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| <header> |
| <h1 class="page__title" itemprop="headline">Develop Microservice with SpringMVC |
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| <li><a href="#concept-description" id="markdown-toc-concept-description">Concept Description</a></li> |
| <li><a href="#development-example" id="markdown-toc-development-example">Development Example</a></li> |
| <li><a href="#involved-apis" id="markdown-toc-involved-apis">Involved APIs</a></li> |
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| <h2 id="concept-description">Concept Description</h2> |
| |
| <p>ServiceComb supports Spring MVC remark and allows you to develop microservices in Spring MVC mode.</p> |
| |
| <h2 id="development-example">Development Example</h2> |
| |
| <ul> |
| <li> |
| <p><strong>Step 1</strong> Import dependencies into your maven project:</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 can optional import through endpoint setting in microservice.yaml, we import both rest and highway as example--></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>Step 2</strong> Implement the services. Spring MVC is used to describe the development of service code. The implementation of the Hello service is as follow:</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>Note: PLEASE MAKE SURE TO MARK @RequestMapping ON YOUR PRODUCER(SpringmvcHelloImpl), OR THE PATH AND METHOD OF PUBLISHED WILL BE INCORRECT!</strong></p> |
| |
| <p>In this sample the Path of sayHi is <code class="highlighter-rouge">/springmvchello/sayhi</code>, and the Path of sayHello is <code class="highlighter-rouge">/springmvchello/sayhello</code>, if you wish them <code class="highlighter-rouge">/sayhi</code> and <code class="highlighter-rouge">/sayhello</code>, please change the setting of <code class="highlighter-rouge">@RequestMapping</code> on the SpringmvcHelloImpl to <code class="highlighter-rouge">@RequestMapping("/")</code>.</p> |
| </li> |
| <li> |
| <p><strong>Step 3</strong> Release the service. Add @RestSchema as the annotation of the service implementation class and specify schemaId, which indicates that the implementation is released as a schema of the current microservice. The code is as follows:</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>Create the <code class="highlighter-rouge">springmvcHello.bean.xml</code> file(the file name format is *.bean.xml) in the <code class="highlighter-rouge">resources/META-INF/spring</code> directory and configure base-package that performs scanning. The content of the file is as follows:</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>Step 4</strong> Add service definition file:</p> |
| |
| <p>Add <a href="https://docs.servicecomb.io/java-chassis/zh_CN/build-provider/definition/service-definition.html">microservice.yaml</a> file into resources folder of your project.</p> |
| </li> |
| <li> |
| <p><strong>Step 5</strong> Add Main class:</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">//initializing log, loading bean(including its parameters), and registering service, more detail can be found here : 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="involved-apis">Involved APIs</h2> |
| |
| <p>Currently, the Spring MVC development mode supports the following annotations in the org.springframework.web.bind.annotation package. For details about how to use the annotations, see <a href="https://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html">Spring MVC official documentation</a>。</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Remarks</th> |
| <th style="text-align: left">Location</th> |
| <th style="text-align: left">Description</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">Data of path, method or produces is allowed. By default, an operation inherits produces from a schema.</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">GetMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">Data of path or produces is allowed. By default, an operation inherits produces from a schema.</td> |
| </tr> |
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| <td style="text-align: left">PutMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">Data of path or produces is allowed, an operation inherits produces from a schema.</td> |
| </tr> |
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| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">Data of path or produces is allowed, an operation inherits produces from a schema.</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">DeleteMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">Data of path or produces is allowed, an operation inherits produces from a schema.</td> |
| </tr> |
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| <td style="text-align: left">PatchMapping</td> |
| <td style="text-align: left">schema/operation</td> |
| <td style="text-align: left">Data of path or produces is allowed, an operation inherits produces from a schema.</td> |
| </tr> |
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| <td style="text-align: left">parameter</td> |
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