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Posted to commits@servicecomb.apache.org by ni...@apache.org on 2017/12/12 09:18:33 UTC
[36/57] [partial] incubator-servicecomb-website git commit: Generated
the static pages for asf-site
http://git-wip-us.apache.org/repos/asf/incubator-servicecomb-website/blob/08e1b43f/content/cn/docs/quick-start-bmi/index.html
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+ <meta itemprop="headline" content="体质指数微服务应用快速开发">
+ <meta itemprop="description" content="以体质指数应用为例介绍如何基于Java Chassis快速开发微服务应用">
+
+ <meta itemprop="dateModified" content="September 04, 2017">
+
+ <div class="page__inner-wrap">
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+ <header>
+ <h1 class="page__title" itemprop="headline">体质指数微服务应用快速开发
+</h1>
+
+ </header>
+
+
+
+ <section class="page__content" itemprop="text">
+ <aside class="sidebar__right">
+<nav class="toc">
+ <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> 在本页上</h4></header> -->
+<ul class="toc__menu" id="markdown-toc">
+ <li><a href="#前言" id="markdown-toc-前言">前言</a></li>
+ <li><a href="#快速开发微服务应用" id="markdown-toc-快速开发微服务应用">快速开发微服务应用</a> <ul>
+ <li><a href="#体质指数计算器实现" id="markdown-toc-体质指数计算器实现">体质指数计算器实现</a></li>
+ <li><a href="#体质指数界面实现" id="markdown-toc-体质指数界面实现">体质指数界面实现</a></li>
+ </ul>
+ </li>
+ <li><a href="#下一步" id="markdown-toc-下一步">下一步</a></li>
+</ul>
+
+ </nav>
+</aside>
+
+<h2 id="前言">前言</h2>
+<p>在您进一步阅读之前，请确保您已阅读了<a href="/cn/docs/quick-start/">快速入门指南</a>，并已成功运行<strong>体质指数</strong>微服务。接下来将进入<strong>体质指数</strong>微服务应用的开发之旅。</p>
+
+<h2 id="快速开发微服务应用">快速开发微服务应用</h2>
+<p>在<a href="/cn/docs/quick-start/">快速入门指南</a>中已对<strong>体质指数</strong>微服务的架构进行了说明，其主要由两个微服务组成：</p>
+
+<ul>
+ <li>
+ <p><strong>体质指数计算器</strong>：负责处理运算事务。</p>
+ </li>
+ <li>
+ <p><strong>体质指数界面</strong>：提供用户界面及网关服务。</p>
+ </li>
+</ul>
+
+<p>下面将对这两个微服务的实现进行介绍，其代码已托管于<a href="https://github.com/ServiceComb/ServiceComb-Java-Chassis/tree/master/samples/bmi">github</a>上。</p>
+<h3 id="体质指数计算器实现">体质指数计算器实现</h3>
+<p>体质指数计算器提供运算服务，其实现分为三部分：</p>
+
+<ul>
+ <li>
+ <p>具体运算实现</p>
+ </li>
+ <li>
+ <p>服务端点定义</p>
+ </li>
+ <li>
+ <p>服务启动入口</p>
+ </li>
+</ul>
+
+<h4 id="具体运算实现">具体运算实现</h4>
+<p>本模块负责计算体质指数，根据公式 \(体质指数=\frac{体重}{身高^2}\) 进行实现，代码如下：</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">CalculatorService</span> <span class="o">{</span>
+ <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">);</span>
+<span class="o">}</span>
+
+<span class="nd">@Service</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">CalculatorServiceImpl</span> <span class="kd">implements</span> <span class="n">CalculatorService</span> <span class="o">{</span>
+ <span class="nd">@Override</span>
+ <span class="kd">public</span> <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">)</span> <span class="o">{</span>
+ <span class="k">if</span> <span class="o">(</span><span class="n">height</span> <span class="o"><=</span> <span class="mi">0</span> <span class="o">||</span> <span class="n">weight</span> <span class="o"><=</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span>
+ <span class="k">throw</span> <span class="k">new</span> <span class="nf">IllegalArgumentException</span><span class="o">(</span><span class="s">"Arguments must be above 0"</span><span class="o">);</span>
+ <span class="o">}</span>
+ <span class="kt">double</span> <span class="n">heightInMeter</span> <span class="o">=</span> <span class="n">height</span> <span class="o">/</span> <span class="mi">100</span><span class="o">;</span>
+ <span class="k">return</span> <span class="n">weight</span> <span class="o">/</span> <span class="o">(</span><span class="n">heightInMeter</span> <span class="o">*</span> <span class="n">heightInMeter</span><span class="o">);</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<h4 id="服务端点定义">服务端点定义</h4>
+<p>服务端点用于生成服务契约，使得服务间能无缝进行通信。首先定义端点接口：</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">CalculatorEndpoint</span> <span class="o">{</span>
+ <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">);</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+<p>引入 <strong>ServiceComb</strong> 依赖：</p>
+<div class="language-xml highlighter-rouge"><pre class="highlight"><code> <span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>spring-boot-starter-provider<span class="nt"></artifactId></span>
+ <span class="nt"></dependency></span>
+</code></pre>
+</div>
+<p>暴露运算服务的Restful端点：</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@RestSchema</span><span class="o">(</span><span class="n">schemaId</span> <span class="o">=</span> <span class="s">"calculatorRestEndpoint"</span><span class="o">)</span>
+<span class="nd">@RequestMapping</span><span class="o">(</span><span class="s">"/"</span><span class="o">)</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">CalculatorRestEndpoint</span> <span class="kd">implements</span> <span class="n">CalculatorEndpoint</span> <span class="o">{</span>
+
+ <span class="kd">private</span> <span class="kd">final</span> <span class="n">CalculatorService</span> <span class="n">calculatorService</span><span class="o">;</span>
+
+ <span class="nd">@Autowired</span>
+ <span class="kd">public</span> <span class="nf">CalculatorRestEndpoint</span><span class="o">(</span><span class="n">CalculatorService</span> <span class="n">calculatorService</span><span class="o">)</span> <span class="o">{</span>
+ <span class="k">this</span><span class="o">.</span><span class="na">calculatorService</span> <span class="o">=</span> <span class="n">calculatorService</span><span class="o">;</span>
+ <span class="o">}</span>
+
+ <span class="nd">@Override</span>
+ <span class="nd">@GetMapping</span><span class="o">(</span><span class="s">"/bmi"</span><span class="o">)</span>
+ <span class="kd">public</span> <span class="kt">double</span> <span class="nf">calculate</span><span class="o">(</span><span class="kt">double</span> <span class="n">height</span><span class="o">,</span> <span class="kt">double</span> <span class="n">weight</span><span class="o">)</span> <span class="o">{</span>
+ <span class="k">return</span> <span class="n">calculatorService</span><span class="o">.</span><span class="na">calculate</span><span class="o">(</span><span class="n">height</span><span class="o">,</span> <span class="n">weight</span><span class="o">);</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<p class="notice--info">ServiceComb从0.3.0版本之后提供了对SpringMvc中简化注解(即<code class="highlighter-rouge">GetMapping</code>等)的支持。</p>
+
+<p>这里用<code class="highlighter-rouge">@RestSchema</code>注释端点后， <strong>ServiceComb</strong> 微服务框架会自动生成对应的服务端点契约，并根据
+如下的 <code class="highlighter-rouge">microservice.yaml</code> 文件中的定义来配置端点端口，将契约和服务一起注册到服务注册中心。</p>
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">APPLICATION_ID</span><span class="pi">:</span> <span class="s">bmi</span>
+<span class="s">service_description</span><span class="pi">:</span>
+ <span class="s">name</span><span class="pi">:</span> <span class="s">calculator</span>
+ <span class="s">version</span><span class="pi">:</span> <span class="s">0.0.1</span>
+<span class="s">cse</span><span class="pi">:</span>
+ <span class="s">service</span><span class="pi">:</span>
+ <span class="s">registry</span><span class="pi">:</span>
+ <span class="s">address</span><span class="pi">:</span> <span class="s">http://127.0.0.1:30100</span>
+ <span class="s">rest</span><span class="pi">:</span>
+ <span class="s">address</span><span class="pi">:</span> <span class="s">0.0.0.0:7777</span>
+</code></pre>
+</div>
+
+<h4 id="服务启动入口">服务启动入口</h4>
+<p>服务启动入口中只需添加 <code class="highlighter-rouge">@EnableServiceComb</code> 的注解即可启用 <em>ServiceComb</em> 微服务框架，代码如下：</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@SpringBootApplication</span>
+<span class="nd">@EnableServiceComb</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">CalculatorApplication</span> <span class="o">{</span>
+ <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span>
+ <span class="n">SpringApplication</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="n">CalculatorApplication</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="n">args</span><span class="o">);</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<h3 id="体质指数界面实现">体质指数界面实现</h3>
+<p>本模块负责提供用户界面及网关服务。其实现主要分为三部分：</p>
+
+<ul>
+ <li>
+ <p>前端界面</p>
+ </li>
+ <li>
+ <p>网关及路由规则</p>
+ </li>
+ <li>
+ <p>服务启动入口</p>
+ </li>
+</ul>
+
+<p>其中，前端界面的组件使用了<a href="http://getbootstrap.com/">Bootstrap</a>来开发。</p>
+
+<h4 id="网关及路由规则">网关及路由规则</h4>
+<p>网关服务主要用到了业界有名的<a href="https://github.com/Netflix/zuul/wiki">Netflix Zuul</a>来实现。</p>
+
+<p>引入依赖：</p>
+<div class="language-xml highlighter-rouge"><pre class="highlight"><code> <span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>spring-boot-starter-discovery<span class="nt"></artifactId></span>
+ <span class="nt"></dependency></span>
+ <span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>spring-boot-starter-servicecomb<span class="nt"></artifactId></span>
+ <span class="nt"></dependency></span>
+ <span class="nt"><dependency></span>
+ <span class="nt"><groupId></span>io.servicecomb<span class="nt"></groupId></span>
+ <span class="nt"><artifactId></span>spring-cloud-zuul<span class="nt"></artifactId></span>
+ <span class="nt"></dependency></span>
+</code></pre>
+</div>
+
+<p class="notice--info">ServiceComb从0.4.0-SNAPSHOT版本之后新增了<code class="highlighter-rouge">spring-cloud-zuul</code>模块使能提供对zuul的兼容。</p>
+
+<p>在 <code class="highlighter-rouge">application.yaml</code> 文件中配置路由规则及服务端口信息：</p>
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">zuul</span><span class="pi">:</span>
+ <span class="s">routes</span><span class="pi">:</span>
+ <span class="s">calculator</span><span class="pi">:</span> <span class="s">/calculator/**</span>
+
+<span class="c1"># disable netflix eurkea since it's not used for service discovery</span>
+<span class="s">ribbon</span><span class="pi">:</span>
+ <span class="s">eureka</span><span class="pi">:</span>
+ <span class="s">enabled</span><span class="pi">:</span> <span class="s">false</span>
+
+<span class="s">server</span><span class="pi">:</span>
+ <span class="s">port</span><span class="pi">:</span> <span class="s">8889</span>
+</code></pre>
+</div>
+<p>在 <code class="highlighter-rouge">microservice.yaml</code> 文件中配置网关服务的信息和服务注册中心的地址。</p>
+<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="s">APPLICATION_ID</span><span class="pi">:</span> <span class="s">bmi</span>
+<span class="s">service_description</span><span class="pi">:</span>
+ <span class="s">name</span><span class="pi">:</span> <span class="s">gateway</span>
+ <span class="s">version</span><span class="pi">:</span> <span class="s">0.0.1</span>
+<span class="s">cse</span><span class="pi">:</span>
+ <span class="s">service</span><span class="pi">:</span>
+ <span class="s">registry</span><span class="pi">:</span>
+ <span class="s">address</span><span class="pi">:</span> <span class="s">http://127.0.0.1:30100</span>
+</code></pre>
+</div>
+<p>此处将服务注册中心和Zuul相结合使能服务发现。</p>
+
+<h4 id="服务启动入口-1">服务启动入口</h4>
+<p>服务启动入口也只需要声明启用 <code class="highlighter-rouge">ServiceComb</code> 和 <code class="highlighter-rouge">Zuul</code> 即可。</p>
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="nd">@SpringBootApplication</span>
+<span class="nd">@EnableZuulProxy</span>
+<span class="nd">@EnableServiceComb</span>
+<span class="kd">public</span> <span class="kd">class</span> <span class="nc">GatewayApplication</span> <span class="o">{</span>
+ <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span>
+ <span class="n">SpringApplication</span><span class="o">.</span><span class="na">run</span><span class="o">(</span><span class="n">GatewayApplication</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="n">args</span><span class="o">);</span>
+ <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<p>至此，<strong>体质指数</strong>应用已开发完毕，您可以通过<a href="/cn/docs/quick-start/#运行微服务应用">快速入门指南</a>中的步骤对其进行验证。</p>
+
+<h2 id="下一步">下一步</h2>
+
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