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：

：

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

spring websocket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：

         
      
       javax.servlet
          
      
       javax.servlet-api
          
      
       3.1.0
      
     
         
      
       com.fasterxml.jackson.core
          
      
       jackson-core
          
      
       2.3.0
      
     
         
      
       com.fasterxml.jackson.core
          
      
       jackson-databind
          
      
       2.3.0
      
     
        
      
       org.springframework
         
      
       spring-websocket
         
      
       4.0.1.RELEASE
      
     
        
      
       org.springframework
         
      
       spring-messaging
         
      
       4.0.1.RELEASE
      
     

• 2 更新web.xml中namespace.xsd的版本号。

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

     
      	
      
       org.springframework
      	
      
       spring-core
      	
      
       ${spring.version}
      
     
     	
      
       org.springframework
      	
      
       spring-web
      	
      
       ${spring.version}
      
     
     	
      
       org.springframework
      	
      
       spring-webmvc
      	
      
       ${spring.version}
      
     
     	
      
       org.springframework
      	
      
       spring-context-support
      	
      
       ${spring.version}
      
     

• 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 {	@Override	protected 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{	@Override	public boolean beforeHandshake(ServerHttpRequest request,			ServerHttpResponse response, WebSocketHandler wsHandler,			Map
     
       attributes) throws Exception {		System.out.println("Before Handshake");		return super.beforeHandshake(request, response, wsHandler, attributes);	}	@Override	public 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）

• 6 client页面

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：

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