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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">2943</span></span>  </p> </article><article class="excerpt"> <header> <a title="Oracle" class="label label-important zj-del-target" href="/category/45">Oracle<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8421" title="Oracle很实用的汇总报表实现方式！grouping_id" target="_blank" onclick="return recordId('',)">Oracle很实用的汇总报表实现方式！grouping_id </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8421" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/12.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/8421';}else{window.open('/article/8421');}" style="cursor: pointer;">在财务系统或者其他报表统计的功能里我想类似下面这张报表的case很多，有了grouping_id函数之后会轻松easy实现，不菲催费之力序号项目上年本年增减日均余额成本率日均余额成本率日均余额成本率总计一银行借款1用于商业票据额度国家开发银行2其它授信额度国家开发银行美国银行二集团拆入三总部拆入解析：此表是三级汇总，银行汇总到额度（商业额度、其他额度），各种额度汇总到拆入方式（银行借款、集团拆入、总部拆入）、拆入方式汇总总计。grouping_id可以实现</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 01:55:09</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2943</span></span>  </p> </article><article class="excerpt"> <header> <a title="C#" class="label label-important zj-del-target" href="/category/43">C#<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7361" title="C#中日期函数的样式大全" target="_blank" onclick="return recordId('',)">C#中日期函数的样式大全 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7361" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/20.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7361';}else{window.open('/article/7361');}" style="cursor: pointer;">---------------------------------------------------------------------------------------------------------------------//获取日期+时间DateTime.Now.ToString();//2008-9-420:02:10DateTime.Now.ToLocalTime().ToString();//2008-9-420:12:12//获取日期</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 01:54:04</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2943</span></span>  </p> </article><article class="excerpt"> <header> <a title="Ubuntu" class="label label-important zj-del-target" href="/category/55">Ubuntu<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7084" title="Ubuntu14.04LST 安装Oracle SQL Developer 4.0." target="_blank" onclick="return recordId('',)">Ubuntu14.04LST 安装Oracle SQL Developer 4.0. </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7084" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7084';}else{window.open('/article/7084');}" style="cursor: pointer;">1：OracleSQLDeveloper4.0.2下载链接：http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html2：下载的文件为sqldeveloper-4.0.2.15.21-1.noarch.rpm,rpm安装包不能直接在Ubuntu系统上安装，需要使用alien将rpm转换为deb进行安装。$sudoalien-k--scriptssq</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 01:53:43</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2943</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/6538" title="最长公共子序列LCS" target="_blank" onclick="return recordId('',)">最长公共子序列LCS </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6538" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/11.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/6538';}else{window.open('/article/6538');}" style="cursor: pointer;">//LCS算法，最长公共子序列来自《算法导论》#include<iostream>#include<cstdlib>#include<cmath>#defineN105chars[N+1][N+1];usingnamespacestd;intLCS(constchar*s1,constchar*s2){intm=strlen(s1);intn=strlen(s2);inti,j;s[0][0]=0;for(i=0;i<=m;i++){s[i][0]=0;}</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">2943</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/27196" title="Python实现类似比特币的加密货币区块链的创建与交易实例" target="_blank" onclick="return recordId('',)">Python实现类似比特币的加密货币区块链的创建与交易实例 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/27196" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/6.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/27196';}else{window.open('/article/27196');}" style="cursor: pointer;">虽然有些人认为区块链是一个早晚会出现问题的解决方案，但是毫无疑问，这个创新技术是一个计算机技术上的奇迹。那么，究竟什么是区块链呢？区块链以比特币（Bitcoin）或其它加密货币按时间顺序公开地记录交易的数字账本。更通俗的说，它是一个公开的数据库，新的数据存储在被称之为区块（block）的容器中，并被添加到一个不可变的链（chain）中（因此被称为区块链（blockchain）），之前添加的数据也在该链中。对于比特币或其它加密货币来说，这些数据就是一组组交易</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 17:51:51</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2942</span></span>  </p> </article><article class="excerpt"> <header> <a title="Java" class="label label-important zj-del-target" href="/category/41">Java<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/17957" title="注释向 Java 代码中添加元数据" target="_blank" onclick="return recordId('',)">注释向 Java 代码中添加元数据 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17957" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/17957';}else{window.open('/article/17957');}" style="cursor: pointer;">注释，J2SE5.0(Tiger)中的新功能，将非常需要的元数据工具引入核心Java语言。该系列文章分为两部分，在这第1部分中，作者BrettMcLaughlin解释了元数据如此有用的原因，向您介绍了Java语言中的注释，并研究了Tiger的内置注释。 </p> </article><div class="pagination" 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