springMVC+spring+MyBatis+websocket技術整合

阿新 • • 發佈：2019-01-31

websocket是目前唯一真正實現全雙工通訊的伺服器向客戶端推的網際網路技術，與長連線和輪詢技術相比，websocket的優越性不言自明，長連線的連線資源（執行緒資源）隨著連線數量的增多，必會耗盡，客戶端輪詢會給伺服器造成很大的壓力，而websocket是在物理層非網路層建立一條客戶端至伺服器的長連線，以此來保證伺服器向客戶端的即時推送，既不耗費執行緒資源，又不會不斷向伺服器輪詢請求。

下面言歸正傳，講一講SSM（springMVC+spring+MyBatis）框架中整合websocket技術的曲折蛋疼直至成功喜悅之路。

1 在maven的pom.xml中加入websocket所依賴的jar包，什麼，你不知道maven，快去度之或者檢視擼主關於maven的博文惡補一下，spring-websocket所依賴的jar包有以下幾個：

    <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

<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）

<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 建立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);  
    }  
}

5 建立握手（handshake）介面

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);  
    }  
  
}

6 處理類和握手協議的spring配置(applicationContext.xml檔案）

<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>

7 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');">  
            <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>

7 按照以上步驟搭建，根據個人開發環境不同，可能會出現各種問題

org.apache.tomcat.websocket.server.WsServerContainer cannot be cast to javax.websocket.server

    嚴重: Servlet.service() for servlet [SpringMVC] in context with path [/ZHDM] threw exception [Request processing failed; nested exception is org.springframework.web.socket.server.HandshakeFailureException: Uncaught failure for request http://125.221.225.118:8080/ZHDM/websocket; nested exception is java.lang.ClassCastException: org.apache.tomcat.websocket.server.WsServerContainer cannot be cast to javax.websocket.server.ServerContainer] with root cause  
    java.lang.ClassCastException: org.apache.tomcat.websocket.server.WsServerContainer cannot be cast to javax.websocket.server.ServerContainer  
        at org.springframework.web.socket.server.standard.AbstractStandardUpgradeStrategy.getContainer(AbstractStandardUpgradeStrategy.java:76)  
        at org.springframework.web.socket.server.standard.TomcatRequestUpgradeStrategy.getContainer(TomcatRequestUpgradeStrategy.java:85)  
        at org.springframework.web.socket.server.standard.TomcatRequestUpgradeStrategy.getContainer(TomcatRequestUpgradeStrategy.java:47)  
        at org.springframework.web.socket.server.standard.AbstractStandardUpgradeStrategy.getSupportedExtensions(AbstractStandardUpgradeStrategy.java:68)  
        at org.springframework.web.socket.server.support.DefaultHandshakeHandler.doHandshake(DefaultHandshakeHandler.java:206)  
        at org.springframework.web.socket.server.support.WebSocketHttpRequestHandler.handleRequest(WebSocketHttpRequestHandler.java:120)  
        at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:51)  
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)  
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)  
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)  
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)  
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)  
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)  
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)  
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)  
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)  
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)  
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)  
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)  
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)  
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)  
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)  
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)  
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)  
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)  
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)  
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)  
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)  
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)  
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)  
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)  
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015)  
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)  
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)  
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2451)  
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2440)  
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)  
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)  
        at java.lang.Thread.run(Thread.java:744)

解決方案：
出現這個問題的原因是，apache的websocket包和javax-servlet包衝突了，找到Apache Tomcat的webApp目錄，開啟你部署的專案資料夾，依次開啟WEB-INF/lib，找到javaee-api-7.0.jar，刪除，再重新啟動專案。

轉自【http://blog.csdn.net/gisredevelopment/article/details/38392629】

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