一天一爬虫：day02-百度贴吧_v1

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python2，requests库和re模块爬取百度贴吧内容，并存入文件
# -*- coding:utf-8 -*-#使用requests-reimport requests# from bs4 import BeautifulSoup# import bs4import reimport sysreload(sys)sys.setdefaultencoding( "utf-8" )#处理页面标签类class Tool:    #去除img标签,7位长空格    removeImg = re.compile('<img.*?>| {7}|')    #删除超链接标签    removeAddr = re.compile('<a.*?>|</a>')    #把换行的标签换为\n    replaceLine = re.compile('<tr>|<div>|</div>|</p>')    #将表格制表<td>替换为\t    replaceTD= re.compile('<td>')    #把段落开头换为\n加空两格    replacePara = re.compile('<p.*?>')    #将换行符或双换行符替换为\n    replaceBR = re.compile('<br><br>|<br>')    #将其余标签剔除    removeExtraTag = re.compile('<.*?>')    def replace(self,x):        x = re.sub(self.removeImg,"",x)        x = re.sub(self.removeAddr,"",x)        x = re.sub(self.replaceLine,"\n",x)        x = re.sub(self.replaceTD,"\t",x)        x = re.sub(self.replacePara,"\n    ",x)        x = re.sub(self.replaceBR,"\n",x)        x = re.sub(self.removeExtraTag,"",x)        #strip()将前后多余内容删除        return x.strip()#百度贴吧爬虫类class BDTB:    # 初始化，传入基地址，是否只看楼主的参数    def __init__(self, baseUrl, seeLZ, floorTag):        # base链接地址        self.baseURL = baseUrl        # 是否只看楼主        self.seeLZ = '?see_lz=' + str(seeLZ)        # HTML标签剔除工具类对象        self.tool = Tool()        # 全局file变量，文件写入操作对象        self.file = None        # 楼层标号，初始为1        self.floor = 1        # 默认的标题，如果没有成功获取到标题的话则会用这个标题        self.defaultTitle = u"百度贴吧"        # 是否写入楼分隔符的标记        self.floorTag = floorTag    #传入页码，获取该页帖子的代码    def getPage(self,pageNum):        try:            # 构建URL            url = self.baseURL + self.seeLZ + '&pn=' + str(pageNum)            r = requests.get(url)            r.raise_for_status()            r.encoding = r.apparent_encoding            return r.text        except :            return ''    def getTitle(self,text):        title = re.findall('<h3 class="core_title_txt.*?>(.*?)</h3>',text,re.S)        if title:            return title[0]        else:            return ''    # 获取帖子一共有多少页    def getPageNum(self,text):        result = re.findall('<li class="l_reply_num" .*?<span class="red">(.*?)</span>',text,re.S)        return result[0]    #获取每一层楼的内容,传入页面内容    def getContent(self,text):        items = re.findall('<div id="post_content_.*?>(.*?)</div>',text,re.S)        #floor = 1        contents = []        for item in items:            # print floor, u"楼-------------------------------------------------------------------"            # print self.tool.replace(item)            # floor += 1            # 将文本进行去除标签处理，同时在前后加入换行符            content = "\n" + self.tool.replace(item) + "\n"            contents.append(content.encode('utf-8'))        return contents    def setFileTitle(self,title):        #如果标题不是为None，即成功获取到标题        if title is not None:            self.file = open(title + ".txt","w+")        else:            self.file = open(self.defaultTitle + ".txt","w+")    def writeData(self,contents):        #向文件写入每一楼的信息        for item in contents:            if self.floorTag == '1':                #楼之间的分隔符                floorLine = "\n" + str(self.floor) + u"-----------------------------------------------------------------------------------------\n"                self.file.write(floorLine)            self.file.write(item)            self.floor += 1    def start(self):        indexPage = self.getPage(1)        pageNum = self.getPageNum(indexPage)        title = self.getTitle(indexPage)        self.setFileTitle(title)        if pageNum == None:            print "URL已失效，请重试"            return        try:            print "该帖子共有" + str(pageNum) + "页"            for i in range(1,int(pageNum)+1):                print "正在写入第" + str(i) + "页数据"                page = self.getPage(i)                contents = self.getContent(page)                self.writeData(contents)        #出现写入异常        except IOError,e:            print "写入异常，原因" + e.message        finally:            print "写入任务完成"print u"请输入帖子代号"baseURL = 'http://tieba.baidu.com/p/' + str(raw_input(u':>'))# baseURL = 'http://tieba.baidu.com/p/3138733512'seeLZ = raw_input("是否只获取楼主发言，是输入1，否输入0\n")floorTag = raw_input("是否写入楼层信息，是输入1，否输入0\n")bdtb = BDTB(baseURL,seeLZ,floorTag)bdtb.start()
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