1.项目准备：网站地址：http://quanzhou.tianqi.com/
2.创建编辑Scrapy爬虫：
scrapy startproject weather
scrapy genspider HQUSpider quanzhou.tianqi.com
项目文件结构如图：
3.修改Items.py：
4.修改Spider文件HQUSpider.py：
（1）先使用命令：scrapy shell http://quanzhou.tianqi.com/ 测试和获取选择器：
（2）试验选择器：打开chrome浏览器，查看网页源代码：
（3）执行命令查看response结果：
（4）编写HQUSpider.py文件：
# -*- coding: utf-8 -*-
import scrapy
from weather.items import WeatherItem
class HquspiderSpider(scrapy.Spider):
name = 'HQUSpider'
allowed_domains = ['tianqi.com']
citys=['quanzhou','datong']
start_urls = []
for city in citys:
start_urls.append('http://'+city+'.tianqi.com/')
def parse(self, response):
subSelector=response.xpath('//div[@class="tqshow1"]')
items=[]
for sub in subSelector:
item=WeatherItem()
cityDates=''
for cityDate in sub.xpath('./h3//text()').extract():
cityDates+=cityDate
item['cityDate']=cityDates
item['week']=sub.xpath('./p//text()').extract()[0]
item['img']=sub.xpath('./ul/li[1]/img/@src').extract()[0]
temps=''
for temp in sub.xpath('./ul/li[2]//text()').extract():
temps+=temp
item['temperature']=temps
item['weather']=sub.xpath('./ul/li[3]//text()').extract()[0]
item['wind']=sub.xpath('./ul/li[4]//text()').extract()[0]
items.append(item)
return items
(5)修改pipelines.py我，处理Spider的结果：
# -*- coding: utf-8 -*-
# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: http://doc.scrapy.org/en/latest/topics/item-pipeline.html
import time
import os.path
import urllib2
import sys
reload(sys)
sys.setdefaultencoding('utf8')
class WeatherPipeline(object):
def process_item(self, item, spider):
today=time.strftime('%Y%m%d',time.localtime())
fileName=today+'.txt'
with open(fileName,'a') as fp:
fp.write(item['cityDate'].encode('utf-8')+' ')
fp.write(item['week'].encode('utf-8')+' ')
imgName=os.path.basename(item['img'])
fp.write(imgName+' ')
if os.path.exists(imgName):
pass
else:
with open(imgName,'wb') as fp:
response=urllib2.urlopen(item['img'])
fp.write(response.read())
fp.write(item['temperature'].encode('utf-8')+' ')
fp.write(item['weather'].encode('utf-8')+' ')
fp.write(item['wind'].encode('utf-8')+' ')
time.sleep(1)
return item
（6）修改settings.py文件，决定由哪个文件来处理获取的数据：
（7）执行命令：scrapy crawl HQUSpider
到此为止，一个完整的Scrapy爬虫就完成了。