python爬虫入门-Scrapy基本使用

源码：链接：http://pan.baidu.com/s/1dEK82hb 密码：9flo

创建项目                                 scrapy startproject tutorial

爬取                                         scrapy crawl dmoz

爬取并保存为json格式           scrapy crawl dmoz -o items.json -t json

scrapy shell "网址/资源"

载入之后将能得到response的回应

response.body

response.headers

>>>response.xpath(‘//title‘)

>>>response.xpath(‘//title/text()‘).extract()

编辑Item：

# -*- coding: utf-8 -*-

# Define here the models for your scraped items
#
# See documentation in:
# http://doc.scrapy.org/en/latest/topics/items.html

import scrapy


class DmozItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    title = scrapy.Field()
    link = scrapy.Field()
    desc = scrapy.Field()

编辑蜘蛛:

爬取并保存为json格式

至此，根目录下会多出一个json文件

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