摘要

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

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：http://my.oschina.net/jhao104/blog/547311

    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：