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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">2898</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 class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/13192" title="第四章 Controller接口控制器详解（4）——跟" target="_blank" onclick="return recordId('',)">第四章 Controller接口控制器详解（4）——跟 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13192" 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/13192';}else{window.open('/article/13192');}" style="cursor: pointer;">4.12、ParameterizableViewController参数化视图控制器，不进行功能处理（即静态视图），根据参数的逻辑视图名直接选择需要展示的视图。Java代码<beanname="/parameterizableView"class="org.springframework.web.servlet.mvc.ParameterizableViewController"><propertyname="viewName"value="success</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 22:00:17</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2898</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 class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11008" title="四大美女元宵齐斗艳秦岚王丽坤佟丽娅马苏舞值" target="_blank" onclick="return recordId('',)">四大美女元宵齐斗艳秦岚王丽坤佟丽娅马苏舞值 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11008" 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/11008';}else{window.open('/article/11008');}" style="cursor: pointer;">http://www.tu12138.com/comment/comment.do?method=queryComment&id=15030610280689400001&type=佟丽娅马苏四大美女元宵齐斗艳秦岚王丽坤佟丽娅马苏舞值颜值pk</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 09:29:28</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2898</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/8371" title="Oracle数据库中char()，varchar2()，nvarchar2(" target="_blank" onclick="return recordId('',)">Oracle数据库中char()，varchar2()，nvarchar2( </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8371" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/8371';}else{window.open('/article/8371');}" style="cursor: pointer;">Oracle数据库中char()，varchar2()，nvarchar2()三种数据类型的区别1.char()类型:（1）如果在数据库中定义的长度为10位，而我实际入力的数据长度不足10位，系统会在入力数据的后面用空字符串补足10位。（2）一个全角认作2位长度。2.varchar2()类型：（1）不足数据库规定长度，不会补足长度。（2）一个全角认作2位长度。3.nvarchar2()类型：（1）不足数据库规定长度，不会补足长度。（2）一个全角认作1位长度</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 01:55:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2898</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/8061" title="innodb数据库批量转换表引擎为MyISAM" target="_blank" onclick="return recordId('',)">innodb数据库批量转换表引擎为MyISAM </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8061" 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/8061';}else{window.open('/article/8061');}" style="cursor: pointer;">12345678910111213141516171819202122<?php//连接数据库$host='localhost';$user='mysql_username';//管理账户$passwd='mysql_password';//密码$db='wordpressdb';//数据库名称$link=mysql_connect($host,$user,$passwd);if(!$link){die('Couldnotconnect:'.mysql_e</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 01:54:46</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2898</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/18.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 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