scrapy startproject qsbk   #创建项目

scrapy genspider qsbk_spider "qiushibaike.com"   #创建爬虫

scrapy crawl qsbk_spider         #运行爬虫

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

import scrapy

from qsbk.items import QsbkItem

class QsbkSpiderSpider(scrapy.Spider):

    name = 'qsbk_spider'

    allowed_domains = ['qiushibaike.com']

    start_urls = ['https://www.qiushibaike.com/8hr/page/1/']

    base_domain = "https://www.qiushibaike.com"

    def parse(self, response):

        duanzidivs = response.xpath("//div[@id='content-left']/div")

        for duanzidiv in duanzidivs:

            author = duanzidiv.xpath(".//h2/text()").get().strip()

            content = duanzidiv.xpath(".//div[@class='content']//text()").getall()

            content = "".join(content).strip()

            item = QsbkItem(author=author,content=content)

            yield item

        #爬后面页的数据

        next_url = response.xpath("//ul[@class='pagination']/li[last()]/a/@href").get()

        if not next_url:

            return

        else:

            yield scrapy.Request(self.base_domain+next_url,callback=self.parse)

import scrapy

class QsbkItem(scrapy.Item):

    author = scrapy.Field()

    content = scrapy.Field()

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

import json

#1.手动把dick转换成json格式

# class QsbkPipeline(object):

#     def __init__(self):

#         self.fp = open('duanzi.json','w',encoding='utf-8')

#

#     def open_spider(self,spider):

#         print('开始爬虫')

#

#     def process_item(self, item, spider):

#         item_json = json.dumps(dict(item),ensure_ascii=False)

#         self.fp.write(item_json+'\n')

#         return item

#

#     def close_spider(self,spider):

#         self.fp.close()

#         print('爬虫结束了')

#2.适用JsonItemExporter，使用与数据量小的情况下

# from scrapy.exporters import JsonItemExporter

# class QsbkPipeline(object):

#     def __init__(self):

#         self.fp = open('duanzi.json','wb')

#         self.exporter = JsonItemExporter(self.fp,ensure_ascii=False,encoding='utf-8')

#         self.exporter.start_exporting()

#

#     def open_spider(self,spider):

#         print('开始爬虫')

#

#     def process_item(self, item, spider):

#         self.exporter.export_item(item)

#         return item

#

#     def close_spider(self,spider):

#         self.exporter.finish_exporting()

#         self.fp.close()

#         print('爬虫结束了')

#3.JsonLinesItemExporter，适用与数据量大的情况下

from scrapy.exporters import JsonLinesItemExporter

class QsbkPipeline(object):

    def __init__(self):

        self.fp = open('duanzi.json','wb')

        self.exporter = JsonLinesItemExporter(self.fp,ensure_ascii=False,encoding='utf-8')

    def open_spider(self,spider):

        print('开始爬虫')

    def process_item(self, item, spider):

        self.exporter.export_item(item)

        return item

    def close_spider(self,spider):

        self.fp.close()

        print('爬虫结束了')

ROBOTSTXT_OBEY = False

DOWNLOAD_DELAY = 1

DEFAULT_REQUEST_HEADERS = {

  'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',

  # 'Accept-Language': 'en',

    'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36',

}

ITEM_PIPELINES = {
   'qsbk.pipelines.QsbkPipeline': 300,
}

from scrapy import cmdline

cmdline.execute("scrapy crawl qsbk_spider".split())