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2021年 (5篇)</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-95d837d1><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-95d837d1><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-95d837d1><!--[--><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/tools/2021/03/10/Quartz%E5%BF%AB%E9%80%9F%E5%85%A5%E9%97%A8" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>Quartz 快速入门</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/tools/2021/03/06/Postman%E5%BF%AB%E9%80%9F%E5%85%A5%E9%97%A8" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-orange mr-[6px]" style="font-weight: 550; 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display: inline-block;">5</div>初识 Lombok</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-03322d68 data-v-2c336b25><div class="VPDoc has-sidebar has-aside" data-v-2c336b25 data-v-53ed897c><!--[--><!--]--><div class="container" data-v-53ed897c><div class="aside" data-v-53ed897c><div class="aside-curtain" data-v-53ed897c></div><div class="aside-container" data-v-53ed897c><div class="aside-content" data-v-53ed897c><div class="VPDocAside" data-v-53ed897c data-v-3d450548><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-3d450548 data-v-70b38f01><div class="content" data-v-70b38f01><div class="outline-marker" data-v-70b38f01></div><div class="outline-title" role="heading" aria-level="2" data-v-70b38f01>目录</div><nav aria-labelledby="doc-outline-aria-label" data-v-70b38f01><span class="visually-hidden" id="doc-outline-aria-label" data-v-70b38f01> Table of Contents for current page </span><ul class="root" data-v-70b38f01 data-v-e10534d6><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-3d450548></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-53ed897c><div class="content-container" data-v-53ed897c><!--[--><!--]--><!----><main class="main" data-v-53ed897c><div style="position:relative;" class="vp-doc _categories_tools_2021_01_14_%E5%88%9D%E8%AF%86Lombok" data-v-53ed897c><div><h1 id="初识-lombok" tabindex="-1">初识 Lombok <a class="header-anchor" href="#初识-lombok" aria-label="Permalink to "初识 Lombok""></a></h1><!----><h2 id="前言" tabindex="-1">前言 <a class="header-anchor" href="#前言" aria-label="Permalink to "前言""></a></h2><p><strong>C：</strong> 在 Java 开发中，为了符合 <code>封装</code> 这一面向对象特性，在构建 JavaBean 时往往要加上 <code>getter/setter</code> 方法。</p><p>在封装的概念里，<code>getter</code> 和 <code>setter</code> 方法是我们提供给外界的统一访问入口，我们可以在其中添加合理的逻辑控制语句，来处理一些业务或解决一些不合理的赋值，非常好的特性！</p><p>但现代开发的实际使用中，我们编写的 JavaBean 的 <code>getter/setter</code> 方法体都是空的，显得非常冗余，但又不能去除。对此，我们在每次使用时，只能通过反复的心理暗示（IDE 自动生成快捷键、生成不费事儿）来麻痹自己。</p><p>Eclipse 中是 <code>Alt + Shift+S > R</code>，IntelliJ IDEA 中是 <code>[FN] + Alt+Insert > Getter and Setter</code>。</p><p>笔者相信，这些快捷键大家都很熟悉，甚至不只是它们，一般我们还会用上无参构造、带参构造、重写 <code>toString</code>、重写 <code>equals</code> 、<code>hashCode</code> 等生成快捷键，每次创建 JavaBean，写完属性之后就是一通 "火花带闪电" 快速生成，就像下面的代码一样。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 宠物类</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@author</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Charles7c</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * @date 2020-01-14</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 属性声明</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /** 宠物名 */</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name;</span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /** 健康值 */</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> </span></span>
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<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // getter/setter 方法</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getName</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> void</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> setName</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String </span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">name</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.name </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> getHealth</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> void</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> setHealth</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> health</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.health </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> @</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Override</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(Object </span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">o</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">this</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> ==</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> o) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> true</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (o </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> ||</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> getClass</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> o.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getClass</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">()) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> false</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> pet</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (Pet) o;</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> pet.health </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&&</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(pet.name);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> @</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Override</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> hashCode</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Objects.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">hash</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(name, health);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> @</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Override</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">toString</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> "Pet{"</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> "name='"</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> '</span><span style="--shiki-light:#005CC5;--shiki-dark:#F47067;">\'</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> ", health="</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span></span>
|
||
<span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> '}'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> } </span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><p>毫无疑问，天下苦之久矣，于是 Lombok 出现了，旨在通过用简单的语法和注解（Annoation）代替众多的冗余代码，接下来我们就好好认识认识它。</p><p><img src="/assets/202101140900566.GRVNJqY2.jpg" alt="202101140900566"></p><h2 id="概述" tabindex="-1">概述 <a class="header-anchor" href="#概述" aria-label="Permalink to "概述""></a></h2><div class="tip custom-block"><p class="custom-block-title"><a href="https://projectlombok.org/" target="_blank" rel="noreferrer">Lombok</a> 简介</p><p>Project Lombok is a java library that automatically plugs into your editor and build tools, spicing up your java.</p><p>Never write another getter or equals method again, with one annotation your class has a fully featured builder, Automate your logging variables, and much more. [1]</p></div><p>上方是 Lombok 官方的简介，看不懂的同学也没关系，笔者按它实际的体验简单给你介绍下。</p><p>Lombok 是一个 Java 库，这个库提供了很多注解，这些注解会在代码编译的时候，帮助我们自动生成 <code>getter</code> 、<code>setter</code>、<code>equals</code>、<code>hashCode</code> 等等方法，这样我们就可以摆脱曾经的苦恼了。</p><p>使用上它之后，你甚至会觉得在使用一个基于 Java 构建的新编程语言，下面就是 Lombok 优化上述 Pet 类的冗余代码后的效果。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 宠物类</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@author</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Charles7c</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * @date 2020-01-14</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Data</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 属性声明</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /** 宠物名 */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name;</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> /** 健康值 */</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><p>一个 <code>@Data</code> 注解直接可以替代掉那些冗余方法们。怎么样，还不错吧。</p><h2 id="安装" tabindex="-1">安装 <a class="header-anchor" href="#安装" aria-label="Permalink to "安装""></a></h2><h3 id="idea插件安装" tabindex="-1">IDEA插件安装 <a class="header-anchor" href="#idea插件安装" aria-label="Permalink to "IDEA插件安装""></a></h3><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>截止笔者发文时， IntelliJ IDEA 的 2020.3 版本已经发布了，这一版开始，已经预装了 Lombok 插件，意味着你如果用的这版及之后，可以不用看这一小节了。</p></div><p>因为 Lombok 是在项目编译时，根据我们使用的注解，生成我们不想写的冗余代码。 但是 IDE 们可不认识它这一套 "骚操作"，你在 JavaBean 中没写对应的 <code>getter/setter</code> 等方法，那么在 IDE 中写代码时想使用对应 JavaBean 的这些方法就是 "天方夜谭"。</p><p>也就是说如果你在类中没写 <code>getter/setter</code> ，那在 IDE 中编写类时，哪怕已经标注了<code>@Data</code>，也无法让 IDE 提示及使用它们。</p><p>想要在 IDE 中正常使用 Lombok，必须先在 IDE 中安装对应的 Lombok 插件。Lombok 为主流的 IDE 提供了插件支持，我们本次就以 IntelliJ IDEA 为例，来安装下插件，并测试使用效果。</p><p><img src="/assets/202101140900568.6-iC6zPC.png" alt="202101140900568"></p><p>其实 Lombok 官网对各种 IDE 如何安装插件是有教程的（<a href="https://projectlombok.org/setup/intellij" target="_blank" rel="noreferrer">IDEA的教程</a>）。笔者个人认为写得已经很详细了，那接下来笔者就带大家实际操作一遍，你来实现的话记得按我的步骤来。</p><p>首先打开 IDEA，在菜单 <code>File</code> 中找到 <code>Settings</code> 子菜单。</p><p><img src="/assets/202101140900569.cq5x66L3.png" alt="202101140900569"></p><p>在弹出的对话框中，选择 <code>Plugins</code>，然后在 <code>Marketplace</code> 插件市场中输入 <code>lombok</code> 回车搜索，搜索到了点击<code>Install</code> 安装就可以了。</p><p><img src="/assets/202101140900570.kMeoNMKw.png" alt="202101140900570"></p><p>安装成功后，直接点击 <code>Restart IDE</code> 重启 IDEA，插件就安装成功了。</p><p><img src="/assets/202101140900571.uj-hUiC2.png" alt="202101140900571"></p><h3 id="引入依赖" tabindex="-1">引入依赖 <a class="header-anchor" href="#引入依赖" aria-label="Permalink to "引入依赖""></a></h3><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>如果你使用了 Spring Boot，Lombok 的版本已经被 Spring Boot 锁定了，意味着你可以不用指定版本，只需要引入 Lombok 依赖即可。</p></div><p>安装好插件后，就可以在你的项目中引入 Lombok 依赖来使用了。</p><p>Maven 依赖如下：</p><div class="language-xml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">xml</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"><</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">dependency</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> <</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">groupId</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">>org.projectlombok</</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">groupId</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> <</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">artifactId</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">>lombok</</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">artifactId</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> <</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">version</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">>1.18.24</</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">version</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"></</span><span style="--shiki-light:#22863A;--shiki-dark:#8DDB8C;">dependency</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">></span></span></code></pre></div><p>Gradle 依赖如下：</p><div class="language-groovy vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">groovy</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">compile </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">group</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'org.projectlombok'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">name</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'lombok'</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">version</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">: </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">'1.18.24'</span></span></code></pre></div><h2 id="常用注解" tabindex="-1">常用注解 <a class="header-anchor" href="#常用注解" aria-label="Permalink to "常用注解""></a></h2><p>Lombok 的学习使用，就是要学习它的注解们。但的确很多，笔者要是全来一遍，时间花费可不少而且意义不大，所以我们挑一些常见常用的来介绍演示一下就可以了。</p><p>对这些注解的使用，笔者奉行基本应用即可，特殊的类，麻烦的属性，不建议采用，以免"上头"。如果你到时候真的需要，自行搜索一下 <a href="https://projectlombok.org/features/all" target="_blank" rel="noreferrer">官网文档</a> 即可。</p><h3 id="nonnull" tabindex="-1">@NonNull <a class="header-anchor" href="#nonnull" aria-label="Permalink to "@NonNull""></a></h3><p>我们在设值时，经常要进行非空判断，因为为空后再进行处理可能会引发业务错误，<code>@NonNull</code> 注解可以帮助我们简化此类代码。</p><p>它可以用在属性或方法形参上，如果标注的属性/参数为空，则抛出 <code>NPE(NullPointerException)</code>。</p><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>下图中，左侧是我使用 Lombok 的代码，右侧是 <code>mvn compile</code> 之后，从 <code>target</code> 文件夹中查看的反编译后的代码（这些多出来的代码，都是 Lombok 在编译时自动生成的），后续示例笔者不再解释这一点。</p></div><p><img src="/assets/202101140900572.lXZNPP9Y.png" alt="202101140900572"></p><h3 id="getter-setter" tabindex="-1">@Getter/@Setter <a class="header-anchor" href="#getter-setter" aria-label="Permalink to "@Getter/@Setter""></a></h3><p><code>@Getter</code> 和 <code>@Setter</code> 这两个注解，顾名思义就是为我们生成对应的 <code>getter/setter</code> 方法的，一般情况下直接在类上声明就可以了，这样类中所有的非静态私有属性都会生成 <code>public</code> 修饰的 <code>getter/setter</code> 方法了。</p><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>生成的 <code>getter</code> 遵循布尔属性的约定，例如：<code>boolean</code> 类型的 <code>deleted</code> 生成的 <code>getter</code> 方法为 <code>isDeleted</code> 而不是 <code>getDeleted</code>。</p></div><p><img src="/assets/202101140900573.QBOmB1fA.png" alt="202101140900573"></p><p>当然，如果你只是想为部分属性生成对应的 <code>getter/setter</code> 方法，就在属性左侧或上方添加注解即可，它们默认生成的方法都是 <code>public</code> 修饰的。如果你想调整访问级别，可以通过注解内的属性值来进行设置。</p><p><img src="/assets/202101140900575.bAuECzZ8.png" alt="202101140900575"></p><p><code>@Getter</code> 和 <code>@Setter</code> 的确挺好用的，笔者个人比较喜欢使用，诚意推荐。</p><p>还有同学可能担心，如果有一天需要自己在 <code>getter/setter</code> 方法中添加逻辑控制怎么办？不用担心，你直接正常写对应的方法即可，因为 Lombok 检测到你写了之后就不会生成了（这点 "眼力见儿" 还是有的）。</p><h3 id="tostring" tabindex="-1">@ToString <a class="header-anchor" href="#tostring" aria-label="Permalink to "@ToString""></a></h3><p><code>@ToString</code> 就是帮助我们生成非静态属性的 <code>toString</code> 方法的一个注解，它的使用也很简单，一般情况下都是直接在类上面添加即可。</p><p>有些时候我们在 <code>toString</code> 方法中，不想出现某个属性，可以直接在该属性上标注<code>@ToString.Exclude</code> 或采用 <code>@ToString(exclude={"属性名",....)</code> 来排除。</p><p><img src="/assets/202101140900577.F735cngj.png" alt="202101140900577"></p><p>还有，如果你不想 <code>toString</code> 方法输出属性名，那么 <code>includeFieldNames=false</code> 适合你。</p><p><img src="/assets/202101140900579.I-5b_8Kx.png" alt="202101140900579"></p><p>另外如果一个子类想要在 <code>toString</code> 中也输出父类的 <code>toString</code> 内容，那么在 <code>@ToString</code> 内添加 <code>callSuper</code> 属性为 <code>true</code> 即可，但注意父类必须也重写 <code>toString</code>，否则肯定是使用 <code>Object</code> 类默认的 <code>toString</code> 方法返回值了。</p><p><img src="/assets/202101140900581.XXXuBp3y.png" alt="202101140900581"></p><h3 id="构造类注解" tabindex="-1">构造类注解 <a class="header-anchor" href="#构造类注解" aria-label="Permalink to "构造类注解""></a></h3><p>构造方法也是我们经常要生成的代码了，Lombok 提供了三个注解来满足你的各种构造需求。</p><ul><li><code>@NoArgsConstructor</code> 可以自动生成无参数构造方法</li><li><code>@AllArgsConstructor</code> 可以按顺序自动生成所有参数的构造方法</li><li><code>@RequiredArgsConstructor</code> 仅为标注了 <code>@NonNull</code> 注解的属性生成构造方法</li></ul><p>我举一个 <code>@AllArgsConstructor</code> 注解的例子。</p><p><img src="/assets/202101140900583.qlii1KmT.png" alt="202101140900583"></p><h3 id="data" tabindex="-1">@Data <a class="header-anchor" href="#data" aria-label="Permalink to "@Data""></a></h3><p>在上方 Lombok 概述的示例中，我们就看到了 <code>@Data</code> 这个注解，大多数人都喜欢使用此注解。但笔者认为，如果你没有特别需求，仅仅要生成 <code>getter/setter</code> 方法，那使用 <code>@Getter</code> 和 <code>@Setter</code> 就可以了。</p><p>看看下方的示例吧，我仅仅写了一个干干净净的 Pet 类，但是在使用时，它却提示出很多的方法，像 <code>setter</code>、<code>getter</code>、<code>equals</code> 等都提供出来了，显然是 Lombok 的 "锅"，它等价于 <code>@ToString</code>、 <code>@EqualsAndHashCode</code>, <code>@Getter</code>、<code>@Setter</code>、<code>@RequiredArgsConstructor</code> 等注解的集合。</p><p><img src="/assets/202101140900585.__0oxGX-.png" alt="202101140900585"></p><h3 id="cleanup" tabindex="-1">@Cleanup <a class="header-anchor" href="#cleanup" aria-label="Permalink to "@Cleanup""></a></h3><p>我们在使用 IO 系 API 时，需要自行进行资源管理（关流），<code>Java 7</code> 中上线了 <code>try-with-resources</code> 语法来帮助我们实现自动关流，现在 Lombok 也来 "抢活" 了。它提供了一个注解来帮助你自动生成资源管理代码，孰优孰劣自行选择吧。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// Java 7的try-with-resources</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">try</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(InputStream</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> in</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> FileInputStream</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"d:</span><span style="--shiki-light:#005CC5;--shiki-dark:#F47067;">\\</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">a.txt"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)){</span></span>
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||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // ....</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">catch</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (Exception </span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">e</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">){</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> e.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">printStackTrace</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><p><code>@Cleanup</code> 注解使用后及其反编译代码如下。</p><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>因为 Lombok 编译生成的代码涉及到 <code>close()</code> 方法调用，所以需要提前抛出一个 IOException，否则编译会失败。</p></div><p><img src="/assets/202101140900587.os2J-xs1.png" alt="202101140900587"></p><h3 id="synchronized" tabindex="-1">@Synchronized <a class="header-anchor" href="#synchronized" aria-label="Permalink to "@Synchronized""></a></h3><p>为了解决多线程不安全的问题，我们经常使用 <code>synchronized</code> 关键字来进行加锁，可以加在方法上也可以使用代码块来加锁。</p><p><code>@Synchronized</code> 注解的效果和 <code>synchronized</code> 关键字一样，它可以用在类方法或者实例方法上，是<code>synchronized</code> 关键字更安全的变体。</p><p>区别在于锁对象不同，对于类方法和实例方法，<code>synchronized</code> 关键字的锁对象分别是类的 <code>class</code> 对象和 <code>this</code> 对象，而 <code>@Synchronized</code> 的锁对象则分别是私有静态 final 对象 <code>$LOCK</code> 和私有 final 对象 <code>$lock</code>。当然，也可以自己指定锁对象。</p><p><img src="/assets/202101140900589.lsBA9RI2.png" alt="202101140900589"></p><h3 id="builder" tabindex="-1">@Builder <a class="header-anchor" href="#builder" aria-label="Permalink to "@Builder""></a></h3><p><code>@Builder</code> 用在类上，是类似于构建者模式的一个注解。它的作用就是帮你生成一套 <code>builder APIs</code>，将对象构建过程和细节进行封装，更简单和优雅的实现对象的创建及赋值。我们看个对象创建的对比例子吧。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 不使用 @Builder 注解 常见的创建对象方式</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> pet</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">pet.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setName</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"小白"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">pet.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">setHealth</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">100</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
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||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// ......</span></span>
|
||
<span class="line"></span>
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||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 使用@Builder注解后 创建对象</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 在IDEA中，你直接一路敲下来就可以了 链式编程简直不要太舒服</span></span>
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||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> pet1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Pet.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">builder</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">()</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> .</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">name</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"小白"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> .</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">health</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">100</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> .</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">build</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span></code></pre></div><p>那么 <code>@Builder</code> 注解实际帮助我们添加了什么代码呢？看看反编译后的内容吧。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name;</span></span>
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||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health;</span></span>
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||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 1.一个构造</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String </span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">name</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> health</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.name </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name;</span></span>
|
||
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.health </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health;</span></span>
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||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 2.一个静态构建方法 返回构建类对象</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Pet.PetBuilder </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">builder</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Pet.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">PetBuilder</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 3.一个静态内部构建类</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> PetBuilder</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
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||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name;</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> private</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health;</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> PetBuilder</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 4.属性同名赋值方法 </span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 【调用完还会返回构建对象，这样可以继续调用其他方法】</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Pet.PetBuilder </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">name</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String </span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">name</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.name </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> name;</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Pet.PetBuilder </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">health</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> health</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.health </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health;</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 5.最终构建对象方法</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Pet </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">build</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.name, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.health);</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 6.一个toString</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> String </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">toString</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> "Pet.PetBuilder(name="</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.name </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> ", health="</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">.health </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> ")"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><h3 id="日志类注解" tabindex="-1">日志类注解 <a class="header-anchor" href="#日志类注解" aria-label="Permalink to "日志类注解""></a></h3><p>在开发中，我们常常要使用 log 来记录程序执行过程，Lombok 为我们提供了6种注解，根据不同的注解将生成不同类型的 log 实例，但是实例名称都是 <code>log</code>。</p><ul><li><code>@CommonsLog</code></li><li><code>@Log</code></li><li><code>@Log4j</code></li><li><code>@Log4j2</code></li><li><strong><code>@Slf4j(推荐)</code></strong></li><li><code>@XSlf4j</code></li></ul><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Slf4j</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Controller</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">RequestMapping</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"/user"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> UserController</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> @</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">GetMapping</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Result </span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">findAll</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 直接使用 log 实例</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> log.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">info</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">"用户列表查询"</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">); </span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>SLF4J（Simple Logging Facade For Java，为 Java 提供的简单日志门面）。在阿里巴巴 Java 开发手册日志规约中强调，如果要使用日志 API ，必须使用日志门面 API 而不是具体日志框架的 API。</p><p><img src="/assets/202101140900591.BVGjVcj4.png" alt="202101140900591"></p><p>所谓日志门面，其实就是类似于 Java 的 JDBC 一样的一套 API ，有了 JDBC，你无需关心未来切换成哪种关系型数据库，因为获取连接等方法用的是 JDBC 的 API 。</p><p>同样日志门面，可以让我们无需关心未来切换哪种日志框架，因为获取日志实例用的是日志门面的 API。</p></div><h2 id="java-14-新特性-records" tabindex="-1">Java 14 新特性 Records <a class="header-anchor" href="#java-14-新特性-records" aria-label="Permalink to "Java 14 新特性 Records""></a></h2><p>2020年3月17日，Java 14 正式 <code>GA</code>，虽然我们目前仍然主要使用 Java 8，但更新肯定是趋势，未来升级到 14 或更高的某个版本只是时间问题，所以这些新特性我们还是应该关注关注的。</p><p>在 Java 14 中有一个预览特性 <code>Records</code>，Java 15 对该特性又进行了二次预览，<code>Records</code> 提供了一种紧凑的语法来声明类（我们经常用来做类声明的方式有 <code>class</code>、<code>enum</code> 等，这回又多一个），以帮助开发者写出更简洁的代码。</p><p>该特性主要用在特定领域的类，这些类主要用于保存数据，不提供领域行为。再通俗的讲就是我们可以给一些简单的，一般不提供业务操作的类（<code>POJO类</code>等）更改下声明类的方法了。更多详情请查看：<a href="https://openjdk.java.net/jeps/359" target="_blank" rel="noreferrer">Records的官方介绍</a></p><p><img src="/assets/202101140900593.LPTwLgzx.png" alt="202101140900593"></p><p>来个简单的语法示例吧？看看下面的代码，它也自动解决了头疼的 <code>getter</code>、<code>setter</code>、<code>equals</code>、<code>hashCode</code>、无参构造等。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// record 声明类语法</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">{ClassModifier} record TypeIdentifier [TypeParameters] </span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (RecordComponents) [SuperInterfaces] [RecordBody]</span></span>
|
||
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 示例代码：注意这是类，不是方法</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> record</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> Pet</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(String name,</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> health){</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> </span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><h2 id="参考资料" tabindex="-1">参考资料 <a class="header-anchor" href="#参考资料" aria-label="Permalink to "参考资料""></a></h2><p>[1]Project Lombok 简介：<a href="https://projectlombok.org" target="_blank" rel="noreferrer">https://projectlombok.org</a></p><p>[2]Lombok常用注解：<a href="https://www.cnblogs.com/mayhh/p/10113169.html" target="_blank" rel="noreferrer">https://www.cnblogs.com/mayhh/p/10113169.html</a></p><p>[3]Records介绍：<a href="https://openjdk.java.net/jeps/359" target="_blank" rel="noreferrer">https://openjdk.java.net/jeps/359</a></p><h2 id="后记" tabindex="-1">后记 <a class="header-anchor" href="#后记" aria-label="Permalink to "后记""></a></h2><p>Lombok 入门到这里也就介绍完了，感觉怎么样？这只是个入门示例，如果想再多研究研究其他注解和属性，那需要更多的篇幅和时间。</p><p>实际上，在现在的业内，Lombok 的使用存在着争议，有些人认为它是 <code>开发利器</code>，有些人 <code>避之不及</code>。认为它好的是因为它的确减少了大量的冗余代码，相当于写代码随时带个生成器，阅读代码也变得更加清晰直观；认为它不好的是因为它的使用还需要安装额外的插件，且是侵入性的设计（有些人认为，它这种改变语法的事应该是语言本身自己该做的，它 "越俎代庖" 了），如果开发中 IDEA、JDK、Lombok 不配套，那结果显而易见；还有些人认为它影响了业务控制代码的添加和阅读。</p><p>孰是孰非，仁者见仁智者见智。笔者个人觉得，自己平时练习和测试都可以随便用用，如果上升到公司，还是应该以实际和团队整体出发。</p><p><img src="/assets/202101140900595.19mfgMD7.png" alt="202101140900595"></p><p><img src="/assets/202101140900597.LaHmCPti.png" alt="202101140900597"></p><div class="info custom-block"><p class="custom-block-title">笔者说</p><p>对于技术的学习，笔者一贯遵循的步骤是：先用最最简单的 demo 让它跑起来，然后学学它的最最常用 API 和 配置让自己能用起来，最后熟练使用的基础上，在空闲时尝试阅读它的源码让自己能够洞彻它的运行机制，部分问题出现的原因，同时借鉴这些技术实现来提升自己的代码高度。</p><p>所以在笔者的文章中，前期基本都是小白文，仅仅穿插很少量的源码研究。当然等小白文更新多了，你们还依然喜欢，后期会不定时专门对部分技术的源码进行解析。</p></div></div></div></main><footer class="VPDocFooter" data-v-53ed897c data-v-f3af8004><!--[--><!--[--><!--[--><!--[--><!----><!--]--><!--]--><!--]--><!--]--><div class="edit-info" data-v-f3af8004><div class="edit-link" data-v-f3af8004><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/Charles7c/charles7c.github.io/edit/main/docs/categories/tools/2021/01/14/初识Lombok.md" target="_blank" rel="noreferrer" data-v-f3af8004><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-f3af8004><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> 不妥之处，敬请雅正<!--]--></a></div><div class="last-updated" data-v-f3af8004><p class="VPLastUpdated" data-v-f3af8004 data-v-a25eb6f3>最后更新: <time datetime="2022-11-04T07:01:48.000Z" data-v-a25eb6f3></time></p></div></div><nav class="prev-next" data-v-f3af8004><div class="pager" data-v-f3af8004><a class="VPLink link pager-link prev" href="/categories/tools/2021/02/22/RDM%E5%BF%AB%E9%80%9F%E5%85%A5%E9%97%A8" data-v-f3af8004><!--[--><span class="desc" data-v-f3af8004>上一篇</span><span class="title" data-v-f3af8004><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">4</div>Redis Desktop Manager 快速入门</span><!--]--></a></div><div class="pager" data-v-f3af8004><!----></div></nav></footer><!--[--><!--[--><!--[--><div id="comment-container"></div><!--]--><!--]--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
|
||
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display: inline-block;\\\">1</div>个人常用快捷键\",\"link\":\"/categories/fragments/2022/10/06/个人常用快捷键\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>个人常用 Git 命令\",\"link\":\"/categories/fragments/2022/10/05/个人常用Git命令\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>个人常用 Docker 命令\",\"link\":\"/categories/fragments/2022/10/01/个人常用Docker命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>个人常用 SQL 函数\",\"link\":\"/categories/fragments/2022/02/16/个人常用SQL函数\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>个人常用 Linux 命令\",\"link\":\"/categories/fragments/2019/12/31/个人常用Linux命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>个人常用 Hutool 工具类\",\"link\":\"/categories/fragments/2019/12/30/个人常用Hutool工具类\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>个人常用 Stream 使用技巧\",\"link\":\"/categories/fragments/2019/12/29/个人常用Stream使用技巧\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>个人 SQL 优化技巧\",\"link\":\"/categories/fragments/2019/12/28/个人SQL优化技巧\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/rabbit.svg\\\" title=\\\"兔年\\\" alt=\\\"生肖\\\">\\n 2023年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>一文详解限流接口实现\",\"link\":\"/categories/fragments/2023/12/21/一文详解限流接口实现\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>阿里巴巴的Code Review方法论与实践总结\",\"link\":\"/categories/fragments/2023/01/06/CodeReview方法论与实践总结\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/tiger.svg\\\" title=\\\"虎年\\\" alt=\\\"生肖\\\">\\n 2022年 (15篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>简单聊聊如何让网站开启灰色显示\",\"link\":\"/categories/fragments/2022/12/07/网站开启灰色显示\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>使用 IntelliJ IDEA 进行远程程序调试\",\"link\":\"/categories/fragments/2022/11/01/使用IDEA进行远程程序调试\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>CentOS 安装 Docker、Docker Compose\",\"link\":\"/categories/fragments/2022/10/31/CentOS安装Docker\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>Docker 安装 MinIO 详细步骤\",\"link\":\"/categories/fragments/2022/10/28/Docker安装MinIO\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>Docker 安装 Consul 详细步骤\",\"link\":\"/categories/fragments/2022/10/27/Docker安装Consul\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>Docker 安装 OpenLDAP 详细步骤\",\"link\":\"/categories/fragments/2022/10/26/Docker安装OpenLDAP\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>个人常用快捷键\",\"link\":\"/categories/fragments/2022/10/06/个人常用快捷键\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>个人常用 Git 命令\",\"link\":\"/categories/fragments/2022/10/05/个人常用Git命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">9</div>个人常用 Docker 命令\",\"link\":\"/categories/fragments/2022/10/01/个人常用Docker命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">10</div>内网CentOS服务器设置网络代理\",\"link\":\"/categories/fragments/2022/08/29/内网CentOS服务器设置网络代理\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">11</div>为指定Git仓库单独配置用户名和邮箱\",\"link\":\"/categories/fragments/2022/03/28/为指定Git仓库单独配置用户名和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">12</div>修改Git所有提交记录中的作者和邮箱\",\"link\":\"/categories/fragments/2022/03/27/修改Git所有提交记录中的作者和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">13</div>修改Git最后一次提交记录的作者和邮箱\",\"link\":\"/categories/fragments/2022/03/26/修改Git最后一次提交记录的作者和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">14</div>合并两个Git仓库的历史提交记录\",\"link\":\"/categories/fragments/2022/03/25/合并两个Git仓库的历史提交记录\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">15</div>个人常用 SQL 函数\",\"link\":\"/categories/fragments/2022/02/16/个人常用SQL函数\"}],\"collapsed\":true},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>设计模式之单例模式\",\"link\":\"/categories/fragments/2021/05/29/设计模式之单例模式\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>精密计算工具类-BigDecimal\",\"link\":\"/categories/fragments/2021/03/12/精密计算工具类-BigDecimal\"}],\"collapsed\":true},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/pig.svg\\\" title=\\\"猪年\\\" alt=\\\"生肖\\\">\\n 2019年 (4篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>个人常用 Linux 命令\",\"link\":\"/categories/fragments/2019/12/31/个人常用Linux命令\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>个人常用 Hutool 工具类\",\"link\":\"/categories/fragments/2019/12/30/个人常用Hutool工具类\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>个人常用 Stream 使用技巧\",\"link\":\"/categories/fragments/2019/12/29/个人常用Stream使用技巧\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>个人 SQL 优化技巧\",\"link\":\"/categories/fragments/2019/12/28/个人SQL优化技巧\"}],\"collapsed\":true}],\"/categories/solutions/\":[{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/tiger.svg\\\" title=\\\"虎年\\\" alt=\\\"生肖\\\">\\n 2022年 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>递归查询树型结构数据的性能优化方案\",\"link\":\"/categories/solutions/2022/09/07/递归查询树型结构数据的性能优化方案\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>一条SQL查询今年每月统计信息\",\"link\":\"/categories/solutions/2021/11/22/一条SQL查询今年每月统计信息\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>用Java8获取近N天日期\",\"link\":\"/categories/solutions/2021/11/18/用Java8获取近N天日期\"}],\"collapsed\":true}],\"/categories/tools/\":[{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (5篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>Quartz 快速入门\",\"link\":\"/categories/tools/2021/03/10/Quartz快速入门\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>Postman 快速入门\",\"link\":\"/categories/tools/2021/03/06/Postman快速入门\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>Another Redis Desktop Manager 快速入门\",\"link\":\"/categories/tools/2021/03/04/ARDM快速入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>Redis Desktop Manager 快速入门\",\"link\":\"/categories/tools/2021/02/22/RDM快速入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>初识 Lombok\",\"link\":\"/categories/tools/2021/01/14/初识Lombok\"}],\"collapsed\":false}],\"/courses/java/\":[{\"text\":\"Java语法入门 (14篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>开发环境搭建\",\"link\":\"/courses/java/01-Java语法入门/01-开发环境搭建\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>第一个Java程序\",\"link\":\"/courses/java/01-Java语法入门/02-第一个Java程序\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>初识Eclipse\",\"link\":\"/courses/java/01-Java语法入门/03-初识Eclipse\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>程序和计算机的那点事儿\",\"link\":\"/courses/java/01-Java语法入门/04-程序和计算机的那点事儿\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>变量和常量\",\"link\":\"/courses/java/01-Java语法入门/05-变量和常量\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>常用的运算符\",\"link\":\"/courses/java/01-Java语法入门/06-常用的运算符\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>控制语句和流程图\",\"link\":\"/courses/java/01-Java语法入门/07-控制语句和流程图\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>if选择结构\",\"link\":\"/courses/java/01-Java语法入门/08-if选择结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">9</div>switch选择结构\",\"link\":\"/courses/java/01-Java语法入门/09-switch选择结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">10</div>循环结构\",\"link\":\"/courses/java/01-Java语法入门/10-循环结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">11</div>多重循环\",\"link\":\"/courses/java/01-Java语法入门/11-多重循环\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">12</div>程序调试入门\",\"link\":\"/courses/java/01-Java语法入门/12-程序调试入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">13</div>一维数组\",\"link\":\"/courses/java/01-Java语法入门/13-一维数组\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">14</div>多维数组\",\"link\":\"/courses/java/01-Java语法入门/14-多维数组\"}],\"collapsed\":false},{\"text\":\"Java面向对象 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>类和对象\",\"link\":\"/courses/java/02-Java面向对象/01-类和对象\"}],\"collapsed\":true},{\"text\":\"Java高级特性 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>集合与泛型-1\",\"link\":\"/courses/java/03-Java高级特性/01-集合与泛型-1\"}],\"collapsed\":true},{\"text\":\"附录 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>CentOS 8.2 安装 JDK 1.8.0_202\",\"link\":\"/courses/java/04-附录/01-CentOS安装JDK\"}],\"collapsed\":true}],\"/courses/mysql/\":[{\"text\":\"MySQL基础 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>MySQL安装与配置\",\"link\":\"/courses/mysql/01-MySQL基础/01-MySQL安装与配置\"}],\"collapsed\":true},{\"text\":\"附录 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>CentOS 8.2 安装 MySQL 5.7.39\",\"link\":\"/courses/mysql/03-附录/01-CentOS安装MySQL\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>Docker 安装 MySQL 详细步骤\",\"link\":\"/courses/mysql/03-附录/02-Docker安装MySQL\"}],\"collapsed\":false}],\"/courses/mybatis/\":[{\"text\":\"MyBatis基础 (8篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>快速入门\",\"link\":\"/courses/mybatis/01-MyBatis基础/01-快速入门\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>核心对象\",\"link\":\"/courses/mybatis/01-MyBatis基础/02-核心对象\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>核心配置文件\",\"link\":\"/courses/mybatis/01-MyBatis基础/03-核心配置文件\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>SQL映射文件之查询元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/04-SQL映射文件之查询元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>SQL映射文件之增删改元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/05-SQL映射文件之增删改元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>SQL映射文件之自定义映射元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/06-SQL映射文件之自定义映射元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>SQL映射文件之缓存元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/07-SQL映射文件之缓存元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>动态SQL\",\"link\":\"/courses/mybatis/01-MyBatis基础/08-动态SQL\"}],\"collapsed\":false},{\"text\":\"MyBatis-Plus基础 (5篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; 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