需求：分析从富文本编辑器传递到服务端的HTML源码，从HTML源码里检索形如 <img src="attachment/100" /> 或者 <a href="attachment/101" > ... </a>的标签，替换成为<tn-media  hash = " ... ">的内部标签存入数据库

原方案：使用正则搜索替换上述标签，实际情况上还是比较容易出错的，因此考虑用DOM树节点分析节点代替正则搜索

环境：python2.7 , webpy , BeautifulSoup (DOM分析工具，第三方库)

 

#!/usr/bin/env python # -*- coding: utf-8 -*- import web urls = ( '/', 'index', '/parse','parse' ) web.config.debug = False app = web.application(urls, globals()) class index: def GET(self):         s = '''                           
                                
     
         
       <font color="red">折腾人的中文</font> <p><a href="http://www.baidu.com">baidu百度</a><img src="attachment/19" alt="" data-mce-src="attachment/19"></p><p><a href="attachment/20" data-mce-href="attachment/20"><img src="images/home/attType/unknown.png" alt="" data-mce-src="images/home/attType/unknown.png"></a></p><p><span>Bug.txt--0.31KB<br></span></p><p><a href="attachment/21" data-mce-href="attachment/21"><img src="images/home/attType/unknown.png" alt="" data-mce-src="images/home/attType/unknown.png"></a><br><span>BBS--0.23KB</span></p><p><span> </span></p><p> </p> <p><img src="http://csdnimg.cn/www/images/csdnindex_logo.gif"></p>                         
               
     
                   ''' return s import json from BeautifulSoup import BeautifulSoup class parse: def POST(self):         wi = web.input()         s = wi.s         soup = BeautifulSoup(s)         links = soup.findAll('a')         a = []         a1 = [] for link in links:             a.append(link['href']) if link['href'].find('attachment/') != -1:                 a1.append(link['href'])         s1 ="ALL LINK:
%s
WE NEED LINK:
%s" %(json.dumps(a),json.dumps(a1))         imgs = soup.findAll('img')         imgsAll = []         imgsNeed = [] for img in imgs:             imgsAll.append(img['src']) if img['src'].find('attachment/') != -1:                 imgsNeed.append(img['src'])         s2 ="ALL IMG:
%s
WE NEED IMG:
%s" %(json.dumps(imgsAll),json.dumps(imgsNeed))        return '''
      %s 
 %s 
 %s ''' %(s,s1,s2) if __name__ == "__main__":      app.run()

  

不过因为担心BeautifulSoup不够稳定（字符编码会出错，解析糟糕的HTML标记符出错等因素）所以只采用BeautifulSoup功能的一个子集：让它去检索标签，而不修改DOM树，修改HTML的工作仍然由使用它的程序负责完成

def convertToMedia(self,db,s):    ''' 新版代码 编写执行通过 等待测试 需要安装Soup''' def getDigestOfAttchment(db,attId):         sql = "select digest from Attachment where attId=$attId"         list = db.query(sql,vars=locals()).list() if len(list)>0: return list[0].digest else: return None def convertOtherToMedia(db,links,s): for link in links: #期望的字符串是'/attachment/12' 所以find必然等于0             if link['href'].find('/attachment/') == 0:                 listPartOfHref = link['href'].split('/') #字符串被拆分成['','attachment','12']                 if len(listPartOfHref) != 3: continue if len(listPartOfHref[2]) < 1: continue                 attId = int(listPartOfHref[2])                 digest = getDigestOfAttchment(db,attId) if digest == None : continue                 s = s.replace(str(link),'
     '%digest) return s def convertPictureToMedia(db,images,s): for image in images: #期望的字符串是'/attachment/12' 所以find必然等于0             if image['src'].find('/attachment/') == 0:                 listPartOfSrc = image['src'].split('/') #字符串被拆分成['','attachment','12']                 if len(listPartOfSrc) != 3: continue if len(listPartOfSrc[2]) < 1: continue                 attId = int(listPartOfSrc[2])                 digest = getDigestOfAttchment(db,attId) if digest == None : continue                 s = s.replace(str(image),'
     '%digest) return s    from BeautifulSoup import BeautifulSoup     soup = BeautifulSoup(s)     links = soup.findAll('a')     s = convertOtherToMedia(db,links,s)     images = soup.findAll('img')     s = convertPictureToMedia(db,images,s) return False,s    #提供False是因为原来的实现里外部接口需要函数提供，修改外部代码即可取消

 

BeautifulSoup在DOM树上进行修改的例子

a = soup.findAll('img') for i in a: if i['src'].find('attachment/') > -1:         i.replaceWith('
     
      ')