Scrapy怎样同时运行多个爬虫？

今天药忘吃喽~ 2023-10-11 13:39 56阅读 0赞

默认情况下，当你运行 scrapy crawl 命令的时候，scrapy只能在单个进程里面运行一个爬虫。然后Scrapy运行方式除了采用命令行式的运行方式以外还可以使用API的方式来运行爬虫，而采用API的方式运行的爬虫是支持运行多个爬虫的。

下面的案例是运行多个爬虫：

import scrapy
    from scrapy.crawler import CrawlerProcess
    
    class MySpider1(scrapy.Spider):
        # Your first spider definition
        ...
    
    class MySpider2(scrapy.Spider):
        # Your second spider definition
        ...
    
    process = CrawlerProcess() # 初始化事件循环
    process.crawl(MySpider1) # 将爬虫类方式事件循环
    process.crawl(MySpider2) # 将爬虫类方式事件循环
    process.start() # the script will block here until all crawling jobs are finished

此外采用 CrawlerRunner 也是可行的：

import scrapy
    from twisted.internet import reactor
    from scrapy.crawler import CrawlerRunner
    from scrapy.utils.log import configure_logging
    
    class MySpider1(scrapy.Spider):
        # Your first spider definition
        ...
    
    class MySpider2(scrapy.Spider):
        # Your second spider definition
        ...
    
    configure_logging()
    runner = CrawlerRunner()
    runner.crawl(MySpider1)
    runner.crawl(MySpider2)
    d = runner.join()
    d.addBoth(lambda _: reactor.stop())
    
    reactor.run() # the script will block here until all crawling jobs are finished

deferreds的方式来运行：

from twisted.internet import reactor, defer
    from scrapy.crawler import CrawlerRunner
    from scrapy.utils.log import configure_logging
    
    class MySpider1(scrapy.Spider):
        # Your first spider definition
        ...
    
    class MySpider2(scrapy.Spider):
        # Your second spider definition
        ...
    
    configure_logging()
    runner = CrawlerRunner()
    
    @defer.inlineCallbacks
    def crawl():
        yield runner.crawl(MySpider1)
        yield runner.crawl(MySpider2)
        reactor.stop()
    
    crawl()
    reactor.run() # the script will block here until the last crawl call is finished

更多细节参考：

[Scrapy文档][Scrapy]

转载于:https://www.cnblogs.com/renshaoqi/p/11177166.html

[Scrapy]: https://scrapy-chs.readthedocs.io/zh_CN/1.0/intro/overview.html