scrapy加载cookies登陆

import scrapy
from xxxx.items import XXXXItem
from scrapy.http.request import Request

class ZndsSpider(scrapy.spiders.Spider):
    name = "xxxx"
    allowed_domains = ["xxxx.com"]
    start_urls=[]

    cookie={'xxx':'xxx','xxx':'xxx'}

    def start_requests(self):
        for url in self.start_urls:
　　　　　　　#加载cookies，指定回调函数，返回response
            yield Request(url,cookies=self.cookie,callback=self.parse_url)

　　def parse_url(self,response):
        body = scrapy.Selector(response)
        for sel in body.xpath('xxx'):
　　　　　　　item=XXXXItem()
            item['XX']=sel.xpath('td[1]/text()').extract()
            item['XX']=sel.xpath('td[3]/span/a/u/text()').extract()
            item['XX']=sel.xpath('td[5]/a/text()').extract()
            yield item