为什么我的scrapy没有抓到任何东西？

Question

这是我的蜘蛛。在我执行了蜘蛛之后，什么也没有出现。我不知道为什么它是空白的。我觉得问题在于收益和回报，但我不知道如何改变它。

import scrapy
from scrapy.http import Request
from scrapy import Selector
from CSDNBlog1.items import Csdnblog1Item

class CSDNBlogSpider(scrapy.Spider):
    name='CSDNBlog1'
    download_delay=1
    allowed_domains=['blog.csdn.net']
    starts_urls=['http://blog.csdn.net/u012150179/article/details/117490171']

    def parse(self,response):
        sel=Selector(response)
        items=[]
        item=Csdnblog1Item()
        aricle_url=str(response.url)
        article_name=sel.xpath('//div[@id="article_details"]/div/h1/span/a/text()').extract()

        item['article_name']=[n.encode('utf-8') for n in article_name]
        item['article_url']=article_url.encode('utf-8')
        yield item


        urls=sel.xpath('//li[@class="next_article"]/a/@href').extract()
        for url in urls:
            print(url)
            url="http://blog.csdn.net"+url
            print(url)
            yield Request(url,callback=self.parse)

这是我的蜘蛛情况，它什么也没做。

2017-02-06 15:35:46 [scrapy] INFO: Spider opened
2017-02-06 15:35:46 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped     0 

Answer 1

您的start_url不再工作，并且yield语句处于错误的位置。请尝试使用以下代码：

import scrapy
from CSDNBlog1.items import Csdnblog1Item
from scrapy import Selector

class Csdnblog1Spider(scrapy.Spider):
    name = "CSDNBlog2"
    download_delay=1
    allowed_domains = ["http://blog.csdn.net/"]
    start_urls = ['http://blog.csdn.net/u012150179/article/details/37306629/']

    def parse(self, response):
        item=Csdnblog1Item()
        sel=Selector(response)
        item['project'] = self.settings.get('BOT_NAME')

        article_url=str(response.url)
        article_name=sel.xpath('//div[@id="article_details"]/div/h1/span/a/text()').extract()

        item['article_name']=[n.encode('utf-8') for n in article_name]
        item['article_url']=article_url.encode('utf-8')

        urls=sel.xpath('//li[@class="next_article"]/a/@href').extract()
        for url in urls:
            print(url)
            url="http://blog.csdn.net"+url
            print(url)
        yield scrapy.Request(url,callback=self.parse)

    return item

Answer 2

In [1]: fetch('http://blog.csdn.net/u012150179/article/details/117490171')
2017-02-06 16:41:51 [scrapy.downloadermiddlewares.redirect] DEBUG: Redirecting (302) to <GET http://blog.csdn.net/error/404.html?from=http%3a%2f%2fblog.csdn.net%2fu012150179%2farticle%2fdetails%2f117490171> from <GET http://blog.csdn.net/u012150179/article/details/117490171>
2017-02-06 16:41:51 [scrapy.core.engine] DEBUG: Crawled (404) <GET http://blog.csdn.net/error/404.html?from=http%3a%2f%2fblog.csdn.net%2fu012150179%2farticle%2fdetails%2f117490171> (referer: None)

确保你得到了正确的start_url