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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">3123</span></span>  </p> </article><article class="excerpt"> <header> <a title="SqlServer" class="label label-important zj-del-target" href="/category/46">SqlServer<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7235" title="JDBC操纵数据库的步骤（以SQLServer为例）" target="_blank" onclick="return recordId('',)">JDBC操纵数据库的步骤（以SQLServer为例） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7235" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/1.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7235';}else{window.open('/article/7235');}" style="cursor: pointer;">JDBC的简介JDBC（JavaDataBaseConnectivity,java数据库连接）是一种用于执行SQL语句的JavaAPI，可以为多种关系数据库提供统一访问，它由一组用Java语言编写的类和接口组成。JDBC为工具/数据库开发人员提供了一个标准的API，据此可以构建更高级的工具和接口，使数据库开发人员能够用纯JavaAPI编写数据库应用程序，操作不同的数据库需要使用不同的JDBC。JDBC编程步骤一、LoadtheDriver加载JDBC驱动程</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 01:53:53</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3123</span></span>  </p> </article><article class="excerpt"> <header> <a title="Linux" class="label label-important zj-del-target" href="/category/53">Linux<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3814" title="为知笔记 Linux客户端下载" target="_blank" onclick="return recordId('',)">为知笔记 Linux客户端下载 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3814" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/3.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/3814';}else{window.open('/article/3814');}" style="cursor: pointer;">为知笔记Linux客户端下载已通过的测试平台：ubuntu11.10i386ubuntu11.10amd64ubuntu10.04i386ubuntu10.04amd641.0beta更新日志：1.附件的添加，删除，打开2.标签的添加，删除3.阅读模式与笔记模式的切换4.皮肤功能，有三种皮肤可供选择5.增加用户选项面板6.增加ubuntu下的程序启动图标尚未实现的功能：1.添加，删除，修改加密笔记Wizforubuntu安装指南下载与平台对应的安装包：bi</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 01:33:29</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3123</span></span>  </p> </article><article class="excerpt"> <header> <a title="各行各业" class="label label-important zj-del-target" href="/category/38">各行各业<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/569" title="ActiveReports 9 新功能：借助目录(TOC)控件为" target="_blank" onclick="return recordId('',)">ActiveReports 9 新功能：借助目录(TOC)控件为 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/569" 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/569';}else{window.open('/article/569');}" style="cursor: pointer;">原文:ActiveReports9新功能：借助目录(TOC)控件为报表添加目录功能在最新发布的ActiveReports9报表控件中添加了多项新功能，以帮助你在更短的时间里创建外观绚丽、功能强大的报表系统，本文将重点介绍新增文档目录控件(TOC)，通过拖拽操作便可添加报表目录。目录控件可以帮助用户快速的导航到位于报表中希望查看的数据。可以使用目录控件内嵌报表主体的内容列表用于打印和导出。不像文档结构图只能在报表浏览器中查看不能导出或者打印。本示例被分解为下</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 01:32:08</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3123</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/28128" title="蒙特卡洛方法以及python实现" target="_blank" onclick="return recordId('',)">蒙特卡洛方法以及python实现 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/28128" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/1.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/28128';}else{window.open('/article/28128');}" style="cursor: pointer;">蒙特卡洛方法以及python实现1.什么是蒙特卡洛方法(MonteCarlomethod)2.蒙特卡洛方法的基本思想3.应用：蒙特卡洛求定积分常见方法3.1投点法：3.2期望法：3.3蒙特卡洛求定积分4.蒙特卡洛方法python实例1.什么是蒙特卡洛方法(MonteCarlomethod)蒙特卡罗方法也称统计模拟方法，是1940年代中期由于科学技术的发展和电子计算机的发明，而提出的一种以概率统计理论为指导的数值计算方法。是指使用随机数（或更常见的伪随机数）</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 17:53:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3122</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i 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