爬虫的架构核心是URL存储器、网页下载器、网页解析器。今天我们来说的是网页下载器。网页下载器的核心知识点：使用的模块：urllib.request、http.cookiejar方法：urllib.request.urlopen()、read()、Request(url)解释：response是一个 HTTPResposne 类型的对象实例代码：import urllib.requestimport http.cookiejarurl = 'http://www.baidu.com'print('第一种方法')response1 = urllib.request.urlopen(url)print(response1.getcode())print(len(response1.read()))print("第二种方法")request = urllib.request.Request(url)request.add_header("user-agent","Mozilla/5.0")response2 = urllib.request.urlopen(url)print(response2.getcode())print(len(response2.read()))print("第三种方法")cj = http.cookiejar.CookieJar()opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))urllib.request.install_opener(opener)response3 = urllib.request.urlopen(url)print(response3.getcode())print(cj)print("网页内容如下：")print(response3.read())
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