spring+websocket整合

將與Spring有關的jar包的版本都升級爲4.0.0以上，並且在web.xml中將<web-app>裏面的version改爲"3.0"

1 在maven的pom.xml中加入websocket所依賴的jar包

<!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>4.3.7.RELEASE</version>
			<scope>test</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>

		<dependency><!-- 加入兩個webscoket的依賴包 -->
			<groupId>org.springframework</groupId>
			<artifactId>spring-websocket</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>
		
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-messaging</artifactId>	
			<version>4.3.7.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>
	
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency> 

2 更新web.xml中namespace.xsd

<web-app   
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
		xmlns="http://java.sun.com/xml/ns/javaee
		http://www.springframework.org/schema/beans"
		xmlns:websocket="http://www.springframework.org/schema/websocket"   
		xsi:schemaLocation="
		http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd
		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" 
        id="WebApp_ID" version="3.1">

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

<servlet>
    <servlet-name>websocketServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:META-INF/spring/websocketmessage-applicationContext.xml</param-value>
    </init-param>
    <async-supported>true</async-supported>
</servlet>
<servlet-mapping>
    <servlet-name>websocketServlet</servlet-name>
    <url-pattern>/websocket/*</url-pattern>
</servlet-mapping>

•  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 {

    @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{

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

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

• 6 客戶端頁面

<!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" onclick="updateUrl(''/spring-websocket-uptest/websocket');">
            <label for="radio1">W3C WebSocket</label>
        <br>
        <input id="radio2" type="radio" name="group1" onclick="updateUrl('/spring-websocket-uptest/websocket');"> 
<!--中間的爲項目名稱-->
            <label for="radio2">SockJS</label>
        <div id="sockJsTransportSelect" style="visibility:hidden;">
            <span>SockJS transport:</span>
            <select onchange="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" 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>
    <div id="console-container">
        <div id="console"></div>
    </div>
</div>
</body>
</html>

原創出處：http://blog.csdn.net/gisredevelopment/article/details/38392629

http://blog.csdn.net/zhangbojun888/article/details/41593225