分享一篇文章，原文来自： j_hao104的个人页面。

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

方法详细可以参考这篇博文：<u style="text-decoration: none; border-bottom: 1px dashed gray;">http://my.oschina.net/jhao104/blog/605963</u>

得到超级课程表登录的地址：<u style="text-decoration: none; border-bottom: 1px dashed gray;">http://120.55.151.61/V2/StudentSkip/loginCheckV4.action</u>

表单：

image.png

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。

image.png

3.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

image

和抓包时返回数据一样，证明登录成功

image.png

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 -*- 
# python学习交流群：103456743
""" 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：

image.png