1.爬取豆瓣top 250电影名字、演员列表、评分和简介

2.设置随机UserAgent和Proxy

3.爬取到的数据保存到MongoDB数据库

# -*- coding: utf-8 -*-

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()

# -*- coding: utf-8 -*-

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)

# -*- 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.sheet = mydb[sheetname]

    def process_item(self, item, spider):

        data = dict(item)

        self.sheet.insert(data)

        return item

DOWNLOAD_DELAY = 2.5

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" : "****"},

        #{"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"

#!/usr/bin/env python

# -*- coding:utf-8 -*-

import random

import base64

from settings import USER_AGENTS

from settings import PROXIES

# 随机的User-Agent

class RandomUserAgent(object):

    def process_request(self, request, spider):

        useragent = random.choice(USER_AGENTS)

        #print useragent

        request.headers.setdefault("User-Agent", useragent)

class RandomProxy(object):

    def process_request(self, request, spider):

        proxy = random.choice(PROXIES)

        if proxy['user_passwd'] is None:

            # 没有代理账户验证的代理使用方式

            request.meta['proxy'] = "http://" + proxy['ip_port']

        else:

            # 对账户密码进行base64编码转换

            base64_userpasswd = base64.b64encode(proxy['user_passwd'])

            # 对应到代理服务器的信令格式里

            request.headers['Proxy-Authorization'] = 'Basic ' + base64_userpasswd

            request.meta['proxy'] = "http://" + proxy['ip_port']