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spider和python的关系_Scrapy框架-Spider和CrawlSpider的区别

贾骏喆
2023-12-01

1.目标

爬取每个页面链接的内部内容和投诉信息

2.方法1:通过spider爬取

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

import scrapy

from dongguanspider.items import dongguanitem

class sunspider(scrapy.spider):

name = 'sun'

allowed_domains = ['wz.sun0769.com']

url = 'http://wz.sun0769.com/index.php/question/questiontype?type=4&page='

offset = 0

start_urls = [url + str(offset)]

def parse(self, response):

# 每一页的所有帖子的链接集合

links = response.xpath('//div[@class="greyframe"]/table//td/a[@class="news14"]/@href').extract()

# 迭代取出集合里的链接

for link in links:

# 提取列表里每个帖子的链接,发送请求并调用parse——item来处理

yield scrapy.request(link, callback=self.parse_item)

# 页面终止条件成立前,会一直自增offset的值,并发送新的页面请求,调用parse方法处理

if self.offset<=71160:

self.offset +=30

yield scrapy.request(self.url + str(self.offset), callback=self.parse)

def parse_item(self, response):

item = dongguanitem()

item['title'] = response.xpath('//div[@class="wzy1"]/table[1]//tr/td[2]/span[1]/text()').extract()[0].split(':')[-1]

item['url'] = response.url

item['number'] = response.xpath('//div[@class="wzy1"]/table[1]//tr/td[2]/span[2]/text()').extract()[0].split(':')[-1]

# 是否是图片

content_pic = response.xpath('//div[@class="textpic"]/img/@src').extract()

if len(content_pic)==0:

content_no_pic = response.xpath('//div[@class="wzy1"]/table[2]//tr/td/text()').extract()[0]

item['content'] = "".join(content_no_pic).replace("\xa0", "")

else:

item['content'] = "".join(content_pic[0]).replace("\xa0", "")

yield item

3. 通过crawlspider爬取

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

import scrapy

from scrapy.linkextractors import linkextractor

from scrapy.spiders import crawlspider, rule

from dongguan.items import dongguanitem

class sunspider(crawlspider):

name = 'sun'

allowed_domains = ['wz.sun0769.com']

start_urls = ['http://wz.sun0769.com/index.php/question/questiontype?type=4&page=30']

rules = [

rule(linkextractor(allow=('type=4&page=\d+'))),

rule(linkextractor(allow = ('/html/question/\d+/\d+.shtml')), callback = 'parsedongguan')

]

def parsedongguan(self, response):

item = dongguanitem()

item['title'] = response.xpath('//div[@class="wzy1"]/table[1]//tr/td[2]/span[1]/text()').extract()[0].split(':')[-1]

item['url'] = response.url

item['number'] = response.xpath('//div[@class="wzy1"]/table[1]//tr/td[2]/span[2]/text()').extract()[0].split(':')[-1]

# 是否是图片

content_pic = response.xpath('//div[@class="textpic"]/img/@src').extract()

if len(content_pic)==0:

content_no_pic = response.xpath('//div[@class="wzy1"]/table[2]//tr/td/text()').extract()[0]

item['content'] = "".join(content_no_pic).replace("\xa0", "")

else:

item['content'] = "".join(content_pic[0]).replace("\xa0", "")

yield item

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