获取首页元素信息：

目标 test_URL：http://www.xxx.com.cn/

首先检查元素，a 标签下是我们需要爬取得链接，通过获取链接路径，定位出我们需要的信息

soup = Bs4(reaponse.text, "lxml")

urls_li = soup.select("#mainmenu_top > div > div > ul > li")

首页的URL链接获取：

完成首页的URL链接获取，具体代码如下：

'''

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'''

def get_first_url():

list_href = []

reaponse = requests.get("http://www.xxx.com.cn", headers=headers)

soup = Bs4(reaponse.text, "lxml")

urls_li = soup.select("#mainmenu_top > div > div > ul > li")

for url_li in urls_li:

urls = url_li.select("a")

for url in urls:

url_href = url.get("href")

list_href.append(head_url+url_href)

out_url = list(set(list_href))

for reg in out_url:

print(reg)

遍历第一次返回的结果：

从第二步获取URL的基础上，遍历请求每个页面，获取页面中的URL链接，过滤掉不需要的信息

具体代码如下：

def get_next_url(urllist):

url_list = []

for url in urllist:

response = requests.get(url,headers=headers)

soup = Bs4(response.text,"lxml")

urls = soup.find_all("a")

if urls:

for url2 in urls:

url2_1 = url2.get("href")

if url2_1:

if url2_1[0] == "/":

url2_1 = head_url + url2_1

url_list.append(url2_1)

if url2_1[0:24] == "http://www.xxx.com.cn":

url2_1 = url2_1

url_list.append(url2_1)

else:

pass

else:

pass

else:

pass

else:

pass

url_list2 = set(url_list)

for url_ in url_list2:

res = requests.get(url_)

if res.status_code ==200:

print(url_)

print(len(url_list2))

递归循环遍历：

递归实现爬取所有url，在get_next_url()函数中调用自身，代码如下：

get_next_url(url_list2)

全部代码如下：

import requests

from bs4 import BeautifulSoup as Bs4

head_url = "http://www.xxx.com.cn"

headers = {

"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36"

}

def get_first_url():

list_href = []

reaponse = requests.get(head_url, headers=headers)

soup = Bs4(reaponse.text, "lxml")

urls_li = soup.select("#mainmenu_top > div > div > ul > li")

for url_li in urls_li:

urls = url_li.select("a")

for url in urls:

url_href = url.get("href")

list_href.append(head_url+url_href)

out_url = list(set(list_href))

return out_url

def get_next_url(urllist):

url_list = []

for url in urllist:

response = requests.get(url,headers=headers)

soup = Bs4(response.text,"lxml")

urls = soup.find_all("a")

if urls:

for url2 in urls:

url2_1 = url2.get("href")

if url2_1:

if url2_1[0] == "/":

url2_1 = head_url + url2_1

url_list.append(url2_1)

if url2_1[0:24] == "http://www.xxx.com.cn":

url2_1 = url2_1

url_list.append(url2_1)

else:

pass

else:

pass

else:

pass

else:

pass

url_list2 = set(url_list)

for url_ in url_list2:

res = requests.get(url_)

if res.status_code ==200:

print(url_)

print(len(url_list2))

get_next_url(url_list2)

if __name__ == "__main__":

urllist = get_first_url()

get_next_url(urllist)

以上这篇Python3 实现爬取网站下所有URL方式就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持python博客。