spring+websocket整合（springMVC+spring+MyBatis即SSM框架和websocket技术的整合）

java-websocket的搭建非常之容易，没用框架的童鞋可以在这里下载撸主亲自调教好的java-websocket程序：

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

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

spring4.0以后加入了对websocket技术的支持，撸主目前的项目用的是SSM（springMVC+spring+MyBatis）框

架，所以肯定要首选spring自带的websocket了，好，现在问题来了，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，其中包括从github上down下来的。举个例子，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，只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是目前唯一真正实现全双工通信的服务器向客户端推的互联网技术，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，客户端轮询会给服

务器造成很大的压力，而websocket是在物理层非网络层建立一条客户端至服务器的长连接，以此来保证服务器向客

户端的即时推送，既不耗费线程资源，又不会不断向服务器轮询请求。

下面言归正传，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中加入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包有以下几个：

<groupId>javax.servlet</groupId>

<artifactId>javax.servlet-api</artifactId>

</dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-core</artifactId>

</dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-databind</artifactId>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-websocket</artifactId>

<version>4.0.1.RELEASE</version>

</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，

<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.xsd

http://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）

<span style="white-space:pre"> </span><groupId>org.springframework</groupId>

<artifactId>spring-core</artifactId>

<version>${spring.version}</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-web</artifactId>

<version>${spring.version}</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-webmvc</artifactId>

<version>${spring.version}</version>

</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 {

@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<String, Object> 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）

<websocket:handlers>

<websocket:mapping path="/websocket" handler="websocket"/>

<websocket:handshake-interceptors>

</websocket:handshake-interceptors>

</websocket:handlers>

6 客户端页面

<!DOCTYPE html>

<html>

<head>

<title>WebSocket/SockJS Echo Sample (Adapted from Tomcat's echo sample)</title>

#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>

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>

rely on Javascript being enabled. Please enable

Javascript and reload this page!</h2></noscript>

<div>

<label for="radio1">W3C WebSocket</label>

<br>

<label for="radio2">SockJS</label>

<span>SockJS transport:</span>

<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" onclick="connect();">Connect</button>

<button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button>

</div>

<div>

<textarea id="message" style="width: 350px">Here is a message!</textarea>

</div>

<div>

<button id="echo" onclick="echo();" disabled="disabled">Echo message</button>

</div>

</div>

</body>

</html>

7 按照以上步骤搭建，根据个人开发环境不同，可能会出现各种问题，下面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

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