scrapy爬虫框架(四)-爬取多个网页

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

    
 import scrapy
    
  
    
 from juzi.items import JuziItem
    
  
    
  
    
 class JuzispiderSpider(scrapy.Spider):
    
     name = 'juziSpider'
    
     allowed_domains = ['www.juzikong.com']
    
     start_urls = ['https://www.juzikong.com/tags/%E5%8F%A5%E5%AD%90%E8%BF%B7?page=1']
    
     base_domain = "https://www.juzikong.com"
    
  
    
     def parse(self, response):
    
  
    
     juzis = response.xpath('//div[@class="list_1fuFI"]//section')
    
     print (juzis)
    
     print("*" * 50)
    
     for juzi in juzis:
    
         content = juzi.xpath('.//a//span//span//span//text()').getall()
    
         author = juzi.xpath(".//div/span/span/span/span/text()").get()
    
         content="".join(content)#列表转化为字符串
    
         if not author:
    
             author="匿名"
    
         print(author,":",content)
    
         item = JuziItem(author=author,content=content)
    
         yield item
    
     print("*" * 50,)
    
     next_url = response.xpath("//button[@class='btn-next']//a/@href").get()
    
     if not next_url:
    
         return
    
     else:
    
         yield scrapy.Request(self.base_domain+next_url,callback=self.parse)

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

    
  
    
 # Scrapy settings for juzi project
    
 #
    
 # For simplicity, this file contains only settings considered important or
    
 # commonly used. You can find more settings consulting the documentation:
    
 #
    
 #     https://docs.scrapy.org/en/latest/topics/settings.html
    
 #     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
    
 #     https://docs.scrapy.org/en/latest/topics/spider-middleware.html
    
  
    
 BOT_NAME = 'juzi'
    
  
    
 SPIDER_MODULES = ['juzi.spiders']
    
 NEWSPIDER_MODULE = 'juzi.spiders'
    
  
    
  
    
 # Crawl responsibly by identifying yourself (and your website) on the user-agent
    
 #USER_AGENT = 'juzi (+http://www.yourdomain.com)'
    
  
    
 # Obey robots.txt rules
    
 ROBOTSTXT_OBEY = False
    
  
    
 # Configure maximum concurrent requests performed by Scrapy (default: 16)
    
 #CONCURRENT_REQUESTS = 32
    
  
    
 # Configure a delay for requests for the same website (default: 0)
    
 # See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
    
 # See also autothrottle settings and docs
    
 DOWNLOAD_DELAY = 1
    
 # The download delay setting will honor only one of:
    
 #CONCURRENT_REQUESTS_PER_DOMAIN = 16
    
 #CONCURRENT_REQUESTS_PER_IP = 16
    
  
    
 # Disable cookies (enabled by default)
    
 #COOKIES_ENABLED = False
    
  
    
 # Disable Telnet Console (enabled by default)
    
 #TELNETCONSOLE_ENABLED = False
    
  
    
 # Override the default request headers:
    
 #DEFAULT_REQUEST_HEADERS = {
    
 #   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
    
 #   'Accept-Language': 'en',
    
 #}
    
 # Override the default request headers:
    
 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 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36'
    
 }
    
  
    
 # Enable or disable spider middlewares
    
 # See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
    
 #SPIDER_MIDDLEWARES = {
    
 #    'juzi.middlewares.JuziSpiderMiddleware': 543,
    
 #}
    
  
    
 # Enable or disable downloader middlewares
    
 # See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
    
 #DOWNLOADER_MIDDLEWARES = {
    
 #    'juzi.middlewares.JuziDownloaderMiddleware': 543,
    
 #}
    
  
    
 # Enable or disable extensions
    
 # See https://docs.scrapy.org/en/latest/topics/extensions.html
    
 #EXTENSIONS = {
    
 #    'scrapy.extensions.telnet.TelnetConsole': None,
    
 #}
    
  
    
 # Configure item pipelines
    
 # See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
    
 ITEM_PIPELINES = {
    
    'juzi.pipelines.JuziPipeline': 300,
    
 }
    
  
    
 # Enable and configure the AutoThrottle extension (disabled by default)
    
 # See https://docs.scrapy.org/en/latest/topics/autothrottle.html
    
 #AUTOTHROTTLE_ENABLED = True
    
 # The initial download delay
    
 #AUTOTHROTTLE_START_DELAY = 5
    
 # The maximum download delay to be set in case of high latencies
    
 #AUTOTHROTTLE_MAX_DELAY = 60
    
 # The average number of requests Scrapy should be sending in parallel to
    
 # each remote server
    
 #AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
    
 # Enable showing throttling stats for every response received:
    
 #AUTOTHROTTLE_DEBUG = False
    
  
    
 # Enable and configure HTTP caching (disabled by default)
    
 # See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
    
 #HTTPCACHE_ENABLED = True
    
 #HTTPCACHE_EXPIRATION_SECS = 0
    
 #HTTPCACHE_DIR = 'httpcache'
    
 #HTTPCACHE_IGNORE_HTTP_CODES = []
    
 #HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'

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

    
  
    
 # Define your item pipelines here
    
 #
    
 # Don't forget to add your pipeline to the ITEM_PIPELINES setting
    
 # See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
    
  
    
 from scrapy.exporters import JsonLinesItemExporter
    
  
    
 class JuziPipeline(object):
    
     def __init__(self):  # 初始化方法
    
     # 使用二进制来写入，因此“w”-->"wb"
    
     self.fp = open("juzi.json", "wb")
    
     self.exporter = JsonLinesItemExporter(self.fp, ensure_ascii=False, encoding='utf-8')
    
     # self.exporter.start_exporting()
    
  
    
     def process_item(self, item, spider):
    
     self.exporter.export_item(item)
    
     return item
    
  
    
     def open_spider(self, spider):
    
     print("爬虫开始了！")
    
  
    
     def close_spider(self, spider):
    
     # self.exporter.finish_exporting()
    
     self.fp.close()
    
     print("爬虫结束了！")