编写Python脚本抓取网络小说来制作自己的阅读器

# -*- coding: utf-8 -*- 
 
import urllib2 
import re 
import thread 
import chardet 
 
class Book_Spider: 
 
  def __init__(self): 
    self.pages = [] 
    self.page = 1 
    self.flag = True 
    self.url = "http://www.quanben.com/xiaoshuo/10/10412/2095096.html" 
 
  # 将抓取一个章节 
  def GetPage(self): 
    myUrl = self.url 
    user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)' 
    headers = { 'User-Agent' : user_agent } 
    req = urllib2.Request(myUrl, headers = headers) 
    myResponse = urllib2.urlopen(req) 
    myPage = myResponse.read() 
 
    charset = chardet.detect(myPage) 
    charset = charset['encoding'] 
    if charset == 'utf-8' or charset == 'UTF-8': 
      myPage = myPage 
    else: 
      myPage = myPage.decode('gb2312','ignore').encode('utf-8') 
    unicodePage = myPage.decode("utf-8") 
 
    # 找出 id="content"的div标记 
    try: 
      #抓取标题 
      my_title = re.search('<h1>(.*&#63;)</h1>',unicodePage,re.S) 
      my_title = my_title.group(1) 
    except: 
      print '标题 HTML 变化，请重新分析！' 
      return False 
     
    try: 
      #抓取章节内容 
      my_content = re.search('<div.*&#63;id="htmlContent" class="contentbox">(.*&#63;)<div',unicodePage,re.S) 
      my_content = my_content.group(1) 
    except: 
      print "内容 HTML 变化，请重新分析！" 
      return False 
     
    my_content = my_content.replace("<br />","\n") 
    my_content = my_content.replace(" "," ") 
 
    #用字典存储一章的标题和内容 
    onePage = {'title':my_title,'content':my_content} 
 
    try: 
      #找到页面下方的连接区域 
      foot_link = re.search('<div.*&#63;class="chapter_Turnpage">(.*&#63;)</div>',unicodePage,re.S) 
      foot_link = foot_link.group(1) 
      #在连接的区域找下一页的连接，根据网页特点为第三个 
      nextUrl = re.findall(u'<a.*&#63;href="(.*&#63;)".*&#63;>(.*&#63;)</a>',foot_link,re.S) 
      nextUrl = nextUrl[2][0] 
      # 更新下一次进行抓取的链接 
      self.url = nextUrl 
    except: 
      print "底部链接变化，请重新分析!" 
      return False 
 
    return onePage 
 
  # 用于加载章节 
  def LoadPage(self): 
    while self.flag: 
      if(len(self.pages) - self.page < 3): 
        try: 
          # 获取新的页面 
          myPage = self.GetPage() 
 
          if myPage == False: 
            print '抓取失败！' 
            self.flag = False 
       
          self.pages.append(myPage) 
        except: 
          print '无法连接网页！' 
          self.flag = False 
 
  #显示一章 
  def ShowPage(self,curPage): 
      print curPage['title'] 
      print curPage['content'] 
      print "\n" 
      user_input = raw_input("当前是第 %d 章，回车读取下一章或者输入 quit 退出：" % self.page) 
      if(user_input == 'quit'): 
        self.flag = False 
      print "\n" 
 
  def Start(self): 
    print u'开始阅读......\n' 
 
    # 新建一个线程 
    thread.start_new_thread(self.LoadPage,()) 
 
    # 如果self的page数组中存有元素 
    while self.flag: 
      if self.page <= len(self.pages): 
        nowPage = self.pages[self.page-1] 
        self.ShowPage(nowPage) 
        self.page += 1 
 
    print u"本次阅读结束" 
 
 
#----------- 程序的入口处 ----------- 
print u""" 
--------------------------------------- 
  程序：阅读呼叫转移 
  版本：0.2 
  作者：angryrookie 
  日期：2014-07-07 
  语言：Python 2.7 
  功能：按下回车浏览下一章节 
--------------------------------------- 
""" 
 
print u'请按下回车：' 
raw_input(' ') 
myBook = Book_Spider() 
myBook.Start()