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Python爬蟲獲取整個站點中的所有外部鏈接代碼示例

 更新時間:2017年12月26日 10:29:32   作者:土肥圓的猿  
這篇文章主要介紹了Python爬蟲獲取整個站點中的所有外部鏈接代碼示例,具有一定借鑒價值,需要的朋友可以參考下

收集所有外部鏈接的網(wǎng)站爬蟲程序流程圖

下例是爬取本站python繪制條形圖方法代碼詳解的實例,大家可以參考下。

完整代碼:

#! /usr/bin/env python
#coding=utf-8

import urllib2
from  bs4 import BeautifulSoup
import re
import datetime
import random

pages=set()
random.seed(datetime.datetime.now())
#Retrieves a list of all Internal links found on a page
def getInternalLinks(bsObj, includeUrl):
        internalLinks  =  []
        #Finds all links  that  begin  with  a  "/"
        for link  in bsObj.findAll("a", href=re.compile("^(/|.*"+includeUrl+")")):
                if link.attrs['href'] is not None:
                        if link.attrs['href'] not in internalLinks:
                                internalLinks.append(link.attrs['href'])
        return internalLinks
#Retrieves a list of all external links found on a page
def getExternalLinks(bsObj, excludeUrl):
        externalLinks  =  []
        #Finds all links  that  start  with  "http" or "www"  that  do
        #not  contain the current URL
        for link  in bsObj.findAll("a", 
                              href=re.compile("^(http|www)((?!"+excludeUrl+").)*$")):
                if link.attrs['href'] is not None:
                        if link.attrs['href'] not in externalLinks:
                                externalLinks.append(link.attrs['href'])
        return externalLinks

def splitAddress(address):
        addressParts  =  address.replace("http://", "").split("/")
        return addressParts

def getRandomExternalLink(startingPage):
        html=  urllib2.urlopen(startingPage)
        bsObj  =  BeautifulSoup(html)
        externalLinks  =  getExternalLinks(bsObj, splitAddress(startingPage)[0])
        if len(externalLinks) == 0:
                internalLinks  =  getInternalLinks(startingPage)
                return internalLinks[random.randint(0, len(internalLinks)-1)]
        else:
                return externalLinks[random.randint(0, len(externalLinks)-1)]

def followExternalOnly(startingSite):
        externalLink=getRandomExternalLink("http://www.dbjr.com.cn/article/130968.htm")
        print("Random  external  link  is: "+externalLink)
        followExternalOnly(externalLink)

#Collects a list of all external URLs found on the site
allExtLinks=set()
allIntLinks=set()
def getAllExternalLinks(siteUrl):
    html=urllib2.urlopen(siteUrl)
    bsObj=BeautifulSoup(html)
    internalLinks  =  getInternalLinks(bsObj,splitAddress(siteUrl)[0])
    externalLinks  =  getExternalLinks(bsObj,splitAddress(siteUrl)[0])
    for link in externalLinks:
      if link not in allExtLinks:
        allExtLinks.add(link)
        print(link)
    for link in internalLinks:
      if link not in allIntLinks:
        print("About to get link:"+link)
        allIntLinks.add(link)
        getAllExternalLinks(link)

getAllExternalLinks("http://www.dbjr.com.cn/article/130968.htm")

爬取結(jié)果如下:

總結(jié)

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