spring集成web socket小demo（demo1）
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参考：http://blog.csdn.net/ouyang111222/article/details/50545411
http://blog.csdn.net/gisredevelopment/article/details/38392629/
1.导入：
公司erp中有个好玩的功能，就是当销售在保存客户的时候，一旦库中有这个客户，这个时候就会给这个客户的创建人发送一个类似站内信的小弹窗，提示他这个客户刚刚被查看过，看了一下代码发现用的是websocket，这两天于是顺带看了一点websocket、长连接短连接以及轮询相关的定义，关于这部分我写了一个简单的介绍：
2.代码：
2.1.maven中pom依赖：
<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>关于这一块，公司代码里面使用了jdk1.8，同时还加入了javax.websocket和tomcat-embed-websocket等依赖，我觉得没有必要，也可能是有其他用途，等我后续研究再说；
2.2.在spring的配置文件中假如websocket的dtd约束：
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"xmlns:websocket="http://www.springframework.org/schema/websocket" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/websocket http://www.springframework.org/schema/websocket/spring-websocket.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd"default-autowire="byName">我的项目是ssm的，东西有点多，具体看标蓝部分即可；
2.3.新建WebsocketEndPoint类和HandshakeInterceptor类
WebsocketEndPoint
public class WebsocketEndPoint extends TextWebSocketHandler {private static final ArrayList<WebSocketSession> users = new ArrayList<WebSocketSession>();private static final Logger logger = LoggerFactory.getLogger(WebsocketEndPoint.class);/** * after connection establish */public void afterConnectionEstablished(WebSocketSession session)throws Exception {logger.info("connect success...");users.add(session);}@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);}@Overridepublic void handleTransportError(WebSocketSession webSocketSession,Throwable throwable) throws Exception {if (webSocketSession.isOpen()) {webSocketSession.close();}logger.info("connenction error,close the connection...");users.remove(webSocketSession);}@Overridepublic void afterConnectionClosed(WebSocketSession webSocketSession,CloseStatus closeStatus) throws Exception {logger.info("close the connenction..." + closeStatus.toString());users.remove(webSocketSession);}@Overridepublic boolean supportsPartialMessages() {return false;}@Overridepublic void handleMessage(WebSocketSession webSocketSession,WebSocketMessage<?> webSocketMessage) throws Exception {sendMessageToUsers(new TextMessage(webSocketMessage.getPayload()+ "hello"));}/** * 给所有在线用户发送消息 * * @param message */public void sendMessageToUsers(TextMessage message) {for (WebSocketSession user : users) {try {if (user.isOpen()) {user.sendMessage(message);}} catch (IOException e) {e.printStackTrace();}}}}HandshakeInterceptor
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); } }2.4：注册到spring中：
<!-- 处理类和握手协议的spring配置 --><bean id="websocket" class="com.lujx.websocket.WebsocketEndPoint" /><websocket:handlers><websocket:mapping path="/websocket" handler="websocket" /><websocket:handshake-interceptors><bean class="com.lujx.websocket.HandshakeInterceptor" /></websocket:handshake-interceptors></websocket:handlers>
2.5.编写前端页面，新建websocket.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <html> <head lang="en"> <meta charset="UTF-8"> <script src="http://cdn.sockjs.org/sockjs-0.3.min.js"></script> <!-- 新 Bootstrap 核心 CSS 文件 --> <link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css"> <!-- 可选的Bootstrap主题文件（一般不用引入） --> <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap-theme.min.css"> <!-- jQuery文件。务必在bootstrap.min.js 之前引入 --> <script src="http://cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script> <!--<script type="text/javascript" src="js/jquery-1.7.2.js"></script>--> <!-- 最新的 Bootstrap 核心 JavaScript 文件 --> <script src="http://cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> <title>webSocket测试</title> <script type="text/javascript"> $(function(){ var websocket; if ('WebSocket' in window) { alert("WebSocket"); websocket = new WebSocket("ws://localhost:8080/springDemo/websocket"); //标蓝为自己项目名称 } else if ('MozWebSocket' in window) { alert("MozWebSocket"); websocket = new MozWebSocket("ws://echo"); } else { alert("SockJS"); websocket = new SockJS("http://localhost:8080/springDemo/sockjs/websocket");//自己项目名称 } websocket.onopen = function (evnt) { $("#tou").html("链接服务器成功!") }; websocket.onmessage = function (evnt) { $("#msg").html($("#msg").html() + "<br/>" + evnt.data); }; websocket.onerror = function (evnt) { }; websocket.onclose = function (evnt) { $("#tou").html("与服务器断开了链接!") } $('#send').bind('click', function() { send(); }); function send(){ if (websocket != null) { var message = document.getElementById('message').value; websocket.send(message); } else { alert('未与服务器链接.'); } } }); </script> </head> <body> <div class="page-header" id="tou"> webSocket及时聊天Demo程序 </div> <div class="well" id="msg"> </div> <div class="col-lg"> <div class="input-group"> <input type="text" class="form-control" placeholder="发送信息..." id="message"> <span class="input-group-btn"> <button class="btn btn-default" type="button" id="send" >发送</button> </span> </div><!-- /input-group --> </div><!-- /.col-lg-6 --> </body> </html>最终结果：浏览器访问：http://localhost:8080/springDemo/websocket.jsp 出现链接服务器成功；发送消息后，有消息返回到上面
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