爬取豆瓣电影信息

 爬取豆瓣电影top250movie.douban.com/top250的电影数据，并保存在MongoDB中。

创建项目
scrapy startproject douban

items.py

import scrapy


class DoubanItem(scrapy.Item):
    # define the fields for your item here like:
    # 标题
    title = scrapy.Field()
    # 信息
    bd = scrapy.Field()
    # 评分
    star = scrapy.Field()
    # 简介
    quote = scrapy.Field()

创建CrawSpider，使用模版craw

scrapy genspider -t craw doubanmovie douban.com

import scrapy
from douban.items import DoubanItem

class DoubamovieSpider(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:
            # 标题
            item['title'] = each.xpath(".//span[@class='title'][1]/text()").extract()[0]
            # 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)

 pipelines.py

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.sheet = mydb[sheetname]

    def process_item(self, item, spider):
        data = dict(item)
        self.sheet.insert(data)
        return item

settings.py

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;"

DOWNLOAD_DELAY = 2.5

# Disable cookies (enabled by default)
COOKIES_ENABLED = False

DOWNLOADER_MIDDLEWARES = {
    'douban.middlewares.RandomUserAgent': 100,
    'douban.middlewares.RandomProxy': 200,

USER_AGENTS = [
    'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)',
    'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)',
    'Opera/9.27 (Windows NT 5.2; U; zh-cn)',
    'Opera/8.0 (Macintosh; PPC Mac OS X; U; en)',
    'Mozilla/5.0 (Macintosh; PPC Mac OS X; U; en) Opera 8.0',
    'Mozilla/5.0 (Linux; U; Android 4.0.3; zh-cn; M032 Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30',
    'Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13'
]

PROXIES = [
        {"ip_port" :"121.42.140.113:16816", "user_passwd" : "用户名:密码"},
        #{"ip_prot" :"121.42.140.113:16816", "user_passwd" : ""}
        #{"ip_prot" :"121.42.140.113:16816", "user_passwd" : ""}
        #{"ip_prot" :"121.42.140.113:16816", "user_passwd" : ""}
]

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"