Spider、CrawlSpider、RedisSpider代码区别_rediscrawlspider vs redisspider-优快云博客

本文介绍了三种Scrapy爬虫的实现方式：Spider类用于单一页面抓取，CrawlSpider类适用于多页面爬取并遵循一定规则，RedisSpider类则利用Redis进行任务调度，适合分布式爬虫场景。

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Spider：

class BookSpider(scrapy.Spider):
    name = 'book'
    allowed_domains = ['suning.com']
    start_urls = ['https://book.suning.com/']

    def parse(self, response):
        pass

CrawlSpider：

# -*- coding: utf-8 -*-
from scrapy.linkextractors import LinkExtractor
from scrapy.spiders import CrawlSpider, Rule


class KaoyanSpider(CrawlSpider):
    name = 'kaoyan'
    allowed_domains = ['kaoyan365.cn']
    start_urls = ['http://www.kaoyan365.cn/kaoyantiaoji/tiaojixinxi/158281.html']

    rules = (
        # 提取列表页的url地址
        Rule(LinkExtractor(allow=r'position\.php\?&start=\d*?#a'), callback='parse_list', follow=True),
        # 提取详情页的url地址
        # Rule(LinkExtractor(allow=r'position_detail\.php\?id=\d*?&keywords=&tid=0&lid=0'), callback='parse_item')
    )

    def parse_list(self, response):
        pass

RedisSpider：

class BookSpider(RedisSpider):  # 继承自父类为RedisSpider
    name = 'dang'
    allowed_domains = ['dangdang.com']  # 手动指定allow_domains
    # start_urls = ['http://dangdang.com/']  # 没有start_urls
    redis_key = "dangdang"  # 增加了一个redis_key的键

    def parse(self, response):
        pass