scrapy spider的几种爬取方式实例代码


            本节课介绍了scrapy的爬虫框架，重点说了scrapy组件spider。

spider的几种爬取方式：



  爬取1页内容

  按照给定列表拼出链接爬取多页

  找到‘下一页'标签进行爬取

  进入链接，按照链接进行爬取 

  



下面分别给出了示例

1.爬取1页内容





#by 寒小阳(hanxiaoyang.ml@gmail.com)



import scrapy





class JulyeduSpider(scrapy.Spider):

  name = "julyedu"

  start_urls = [

    'http://www.julyedu.com/category/index',

  ]



  def parse(self, response):

    for julyedu_class in response.xpath('//div[@class="course_info_box"]'):

      print julyedu_class.xpath('a/h4/text()').extract_first()

      print julyedu_class.xpath('a/p[@class="course-info-tip"][1]/text()').extract_first()

      print julyedu_class.xpath('a/p[@class="course-info-tip"][2]/text()').extract_first()

      print response.urljoin(julyedu_class.xpath('a/img[1]/@src').extract_first())

      print "\n"



      yield {

        'title':julyedu_class.xpath('a/h4/text()').extract_first(),

        'desc': julyedu_class.xpath('a/p[@class="course-info-tip"][1]/text()').extract_first(),

        'time': julyedu_class.xpath('a/p[@class="course-info-tip"][2]/text()').extract_first(),

        'img_url': response.urljoin(julyedu_class.xpath('a/img[1]/@src').extract_first())

      }





2.按照给定列表拼出链接爬取多页





#by 寒小阳(hanxiaoyang.ml@gmail.com)



import scrapy





class CnBlogSpider(scrapy.Spider):

  name = "cnblogs"

  allowed_domains = ["cnblogs.com"]

  start_urls = [

    'http://www.cnblogs.com/pick/#p%s' % p for p in xrange(1, 11)

    ]



  def parse(self, response):

    for article in response.xpath('//div[@class="post_item"]'):

      print article.xpath('div[@class="post_item_body"]/h3/a/text()').extract_first().strip()

      print response.urljoin(article.xpath('div[@class="post_item_body"]/h3/a/@href').extract_first()).strip()

      print article.xpath('div[@class="post_item_body"]/p/text()').extract_first().strip()

      print article.xpath('div[@class="post_item_body"]/div[@class="post_item_foot"]/a/text()').extract_first().strip()

      print response.urljoin(article.xpath('div[@class="post_item_body"]/div/a/@href').extract_first()).strip()

      print article.xpath('div[@class="post_item_body"]/div[@class="post_item_foot"]/span[@class="article_comment"]/a/text()').extract_first().strip()

      print article.xpath('div[@class="post_item_body"]/div[@class="post_item_foot"]/span[@class="article_view"]/a/text()').extract_first().strip()

      print ""



      yield {

        'title': article.xpath('div[@class="post_item_body"]/h3/a/text()').extract_first().strip(),

        'link': response.urljoin(article.xpath('div[@class="post_item_body"]/h3/a/@href').extract_first()).strip(),

        'summary': article.xpath('div[@class="post_item_body"]/p/text()').extract_first().strip(),

        'author': article.xpath('div[@class="post_item_body"]/div[@class="post_item_foot"]/a/text()').extract_first().strip(),

        'author_link': response.urljoin(article.xpath('div[@class="post_item_body"]/div/a/@href').extract_first()).strip(),

        'comment': article.xpath('div[@class="post_item_body"]/div[@class="post_item_foot"]/span[@class="article_comment"]/a/text()').extract_first().strip(),

        'view': article.xpath('div[@class="post_item_body"]/div[@class="post_item_foot"]/span[@class="article_view"]/a/text()').extract_first().strip(),

      }



3.找到‘下一页'标签进行爬取





import scrapy

class QuotesSpider(scrapy.Spider):

  name = "quotes"

  start_urls = [

    'http://quotes.toscrape.com/tag/humor/',

  ]



  def parse(self, response):

    for quote in response.xpath('//div[@class="quote"]'):

      yield {

        'text': quote.xpath('span[@class="text"]/text()').extract_first(),

        'author': quote.xpath('span/small[@class="author"]/text()').extract_first(),

      }



    next_page = response.xpath('//li[@class="next"]/@herf').extract_first()

    if next_page is not None:

      next_page = response.urljoin(next_page)

      yield scrapy.Request(next_page, callback=self.parse)



4.进入链接，按照链接进行爬取





#by 寒小阳(hanxiaoyang.ml@gmail.com)



import scrapy





class QQNewsSpider(scrapy.Spider):

  name = 'qqnews'

  start_urls = ['http://news.qq.com/society_index.shtml']



  def parse(self, response):

    for href in response.xpath('//*[@id="news"]/div/div/div/div/em/a/@href'):

      full_url = response.urljoin(href.extract())

      yield scrapy.Request(full_url, callback=self.parse_question)



  def parse_question(self, response):

    print response.xpath('//div[@class="qq_article"]/div/h1/text()').extract_first()

    print response.xpath('//span[@class="a_time"]/text()').extract_first()

    print response.xpath('//span[@class="a_catalog"]/a/text()').extract_first()

    print "\n".join(response.xpath('//div[@id="Cnt-Main-Article-QQ"]/p[@class="text"]/text()').extract())

    print ""

    yield {

      'title': response.xpath('//div[@class="qq_article"]/div/h1/text()').extract_first(),

      'content': "\n".join(response.xpath('//div[@id="Cnt-Main-Article-QQ"]/p[@class="text"]/text()').extract()),

      'time': response.xpath('//span[@class="a_time"]/text()').extract_first(),

      'cate': response.xpath('//span[@class="a_catalog"]/a/text()').extract_first(),

    }



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