19 03 12 环球网 三级页面跳转加翻页 数据抓取 打印(无数据库版)

这次先没有数据库  

spider

# -*- coding: utf-8 -*-
import scrapy
# from yang_guan.items import YangGuanItem
from copy import deepcopy
from scrapy.spiders import CrawlSpider

class YgSpider(scrapy.Spider):
    name = 'yg'
    # allowed_domains = ['huanqiu.com']
    start_urls = ['http://www.huanqiu.com/',
                  ]

    def parse (self, response):  # 总页面  第一个一定要用parse  用来传递start_urls
        item = {}

        class_news_urls_li = response.xpath(".//div[@class='navCon']/ul/li/a")
        print(class_news_urls_li)
        for class_news_url in class_news_urls_li:
            item["class_tittle"] = class_news_url.xpath("./text()").extract_first()
            print(item)
            new_url = class_news_url.xpath("./@href").extract_first()
            print(new_url)
            yield scrapy.Request(
                new_url,
                callback=self.second_class,
                meta={"item": deepcopy(item)},  # 由于是多线程 所以要用深拷贝进入item
            )

    def second_class(self, response):  # 二级页面
        item = response.meta["item"]
        print(response.url)

        second_urls = response.xpath(".//div/h2/em")

        for second_url in second_urls:

            secoond_news_url = second_url.xpath("./a/@href").extract_first()

            yield scrapy.Request(
                secoond_news_url,
                callback=self.parse_detail_analyze,
                meta={"item": deepcopy(item)}
            )

    def parse_detail_analyze(self, response):  # 进入第三成  总细节的抓取  http://china.huanqiu.com/leaders/'
        item = response.meta["item"]

        li_list = response.xpath("//ul[@class='listPicBox']/li")

        for li in li_list:
            # item = YangGuanItem()
            item["title"] = li.xpath("./h3/a/text()").extract_first()
            item["img_url"] = li.xpath("./a/img/@src").extract_first()
            item["detail"] = li.xpath("./h5/text()").extract_first()
            yield item

        next_url = response.xpath(".//div[@class='pageBox']/div/a[last()]/@href").extract_first()  # 遇见翻页就要这样写

        yield scrapy.Request(next_url, callback=self.parse_detail_analyze,meta={"item":response.meta["item"]})

关于setting

# -*- coding: utf-8 -*-
import scrapy
# from yang_guan.items import YangGuanItem
from copy import deepcopy
from scrapy.spiders import CrawlSpider

class YgSpider(scrapy.Spider):
    name = 'yg'
    # allowed_domains = ['huanqiu.com']
    start_urls = ['http://www.huanqiu.com/',
                  ]

    def parse (self, response):  # 总页面  第一个一定要用parse  用来传递start_urls
        item = {}

        class_news_urls_li = response.xpath(".//div[@class='navCon']/ul/li/a")
        print(class_news_urls_li)
        for class_news_url in class_news_urls_li:
            item["class_tittle"] = class_news_url.xpath("./text()").extract_first()
            print(item)
            new_url = class_news_url.xpath("./@href").extract_first()
            print(new_url)
            yield scrapy.Request(
                new_url,
                callback=self.second_class,
                meta={"item": deepcopy(item)},  # 由于是多线程 所以要用深拷贝进入item
            )

    def second_class(self, response):  # 二级页面
        item = response.meta["item"]
        print(response.url)

        second_urls = response.xpath(".//div/h2/em")

        for second_url in second_urls:

            secoond_news_url = second_url.xpath("./a/@href").extract_first()

            yield scrapy.Request(
                secoond_news_url,
                callback=self.parse_detail_analyze,
                meta={"item": deepcopy(item)}
            )

    def parse_detail_analyze(self, response):  # 进入第三成  总细节的抓取  http://china.huanqiu.com/leaders/'
        item = response.meta["item"]

        li_list = response.xpath("//ul[@class='listPicBox']/li")

        for li in li_list:
            # item = YangGuanItem()
            item["title"] = li.xpath("./h3/a/text()").extract_first()
            item["img_url"] = li.xpath("./a/img/@src").extract_first()
            item["detail"] = li.xpath("./h5/text()").extract_first()
            yield item

        next_url = response.xpath(".//div[@class='pageBox']/div/a[last()]/@href").extract_first()  # 遇见翻页就要这样写

        yield scrapy.Request(next_url, callback=self.parse_detail_analyze,meta={"item":response.meta["item"]})