Python3 实现爬取网站下所有URL方式

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：

'''
遇到不懂的问题？python学习交流群：821460695满足你的需求，资料都已经上传群文件，可以自行下载！
'''
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。