Python爬蟲抓取csdn博客
昨天晚上爲了下載保存某位csdn大牛的全部博文，寫了一個爬蟲來自動抓取文章並保存到txt文本，當然也可以 保存到html網頁中。這樣就可以不用Ctrl+C 和Ctrl+V了，非常方便，抓取別的網站也是大同小異。
爲了解析抓取的網頁，用到了第三方模塊，BeautifulSoup，這個模塊對於解析html文件非常有用，當然也可以自己使用正則表達式去解析，但是比較麻煩。
由於csdn網站的robots.txt文件中顯示禁止任何爬蟲，所以必須把爬蟲僞裝成瀏覽器，而且不能頻繁抓取，得sleep一會再抓，使用頻繁會被封ip的，但可以使用代理ip。
#-*- encoding: utf-8 -*- ''' Created on 2014-09-18 21:10:39 @author: Mangoer @email: [email protected] ''' import urllib2 import re from bs4 import BeautifulSoup import random import time class CSDN_Blog_Spider: def __init__(self,url): print '\n' print('已啓動網絡爬蟲。。。') print '網頁地址： ' + url user_agents = [ 'Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11', 'Opera/9.25 (Windows NT 5.1; U; en)', 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)', 'Mozilla/5.0 (compatible; Konqueror/3.5; Linux) KHTML/3.5.5 (like Gecko) (Kubuntu)', 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.12) Gecko/20070731 Ubuntu/dapper-security Firefox/1.5.0.12', 'Lynx/2.8.5rel.1 libwww-FM/2.14 SSL-MM/1.4.1 GNUTLS/1.2.9', "Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.7 (KHTML, like Gecko) Ubuntu/11.04 Chromium/16.0.912.77 Chrome/16.0.912.77 Safari/535.7", "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:10.0) Gecko/20100101 Firefox/10.0 ", ] # use proxy ip # ips_list = ['60.220.204.2:63000','123.150.92.91:80','121.248.150.107:8080','61.185.21.175:8080','222.216.109.114:3128','118.144.54.190:8118', # '1.50.235.82:80','203.80.144.4:80'] # ip = random.choice(ips_list) # print '使用的代理ip地址： ' + ip # proxy_support = urllib2.ProxyHandler({'http':'http://'+ip}) # opener = urllib2.build_opener(proxy_support) # urllib2.install_opener(opener) agent = random.choice(user_agents) req = urllib2.Request(url) req.add_header('User-Agent',agent) req.add_header('Host','blog.csdn.net') req.add_header('Accept','*/*') req.add_header('Referer','http://blog.csdn.net/mangoer_ys?viewmode=list') req.add_header('GET',url) html = urllib2.urlopen(req) page = html.read().decode('gbk','ignore').encode('utf-8') self.page = page self.title = self.getTitle() self.content = self.getContent() self.saveFile() def printInfo(self): print('文章標題是： '+self.title + '\n') print('內容已經存儲到out.txt文件中！') def getTitle(self): rex = re.compile('<title>(.*?)</title>',re.DOTALL) match = rex.search(self.page) if match: return match.group(1) return 'NO TITLE' def getContent(self): bs = BeautifulSoup(self.page) html_content_list = bs.findAll('div',{'id':'article_content','class':'article_content'}) html_content = str(html_content_list[0]) rex_p = re.compile(r'(?:.*?)>(.*?)<(?:.*?)',re.DOTALL) p_list = rex_p.findall(html_content) content = '' for p in p_list: if p.isspace() or p == '': continue content = content + p return content def saveFile(self): outfile = open('out.txt','a') outfile.write(self.content) def getNextArticle(self): bs2 = BeautifulSoup(self.page) html_nextArticle_list = bs2.findAll('li',{'class':'prev_article'}) # print str(html_nextArticle_list[0]) html_nextArticle = str(html_nextArticle_list[0]) # print html_nextArticle rex_link = re.compile(r'<a href=\"(.*?)\"',re.DOTALL) link = rex_link.search(html_nextArticle) # print link.group(1) if link: next_url = 'http://blog.csdn.net' + link.group(1) return next_url return None class Scheduler: def __init__(self,url): self.start_url = url def start(self): spider = CSDN_Blog_Spider(self.start_url) spider.printInfo() while True: if spider.getNextArticle(): spider = CSDN_Blog_Spider(spider.getNextArticle()) spider.printInfo() elif spider.getNextArticle() == None: print 'All article haved been downloaded!' break time.sleep(10) #url = input('請輸入CSDN博文地址：') url = "http://blog.csdn.net/mangoer_ys/article/details/38427979" Scheduler(url).start()
程序中有個問題一直不能解決：不能使用標題去命名文件，所以所有的文章全部放在一個out.txt中，說的編碼的問題，希望大神可以解決這個問題。