scrapy爬虫之断点续爬和多个spider同时爬取

from scrapy.commands import ScrapyCommand
from scrapy.utils.project import get_project_settings

#断点续爬scrapy crawl spider_name -s JOBDIR=crawls/spider_name
#运行命令scrapy crawlall
class Command(ScrapyCommand):
    requires_project = True

    def syntax(self):
        return '[options]'

    def short_desc(self):
        return 'Runs all of the spiders'

    def run(self, args, opts):
        spider_list = self.crawler_process.spiders.list()
        for name in spider_list:
            self.crawler_process.crawl(name, **opts.__dict__)
        self.crawler_process.start()

　　

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 多个spider同时运行  

新建命令文件夹commands,目录下新建crawlall.py
scrapy crawlall 需在settings里配置 COMMANDS_MODULE = 'project.commands'
执行命令scrapy crawlall
原理:通过加载用户初始化的 crawler_process.spiders 获取列表下的所有spider的name,然后遍历list 分别crawl

断点续爬

#断点续爬 scrapy crawl spider_name -s JOBDIR=crawls/spider_name
↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑
terminnal 执行此命令
可在crawls目录下记录断点，下次继续重复执行命令可从断点续爬。
详细见开发者文档
https://doc.scrapy.org/en/latest/topics/jobs.html?highlight=jobdir