分布式爬虫

1. 爬去首页

 1 # -*- coding: utf-8 -*-
 2 from scrapy_redis.spiders import RedisCrawlSpider
 3 import scrapy
 4 import redis
 5 
 6 class DemoSpider(RedisCrawlSpider):
 7     name = 'demo'
 8     allowed_domains = ['demo.com']
 9     redis_key = 'demo:start_urls'
10     redis_info=redis.Redis(host='111.111.111.111', port=6379)
11 
12     def parse(self, response):
13         sel = scrapy.Selector(response)
14         a_list = sel.xpath('//div[@id="search_right_demo"]/div/div[@class="clearfixed"]/a')
15         for a_item in a_list:
16             url = self.host_urls + a_item.xpath('@href').extract()[0]
17             url = url[:url.find('=') + 1] + '489' + url[url.find('&'):]
18             self.redis_info.lpush('demo:list_urls',url)

2. 爬去URL列表

# -*- coding: utf-8 -*-
from scrapy_redis.spiders import RedisCrawlSpiderimport scrapy
import redis

class DemoListSpider(RedisCrawlSpider):
    name = 'demo_list'
    allowed_domains = ['demo.com']
    redis_key = 'demo:list_urls'
    redis_info=redis.Redis(host='111.111.111.111', port=6379)
    def parse(self, response):
        selector = scrapy.Selector(response)
        table_a_xpath = selector.xpath('//*[@id="newlist_list_content_table"]/table/tr[1]/td[1]/div/a/@href').extract()
        for url in table_a_xpath:
            self.redis_info.lpush('demo:info_urls', url)
        next_page = selector.xpath('//a[@class="next-page"]/@href').extract()
        if next_page:
            self.redis_info.lpush('demo:list_urls', next_page[0])

3. 爬去商品详细信息

# -*- coding: utf-8 -*-
from scrapy_redis.spiders import RedisCrawlSpider
from demo.items import demoItem
import scrapy
import redis
class demoInfoSpider(RedisCrawlSpider):
    name = 'demo_info'
    allowed_domains = ['zhaopin.com']
    redis_key = 'demo:info_urls'
    redis_info=redis.Redis(host='111.111.111.111', port=6379)
    def parse(self, response):
        sel = scrapy.Selector(response)
        zwmc = sel.xpath('//div[@class="top-fixed-box"]/div[@class="fixed-inner-box"]/div[1]/h1/text()').extract()
        gsmc = sel.xpath('//div[@class="top-fixed-box"]/div[@class="fixed-inner-box"]/div[1]/h2/a/text()').extract()
        flxx = sel.xpath('//div[@class="top-fixed-box"]/div[@class="fixed-inner-box"]/div[1]/div/span/text()').extract()
　　　　　
　　　　 yield item