python:爬虫之Post请求以及动态Ajax数据的爬取（3）

#爬虫的post方式
作用：对参数进行打包反馈给服务器

import urllib.request
import urllib.parse           #对参数打包
url = "http://www.sunck.wang:8085/form"
data = {
    "username":"sunck",
    "passwd":"123"
}
postdata = urllib.parse.urlencode(data).encode("utf-8")   #对data打包合成一个字典
#创建请求体
req = urllib.request.Request(url,data=postdata)
#发起请求,对req添加一个请求头
req.add_header("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0")
response = urllib.request.urlopen(req)
print(response.read().decode("utf-8"))

#抓取动态页面

def AjaxDemo(url) :
    headers ={
     "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36"
    }
    req = urllib.request.Request(url,headers=headers)
    context =ssl._create_unverified_context()          #使用ssl创建未验证的上下数据
    response = urllib.request.urlopen(req,context)
    JsonStr = response.read().decode("utf-8")
    data = json.loads(JsonStr)
    return data
url = "movie.douban.com/动态/"  #模拟动态url
print(AjaxDemo(url))