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这篇文章主要介绍Python怎么抓取聚划算商品分析页面获取商品信息并以XML格式保存到本地，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
具体内容如下
#!/user/bin/python
# -*- coding: gbk -*-
#Spider.py
import urllib2
import httplib
import StringIO
import gzip
import re
import chardet
import sys
import os
import datetime
from xml.dom.minidom import Document
from BeautifulSoup import BeautifulSoup
## 这段代码是用于解决控制台打印汉字报错的问题
reload(sys)
sys.setdefaultencoding("utf8")
#####################################################
## debug模式开关，开启后可以看到Http请求的头部信息以及debug日志
DEBUG = 1
NO_DEBUG = 0
httplib.HTTPConnection.debuglevel = DEBUG
## 是否显示爬取网页源代码开关
showSrcCode = False
## 压缩方式
ZIP_TYPE = "gzip"
fileName = "auctions"
location = "d://spiderData/"
## header
headerConfig = {"User-Agent":"taobao-yanyuan.qzs", "Accept-encoding":ZIP_TYPE}
#####################################################
#############class SpiderConfig #####################
class SpiderConfig:
"""
configuration for spider name and url
"""
def __init__(self, name, url):
self.name = name
self.url = url
#####################################################
##############class SpiderAuctionDomain##############
class SpiderAuctionDomain:
"""
Store information with auctions spidered by python
"""
title = ""
url = ""
img = ""
price = ""
def __init__(self):
pass
#####################################################
########class SpiderDefaultErrorHandler##############
class SpiderDefaultErrorHandler(urllib2.HTTPDefaultErrorHandler):
def http_error_default(self, req, fp, code, msg, hdrs):
"""
default error process handler for spider
"""
result = urllib2.HTTPError(req.get_full_url(), code, msg, hdrs, fp)
result.status = code
result.url = req.get_full_url()
print "<", result.url, "Exception code :", result.status, ">"
return result
#####################################################
#############class SpiderHandler#####################
class SpiderHandler:
"""
spider handler
"""
def spider(self, spiderConfig):
try:
request = urllib2.Request(spiderConfig.url)
## configure request hreader
for key,val in headerConfig.items():
request.add_header(key, val)
## build opener
opener = urllib2.build_opener(SpiderDefaultErrorHandler())
## open request
openRequest = opener.open(request)
## read data
spiderData = openRequest.read()
## close
opener.close()
if 0 == len(spiderData):
return
if ZIP_TYPE== openRequest.headers.get("Content-Encoding"):
spiderData = SpiderHandler.gzipData(self, spiderData)
if httplib.HTTPConnection.debuglevel == DEBUG and showSrcCode:
print spiderData
# parse html
SpiderHandler.parse(self, spiderData)
except Exception,x:
print "spider process Exception:", x
def parse(self, spiderData):
"""
parse html content
"""
if httplib.HTTPConnection.debuglevel == DEBUG:
charsetAnalyze = chardet.detect(spiderData)
print "analyze spider data encode :",charsetAnalyze["encoding"]
print "执行解析", fileName
soup = BeautifulSoup(spiderData)
encode = soup.originalEncoding
encoding = lambda x : x.encode(encode)
if httplib.HTTPConnection.debuglevel == DEBUG:
print "识别到编码：", encode
title = soup.head.title.string
print encoding(title)
spiderContents = soup.findAll(name="div", attrs={"class":"main-box avil"})
auctions = ["%s" % s for s in spiderContents]
if auctions is None:
return
auctionList = []
for auc in auctions:
auctionDomain = SpiderAuctionDomain()
# parse auction link
links = re.search(re.compile(r'<a href=[\"|\']http://ju.taobao.com/tg/life_home.htm\?item_id=([^>]*)[\"|\']', re.IGNORECASE), auc)
if links is not None :
auctionDomain.link = encoding("http://ju.taobao.com/tg/life_home.htm?item_id=" + "".join(["%s" % s for s in links.groups() if len(s) > 0]))
#parse auction title
titles = re.search(re.compile(r"([^>]*)</a></h3>", re.IGNORECASE), auc)
if titles is not None:
auctionDomain.title = encoding("".join(["%s" % t for t in titles.groups() if len(t) > 0]))
#parse auction price
price = re.search(re.compile(r"<strong class=\"J_juPrices\".*</b>([^<]*)</strong>", re.IGNORECASE), auc)
if price is not None:
auctionDomain.price = "".join(["%s" % p for p in price.groups() if len(p) > 0])
#parse image url
imgs = re.search(re.compile(r"<img src=[\'\"]([^>]*)[\'\"]", re.IGNORECASE), auc)
if imgs is not None:
auctionDomain.img = "".join(["%s" % i for i in imgs.groups() if len(i) > 0])
auctionList.append(auctionDomain)
print "成功解析商品信息："
for a in auctionList:
print "--->",a.title
# sort auction list
auctionList = SpiderHandler.sortAuctionList(self, auctionList)
# save in file
SpiderHandler.save(self, auctionList)
print "解析完成"
pass
def sortAuctionList(self, auctionList):
"""
冒泡排序，按照价格排序
"""
length = len(auctionList)
if length < 2:
return auctionList
else:
for i in range(length-1):
for j in range(length - i -1):
if float(auctionList[j].price) > float(auctionList[j+1].price):
auctionList[j], auctionList[j+1] = auctionList[j+1], auctionList[j]
return auctionList
pass
def save(self, auctionList):
if auctionList is not None:
doc = Document()
auctions = doc.createElement("auctions")
doc.appendChild(auctions)
for auc in auctionList:
auction = doc.createElement("auction")
auctions.appendChild(auction)
SpiderHandler.generateXML(self, doc, auction, "title", auc.title)
SpiderHandler.generateXML(self, doc, auction, "price", auc.price)
SpiderHandler.generateXML(self, doc, auction, "img", auc.img)
SpiderHandler.generateXML(self, doc, auction, "link", auc.link)
if False == os.path.exists(location):
os.mkdir(location)
file = open(location+fileName+".xml", 'w')
file.write(doc.toprettyxml())
file.close()
if httplib.HTTPConnection.debuglevel == DEBUG:
print doc.toprettyxml()
def generateXML(self, doc, f, name, txt):
c = doc.createElement(name)
f.appendChild(c)
c.appendChild(doc.createTextNode(txt))
def gzipData(self, spiderData):
"""
get data from gzip
"""
if 0 == len(spiderData):
return spiderData
spiderDataStream = StringIO.StringIO(spiderData)
spiderData = gzip.GzipFile(fileobj=spiderDataStream).read()
return spiderData
#####################################################
if __name__ == "__main__":
nowtime = lambda:datetime.datetime.strftime(datetime.datetime.now(),"%Y年%m月%d日 %H时%m分%S秒")
needSpiderUrl = {"suzhou":"http://ju.taobao.com/suzhou",
"hangzhou":"http://ju.taobao.com/hangzhou",
"shanghai":"http://ju.taobao.com/shanghai",
"beijing":"http://ju.taobao.com/beijing",
"chengdu":"http://ju.taobao.com/chengdu"}
configList = []
for k,v in needSpiderUrl.items():
spiderConfig = SpiderConfig(k, v)
configList.append(spiderConfig)
spiderHandler = SpiderHandler()
print "爬虫执行开始时间：",nowtime()
for spiderConfig in configList:
fileName = spiderConfig.name
spiderHandler.spider(spiderConfig)
print "爬虫执行完毕时间：",nowtime()Python是一种跨平台的、具有解释性、编译性、互动性和面向对象的脚本语言，其最初的设计是用于编写自动化脚本，随着版本的不断更新和新功能的添加，常用于用于开发独立的项目和大型项目。
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