java-websocket该建筑是easy。儿童无用的框架可以在这里下载主线和个人教学好java-websocket计划：

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

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

spring4.0以后增加了对websocket技术的支持，撸主眼下的项目用的是SSM（springMVC+spring+MyBatis）框

架，所以肯定要首选spring自带的websocket了，好，如今问题来了，撸主在网上各种狂搜猛找，拼凑了几个自称是

springwebsocket的东东。下来一看，废物。当中包含从github上down下来的。举个样例。在搭建过程中有个问题，

撸主上谷歌搜索，总共搜出来三页结果共30条左右，前15条是纯英文的  后15条是韩语和日语，而这30条结果都不能

解决撸主的问题，无奈，仅仅好上官网看全英帮助，在撸主惊人的毅力和不懈奋斗下。纠结了两天的spring+websocket

整合今天算是彻底搭建成功，摸索透彻了。

websocket是眼下唯一真正实现全双工通信的server向client推的互联网技术，与长连接和轮询技术相比，

websocket的优越性不言自明，长连接的连接资源（线程资源）随着连接数量的增多。必会耗尽。client轮询会给服

务器造成非常大的压力，而websocket是在物理层非网络层建立一条client至server的长连接，以此来保证server向客

户端的即时推送，既不耗费线程资源，又不会不断向server轮询请求。

以下言归正传，讲一讲撸主在SSM（springMVC+spring+MyBatis）框架中集成websocket技术的曲折蛋疼直至成功喜悦之路。

• 1 在maven的pom.xml中增加websocket所依赖的jar包，什么，你不知道maven，快去度之或者查看撸主关于maven的博文恶补一下，spring-websocket所依赖的jar包有下面几个：

<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的版本号。

<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创建websocket处理类

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创建握手（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 处理类和握手协议的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页面

<!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  依照以上步骤搭建，依据个人开发环境不同。可能会出现各种问题，以下将在整个搭建过程中遇到的问题总结一下，详见博文：http://blog.csdn.net/gisredevelopment/article/details/38397569

演示实例增强版下载：spring-websocket-uptest.rar

尊重原创。转载请注明出处：

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

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