):
item = DoubanItem()
movies = response.xpath('//div[@class="info"]')
for each in movies:
# 电影名
item['title'] = each.xpath('.//span[@class="title"][1]/text()').extract()[0]
# 基本信息
item['bd'] = each.xpath('.//div[@class="bd"]/p/text()').extract()[0]
# 评分
item['star'] = each.xpath('.//div[@class="star"]/span[@class="rating_num"]/text()').extract()[0]
# 简介
quote = each.xpath('.//p[@class="quote"]/span/text()').extract()
if len(quote) != 0:
item['quote'] = quote[0]
yield item

if self.offset < 225:
self.offset += 25
yield scrapy.Request(self.url + str(self.offset), callback=self.parse)
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pipelines.py文件
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# -*- coding: utf-8 -*-
import pymongo
from scrapy.conf import settings

class DoubanPipeline(object):
def __init__(self):
host = settings["MONGODB_HOST"]
port = settings["MONGODB_PORT"]
dbname = settings["MONGODB_DBNAME"]
sheetname = settings["MONGODB_SHEETNAME"]
# 创建MONGODB数据库链接
client = pymongo.MongoClient(host=host, port=port)
# 指定数据库
mydb = client[dbname]
# 存放数据的数据库表名
self.post = mydb[sheetname]

def process_item(self, item, spider):
data = dict(item)
self.post.insert(data)
return item
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settings.py文件
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# -*- coding: utf-8 -*-
BOT_NAME = 'douban'

SPIDER_MODULES = ['douban.spiders']
NEWSPIDER_MODULE = 'douban.spiders'

# Crawl responsibly by identifying yourself (and your website) on the user-agent
USER_AGENT = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0;"

ITEM_PIPELINES = {
'douban.pipelines.DoubanPipeline': 300,
}

# MONGODB 主机名
MONGODB_HOST = "127.0.0.1"
# MONGODB 端口号
MONGODB_PORT = 27017
# 数据库名称
MONGODB_DBNAME = "Douban"
# 存放数据的表名称
MONGODB_SHEETNAME = "doubanmovies"