#-*-coding:utf8-*- #created by 10412 import urllib import urllib2 import re #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) request = urllib2.Request(url) response = urllib2.urlopen(request) #返回UTF-8格式编码内容 return response.read().decode('utf-8') #无法连接，报错 except urllib2.URLError, e: if hasattr(e,"reason"): print u"连接百度贴吧失败,错误原因",e.reason return None #获取帖子标题 def getTitle(self,page): #得到标题的正则表达式 pattern = re.compile('<h1 class="core_title_txt.*?>(.*?)</h1>',re.S) result = re.search(pattern,page) if result: #如果存在，则返回标题 return result.group(1).strip() else: return None
def (self,page): #获取帖子页数的正则表达式 pattern = re.compile('<li class="l_reply_num.*?</span>.*?<span.*?>(.*?)</span>',re.S) result = re.search(pattern,page) if result: return result.group(1).strip() else: return None #获取每一层楼的内容,传入页面内容 def getContent(self,page): #匹配所有楼层的内容 pattern = re.compile('<div id="post_content_.*?>(.*?)</div>',re.S) items = re.findall(pattern,page) contents = [] for item in items: #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'http://tieba.baidu.com/p/')) seeLZ = raw_input("是否只获取楼主发言，是输入1，否输入0n") floorTag = raw_input("是否写入楼层信息，是输入1，否输入0n") bdtb = BDTB(baseURL,seeLZ,floorTag) bdtb.start()
运行后截图如下：
备注：
运行后注意输入帖子的代号先在网址后空格，再输入帖子代号，输入完再把刚才的空格
删除，只有这样才不会报错。
Traceback (most recent call last): File “E:/python/code/PycharmProject/Python-Projects/baidutieba/BDTB3.py”, line 149, in < module > bdtb.start() File “E:/python/code/PycharmProject/Python-Projects/baidutieba/BDTB3.py”, line 123, in start pageNum = self.getPageNum(indexPage) File “E:/python/code/PycharmProject/Python-Projects/baidutieba/BDTB3.py”, line 86, in getPageNum result = re.search(pattern,page) File “C:Python27libre.py”, line 146, in search return _compile(pattern, flags).search(string) TypeError: expected string or buffer
