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<time class="post-full-meta-date" datetime=" 4 February 2020"> 4 February 2020</time>
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<a href='/category/spring/'>SPRING</a>
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<h1 class="post-full-title">Spring 프로젝트에 WebSocket 적용하기</h1>
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<p>웹 프로젝트를 진행하다보면 단순히 Restful API로 처리할 수 없는 요건이 생길 수 있다. 보통 HTTP 통신은 클라이언트에서 Request를 날린 후 서버의 Response를 받는 형식인데, Server에서부터 통신이 시작되야되는 요건이 있을 수 있다. 혹은 지속적으로 connection을 맺고 있어야 한다거나…<em>(실시간 채팅 혹은 알림 서비스가 그런 요건에 속한다.)</em></p>
<p>이를 구현할 때는 HTTP 프로토콜을 이용하여 Polling 방식을 통해 구현할 수도 있지만, 이런 요구조건을 맞추기 위해 WebSocket API가 등장했다. 이름 그대로 Web 상에서 Socket 방식으로 통신을 구현한다.</p>
<p>WebSocket은 구버전 브라우저에선 지원하지 않는 다는 단점이 있는데, 이를 보완하기 위해 SockJS라는 모듈이 있다. SockJS는 구버전 브라우저에서도 WebSocket 코드가 그대로 동작하도록 도와준다. (polyfill로 볼 수 있을 듯 하다.)</p>
<p>본 포스트는 Spring에서 제공하는 가이드를 보고 만들었기 때문에 자세한 사항은 아래 링크 가이드에서 볼 수 있다.</p>
<p><a href="https://spring.io/guides/gs/messaging-stomp-websocket/">Spring WebSocket 적용 가이드</a></p>
<p>또한 이전에 진행한 Bootstrap을 적용한 Spring 프로젝트를 이용해서 진행한다.</p>
<p><a href="/spring/add-bootstrap">Spring 프로젝트에 Bootstrap 적용하기</a></p>
<h2 id="websocket-모듈-적용">WebSocket 모듈 적용</h2>
<p>프로젝트에 WebSocket 모듈을 적용해보자. pom.xml에 아래 코드를 통해 모듈을 추가하자.</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><dependency></span>
<span class="nt"><groupId></span>org.springframework.boot<span class="nt"></groupId></span>
<span class="nt"><artifactId></span>spring-boot-starter-websocket<span class="nt"></artifactId></span>
<span class="nt"></dependency></span>
<span class="c"><!-- websocket --></span>
<span class="nt"><dependency></span>
<span class="nt"><groupId></span>org.webjars<span class="nt"></groupId></span>
<span class="nt"><artifactId></span>webjars-locator-core<span class="nt"></artifactId></span>
<span class="nt"></dependency></span>
<span class="nt"><dependency></span>
<span class="nt"><groupId></span>org.webjars<span class="nt"></groupId></span>
<span class="nt"><artifactId></span>sockjs-client<span class="nt"></artifactId></span>
<span class="nt"><version></span>1.0.2<span class="nt"></version></span>
<span class="nt"></dependency></span>
<span class="nt"><dependency></span>
<span class="nt"><groupId></span>org.webjars<span class="nt"></groupId></span>
<span class="nt"><artifactId></span>stomp-websocket<span class="nt"></artifactId></span>
<span class="nt"><version></span>2.3.3<span class="nt"></version></span>
<span class="nt"></dependency></span>
</code></pre></div></div>
<p>이번 포스트에서는 가이드대로 webjars 기술을 이용해보았다. webjars는 간단히 말하면 웹 라이브러리 의존성 관리 도구이다. 웹 라이브러리를 JAR 파일 안에 패키징해준다. 그렇기 때문에 따로 라이브러리를 다운로드 받을 필요 없이 /webjars path를 통해서 라이브러리를 사용할 수 있게 해준다.</p>
<h2 id="java-코드-생성">JAVA 코드 생성</h2>
<p>그 다음 두가지 객체를 만들어 준다. 하나는 HelloMessage.java 파일로 클라이언트에서 입력한 이름을 받는 객체이다. 나머지 하나는 Greeting.java 파일로 받은 이름과 같이 클라이언트쪽으로 응답할 때 사용하는 객체이다. 일단 com.example.demo.websocket.vo 패키지를 만든 뒤 아래 코드와 같이 객체를 추가해주자.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-1.JPG" alt="add-websocket-1" /></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">package</span> <span class="nn">com.example.demo.websocket.vo</span><span class="o">;</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloMessage</span> <span class="o">{</span>
<span class="kd">private</span> <span class="nc">String</span> <span class="n">name</span><span class="o">;</span>
<span class="kd">public</span> <span class="nf">HelloMessage</span><span class="o">()</span> <span class="o">{}</span>
<span class="kd">public</span> <span class="nf">HelloMessage</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="k">this</span><span class="o">.</span><span class="na">name</span> <span class="o">=</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">getName</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">setName</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="k">this</span><span class="o">.</span><span class="na">name</span> <span class="o">=</span> <span class="n">name</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">package</span> <span class="nn">com.example.demo.websocket.vo</span><span class="o">;</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">Greeting</span> <span class="o">{</span>
<span class="kd">private</span> <span class="nc">String</span> <span class="n">content</span><span class="o">;</span>
<span class="kd">public</span> <span class="nf">Greeting</span><span class="o">()</span> <span class="o">{}</span>
<span class="kd">public</span> <span class="nf">Greeting</span><span class="o">(</span><span class="nc">String</span> <span class="n">content</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">content</span> <span class="o">=</span> <span class="n">content</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">getContent</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">content</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<p>그 다음 com.example.demo.websocket.web 패키지를 만든 뒤 GreetingController.java 파일을 추가하자. 코드는 아래와 같다.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-2.JPG" alt="add-websocket-2" /></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">package</span> <span class="nn">com.example.demo.websocket.web</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.messaging.handler.annotation.MessageMapping</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.messaging.handler.annotation.SendTo</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.stereotype.Controller</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.web.util.HtmlUtils</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">com.example.demo.websocket.vo.Greeting</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">com.example.demo.websocket.vo.HelloMessage</span><span class="o">;</span>
<span class="nd">@Controller</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">GreetingController</span> <span class="o">{</span>
<span class="nd">@MessageMapping</span><span class="o">(</span><span class="s">"/hello"</span><span class="o">)</span> <span class="c1">// 요청을 받는 곳</span>
<span class="nd">@SendTo</span><span class="o">(</span><span class="s">"/topic/greetings"</span><span class="o">)</span> <span class="c1">// 괄호 안의 메시지 브로커에 return 값을 보낸다.</span>
<span class="kd">public</span> <span class="nc">Greeting</span> <span class="nf">greeting</span><span class="o">(</span><span class="nc">HelloMessage</span> <span class="n">message</span><span class="o">)</span> <span class="kd">throws</span> <span class="nc">Exception</span> <span class="o">{</span>
<span class="nc">Thread</span><span class="o">.</span><span class="na">sleep</span><span class="o">(</span><span class="mi">1000</span><span class="o">);</span> <span class="c1">// 수동 딜레이</span>
<span class="k">return</span> <span class="k">new</span> <span class="nf">Greeting</span><span class="o">(</span><span class="s">"Hello, "</span> <span class="o">+</span> <span class="nc">HtmlUtils</span><span class="o">.</span><span class="na">htmlEscape</span><span class="o">(</span><span class="n">message</span><span class="o">.</span><span class="na">getName</span><span class="o">())</span> <span class="o">+</span> <span class="s">"!"</span><span class="o">);</span>
<span class="o">}</span>
<span class="nd">@RequestMapping</span><span class="o">(</span><span class="s">"/websocket"</span><span class="o">)</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">websocket</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="s">"websocket"</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<p>이제 JSP에서 테스트 코드를 작성하기 전에, WebSocket 설정 파일을 작성하자. com.example.demo.config 패키지를 만들고 WebSocketConfig.java 파일을 작성하자. 코드는 아래와 같다.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-3.JPG" alt="add-websocket-3" /></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">package</span> <span class="nn">com.example.demo.config</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.context.annotation.Configuration</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.messaging.simp.config.MessageBrokerRegistry</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.web.socket.config.annotation.StompEndpointRegistry</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer</span><span class="o">;</span>
<span class="nd">@Configuration</span>
<span class="nd">@EnableWebSocketMessageBroker</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">WebSocketConfig</span> <span class="kd">implements</span> <span class="nc">WebSocketMessageBrokerConfigurer</span> <span class="o">{</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">configureMessageBroker</span><span class="o">(</span><span class="nc">MessageBrokerRegistry</span> <span class="n">config</span><span class="o">)</span> <span class="o">{</span>
<span class="n">config</span><span class="o">.</span><span class="na">enableSimpleBroker</span><span class="o">(</span><span class="s">"/topic"</span><span class="o">);</span> <span class="c1">// /topic path에 메시지 브로커 생성</span>
<span class="n">config</span><span class="o">.</span><span class="na">setApplicationDestinationPrefixes</span><span class="o">(</span><span class="s">"/app"</span><span class="o">);</span> <span class="c1">// 요청받는 path의 앞단</span>
<span class="o">}</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">registerStompEndpoints</span><span class="o">(</span><span class="nc">StompEndpointRegistry</span> <span class="n">registry</span><span class="o">)</span> <span class="o">{</span>
<span class="n">registry</span><span class="o">.</span><span class="na">addEndpoint</span><span class="o">(</span><span class="s">"/gs-guide-websocket"</span><span class="o">).</span><span class="na">withSockJS</span><span class="o">();</span> <span class="c1">// WebSocket 기본 path</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<h2 id="jsp-js-코드-생성">JSP, JS 코드 생성</h2>
<p>이제 JSP 파일을 추가해보자. JSP 파일은 src/main/webapp/WEB-INF/jsp 폴더 안에 websocket.jsp로 만들고 코드는 아래와 같이 작성했다.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-4.JPG" alt="add-websocket-4" /></p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><%@ page </span><span class="na">language=</span><span class="s">"java"</span><span class="na"> contentType=</span><span class="s">"text/html; charset=EUC-KR"</span><span class="na"> pageEncoding=</span><span class="s">"EUC-KR"</span><span class="nt">%></span>
<span class="nt"><%@ taglib </span><span class="na">prefix=</span><span class="s">"c"</span><span class="na"> uri=</span><span class="s">"http://java.sun.com/jsp/jstl/core"</span><span class="nt">%></span>
<span class="cp"><!DOCTYPE html></span>
<span class="nt"><html></span>
<span class="nt"><head></span>
<span class="nt"><meta</span> <span class="na">charset=</span><span class="s">"EUC-KR"</span><span class="nt">></span>
<span class="nt"><link</span> <span class="na">rel=</span><span class="s">"stylesheet"</span> <span class="na">href=</span><span class="s">"</span><span class="nt"><c:url </span><span class="na">value=</span><span class="s">'/libs/bootstrap-4.4.1-dist/css/bootstrap.min.css'</span><span class="nt">/></span><span class="s">"</span><span class="nt">></span>
<span class="nt"><script </span><span class="na">src=</span><span class="s">"/webjars/sockjs-client/sockjs.min.js"</span><span class="nt">></script></span>
<span class="nt"><script </span><span class="na">src=</span><span class="s">"/webjars/stomp-websocket/stomp.min.js"</span><span class="nt">></script></span>
<span class="nt"><script </span><span class="na">src=</span><span class="s">"</span><span class="nt"><c:url </span><span class="na">value=</span><span class="s">'/libs/jquery-3.4.1.min.js'</span><span class="nt">/></span><span class="s">"</span><span class="nt">></script></span>
<span class="nt"><script </span><span class="na">src=</span><span class="s">"</span><span class="nt"><c:url </span><span class="na">value=</span><span class="s">'/libs/bootstrap-4.4.1-dist/js/bootstrap.min.js'</span><span class="nt">/></span><span class="s">"</span><span class="nt">></script></span>
<span class="nt"><title></span>Insert title here<span class="nt"></title></span>
<span class="nt"></head></span>
<span class="nt"><body></span>
<span class="nt"><section</span> <span class="na">id=</span><span class="s">"main-content"</span><span class="nt">></span>
<span class="nt"><section</span> <span class="na">class=</span><span class="s">"wrapper"</span><span class="nt">></span>
<span class="nt"><h3><i</span> <span class="na">class=</span><span class="s">"fa fa-angle-right"</span><span class="nt">></i></span> WebSocket<span class="nt"></h3></span>
<span class="nt"><div</span> <span class="na">class=</span><span class="s">"row"</span><span class="nt">></span>
<span class="nt"><div</span> <span class="na">class=</span><span class="s">"col-md-6"</span><span class="nt">></span>
<span class="nt"><form</span> <span class="na">class=</span><span class="s">"form-inline"</span><span class="nt">></span>
<span class="nt"><div</span> <span class="na">class=</span><span class="s">"form-group"</span><span class="nt">></span>
<span class="nt"><label</span> <span class="na">for=</span><span class="s">"connect"</span><span class="nt">></span>WebSocket connection:<span class="nt"></label></span>
<span class="nt"><button</span> <span class="na">id=</span><span class="s">"connect"</span> <span class="na">class=</span><span class="s">"btn btn-default"</span> <span class="na">type=</span><span class="s">"submit"</span><span class="nt">></span>Connect<span class="nt"></button></span>
<span class="nt"><button</span> <span class="na">id=</span><span class="s">"disconnect"</span> <span class="na">class=</span><span class="s">"btn btn-default"</span> <span class="na">type=</span><span class="s">"submit"</span> <span class="na">disabled=</span><span class="s">"disabled"</span><span class="nt">></span>Disconnect
<span class="nt"></button></span>
<span class="nt"></div></span>
<span class="nt"></form></span>
<span class="nt"></div></span>
<span class="nt"><div</span> <span class="na">class=</span><span class="s">"col-md-6"</span><span class="nt">></span>
<span class="nt"><form</span> <span class="na">class=</span><span class="s">"form-inline"</span><span class="nt">></span>
<span class="nt"><div</span> <span class="na">class=</span><span class="s">"form-group"</span><span class="nt">></span>
<span class="nt"><label</span> <span class="na">for=</span><span class="s">"name"</span><span class="nt">></span>What is your name?<span class="nt"></label></span>
<span class="nt"><input</span> <span class="na">type=</span><span class="s">"text"</span> <span class="na">id=</span><span class="s">"name"</span> <span class="na">class=</span><span class="s">"form-control"</span> <span class="na">placeholder=</span><span class="s">"Your name here..."</span><span class="nt">></span>
<span class="nt"></div></span>
<span class="nt"><button</span> <span class="na">id=</span><span class="s">"send"</span> <span class="na">class=</span><span class="s">"btn btn-default"</span> <span class="na">type=</span><span class="s">"submit"</span><span class="nt">></span>Send<span class="nt"></button></span>
<span class="nt"></form></span>
<span class="nt"></div></span>
<span class="nt"></div></span>
<span class="nt"><div</span> <span class="na">class=</span><span class="s">"row"</span><span class="nt">></span>
<span class="nt"><div</span> <span class="na">class=</span><span class="s">"col-md-12"</span><span class="nt">></span>
<span class="nt"><table</span> <span class="na">id=</span><span class="s">"conversation"</span> <span class="na">class=</span><span class="s">"table table-striped"</span><span class="nt">></span>
<span class="nt"><thead></span>
<span class="nt"><tr></span>
<span class="nt"><th></span>Greetings<span class="nt"></th></span>
<span class="nt"></tr></span>
<span class="nt"></thead></span>
<span class="nt"><tbody</span> <span class="na">id=</span><span class="s">"greetings"</span><span class="nt">></span>
<span class="nt"></tbody></span>
<span class="nt"></table></span>
<span class="nt"></div></span>
<span class="nt"></div></span>
<span class="nt"></section></span>
<span class="nt"></section></span>
<span class="nt"></body></span>
<span class="nt"></html></span>
</code></pre></div></div>
<p>브라우저에서 키보드의 <strong>F12</strong>키를 눌러서 개발자 도구를 연 뒤 <strong>Network</strong>탭을 클릭하자. 그 후 브라우저를 새로고침한 뒤 sockjs 모듈과 stomp 모듈이 제대로 호출되는지 확인해보자. webjars를 이용하여 라이브러리를 직접 추가해주지 않아도 호출되는 모습을 확인할 수 있다.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-5.JPG" alt="add-websocket-5" /></p>
<p>마지막으로 websocket.js 파일을 추가해주려 한다. src/resources/static/js/websocket 폴더 내에 websocket.js 파일을 추가해주자.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-6.JPG" alt="add-websocket-6" /></p>
<p>그 다음 아래 코드를 입력하자.</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">var</span> <span class="nx">stompClient</span> <span class="o">=</span> <span class="kc">null</span><span class="p">;</span>
<span class="c1">// connected 상태 변경</span>
<span class="kd">function</span> <span class="nx">setConnected</span><span class="p">(</span><span class="nx">connected</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">$</span><span class="p">(</span><span class="dl">"</span><span class="s2">#connect</span><span class="dl">"</span><span class="p">).</span><span class="nx">prop</span><span class="p">(</span><span class="dl">"</span><span class="s2">disabled</span><span class="dl">"</span><span class="p">,</span> <span class="nx">connected</span><span class="p">);</span>
<span class="nx">$</span><span class="p">(</span><span class="dl">"</span><span class="s2">#disconnect</span><span class="dl">"</span><span class="p">).</span><span class="nx">prop</span><span class="p">(</span><span class="dl">"</span><span class="s2">disabled</span><span class="dl">"</span><span class="p">,</span> <span class="o">!</span><span class="nx">connected</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">connected</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">$</span><span class="p">(</span><span class="dl">"</span><span class="s2">#conversation</span><span class="dl">"</span><span class="p">).</span><span class="nx">show</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">else</span> <span class="p">{</span>
<span class="nx">$</span><span class="p">(</span><span class="dl">"</span><span class="s2">#conversation</span><span class="dl">"</span><span class="p">).</span><span class="nx">hide</span><span class="p">();</span>
<span class="p">}</span>
<span class="nx">$</span><span class="p">(</span><span class="dl">"</span><span class="s2">#greetings</span><span class="dl">"</span><span class="p">).</span><span class="nx">html</span><span class="p">(</span><span class="dl">""</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">// WebSocket 접속</span>
<span class="kd">function</span> <span class="nx">connect</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">socket</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">SockJS</span><span class="p">(</span><span class="dl">'</span><span class="s1">/gs-guide-websocket</span><span class="dl">'</span><span class="p">);</span> <span class="c1">// WebSocketConfig.java에서 설정한 endpoint</span>
<span class="nx">stompClient</span> <span class="o">=</span> <span class="nx">Stomp</span><span class="p">.</span><span class="nx">over</span><span class="p">(</span><span class="nx">socket</span><span class="p">);</span> <span class="c1">// socket을 이용하여 stompClient 생성</span>
<span class="c1">// socket 접속</span>
<span class="nx">stompClient</span><span class="p">.</span><span class="nx">connect</span><span class="p">({},</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">frame</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">setConnected</span><span class="p">(</span><span class="kc">true</span><span class="p">);</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="dl">'</span><span class="s1">Connected: </span><span class="dl">'</span> <span class="o">+</span> <span class="nx">frame</span><span class="p">);</span>
<span class="c1">// '/topic/greetings' 메시지 브로커 구독</span>
<span class="c1">// 해당 토픽에 메시지가 게시되면 이 클라이언트가 메시지를 읽어서 클라이언트의 콜백함수를 통해 메시지 전달</span>
<span class="nx">stompClient</span><span class="p">.</span><span class="nx">subscribe</span><span class="p">(</span><span class="dl">'</span><span class="s1">/topic/greetings</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">greeting</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">showGreeting</span><span class="p">(</span><span class="nx">JSON</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="nx">greeting</span><span class="p">.</span><span class="nx">body</span><span class="p">).</span><span class="nx">content</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">}</span>
<span class="c1">// WebSocket 접속 끊기</span>
<span class="kd">function</span> <span class="nx">disconnect</span><span class="p">()</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">stompClient</span> <span class="o">!==</span> <span class="kc">null</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">stompClient</span><span class="p">.</span><span class="nx">disconnect</span><span class="p">();</span>
<span class="p">}</span>
<span class="nx">setConnected</span><span class="p">(</span><span class="kc">false</span><span class="p">);</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="dl">"</span><span class="s2">Disconnected</span><span class="dl">"</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">// message 보내기</span>
<span class="kd">function</span> <span class="nx">sendName</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">stompClient</span><span class="p">.</span><span class="nx">send</span><span class="p">(</span><span class="dl">"</span><span class="s2">/app/hello</span><span class="dl">"</span><span class="p">,</span> <span class="p">{},</span> <span class="nx">JSON</span><span class="p">.</span><span class="nx">stringify</span><span class="p">({</span><span class="dl">'</span><span class="s1">name</span><span class="dl">'</span><span class="p">:</span> <span class="nx">$</span><span class="p">(</span><span class="dl">"</span><span class="s2">#name</span><span class="dl">"</span><span class="p">).</span><span class="nx">val</span><span class="p">()}));</span>
<span class="p">}</span>
<span class="c1">// 서버로부터 받은 메시지 출력</span>
<span class="kd">function</span> <span class="nx">showGreeting</span><span class="p">(</span><span class="nx">message</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">$</span><span class="p">(</span><span class="dl">"</span><span class="s2">#greetings</span><span class="dl">"</span><span class="p">).</span><span class="nx">append</span><span class="p">(</span><span class="dl">"</span><span class="s2"><tr><td></span><span class="dl">"</span> <span class="o">+</span> <span class="nx">message</span> <span class="o">+</span> <span class="dl">"</span><span class="s2"></td></tr></span><span class="dl">"</span><span class="p">);</span>
<span class="p">}</span>
<span class="nx">$</span><span class="p">(</span><span class="kd">function</span> <span class="p">()</span> <span class="p">{</span>
<span class="nx">$</span><span class="p">(</span><span class="dl">"</span><span class="s2">form</span><span class="dl">"</span><span class="p">).</span><span class="nx">on</span><span class="p">(</span><span class="dl">'</span><span class="s1">submit</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">e</span><span class="p">.</span><span class="nx">preventDefault</span><span class="p">();</span>
<span class="p">});</span>
<span class="nx">$</span><span class="p">(</span> <span class="dl">"</span><span class="s2">#connect</span><span class="dl">"</span> <span class="p">).</span><span class="nx">click</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="nx">connect</span><span class="p">();</span> <span class="p">});</span>
<span class="nx">$</span><span class="p">(</span> <span class="dl">"</span><span class="s2">#disconnect</span><span class="dl">"</span> <span class="p">).</span><span class="nx">click</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="nx">disconnect</span><span class="p">();</span> <span class="p">});</span>
<span class="nx">$</span><span class="p">(</span> <span class="dl">"</span><span class="s2">#send</span><span class="dl">"</span> <span class="p">).</span><span class="nx">click</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="nx">sendName</span><span class="p">();</span> <span class="p">});</span>
<span class="p">});</span>
</code></pre></div></div>
<p>websocket.jsp 파일에 아래 코드를 추가해준다.</p>
<div class="language-jsp highlighter-rouge"><div class="highlight"><pre class="highlight"><code>...
<span class="nt"><script </span><span class="na">src=</span><span class="s">"</span><span class="nt"><c:url </span><span class="na">value=</span><span class="s">'/js/websocket/websocket.js'</span><span class="nt">/></span><span class="s">"</span><span class="nt">></script></span>
...
</code></pre></div></div>
<h2 id="테스트해보기">테스트해보기</h2>
<p>이제 브라우저를 새로고침하여 개발자도구 콘솔에서 에러가 없는지 확인 후, <strong>Connect</strong> 버튼을 눌러보자. Connect 버튼을 누른 뒤에 개발자 도구의 콘솔에 아래 이미지와 같이 나타나면 성공이다.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-7.JPG" alt="add-websocket-7" /></p>
<p>이제 Connected 상태에서 오른쪽 <strong>What is your name?</strong>이라 써있는 간단한 폼에 글자를 입력한 뒤 <strong>Send</strong>버튼을 클릭해보자. 정상작동됬다면 아래 이미지처럼 뜰 것이다.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-8.JPG" alt="add-websocket-8" /></p>
<p>마지막으로 <strong>Disconnect</strong> 버튼을 클릭하여 연결을 끊어보자. 이 역시 정상작동하면 아래 이미지처럼 나올 것이다.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-9.JPG" alt="add-websocket-9" /></p>
<h2 id="java에서-어노테이션-외에-코드상으로-websocket-사용하기">JAVA에서 어노테이션 외에 코드상으로 WebSocket 사용하기</h2>
<p>위에서 WebSocket의 동작을 확인해봤다. 하지만 클라이언트에서 요청을 하면 해당 요청을 매핑하여 받은 뒤 브로커로 보내는 방식이 얼핏보면 Restful API와 별다를 바가 없어 보인다. 물론 내부적으로는 socket을 통해서 메시지 브로커가 토픽상의 메시지를 주고 받는 것이지만..</p>
<p>이런 식의 구현이 아닌, JAVA에서 무언가 일을 처리한 뒤 메시지 브로커로 보내는 방법은 없을까 싶어서 찾아보니 코드상으로도 메시지 브로커에 메시지를 보내는 방법이 있었다. 단순히 웹 상에서 요청을 받았을 때 메시지 브로커로 데이터를 보내는 것이 아니라 서버가 구동되는 순간이라던지, 스케쥴러가 돌아간 순간이라던지 순수 JAVA 코드가 실행된 후에 메시지 브로커로 데이터를 보낼 수 있는 방법이다.</p>
<p>하지만 본 포스트에 사용된 프로젝트로는 마땅한 예제를 만들기엔 조금 힘들어서 예제 코드로만 설명을 하려 한다.</p>
<p>일단 com.example.demo.websocket.service 패키지를 만든 뒤 WebSocketService.java 파일을 만들자.</p>
<p><img src="\assets\built\images\add-websocket\add-websocket-10.JPG" alt="add-websocket-10" /></p>
<p>코드는 아래처럼 추가해주자.</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">package</span> <span class="nn">com.example.demo.websocket.service</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.beans.factory.annotation.Autowired</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.messaging.simp.SimpMessagingTemplate</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">org.springframework.stereotype.Service</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">com.example.demo.websocket.vo.Greeting</span><span class="o">;</span>
<span class="nd">@Service</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">WebSocketService</span> <span class="o">{</span>
<span class="nd">@Autowired</span>
<span class="kd">private</span> <span class="nc">SimpMessagingTemplate</span> <span class="n">template</span><span class="o">;</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">myTestService</span><span class="o">()</span> <span class="o">{</span>
<span class="c1">// '/topic/greetings' 토픽에 메시지 게시</span>
<span class="n">template</span><span class="o">.</span><span class="na">convertAndSend</span><span class="o">(</span><span class="s">"/topic/greetings"</span><span class="o">,</span> <span class="k">new</span> <span class="nc">Greeting</span><span class="o">(</span><span class="s">"Hello"</span><span class="o">));</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div></div>
<p>이제 WebSocketService의 myTestService 메소드를 호출하면 <em>/topic/greetings</em>토픽에 두번째 파라미터를 데이터로 게시하게 된다. 이는 필요한 부분에 커스터마이징하여 사용하면 될 것으로 보인다.</p>
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