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一、模擬登陸需要賬號(hào)，密碼的網(wǎng)址

一些不需要登陸的網(wǎng)址操作已經(jīng)試過(guò)了，這次來(lái)用Python嘗試需要登陸的網(wǎng)址，來(lái)利用cookie模擬登陸

由于我們教務(wù)系統(tǒng)有驗(yàn)證碼偏困難一點(diǎn)，故挑了個(gè)軟柿子捏，賽氪，https://www.saikr.com

我用的是火狐瀏覽器自帶的F12開(kāi)發(fā)者工具，打開(kāi)網(wǎng)址輸入賬號(hào)，密碼，登陸，如圖

可以看到捕捉到很多post和get請(qǐng)求，第一個(gè)post請(qǐng)求就是我們提交賬號(hào)和密碼的，

點(diǎn)擊post請(qǐng)求的參數(shù)選項(xiàng)可以看到我們提交的參數(shù)在bian表單數(shù)據(jù)里，name為賬戶名，pass為加密后的密碼，remember為是否記住密碼，0為不記住密碼。

我們?cè)賮?lái)看看headers，即消息頭

我們把這些請(qǐng)求頭加到post請(qǐng)求的headers后對(duì)網(wǎng)頁(yè)進(jìn)行模擬登陸，

Cookie為必填項(xiàng)，否則會(huì)報(bào)錯(cuò)：

{"code":403,"message":"訪問(wèn)超時(shí)，請(qǐng)重試，多次出現(xiàn)此提示請(qǐng)聯(lián)系QQ：1409765583","data":[]}

便可以創(chuàng)建一個(gè)帶有cookie的opener，在第一次訪問(wèn)登錄的URL時(shí)，將登錄后的cookie保存下來(lái)，然后利用帶有這個(gè)cookie的opener來(lái)訪問(wèn)該網(wǎng)址的其他版塊，查看登錄之后才能看到的信息。

比如我是登陸https://www.saikr.com/login后模擬登陸了“我的競(jìng)賽”版塊https://www.saikr.com/u/5598522

代碼如下： 

import urllib
from urllib import request
from http import cookiejar
login_url = "https://www.saikr.com/login"
postdata ={
"name": "your account","pass": "your password(加密后）"
}
header = {
"Accept":"application/json, text/javascript, */*; q=0.01",
"Accept-Language":"zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",
"Connection":"keep-alive",
"Host":"www.saikr.com",
"Referer":"https://www.saikr.com/login",
"Cookie":"your cookie",
"Content-Type":"application/x-www-form-urlencoded; charset=UTF-8",
"TE":"Trailers","X-Requested-With":"XMLHttpRequest"
}
postdata = urllib.parse.urlencode(postdata).encode('utf8')
#req = requests.post(url,postdata,header)
#聲明一個(gè)CookieJar對(duì)象實(shí)例來(lái)保存cookie
cookie = cookiejar.CookieJar()
#利用urllib.request庫(kù)的HTTPCookieProcessor對(duì)象來(lái)創(chuàng)建cookie處理器,也就CookieHandler
cookie_support = request.HTTPCookieProcessor(cookie)
 #通過(guò)CookieHandler創(chuàng)建opener
opener = request.build_opener(cookie_support)
#創(chuàng)建Request對(duì)象
my_url="https://www.saikr.com/u/5598522"
req1 = request.Request(url=login_url, data=postdata, headers=header)#post請(qǐng)求
req2 = request.Request(url=my_url)#利用構(gòu)造的opener不需要cookie即可登陸，get請(qǐng)求
response1 = opener.open(req1)
response2 = opener.open(req2)
print(response1.read().decode('utf8'))
print(response2.read().decode('utf8'))

到此就告一段落了： 

ps：有點(diǎn)小插曲，當(dāng)在headers里加入

時(shí)，最后在 print(response1.read().decode('utf8'))時(shí)便會(huì)報(bào)錯(cuò)

UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte

原因：在請(qǐng)求header中設(shè)置了'Accept-Encoding': 'gzip, deflate'

參考鏈接：https://www.cnblogs.com/chyu/p/4558782.html

解決方法：去掉Accept-Encoding后就正常了

二、模擬登陸網(wǎng)址常用方法總結(jié)

1.通過(guò)urllib庫(kù)的request庫(kù)的函數(shù)進(jìn)行請(qǐng)求

from urllib import request
#get請(qǐng)求
------------------------------------------------------
#不加headers
response=request.urlopen(url)
page_source = response.read().decode('utf-8')

#加headers,由于urllib.request.urlopen() 函數(shù)不接受headers參數(shù)，所以需要構(gòu)建一個(gè)urllib.request.Request對(duì)象來(lái)實(shí)現(xiàn)請(qǐng)求頭的設(shè)置
req= request.Request(url=url,headers=headers)
response=request.urlopen(req)
page_source = response.read().decode('utf-8')

#post請(qǐng)求
-------------------------------------------------------
postdata = urllib.parse.urlencode(data).encode('utf-8')#必須進(jìn)行重編碼
req= request.Request(url=url,data=postdata,headers=headers)
response=request.urlopen(req)
page_source = response.read().decode('utf-8')
#使用cookie訪問(wèn)其他版塊
#聲明一個(gè)CookieJar對(duì)象實(shí)例來(lái)保存cookie
cookie = cookiejar.CookieJar()
#利用urllib.request庫(kù)的HTTPCookieProcessor對(duì)象來(lái)創(chuàng)建cookie處理器,也就CookieHandler
cookie_support = request.HTTPCookieProcessor(cookie)
 #通過(guò)CookieHandler創(chuàng)建opener
opener = request.build_opener(cookie_support)
# 將Opener安裝位全局，覆蓋urlopen函數(shù)，也可以臨時(shí)使用opener.open()函數(shù)
#urllib.request.install_opener(opener)
#創(chuàng)建Request對(duì)象
my_url="https://www.saikr.com/u/5598522"
req2 = request.Request(url=my_url)
response1 = opener.open(req1)
response2 = opener.open(req2)
#或者直接response2=opener.open(my_url)
print(response1.read().decode('utf8'))
print(response2.read().decode('utf8'))

2.通過(guò)requests庫(kù)的get和post函數(shù)

import requests
import urllib
import json
#get請(qǐng)求
-----------------------------------------------------------
#method1
url="https://www.saikr.com/"
params={ 'key1': 'value1','key2': 'value2' }
real_url = base_url + urllib.parse.urlencode(params)
#real_url="https://www.saikr.com/key1=value1&key2=value2"
response=requests.get(real_url)
#method2
response=requests.get(url,params)
print(response.text)#<class 'str'>
print(response.content)# <class 'bytes'>

#post請(qǐng)求
login_url = "https://www.saikr.com/login"
postdata ={
"name": "1324802616@qq.com","pass": "my password",
}
header = {
"Accept":"application/json, text/javascript, */*; q=0.01",
"Accept-Language":"zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",
"Connection":"keep-alive",
"Host":"www.saikr.com",
"Referer":"https://www.saikr.com/login",
"Cookie":"mycookie",
"Content-Type":"application/x-www-form-urlencoded; charset=UTF-8",
"TE":"Trailers","X-Requested-With":"XMLHttpRequest"
}
#requests中的post中傳入的data可以不進(jìn)行重編碼
#login_postdata = urllib.parse.urlencode(postdata).encode('utf8')
response=requests.post(url=login_url,data=postdata,headers=header)#<class 'requests.models.Response'>
#以下三種都可以解析結(jié)果
json1 = response1.json()#<class 'dict'>
json2= json.loads(response1.text)#<class 'dict'>
json_str = response2.content.decode('utf-8')#<class 'str'>

#利用session維持會(huì)話訪問(wèn)其他版塊
--------------------------------------------------------------------
login_url = "https://www.saikr.com/login"
postdata ={
"name": "1324802616@qq.com","pass": "my password",
}
header = {
"Accept":"application/json, text/javascript, */*; q=0.01",
"Connection":"keep-alive",
"Referer":"https://www.saikr.com/login",
"Cookie":"mycookie",
}
session = requests.session()
response = session.post(url=url, data=data, headers=headers)
my_url="https://www.saikr.com/u/5598522"
response1 = session.get(url=my_url, headers=headers)
print(response1.json())