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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">2647</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/6069" title="Linq To Sql 中使用lambda表达式实现Left Join" target="_blank" onclick="return recordId('',)">Linq To Sql 中使用lambda表达式实现Left Join </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6069" 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/6069';}else{window.open('/article/6069');}" style="cursor: pointer;">网上也有很多有关LinqToSql实现Leftjoin的例子，不过使用lambda的不多，就算使用lambda的，也讲得很含糊，本来不需要讲太多废话的，硬要讲得高深莫测，显得好厉害。那些高深的东西在这里我也不讲了，也不会讲，直接上代码就知道了：当前有两个表，TUsers与TUserInfo，两者通过UserID关联，而TUsers表记录的是必须的数据，而TUserInfo记录是一些附件的数据，因此在TUserInfo中不一定有数据。使用LeftJoin获取</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 01:52:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2647</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/6016" title="学习Oracle日记（二）" target="_blank" onclick="return recordId('',)">学习Oracle日记（二） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6016" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/14.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/6016';}else{window.open('/article/6016');}" style="cursor: pointer;">＃１.查询语句中使用函数@1.round(d1,d2)用于数字的四舍五入d1表示数字d2表示小数点后的位数（d2不写默认为零）@2.trunc(d1,d2)截取去尾法@3.日期函数sysdateselectsysdatefromdual;----获取系统当前时间@4.日期数据相减，得到两个日期之间的天数差不足一天用小数表示@5.months_between(d1,d2)得到d1,d2两个日期数据之间所差的月份小数表示@6.计算d2个月之前的时间点add_m</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 01:52:38</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2647</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/5496" title="委托事件简写与原来写法 (临时函数)转" target="_blank" onclick="return recordId('',)">委托事件简写与原来写法 (临时函数)转 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/5496" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/14.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/5496';}else{window.open('/article/5496');}" style="cursor: pointer;">publicMainPage(){this.InitializeComponent();//简写this.Loaded+=(sender,e)=>{MessageBox.Show("d");MessageBox.Show("ss");};//原来写法this.Loaded+=newRoutedEventHandler(MainPage_Loaded);}voidMainPage_Loaded(objectsender,RoutedEventArgse){/</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 01:52:04</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2647</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/20114" title="Oracle中IO" target="_blank" onclick="return recordId('',)">Oracle中IO </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20114" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/13.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/20114';}else{window.open('/article/20114');}" style="cursor: pointer;">数据库的作用就是实现对数据的管理和查询。任何一个数据库系统，必然存在对数据的大量读或者写或者两中操作都大量存在。IO问题也往往是导致数据库性能问题的重要原因。在这篇文章中，主要帮助大家在理解Oracle的读写操作机制的基础上，灵活解决遇到的各种常见的IO问题。1Oracle中IO的产生IO当然包括了读、写两部分，先介绍Oracle中写操作的产生。1.1写介绍写操作之前，先简单的看下Oracle的物理结构：oracle的物理文件包括以下三种文件：控制文件（C</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 23:28:27</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2646</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/17958" title="java学习小知识集锦２" target="_blank" onclick="return recordId('',)">java学习小知识集锦２ </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17958" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/17958';}else{window.open('/article/17958');}" style="cursor: pointer;">1.awt中的MouseEvent类中的方法isPopupTrigger()返回此鼠标事件是否为该平台的弹出菜单触发的事件InputEvent中的consume()的作用是以便不会按照默认的方式由产生此事件的源代码处理此事件。2.javax.swing类JToolBar方法setFloatable(booleanb)设置floatable属性，如果要移动工具栏，此属性必须设置为true。3.Set，因为Set不允许包括重复的元素而且排序和我们无关。4.什么</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 23:00:11</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2646</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/14.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">2646</span></span>  </p> </article><article class="excerpt"> <header> <a title="操作系统" class="label label-important zj-del-target" href="/category/34">操作系统<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/4730" title="SZU:A26 Anagram" target="_blank" onclick="return recordId('',)">SZU:A26 Anagram </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/4730" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/10.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/4730';}else{window.open('/article/4730');}" style="cursor: pointer;">JudgeInfoMemoryLimit:32768KBCaseTimeLimit:10000MSTimeLimit:10000MSJudger:NormalDescriptionAnanagramisformedbyrearrangingthelettersofaword.Youaregivenastring,pleasefindoutifitisananagramofawordornot.Nowordwillhavehavemorethan50char</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 01:33:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2646</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/3805" title="贝叶斯网络（Bayesian network)）简介（PRML第8" target="_blank" onclick="return recordId('',)">贝叶斯网络（Bayesian network)）简介（PRML第8 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3805" 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/3805';}else{window.open('/article/3805');}" style="cursor: pointer;">转：http://www.cnblogs.com/Dzhouqi/p/3204353.html部分图为手写，由于本人字很丑，望见谅，只是想把PRML书的一些部分总结出来，给有需要的人看，希望能帮到一些人理解吧。下一篇，我将继续介绍本章内容8.2，条件独立贝叶斯网络（Bayesiannetwork)）简介（PRML第8.1节总结）概率图模型（Graphicalmodels)</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">2646</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/2969" title="文件上传简介1---上传到指定的目录2" target="_blank" onclick="return recordId('',)">文件上传简介1---上传到指定的目录2 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2969" 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/2969';}else{window.open('/article/2969');}" style="cursor: pointer;">本节摘要：上节解决了上传文件到本机指定目录，本节主要是在上节的基础上对前台显示的html页面做一下修改，实现动态的增加文件输入框s。新建upload2.html（放在和upload.html文件的同一个目录下）代码如下：upload2.html1<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">2<html>3<head>4<title>upload2.html56

系统 2019-08-12 01:33:08 2646

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