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<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"><meta><title>Yrf's blog</title><link rel="manifest" href="/manifest.json"><meta name="application-name" content="yrf's blog"><meta name="msapplication-TileImage" content="/img/favicon.svg"><meta name="apple-mobile-web-app-capable" content="yes"><meta name="apple-mobile-web-app-title" content="yrf's blog"><meta name="apple-mobile-web-app-status-bar-style" content="default"><meta property="og:type" content="blog"><meta property="og:title" content="Yrf's blog"><meta property="og:url" content="https://twilight218.github.io/"><meta property="og:site_name" content="Yrf's blog"><meta property="og:locale" content="en_US"><meta property="og:image" content="https://twilight218.github.io/img/og_image.png"><meta property="article:author" content="叶润繁"><meta property="twitter:card" content="summary"><meta property="twitter:image" content="/img/og_image.png"><script 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class="link-muted" href="/categories/science/">science</a></span><span class="level-item">15 minutes read (About 2278 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/02/23/Redis%E5%B8%B8%E7%94%A8%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B/">Redis常用数据类型</a></h1><div class="content"><p>Redis是NoSQL型数据库，数据都在内存中，支持持久化，支持多种数据结构的存储，如String、list、set、hash、zset。一般作为缓存数据库辅助持久化的数据库。本篇记录基本概念和操作，关于持久化、主从复制、事务、集群等内容的学习查看官方文档。</p></div><a class="article-more button is-small is-size-7" href="/2022/02/23/Redis%E5%B8%B8%E7%94%A8%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-02-21T01:47:27.000Z" title="2022/2/21 上午9:47:27">2022-02-21</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">22 minutes read (About 3319 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/02/21/Linux%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4/">Linux常用命令</a></h1><div class="content"><p>本篇文章记录常见的Linux命令，以CentOS7.6演示。</p></div><a class="article-more button is-small is-size-7" href="/2022/02/21/Linux%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-02-18T04:46:34.000Z" title="2022/2/18 下午12:46:34">2022-02-18</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">a minute read (About 131 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/02/18/MySQL%E7%B4%A2%E5%BC%95%E4%BC%98%E5%8C%96%E3%80%81%E5%A4%B1%E6%95%88%E5%9C%BA%E6%99%AF%E4%B8%8E%E4%BA%8B%E5%8A%A1/">MySQL索引优化、失效场景与事务</a></h1><div class="content"><p>MySQL的索引设计，索引失效场景，事务等，记录一些学习资料。</p></div><a class="article-more button is-small is-size-7" href="/2022/02/18/MySQL%E7%B4%A2%E5%BC%95%E4%BC%98%E5%8C%96%E3%80%81%E5%A4%B1%E6%95%88%E5%9C%BA%E6%99%AF%E4%B8%8E%E4%BA%8B%E5%8A%A1/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-02-17T08:51:37.000Z" title="2022/2/17 下午4:51:37">2022-02-17</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">12 minutes read (About 1810 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/02/17/MySQL%E7%B4%A2%E5%BC%95/">MySQL索引结构</a></h1><div class="content"><p>索引（Index）是帮助MySQL高效获取数据的数据结构，在InnoDB存储引擎中，默认的索引是B+tree形式的。</p></div><a class="article-more button is-small is-size-7" href="/2022/02/17/MySQL%E7%B4%A2%E5%BC%95/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-02-17T07:10:40.000Z" title="2022/2/17 下午3:10:40">2022-02-17</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">5 minutes read (About 708 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/02/17/MySQL%E9%80%BB%E8%BE%91%E6%9E%B6%E6%9E%84/">MySQL逻辑架构与存储引擎</a></h1><div class="content"><p>SQL语句的执行流程。</p></div><a class="article-more button is-small is-size-7" href="/2022/02/17/MySQL%E9%80%BB%E8%BE%91%E6%9E%B6%E6%9E%84/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-02-08T14:16:44.000Z" title="2022/2/8 下午10:16:44">2022-02-08</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">2 minutes read (About 354 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/02/08/%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86/">动态代理</a></h1><div class="content"><p>基于jdk的动态代理和基于cglib的动态代理实现方式。</p></div><a class="article-more button is-small is-size-7" href="/2022/02/08/%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-01-29T13:15:28.000Z" title="2022/1/29 下午9:15:28">2022-01-29</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">an hour read (About 7050 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/01/29/SpringMVC/">SpringMVC</a></h1><div class="content"><p>SpringMVC是Spring的一个后续产品，是Spring的一个子项目。SpringMVC 是 Spring 为表述层开发提供的一整套完备的解决方案。<strong>基于原生的Servlet</strong>，通过了功能强大的<strong>前端控制器DispatcherServlet</strong>，对请求和响应进行统一处理。</p></div><a class="article-more button is-small is-size-7" href="/2022/01/29/SpringMVC/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-01-23T10:19:43.000Z" title="2022/1/23 下午6:19:43">2022-01-23</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">7 minutes read (About 1067 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/01/23/%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E4%B8%8B%E8%BD%BD%E4%B8%8E%E4%B8%80%E6%AC%A1%E6%80%A7%E9%AA%8C%E8%AF%81%E7%A0%81/">文件上传下载与一次性验证码</a></h1><div class="content"><p>文件上传下载功能十分常见，本篇文章记录一下操作流程。</p></div><a class="article-more button is-small is-size-7" href="/2022/01/23/%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E4%B8%8B%E8%BD%BD%E4%B8%8E%E4%B8%80%E6%AC%A1%E6%80%A7%E9%AA%8C%E8%AF%81%E7%A0%81/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-01-23T09:42:11.000Z" title="2022/1/23 下午5:42:11">2022-01-23</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">5 minutes read (About 733 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/01/23/Filter%E8%BF%87%E6%BB%A4%E5%99%A8/">Filter过滤器</a></h1><div class="content"><p>Filter过滤器是JavaWeb的三大组件之一。它是JavaEE的一个接口，作用是：拦截请求，过滤响应。比较常见的应用场景有：权限检查、日记操作、事务管理等。</p></div><a class="article-more button is-small is-size-7" href="/2022/01/23/Filter%E8%BF%87%E6%BB%A4%E5%99%A8/#more">Read more</a></article></div><div class="card"><article class="card-content article" role="article"><div class="article-meta is-size-7 is-uppercase level is-mobile"><div class="level-left"><span class="level-item">Posted <time dateTime="2022-01-22T14:11:06.000Z" title="2022/1/22 下午10:11:06">2022-01-22</time></span><span class="level-item"><a class="link-muted" href="/categories/science/">science</a></span><span class="level-item">20 minutes read (About 3015 words)</span></div></div><h1 class="title is-3 is-size-4-mobile"><a class="link-muted" href="/2022/01/22/MySQL%E7%BA%A6%E6%9D%9F/">MySQL约束</a></h1><div class="content"><p>为了保证数据的完整性，SQL规范以约束的方式对表数据进行额外的条件限制。</p></div><a class="article-more button is-small is-size-7" href="/2022/01/22/MySQL%E7%BA%A6%E6%9D%9F/#more">Read more</a></article></div><nav class="pagination" role="navigation" aria-label="pagination"><div class="pagination-previous is-invisible is-hidden-mobile"><a href="/page/0/">Previous</a></div><div class="pagination-next"><a href="/page/2/">Next</a></div><ul class="pagination-list is-hidden-mobile"><li><a class="pagination-link is-current" href="/">1</a></li><li><a class="pagination-link" href="/page/2/">2</a></li><li><a class="pagination-link" href="/page/3/">3</a></li></ul></nav></div><div class="column column-left is-4-tablet is-4-desktop is-3-widescreen order-1 is-sticky"><div class="card widget" data-type="profile"><div 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dateTime="2022-02-21T01:47:27.000Z">2022-02-21</time></p><p class="title"><a href="/2022/02/21/Linux%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4/">Linux常用命令</a></p><p class="categories"><a href="/categories/science/">science</a></p></div></article><article class="media"><div class="media-content"><p class="date"><time dateTime="2022-02-18T04:46:34.000Z">2022-02-18</time></p><p class="title"><a href="/2022/02/18/MySQL%E7%B4%A2%E5%BC%95%E4%BC%98%E5%8C%96%E3%80%81%E5%A4%B1%E6%95%88%E5%9C%BA%E6%99%AF%E4%B8%8E%E4%BA%8B%E5%8A%A1/">MySQL索引优化、失效场景与事务</a></p><p class="categories"><a href="/categories/science/">science</a></p></div></article><article class="media"><div class="media-content"><p class="date"><time dateTime="2022-02-17T08:51:37.000Z">2022-02-17</time></p><p class="title"><a href="/2022/02/17/MySQL%E7%B4%A2%E5%BC%95/">MySQL索引结构</a></p><p class="categories"><a href="/categories/science/">science</a></p></div></article><article class="media"><div class="media-content"><p class="date"><time 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