有关ajax的请求

• get请求
• post请求

get请求

下载豆瓣电影的第一页电影数据，一页有二十个。

import urllib.request

url = 'https://movie.douban.com/j/chart/top_list?type=25&interval_id=100%3A90&action=&start=0&limit=20'

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36'
}

# 1.请求对象的定制
request = urllib.request.Request(url=url,headers=headers)
# 2.获取响应数据
res = urllib.request.urlopen(request)
content = res.read().decode('utf-8')

# 3.数据下载到本地
# open方法默认情况下使用gbk编码。若想保存汉字，需指定编码格式
fp = open('douban.json','w',encoding='utf-8')
fp.write(content)
fp.close()


'''
17与18行的等价语句
with open('douban.json','w',encoding='utf-8') as fp:
    fp.write(content)
'''

下载豆瓣电影的前十页电影数据

'''
以下三个分别是第一页，第二页，第三个的Request URL
https://movie.douban.com/j/chart/top_list?type=25&interval_id=100%3A90&action=&start=0&limit=20

https://movie.douban.com/j/chart/top_list?type=25&interval_id=100%3A90&action=&start=20&limit=20

https://movie.douban.com/j/chart/top_list?type=25&interval_id=100%3A90&action=&start=40&limit=20
'''

import urllib.request
import urllib.parse

# 请求对象的定制
def createRequest(page):
    base_url = 'https://movie.douban.com/j/chart/top_list?type=25&interval_id=100%3A90&action=&'
    data = {
        'start':(page - 1)*20,
        'limit':20
    }
    data = urllib.parse.urlencode(data)

    url = base_url+data
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36'
    }

    request = urllib.request.Request(url=url,headers=headers)
    return request


# 获取响应数据
def getContent(request):
    res = urllib.request.urlopen(request)
    content = res.read().decode('utf-8')
    return content

# 下载数据
def Download(content,page):
    with open('douban'+str(page)+'.json','w',encoding='utf-8') as fp:
        fp.write(content)




if __name__ == '__main__':
    start_page = 1
    end_page = 10

    for page in range(start_page,end_page+1):
        req = createRequest(page)
        content = getContent(req)
        Download(content,page)

post请求

进入肯德基官网，点下角的餐厅查询，查看店铺位置信息。代码主要爬取在北京的肯德基店铺位置。

import urllib.request
import urllib.parse


def createRequest(page):
    base_url = 'http://www.kfc.com.cn/kfccda/ashx/GetStoreList.ashx?op=cname'
    data = {
        'cname': '北京',
        'pid':'',
        'pageIndex': page,
        'pageSize': '10'
    }
    data = urllib.parse.urlencode(data).encode('utf-8')
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36'
    }

    request = urllib.request.Request(url=base_url,data=data,headers=headers)
    return request


def getContent(request):
    res = urllib.request.urlopen(request)
    content = res.read().decode('utf-8')
    return content


def Download(content,page):
    with open('kfc_'+str(page)+'.json','w',encoding='utf-8') as fp:
        fp.write(content)




if __name__ == '__main__':
    start_page = 1
    end_page = 10

    for page in range(start_page,end_page+1):
        request = createRequest(page)
        content = getContent(request)
        Download(content,page)



'''
第一页
http://www.kfc.com.cn/kfccda/ashx/GetStoreList.ashx?op=cname
cname: 北京
pid:
pageIndex: 1
pageSize: 10

第二页
http://www.kfc.com.cn/kfccda/ashx/GetStoreList.ashx?op=cname
cname: 北京
pid:
pageIndex: 2
pageSize: 10
'''