Python实现的文轩网爬虫完整示例

encoding=utf8
import pymysql
import time
import sys
import requests
import os
#捕获错误
import traceback
import types
#将html实体化
import cgi
import warnings
reload(sys)
sys.setdefaultencoding('utf-8')
from pyquery import PyQuery as pq
from lxml import etree
sys.setdefaultencoding('utf-8')
#屏蔽错误
warnings.filterwarnings("ignore")
#下载图片
def dowloadPic(imageUrl,filePath):
r = requests.get(imageUrl,timeout=60)
status=r.status_code
if status == 404:
return 404
with open(filePath, "wb") as code:
code.write(r.content)
#根据详情页地址抓取数据并插入数据库
def getData(final_url):
file_open=open('./url.txt', 'w')
file_open.write(final_url)
file_open.close()
#链接数据库
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='root', db='bookinfo', charset='utf8')
#设置浮标
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
#解析详情页面
try:
detail_url=final_url
c=pq(detail_url)
head=c('html').attr('xmlns')
err='http://www.w3.org/1999/xhtml'
err1='http://www.winxuan.com/cms/2016db_sh'
if head == err or head == err1:
return 'back'
except Exception, e:
return 'back'
i=0
while i<12:
  text = c('#page').find('.cont').find('li').eq(i).text()
  text=text.replace('　','')
  if 'I S B N' in text:
    isbn=text.replace('I S B N：','')
    isbn=isbn.strip()
    sel='select count(*) from bi_book where isbn ='+isbn
    cursor.execute(sel)
    result=cursor.fetchone()
    count=result['count(*)']
    if count != 0 :
      print u'已存在'
      return 'back'
  if 'isbn：' in text :
    isbn=text.replace('isbn：','')
    isbn=isbn.strip()
    sel='select count(*) from bi_book where isbn ='+isbn
    cursor.execute(sel)
    result=cursor.fetchone()
    count=result['count(*)']
    if count != 0 :
      print u'已存在'
      return 'back'
  if '作者：' in text :
    author = text.replace('作者：','')
  if '出版社：' in text :
    press_name=text.replace('出版社：','')
  if '版次：' in text :
    edition=text.replace('版次：','')
  if '印次：' in text :
    impressions=text.replace('印次：','')
  if '装帧：' in text :
    packaging=text.replace('装帧：','')
  if '开本：' in text:
    size=text.replace('开本：','')
  if '出版时间：' in text:
    press_time=text.replace('出版时间：','')
    press_time=press_time.strip()
    if press_time == '无':
      press_time='1970-01-01'
  if '印刷时间：' in text:
    print_time=text.replace('印刷时间：','')
    print_time=print_time.strip()
    if print_time== '无':
      print_time='1970-01-01'
  if '页数：' in text:
    page_num=text.replace('页数：','')
  if '字数：' in text:
    word_num=text.replace('字数：','')
  i+=1
if ('author' in locals().keys()) == False:
  author = ''
if ('press_time' in locals().keys()) == False:
  press_time = '1970-01-01'
if ('print_time' in locals().keys()) == False:
  print_time = '1970-01-01'
if ('impressions' in locals().keys()) == False:
  impressions = ''
if ('edition' in locals().keys())== False:
  edition = ''
if ('page_num' in locals().keys())== False:
  page_num = ''
if ('word_num' in locals().keys())== False:
  word_num = ''
if ('packaging' in locals().keys())== False:
  packaging = ''
if ('size' in locals().keys())== False:
  size = ''
if ('press_name' in locals().keys())== False:
  press_name = ''
#暂无图片地址
none_img='http://static.winxuancdn.com/goods/sml_blank.jpg'
#获取大小图地址
big_path=c('.info-side').find('.img').find('a').find('img').attr('src')
if big_path is None:
  return 'back'
elif big_path == none_img :
  big_path=''
  small_path=''
else :
  small_path=big_path.replace('_16','_11')
#获取分类
#先获取a标签html
ahtml=c('#page').find('.base-nav').eq(0).html()
#解析a标签html
cate=pq(ahtml)
#获取分类的最后一个分类
category=cate('a:last').text()
#获取书名
name=c('.info-main').find('.name').eq(0).find('h1').eq(0).text()
name=name.strip()
#获取价格
price=c('.info-main').find('.attr').eq(0).find('.price-n').eq(0).find('b').text()
price=price.replace('¥','')
#循环获取内容简介和目录信息
k=5
while k<12:
  title=c('#page').find('.title').eq(k).find('.tab').find('h4').text()
  if '内容简介' in title:
    con=c('#page').find('.title').eq(k).nextAll()
    det=pq(con)
    content=det('.text-words-1').html()
    content=content.encode("utf8", "ignore");
  if '目录' in title:
    con=c('#page').find('.title').eq(k).nextAll()
    dry=pq(con)
    directory=dry('.text-words-1').html()
    directory=directory.encode("utf8", "ignore");
  k+=1
#如果内容简介和目录没有的时候指定为空字符串
if ('content' in locals().keys())== False:
  content = ''
if ('directory' in locals().keys())== False:
  directory = ''
details  = '内容简介<br>'+content+'<br><br>目录<br>'+directory
details=cgi.escape(details)
#录入时间
add_time = time.strftime('%Y-%m-%d',time.localtime(time.time()))
#下载小图
#文件根目录
root_path=sys.path[0]
#创建isbn文件夹路径
root_path=root_path.replace('\\','/')
isbn_path=root_path+'/download/'+isbn
if big_path != '' and small_path !='' :
  #创建isbn目录
  if os.path.isdir(isbn_path) ==False :
    os.mkdir(isbn_path)
    #组合下载后图片保存路径
    down_img_small = isbn_path+"/small"+isbn+".jpg"
    down_img_big  = isbn_path+'/big'+isbn+".jpg"
    #调用下载图片方法
    small_res=dowloadPic(small_path,down_img_small)
    #大图保存数据库路径
    big_res=dowloadPic(big_path,down_img_big)
    #小图保存数据库路径
    if small_res==404 :
      img_small = 'none-picture/none-small.jpg'
    else :
      img_small = 'download/'+isbn+'/small'+isbn+'.jpg'
    if big_res==404 :
      img_big = 'none-picture/none-big.jpg'
    else :
      img_big  = 'download/'+isbn+'/big'+isbn+'.jpg'
  else :
    #组合保存数据库中的图片路径
    img_small = 'download/'+isbn+'/small'+isbn+'.jpg'
    img_big  = 'download/'+isbn+'/big'+isbn+'.jpg'
else :
  img_big = 'none-picture/none-big.jpg'
  img_small = 'none-picture/none-small.jpg'
source_type = 3
try :
  #要插入的列表
  li=[0,source_type,category,details,detail_url,price,add_time,packaging,print_time,impressions,name,author,press_name,isbn,edition,size,press_time,page_num,word_num,img_big,img_small]
  #执行sql
  sql="insert into bi_book (book_id,source_type,category,details,detail_url,price,add_time,packaging,print_time,impressions,name,author,press_name,isbn,edition,size,press_time,page_num,word_num,img_big,img_small) values(%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)"
  aaa=cursor.execute(sql,li)
  if aaa==1:
    print u'插入成功'
  conn.commit()
except Exception, e :
  return 'back'
def winxuan(n):
#首页解析
home_url='http://www.winxuan.com/'
h=pq(home_url)
#分类导航链接
menu=h('.mod-mainmenu').find('dd').find('a').eq(n).attr('href')
#print menu
#分类书籍首页
try:
mh=pq(menu)
except Exception, e :
return 'backs'
# text=mh('.main').find('a').text()
# text=text.encode("GBK", "ignore");
li=[]
u=0
while u<248 :
detail_urls=mh('.main').find('a').eq(u).attr('href')
#将取到所有地址放入到列表当中
li.append(detail_urls)
u+=1
#进行列表去重
li=list(set(li))
for final_url in li:
try:
result=getData(final_url)
except Exception, e :
continue
if result=='back' :
continue
print 'OK,finished'
n=0
while n<58:
while n<58:
print n
string=str(n)
file_open=open('./number.txt', 'w')
file_open.write(string)
file_open.close()
res=winxuan(n)
n+=1
if res=='backs' :
continue