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以一种"廉价"的方式获取页面的标题(downmoon)

有朋友问到：“我需要得到一个webpage的title，因为这个title一般都比较靠前，只要取得html的前面少量内容就可以了。因为要取得很多个页面的title,如果下载整个htmlcode，肯定比较浪费时间。.net好像没有现成的类可以干这件事情(取得部分html)，我应该如何去实现？”一种比较"廉价"(即较小成本条件下)的解决思路：第一步：取出含有页面title部分的最小集合。这是“廉价”的关键！第二步：用正则表达式取出和</title</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:21:16</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2872</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7948" title="SIMCom智能设备扫描头接口说明" target="_blank" onclick="return recordId('',)">SIMCom智能设备扫描头接口说明 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7948" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7948';}else{window.open('/article/7948');}" style="cursor: pointer;">DocumentTitle:SIMCom智能设备扫描头接口说明Version:1.01Date:2014-02-13Status:ReleaseDocumentControlID:SIM0005Writer:Yunqi.miao通过程序代码开启扫描通过广播实现，广播名称为:android.intent.action.SIMSCAN举例:context.sendBroadcast(newIntent("android.intent.action.SIMSCA</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:54:39</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2872</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/6549" title="在ContentResolver中使用Group By" target="_blank" onclick="return recordId('',)">在ContentResolver中使用Group By </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6549" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/19.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/6549';}else{window.open('/article/6549');}" style="cursor: pointer;">使用ContentProvider查询短信，希望可以在ContentResolver.query中使用GroupBy，发现系统并没有提供接口或者可用字段。探究竟首先我们来看看query函数：publicfinalCursorquery(Uriuri,String[]projection,Stringselection,String[]selectionArgs,StringsortOrder){returnquery(uri,projection,sele</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:53:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2872</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/1464" title="[SQL]啊?!查询分析器的BUG?!" target="_blank" onclick="return recordId('',)">[SQL]啊?!查询分析器的BUG?! </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1464" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/1464';}else{window.open('/article/1464');}" style="cursor: pointer;">当我们用SQLServer的查询分析器察看一张表时，竟然看到了这样的记录：奇怪之处就在于“ReceiveTime”字段明明是datetime类型，怎么可能是“62016004”这个数字呢？SQLServer怎么会让这种数字插入呢？即使我们的程序写错了，想往记录里插，那也会得到异常的呀？还是做数据仓库的有经验，说可能是查询分析器的BUG。用VBScript写了一个查询的例子，把这条记录的每一个字段报告出来，果然！结论：确实是微软的查询分析器算错了，实际上数据</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:32:32</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2872</span></span>  </p> </article><article class="excerpt"> <header> <a title="Python" class="label label-important zj-del-target" href="/category/44">Python<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/29154" title="Python实现通过解析域名获取ip地址的方法分析" target="_blank" onclick="return recordId('',)">Python实现通过解析域名获取ip地址的方法分析 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/29154" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/29154';}else{window.open('/article/29154');}" style="cursor: pointer;">本文实例讲述了Python实现通过解析域名获取ip地址的方法。分享给大家供大家参考，具体如下：从网上查找的一些资料，特此做个笔记案例1：defgetIP(domain):myaddr=socket.getaddrinfo(domain,'http')print(myaddr[0][4][0])执行函数getIP("www.google.com")案例2：defget_ip_list(domain):#获取域名解析出的IP列表ip_list=[]try:ad</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-09-27 17:54:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2871</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/jsp/1/p/1">首页</a></li> <li class="prev-page"><a 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