引言

写这个小爬虫主要是为了爬校园论坛上的实习信息，主要采用了Requests库

源码

URLs.py

主要功能是根据一个初始url（包含page页面参数）来获得page页面从当前页面数到pageNum的url列表

import redef getURLs(url, attr, pageNum=1): all_links = [] try: now_page_number = int(re.search(attr+'=(\d+)', url, re.S).group(1)) for i in range(now_page_number, pageNum + 1): new_url = re.sub(attr+'=\d+', attr+'=%s' % i, url, re.S) all_links.append(new_url) return all_links except TypeError: print "arguments TypeError:attr should be string."

uni_2_native.py

由于论坛上爬取得到的网页上的中文都是unicode编码的形式，文本格式都为 &#XXXX;的形式，所以在爬得网站内容后还需要对其进行转换

import sysimport rereload(sys)sys.setdefaultencoding('utf-8')def get_native(raw): tostring = raw while True: obj = re.search('&#(.*?);', tostring, flags=re.S) if obj is None: break else: raw, code = obj.group(0), obj.group(1) tostring = re.sub(raw, unichr(int(code)), tostring) return tostring

存入SQLite数据库：saveInfo.py

# -*- coding: utf-8 -*-import MySQLdbclass saveSqlite(): def __init__(self): self.infoList = [] def saveSingle(self, author=None, title=None, date=None, url=None,reply=0, view=0): if author is None or title is None or date is None or url is None: print "No info saved!" else: singleDict = {} singleDict['author'] = author singleDict['title'] = title singleDict['date'] = date singleDict['url'] = url singleDict['reply'] = reply singleDict['view'] = view self.infoList.append(singleDict) def toMySQL(self): conn = MySQLdb.connect(host='localhost', user='root', passwd='', port=3306, db='db_name', charset='utf8') cursor = conn.cursor() # sql = "select * from info" # n = cursor.execute(sql) # for row in cursor.fetchall(): # for r in row: # print r # print '\n' sql = "delete from info" cursor.execute(sql) conn.commit() sql = "insert into info(title,author,url,date,reply,view) values (%s,%s,%s,%s,%s,%s)" params = [] for each in self.infoList: params.append((each['title'], each['author'], each['url'], each['date'], each['reply'], each['view'])) cursor.executemany(sql, params) conn.commit() cursor.close() conn.close() def show(self): for each in self.infoList: print "author: "+each['author'] print "title: "+each['title'] print "date: "+each['date'] print "url: "+each['url'] print "reply: "+str(each['reply']) print "view: "+str(each['view']) print '\n'if __name__ == '__main__': save = saveSqlite() save.saveSingle('网','aaa','2008-10-10 10:10:10','',1,1) # save.show() save.toMySQL()

主要爬虫代码

import requestsfrom lxml import etreefrom cc98 import uni_2_native, URLs, saveInfo# 根据自己所需要爬的网站，伪造一个headerheaders ={ 'Accept': '', 'Accept-Encoding': '', 'Accept-Language': '', 'Connection': '', 'Cookie': '', 'Host': '', 'Referer': '', 'Upgrade-Insecure-Requests': '', 'User-Agent': ''}url = 'http://www.cc98.org/list.asp?boardid=459&page=1&action='cc98 = 'http://www.cc98.org/'print "get infomation from cc98..."urls = URLs.getURLs(url, "page", 50)savetools = saveInfo.saveSqlite()for url in urls: r = requests.get(url, headers=headers) html = uni_2_native.get_native(r.text) selector = etree.HTML(html) content_tr_list = selector.xpath('//form/table[@class="tableborder1 list-topic-table"]/tbody/tr') for each in content_tr_list: href = each.xpath('./td[2]/a/@href') if len(href) == 0: continue else: # print len(href) # not very well using for, though just one element in list # but I don't know why I cannot get the data by index for each_href in href: link = cc98 + each_href title_author_time = each.xpath('./td[2]/a/@title') # print len(title_author_time) for info in title_author_time: info_split = info.split('\n') title = info_split[0][1:len(info_split[0])-1] author = info_split[1][3:] date = info_split[2][3:] hot = each.xpath('./td[4]/text()') # print len(hot) for hot_num in hot: reply_view = hot_num.strip().split('/') reply, view = reply_view[0], reply_view[1] savetools.saveSingle(author=author, title=title, date=date, url=link, reply=reply, view=view)print "All got! Now saving to Database..."# savetools.show()savetools.toMySQL()print "ALL CLEAR! Have Fun!"

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。