获取慕课网视频教程
发布时间:2020-12-17 17:10:16 所属栏目:Python 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 # -*- coding: utf-8 -*-from scrapy.spider import Spiderfrom scrapy.http.request import Requestfrom scrapy.selector import Selectorfrom scrap
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以下代码由PHP站长网 52php.cn收集自互联网 现在PHP站长网小编把它分享给大家,仅供参考 # -*- coding: utf-8 -*-
from scrapy.spider import Spider
from scrapy.http.request import Request
from scrapy.selector import Selector
from scrapy.exceptions import NotSupported
from scrapy import log
import urlparse
import json
import urllib
from meizi.items import ImoocItem
__author__ = 'lpe234'
class ImoocSpider(Spider):
"""
本爬虫旨在帮助不方便联网观看视频教程的同学。
其实“慕课网”还是蛮不错,希望各位不要乱跑本脚本!!!
"""
name = 'immoc'
start_urls = ['http://www.imooc.com/course/list']
def parse(self,response):
"""
爬虫默认入口,旨在获取所有视频教程的 标题 以及 详细页 数据
:param response:
:return:
"""
sel = Selector(response)
# 获取本页所有视频节点
nodes = sel.xpath('//ul/li[@class="course-one"]')
for node in nodes:
try:
title = node.xpath('./a/h5/span/text()').extract()[0]
href = node.xpath('./a/@href').extract()[0]
href = urlparse.urljoin(response.url,href)
# 将 url 中的 view -> learn 即可得到 视频详细页列表
href = href.replace(u'view',u'learn')
if title and href:
yield Request(
url=href,callback=self.parse_list,meta={'title': title}
)
except(IndexError,TypeError):
continue
# 多页情况
pages = sel.xpath('//div[@class="page"]/a[@href]')
for page in pages:
try:
href = page.xpath('./@href').extract()[0]
href = urlparse.urljoin(response.url,href)
if href and href.startswith('http'):
yield Request(
url=href,callback=self.parse,)
except(IndexError,TypeError,NotSupported):
continue
def parse_list(self,response):
"""
视频列表页 解析
:param response:
:return:
"""
"""
{"result":0,"data":{"result":{"mid":8124,"mpath":
["http://v1.mukewang.com/f9fd506a-bf14-4ede-96c4-1d69d2fd26e7/H.mp4","http://v1.mukewang.com/f9fd506a-bf14-4ede-96c4-1d69d2fd26e7/M.mp4","http://v1.mukewang.com/f9fd506a-bf14-4ede-96c4-1d69d2fd26e7/L.mp4"],"cpid":"2095","name":"NSMutableDictionary","time":"34","practise":[]}},"msg":"u6210u529f"}
"""
# 查看js文件可以得到 视频地址获取接口如下 GET -> json
pre_href = 'http://www.imooc.com/course/ajaxmediainfo/?mid={}'
title = response.meta.get('title')
sel = Selector(response)
nodes = sel.xpath('//div[@class="course_chapter_list"]//a[@class="studyvideo"]')
videos = []
for node in nodes:
try:
section = node.xpath('./text()').extract()[0]
section = section.strip().replace('r','').replace('n','')
video_id = node.xpath('./@href').extract()[0]
video_id = video_id.split('/')[-1]
if section and video_id:
href = pre_href.format(video_id)
response = urllib.urlopen(href)
data = json.loads(response.read())
# 此处存在三种模式 0:超清 1:高清 2:普清
url = data['data']['result']['mpath'][0]
videos.append({section: url})
except(IndexError,ValueError):
continue
item = ImoocItem()
item['title'] = title
item['videos'] = videos
yield item
def parse_details(self,response):
pass
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