Scrapy:如何将爬行统计数据保存到json文件？

FEED_FORMAT = "json"
FEED_URI = "output.json"

import scrapy

class MyItem(scrapy.Item):
    field1 = scrapy.Field()
    field2 = scrapy.Field()
    # 添加其他字段...

class MySpider(scrapy.Spider):
    name = "my_spider"
    # 其他Spider配置...

    def parse(self, response):
        item = MyItem()
        item['field1'] = response.xpath("//xpath1").get()
        item['field2'] = response.xpath("//xpath2").get()
        # 提取其他字段...

        yield item

scrapy crawl my_spider -o output.json