scrapy 爬虫框架怎么爬去的数据怎么生成一个json文件

 scrapy crawl min_spider -o min_spider.json

说明:  我的爬虫名字为min_spider,这条命令会在当前文件夹下生成一个min_spider.json的文件

class MinSpiderSpider(scrapy.Spider):
    name = 'min_spider'
    allowed_domains = ['baidu.com']
    start_urls = ['http://www.baidu.com/']

还支持csv xml pickle marshal等格式  代码都一样

 scrapy crawl min_spider -o min_spider.csv
 scrapy crawl min_spider -o min_spider.xml
 scrapy crawl min_spider -o min_spider.pickle
 scrapy crawl min_spider -o min_spider.marshal