大多数APP里面返回的是json格式数据，或者一堆加密过的数据 。这里以超级课程表APP为例，抓取超级课程表里用户发的话题。
1、抓取APP数据包
方法详细可以参考这篇博文：Fiddler如何抓取手机APP数据包
得到超级课程表登录的地址：http://120.55.151.61/V2/StudentSkip/loginCheckV4.action
表单：
表单中包括了用户名和密码，当然都是加密过了的，还有一个设备信息，直接post过去就是。
另外必须加header,一开始我没有加header得到的是登录错误，所以要带上header信息。
2、登录
登录代码：
import urllib2 from cookielib import CookieJar loginUrl = 'http://120.55.151.61/V2/StudentSkip/loginCheckV4.action' headers = { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8', 'User-Agent': 'Dalvik/1.6.0 (Linux; U; Android 4.1.1; M040 Build/JRO03H)', 'Host': '120.55.151.61', 'Connection': 'Keep-Alive', 'Accept-Encoding': 'gzip', 'Content-Length': '207', } loginData = 'phoneBrand=Meizu&platform=1&deviceCode=868033014919494&account=FCF030E1F2F6341C1C93BE5BBC422A3D&phoneVersion=16&password=A55B48BB75C79200379D82A18C5F47D6&channel=MXMarket&phoneModel=M040&versionNumber=7.2.1&' cookieJar = CookieJar() opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookieJar)) req = urllib2.Request(loginUrl, loginData, headers) loginResult = opener.open(req).read() print loginResult
登录成功 会返回一串账号信息的json数据
和抓包时返回数据一样，证明登录成功
3、抓取数据
用同样方法得到话题的url和post参数
做法就和模拟登录网站一样。详见：Python爬虫模拟登录带验证码网站
下见最终代码，有主页获取和下拉加载更新。可以无限加载话题内容。
#!/usr/local/bin/python2.7 # -*- coding: utf8 -*- """ 超级课程表话题抓取 """ import urllib2 from cookielib import CookieJar import json ''' 读Json数据 ''' def fetch_data(json_data): data = json_data['data'] timestampLong = data['timestampLong'] messageBO = data['messageBOs'] topicList = [] for each in messageBO: topicDict = {} if each.get('content', False): topicDict['content'] = each['content'] topicDict['schoolName'] = each['schoolName'] topicDict['messageId'] = each['messageId'] topicDict['gender'] = each['studentBO']['gender'] topicDict['time'] = each['issueTime'] print each['schoolName'],each['content'] topicList.append(topicDict) return timestampLong, topicList ''' 加载更多 ''' def load(timestamp, headers, url): headers['Content-Length'] = '159' loadData = 'timestamp=%s&phoneBrand=Meizu&platform=1&genderType=-1&topicId=19&phoneVersion=16&selectType=3&channel=MXMarket&phoneModel=M040&versionNumber=7.2.1&' % timestamp req = urllib2.Request(url, loadData, headers) loadResult = opener.open(req).read() loginStatus = json.loads(loadResult).get('status', False) if loginStatus == 1: print 'load successful!' timestamp, topicList = fetch_data(json.loads(loadResult)) load(timestamp, headers, url) else: print 'load fail' print loadResult return False loginUrl = 'http://120.55.151.61/V2/StudentSkip/loginCheckV4.action' topicUrl = 'http://120.55.151.61/V2/Treehole/Message/getMessageByTopicIdV3.action' headers = { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8', 'User-Agent': 'Dalvik/1.6.0 (Linux; U; Android 4.1.1; M040 Build/JRO03H)', 'Host': '120.55.151.61', 'Connection': 'Keep-Alive', 'Accept-Encoding': 'gzip', 'Content-Length': '207', } ''' ---登录部分--- ''' loginData = 'phoneBrand=Meizu&platform=1&deviceCode=868033014919494&account=FCF030E1F2F6341C1C93BE5BBC422A3D&phoneVersion=16&password=A55B48BB75C79200379D82A18C5F47D6&channel=MXMarket&phoneModel=M040&versionNumber=7.2.1&' cookieJar = CookieJar() opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookieJar)) req = urllib2.Request(loginUrl, loginData, headers) loginResult = opener.open(req).read() loginStatus = json.loads(loginResult).get('data', False) if loginResult: print 'login successful!' else: print 'login fail' print loginResult ''' ---获取话题--- ''' topicData = 'timestamp=0&phoneBrand=Meizu&platform=1&genderType=-1&topicId=19&phoneVersion=16&selectType=3&channel=MXMarket&phoneModel=M040&versionNumber=7.2.1&' headers['Content-Length'] = '147' topicRequest = urllib2.Request(topicUrl, topicData, headers) topicHtml = opener.open(topicRequest).read() topicJson = json.loads(topicHtml) topicStatus = topicJson.get('status', False) print topicJson if topicStatus == 1: print 'fetch topic success!' timestamp, topicList = fetch_data(topicJson) load(timestamp, headers, topicUrl)
结果：
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