python爬蟲爬取csdn部落格專家所有部落格內容

#coding:utf-8

import urllib2
from bs4 import BeautifulSoup
import os
import re
#import sys
#reload(sys)
#sys.setdefaultencoding("utf-8")


def getPage(href): #偽裝成瀏覽器登陸,獲取網頁原始碼
    headers = {  
        'User-Agent':'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6'  
    }  
    req = urllib2.Request(  
        url = href ,
        headers = headers  
    )
    try:
        post = urllib2.urlopen(req)
    except urllib2.HTTPError,e:
        print e.code
        print e.reason
    return post.read()

url = 'http://blog.csdn.net/experts.html'

def getEvery(url):
    hrefList = []
    page = BeautifulSoup(getPage(url))
    div = page.find('div',class_='side_nav')
    liList = div.find_all('li')
    for li in liList:
        href = 'http://blog.csdn.net' + li.a.get('href')
        if href!='http://blog.csdn.net/experts.html':
            hrefList.append(href)
    return hrefList
#第一部分：得到首頁部落格專家各個系列連結
#===============================================================================
def getAll(href): #得到每個類別所有專家的姓名和部落格首頁地址
    page=BeautifulSoup(getPage(href))  #得到移動專家首頁原始碼，並beautifulsoup化
    div = page.find('div',class_='list_3',id='experts')
    for li in div.find_all('li'):
        name = li.get_text()
        href = li.a.get('href')
        getBlog(name,href)
#第二部分：得到每類所有專家的姓名和首頁連結
#===============================================================================
def getPageNum(href):
    num =0
    page = getPage(href)
    soup = BeautifulSoup(page)
    div = soup.find('div',class_='pagelist')
    if div:
        result = div.span.get_text().split(' ')
        list_num = re.findall("[0-9]{1}",result[3])
        for i in range(len(list_num)):
            num = num*10 + int(list_num[i]) #計算總的頁數
        return num
    else:
        return 0

def getText(name,url):
    page = BeautifulSoup(getPage(url))
    span_list = page.find_all('span',class_='link_title')
    div_list = page.find_all('div',class_='article_description')
    k =0
    str1 = 'none'
    fp = open("text\%s.txt" % name,"a")
    # 獲取文章內容和內容
    for div in div_list:
        title = span_list[k].a.get_text().strip()
        text = div.get_text()
        title = title.encode('utf-8')  #轉換成utf-8編碼，否則後文寫不到檔案裡
        text = text.encode('utf-8')
        #print title
        k+=1
        fp.write(str(title) + '\n' + str(text) + '\n')
        fp.write('===========================================' + '\n')
        
    fp.close()

def getBlog(name,href):
    i =1
    for i in range(1,(getPageNum(href)+1)):
        url = href + '/article/list/' + str(i)
        print url
        getText(name,url)
        i+=1
    print href,'======================================OK'
    
#第三部分：得到每類所有專家的部落格內容連結
#===============================================================================


if __name__=="__main__":
    hrefList = getEvery(url)
    for href in hrefList:
        getAll(href)