我对Scrapy非常陌生,而且之前我没有使用过正则表达式
以下是我的spider.py代码
class ExampleSpider(BaseSpider):
name = "test_code
allowed_domains = ["www.example.com"]
start_urls = [
"http://www.example.com/bookstore/new/1?filter=bookstore",
"http://www.example.com/bookstore/new/2?filter=bookstore",
"http://www.example.com/bookstore/new/3?filter=bookstore",
]
def parse(self, response):
hxs = HtmlXPathSelector(response)
现在,如果我们看一下start_urls,则所有三个url都相同,除了它们的整数值2？,3？不同.依此类推,我的意思是根据网站上显示的URL不受限制,我现在可以使用crawlspider并为URL构造正则表达式,如下所示,
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
import re
class ExampleSpider(CrawlSpider):
name = 'example.com'
allowed_domains = ['example.com']
start_urls = [
"http://www.example.com/bookstore/new/1?filter=bookstore",
"http://www.example.com/bookstore/new/2?filter=bookstore",
"http://www.example.com/bookstore/new/3?filter=bookstore",
]
rules = (
Rule(SgmlLinkExtractor(allow=(........),))),
)
def parse(self, response):
hxs = HtmlXPathSelector(response)
您能否指导我,如何为上述start_url列表构建抓取蜘蛛规则.
