spring+websocket綜合（springMVC+spring+MyBatis這是SSM框架和websocket集成技術）

時間  2020-06-03
標籤 spring+websocket spring websocket 綜合 springmvc+spring+mybatis springmvc mybatis 這是 ssm 框架 集成 技術 欄目 Spring 简体版
原文   原文鏈接

java-websocket該建築是easy。兒童無用的框架能夠在這裏下載主線和我的教學好java-websocket計劃：javascript

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

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


spring4.0之後增長了對websocket技術的支持，擼主眼下的項目用的是SSM（springMVC+spring+MyBatis）框java

架，所以確定要首選spring自帶的websocket了，好，現在問題來了，擼主在網上各類狂搜猛找，拼湊了幾個自稱是git

spring websocket的東東。下來一看，廢物。當中包含從github上down下來的。舉個樣例。在搭建過程當中有個問題，github

擼主上谷歌搜索，總共搜出來三頁結果共30條左右，前15條是純英文的  後15條是韓語和日語，而這30條結果都不能web

解決擼主的問題，無奈，僅僅好上官網看全英幫助，在擼主驚人的毅力和不懈奮鬥下。糾結了兩天的spring+websocketspring

整合今天算是完全搭建成功，摸索透徹了。json

websocket是眼下惟一真正實現全雙工通訊的server向client推的互聯網技術，與長鏈接和輪詢技術相比，api

websocket的優越性不言自明，長鏈接的鏈接資源（線程資源）隨着鏈接數量的增多。必會耗盡。client輪詢會給服

務器形成很是大的壓力，而websocket是在物理層非網絡層創建一條client至server的長鏈接，以此來保證server向客

戶端的即時推送，既不耗費線程資源，又不會不斷向server輪詢請求。

如下言歸正傳，講一講擼主在SSM（springMVC+spring+MyBatis）框架中集成websocket技術的曲折蛋疼直至成功喜悅之路。

  • 1 在maven的pom.xml中增長websocket所依賴的jar包，什麼，你不知道maven，快去度之或者查看擼主關於maven的博文惡補一下，spring-websocket所依賴的jar包有下面幾個：

<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的版本號。

<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  4.1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);
	}
}

  • 4.2建立握手（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.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>


  • 6 client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  依照以上步驟搭建，依據我的開發環境不一樣。可能會出現各類問題，如下將在整個搭建過程當中遇到的問題總結一下，詳見博文：http://blog.csdn.net/gisredevelopment/article/details/38397569



演示實例加強版下載：spring-websocket-uptest.rar

尊重原創。轉載請註明出處：

http://blog.csdn.net/gisredevelopment/article/details/38392629


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