python3 实现爬取网站下所有URL
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- 获取首页元素信息:
- 首页的URL链接获取:
- 遍历第一次返回的结果:
- 递归循环遍历:
- 全部代码如下:
- 小结:
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- python3.6
- requests && bs4
- 采用递归方法,最终爬取网站所有链接
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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:
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)
演示结果如下:
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:
#!/usr/bin/env python # –*– coding:utf–8 –*–
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)
小结:
刚开始学习写python脚本,有不足之处,多多指导,有一个小bug,后期会进一步完善。
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