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| <h1 class="page__title" itemprop="headline">用SpringMVC开发微服务 |
| </h1> |
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| <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> 在本页上</h4></header> --> |
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| <li><a href="#概念阐述" id="markdown-toc-概念阐述">概念阐述</a></li> |
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| <h2 id="概念阐述">概念阐述</h2> |
| |
| <p>ServiceComb支持SpringMVC注解,允许使用SpringMVC风格开发微服务。</p> |
| |
| <h2 id="开发示例">开发示例</h2> |
| <ul> |
| <li> |
| <p><strong>步骤 1</strong> 添加依赖。</p> |
| |
| <p>在Maven的pom.xml中添加所需的依赖:</p> |
| |
| <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="nt"><dependencyManagement></span> |
| <span class="nt"><dependencies></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.servicecomb<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>java-chassis-dependencies<span class="nt"></artifactId></span> |
| <span class="nt"><version></span>1.0.0-m1<span class="nt"></version></span> |
| <span class="nt"><type></span>pom<span class="nt"></type></span> |
| <span class="nt"><scope></span>import<span class="nt"></scope></span> |
| <span class="nt"></dependency></span> |
| <span class="nt"></dependencies></span> |
| <span class="nt"></dependencyManagement></span> |
| <span class="nt"><dependencies></span> |
| <span class="c"><!--transport根据microservice.yaml中endpoint发布需求选择,本例中两者都引入,也可以二选一--></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.servicecomb<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>transport-rest-vertx<span class="nt"></artifactId></span> |
| <span class="nt"></dependency></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.servicecomb<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>transport-highway<span class="nt"></artifactId></span> |
| <span class="nt"></dependency></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.apache.servicecomb<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>provider-springmvc<span class="nt"></artifactId></span> |
| <span class="nt"></dependency></span> |
| <span class="nt"><dependency></span> |
| <span class="nt"><groupId></span>org.slf4j<span class="nt"></groupId></span> |
| <span class="nt"><artifactId></span>slf4j-log4j12<span class="nt"></artifactId></span> |
| <span class="nt"></dependency></span> |
| <span class="nt"></dependencies></span> |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p><strong>步骤 2</strong> 实现服务。</p> |
| |
| <p>使用Spring MVC注解开发业务代码,Hello的服务实现如下:</p> |
| |
| <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kn">import</span> <span class="nn">javax.ws.rs.core.MediaType</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.springframework.web.bind.annotation.RequestBody</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.springframework.web.bind.annotation.RequestMapping</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.springframework.web.bind.annotation.RequestMethod</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.springframework.web.bind.annotation.RequestParam</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.servicecomb.samples.common.schema.models.Person</span><span class="o">;</span> |
| |
| <span class="nd">@RequestMapping</span><span class="o">(</span><span class="n">path</span> <span class="o">=</span> <span class="s">"/springmvchello"</span><span class="o">,</span> <span class="n">produces</span> <span class="o">=</span> <span class="nc">MediaType</span><span class="o">.</span><span class="na">APPLICATION_JSON</span><span class="o">)</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">SpringmvcHelloImpl</span> <span class="o">{</span> |
| <span class="nd">@RequestMapping</span><span class="o">(</span><span class="n">path</span> <span class="o">=</span> <span class="s">"/sayhi"</span><span class="o">,</span> <span class="n">method</span> <span class="o">=</span> <span class="nc">RequestMethod</span><span class="o">.</span><span class="na">POST</span><span class="o">)</span> |
| <span class="kd">public</span> <span class="nc">String</span> <span class="nf">sayHi</span><span class="o">(</span><span class="nd">@RequestParam</span><span class="o">(</span><span class="n">name</span> <span class="o">=</span> <span class="s">"name"</span><span class="o">)</span> <span class="nc">String</span> <span class="n">name</span><span class="o">)</span> <span class="o">{</span> |
| <span class="err"> </span> <span class="k">return</span> <span class="s">"Hello "</span> <span class="o">+</span> <span class="n">name</span><span class="o">;</span> |
| <span class="o">}</span> |
| |
| <span class="nd">@RequestMapping</span><span class="o">(</span><span class="n">path</span> <span class="o">=</span> <span class="s">"/sayhello"</span><span class="o">,</span> <span class="n">method</span> <span class="o">=</span> <span class="nc">RequestMethod</span><span class="o">.</span><span class="na">POST</span><span class="o">)</span> |
| <span class="kd">public</span> <span class="nc">String</span> <span class="nf">sayHello</span><span class="o">(</span><span class="nd">@RequestBody</span> <span class="nc">Person</span> <span class="n">person</span><span class="o">)</span> <span class="o">{</span> |
| <span class="err"> </span> <span class="k">return</span> <span class="s">"Hello person "</span> <span class="o">+</span> <span class="n">person</span><span class="o">.</span><span class="na">getName</span><span class="o">();</span> |
| <span class="err"> </span><span class="o">}</span> |
| <span class="o">}</span> |
| </code></pre></div> </div> |
| |
| <p><strong>注意:请一定在服务的实现类(本文档例子为SpringmvcHelloImpl)上标记@RequestMapping,否则接口发布的Path和Method将会不正确!</strong></p> |
| |
| <p>本例sayHi的访问Path为<code class="highlighter-rouge">/springmvchello/sayhi</code>,sayHello的访问Path为<code class="highlighter-rouge">/springmvchello/sayhello</code>,如果希望他们的访问路径为<code class="highlighter-rouge">/sayhi</code>和<code class="highlighter-rouge">/sayhello</code>,直接设置SpringmvcHelloImpl上的<code class="highlighter-rouge">@RequestMapping</code>为<code class="highlighter-rouge">@RequestMapping(path = "/")</code>。</p> |
| </li> |
| <li> |
| <p><strong>步骤 3</strong> 发布服务</p> |
| |
| <p>在服务的实现类上打上注解@RestSchema,指定schemaId,表示该实现作为当前微服务的一个schema发布,代码如下:</p> |
| |
| <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kn">import</span> <span class="nn">org.apache.servicecomb.provider.rest.common.RestSchema</span><span class="o">;</span> |
| <span class="c1">// other code omitted</span> |
| <span class="nd">@RestSchema</span><span class="o">(</span><span class="n">schemaId</span> <span class="o">=</span> <span class="s">"springmvcHello"</span><span class="o">)</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">SpringmvcHelloImpl</span> <span class="o">{</span> |
| <span class="c1">// other code omitted</span> |
| <span class="o">}</span> |
| </code></pre></div> </div> |
| |
| <p>然后在<code class="highlighter-rouge">resources/META-INF/spring</code>目录下创建<code class="highlighter-rouge">springmvcHello.bean.xml</code>文件,命名规则为<code class="highlighter-rouge">\*.bean.xml</code>,配置spring进行服务扫描的base-package,文件内容如下:</p> |
| |
| <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="cp"><?xml version="1.0" encoding="UTF-8"?></span> |
| |
| <span class="nt"><beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span> |
| <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> |
| <span class="na">xmlns:context=</span><span class="s">"http://www.springframework.org/schema/context"</span> |
| <span class="na">xsi:schemaLocation=</span><span class="s">"http://www.springframework.org/schema/beans classpath:org/springframework/beans/factory/xml/spring-beans-3.0.xsd |
| http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"</span><span class="nt">></span> |
| |
| <span class="nt"><context:component-scan</span> <span class="na">base-package=</span><span class="s">"org.apache.servicecomb.samples.springmvc.provider"</span><span class="nt">/></span> |
| <span class="nt"></beans></span> |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p><strong>步骤 4</strong> 添加服务定义。</p> |
| |
| <p>在resources目录中添加<a href="https://docs.servicecomb.io/java-chassis/zh_CN/build-provider/definition/service-definition.html">microservice.yaml</a>。</p> |
| </li> |
| <li> |
| <p><strong>步骤 5</strong> 添加Main启动类</p> |
| |
| <div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kn">import</span> <span class="nn">org.apache.servicecomb.foundation.common.utils.BeanUtils</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.servicecomb.foundation.common.utils.Log4jUtils</span><span class="o">;</span> |
| |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">Application</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="nc">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="nc">Exception</span> <span class="o">{</span> |
| <span class="c1">//初始化日志, 加载Bean(包括它们的参数), 以及注册Service, 更多信息可以参见文档 : https://docs.servicecomb.io/java-chassis/zh_CN/build-provider/bootup.html</span> |
| <span class="nc">Log4jUtils</span><span class="o">.</span><span class="na">init</span><span class="o">();</span> |
| <span class="nc">BeanUtils</span><span class="o">.</span><span class="na">init</span><span class="o">();</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| </code></pre></div> </div> |
| </li> |
| </ul> |
| |
| <h2 id="涉及api">涉及API</h2> |
| |
| <p>Spring MVC开发模式当前支持org.springframework.web.bind.annotation包下的如下注解,所有注解的使用方法参考<a href="https://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html">Spring MVC官方文档</a>。</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">注解</th> |
| <th style="text-align: left">位置</th> |
| <th style="text-align: left">描述</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">RequestMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">支持标注path/method/produces三种数据,operation默认继承schema上的produces</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">GetMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">支持标注path/produces两种数据,operation默认继承schema上的produces</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">PutMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">支持标注path/produces两种数据,operation默认继承schema上的produces</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">PostMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">支持标注path/produces两种数据,operation默认继承schema上的produces</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">DeleteMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">支持标注path/produces两种数据,operation默认继承schema上的produces</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">PatchMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">支持标注path/produces两种数据,operation默认继承schema上的produces</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">PathVariable</td> |
| <td style="text-align: left">parameter</td> |
| <td style="text-align: left">从path中获取参数</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">RequestParam</td> |
| <td style="text-align: left">parameter</td> |
| <td style="text-align: left">从query中获取参数</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">RequestHeader</td> |
| <td style="text-align: left">parameter</td> |
| <td style="text-align: left">从header中获取参数</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">RequestBody</td> |
| <td style="text-align: left">parameter</td> |
| <td style="text-align: left">从body中获取参数,每个operation只能有一个body参数</td> |
| </tr> |
| </tbody> |
| </table> |
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