java-websocket該建筑是easy。兒童無用的框架可以在這里下載主線和個人教學好java-websocket計劃：

Apach Tomcat 8.0.3+MyEclipse+maven+JDK1.7：

http://download.csdn.net/detail/up19910522/7719087

spring4.0以后增加了對websocket技術的支持，擼主眼下的項目用的是SSM（springMVC+spring+MyBatis）框

架，所以肯定要首選spring自帶的websocket了，好，如今問題來了，擼主在網上各種狂搜猛找，拼湊了幾個自稱是

spring?websocket的東東。下來一看，廢物。當中包含從github上down下來的。舉個樣例。在搭建過程中有個問題，

擼主上谷歌搜索，總共搜出來三頁結果共30條左右，前15條是純英文的 ?后15條是韓語和日語，而這30條結果都不能

解決擼主的問題，無奈，僅僅好上官網看全英幫助，在擼主驚人的毅力和不懈奮斗下。糾結了兩天的spring+websocket

整合今天算是徹底搭建成功，摸索透徹了。

websocket是眼下唯一真正實現全雙工通信的server向client推的互聯網技術，與長連接和輪詢技術相比，

websocket的優越性不言自明，長連接的連接資源（線程資源）隨著連接數量的增多。必會耗盡。client輪詢會給服

務器造成非常大的壓力，而websocket是在物理層非網絡層建立一條client至server的長連接，以此來保證server向客

戶端的即時推送，既不耗費線程資源，又不會不斷向server輪詢請求。

以下言歸正傳，講一講擼主在SSM（springMVC+spring+MyBatis）框架中集成websocket技術的曲折蛋疼直至成功喜悅之路。

• 1 在maven的pom.xml中增加websocket所依賴的jar包，什么，你不知道maven，快去度之或者查看擼主關于maven的博文惡補一下，spring-websocket所依賴的jar包有下面幾個：

<dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version> </dependency> <dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.3.0</version> </dependency> <dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.3.0</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-websocket</artifactId><version>4.0.1.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-messaging</artifactId><version>4.0.1.RELEASE</version> </dependency>

• 2 更新web.xml中namespace.xsd的版本號。

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:websocket="http://www.springframework.org/schema/websocket"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/websocket http://www.springframework.org/schema/websocket/spring-websocket.xsd">

• 3 更新spring框架的jar包至4.0以上（spring-core, spring-context, spring-web and spring-webmvc）

<dependency> <span style="white-space:pre"> </span><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${spring.version}</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>${spring.version}</version> </dependency>

• 4 ?4.1創建websocket處理類

package com.up.websocket.handler;import org.springframework.web.socket.TextMessage; import org.springframework.web.socket.WebSocketSession; import org.springframework.web.socket.handler.TextWebSocketHandler;public class WebsocketEndPoint extends TextWebSocketHandler {@Overrideprotected void handleTextMessage(WebSocketSession session,TextMessage message) throws Exception {super.handleTextMessage(session, message);TextMessage returnMessage = new TextMessage(message.getPayload()+" received at server");session.sendMessage(returnMessage);} }

• 4.2創建握手（handshake）接口

package com.up.websocket;import java.util.Map;import org.springframework.http.server.ServerHttpRequest; import org.springframework.http.server.ServerHttpResponse; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor;public class HandshakeInterceptor extends HttpSessionHandshakeInterceptor{@Overridepublic boolean beforeHandshake(ServerHttpRequest request,ServerHttpResponse response, WebSocketHandler wsHandler,Map<String, Object> attributes) throws Exception {System.out.println("Before Handshake");return super.beforeHandshake(request, response, wsHandler, attributes);}@Overridepublic void afterHandshake(ServerHttpRequest request,ServerHttpResponse response, WebSocketHandler wsHandler,Exception ex) {System.out.println("After Handshake");super.afterHandshake(request, response, wsHandler, ex);}}

• 5 處理類和握手協議的spring配置(applicationContext.xml文件）

<bean id="websocket" class="com.up.websocket.handler.WebsocketEndPoint"/><websocket:handlers><websocket:mapping path="/websocket" handler="websocket"/><websocket:handshake-interceptors><bean class="com.up.websocket.HandshakeInterceptor"/></websocket:handshake-interceptors> </websocket:handlers>

• 6 client頁面

<!DOCTYPE html> <html> <head><title>WebSocket/SockJS Echo Sample (Adapted from Tomcat's echo sample)</title><style type="text/css">#connect-container {float: left;width: 400px}#connect-container div {padding: 5px;}#console-container {float: left;margin-left: 15px;width: 400px;}#console {border: 1px solid #CCCCCC;border-right-color: #999999;border-bottom-color: #999999;height: 170px;overflow-y: scroll;padding: 5px;width: 100%;}#console p {padding: 0;margin: 0;}</style><script src="http://cdn.sockjs.org/sockjs-0.3.min.js"></script><script type="text/javascript">var ws = null;var url = null;var transports = [];function setConnected(connected) {document.getElementById('connect').disabled = connected;document.getElementById('disconnect').disabled = !connected;document.getElementById('echo').disabled = !connected;}function connect() {alert("url:"+url);if (!url) {alert('Select whether to use W3C WebSocket or SockJS');return;}ws = (url.indexOf('sockjs') != -1) ?

new SockJS(url, undefined, {protocols_whitelist: transports}) : new WebSocket(url); ws.onopen = function () { setConnected(true); log('Info: connection opened.'); }; ws.onmessage = function (event) { log('Received: ' + event.data); }; ws.onclose = function (event) { setConnected(false); log('Info: connection closed.'); log(event); }; } function disconnect() { if (ws != null) { ws.close(); ws = null; } setConnected(false); } function echo() { if (ws != null) { var message = document.getElementById('message').value; log('Sent: ' + message); ws.send(message); } else { alert('connection not established, please connect.'); } } function updateUrl(urlPath) { if (urlPath.indexOf('sockjs') != -1) { url = urlPath; document.getElementById('sockJsTransportSelect').style.visibility = 'visible'; } else { if (window.location.protocol == 'http:') { url = 'ws://' + window.location.host + urlPath; } else { url = 'wss://' + window.location.host + urlPath; } document.getElementById('sockJsTransportSelect').style.visibility = 'hidden'; } } function updateTransport(transport) { alert(transport); transports = (transport == 'all') ? [] : [transport]; } function log(message) { var console = document.getElementById('console'); var p = document.createElement('p'); p.style.wordWrap = 'break-word'; p.appendChild(document.createTextNode(message)); console.appendChild(p); while (console.childNodes.length > 25) { console.removeChild(console.firstChild); } console.scrollTop = console.scrollHeight; } </script> </head> <body> <noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable Javascript and reload this page!</h2></noscript> <div> <div id="connect-container"> <input id="radio1" type="radio" name="group1" οnclick="updateUrl(''/spring-websocket-uptest/websocket');"> <label for="radio1">W3C WebSocket</label> <br> <input id="radio2" type="radio" name="group1" οnclick="updateUrl('/spring-websocket-uptest/websocket');"> <label for="radio2">SockJS</label> <div id="sockJsTransportSelect" style="visibility:hidden;"> <span>SockJS transport:</span> <select οnchange="updateTransport(this.value)"> <option value="all">all</option> <option value="websocket">websocket</option> <option value="xhr-polling">xhr-polling</option> <option value="jsonp-polling">jsonp-polling</option> <option value="xhr-streaming">xhr-streaming</option> <option value="iframe-eventsource">iframe-eventsource</option> <option value="iframe-htmlfile">iframe-htmlfile</option> </select> </div> <div> <button id="connect" οnclick="connect();">Connect</button> <button id="disconnect" disabled="disabled" οnclick="disconnect();">Disconnect</button> </div> <div> <textarea id="message" style="width: 350px">Here is a message!</textarea> </div> <div> <button id="echo" οnclick="echo();" disabled="disabled">Echo message</button> </div> </div> <div id="console-container"> <div id="console"></div> </div> </div> </body> </html>

• 7 ?依照以上步驟搭建，依據個人開發環境不同。可能會出現各種問題，以下將在整個搭建過程中遇到的問題總結一下，詳見博文：http://blog.csdn.net/gisredevelopment/article/details/38397569

演示實例增強版下載：spring-websocket-uptest.rar

尊重原創。轉載請注明出處：

http://blog.csdn.net/gisredevelopment/article/details/38392629

技術郵箱，免費答疑：897658573@qq.com

版權聲明：本文博客原創文章，博客，未經同意，不得轉載。

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