spring+websocket整合学习笔记

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websocket

传统的B/S通讯方式都是基于客户端主动请求，服务端响应结果。有了websocket技术之后，就可以实现服务端主动向客户端推送数据了。因为websocket是html5的技术，需要支持html5的浏览器，以下例子我使用的是ie11和chrome61，均可以测试通过。
以下是集成spring的websocket例子：
1. pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>cn.gov.zjport.learning.redis</groupId>
  <artifactId>websocket</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>websocket Maven Webapp</name>
  <url>http://maven.apache.org</url>
  
  <properties>
  	<spring-version>4.2.4.RELEASE</spring-version>
  </properties>
  <dependencies>
    <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-websocket</artifactId>
    <version>${spring-version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-messaging</artifactId>
    <version>${spring-version}</version>
</dependency>
<dependency>  
	<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>
<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>2.6.6</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.6.6</version>
</dependency>

  </dependencies>
  <build>
    <finalName>websocket</finalName>
    <plugins>
		<plugin>
			<artifactId>maven-compiler-plugin</artifactId>
			<configuration>
				<source>1.7</source>
				<target>1.7</target>
			</configuration>
		</plugin>
	</plugins>
  </build>
</project>

2. 服务端java代码

package cn.gov.zjport.demo.websocket;

import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;

  
public class WebsocketHandler 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);  
    }  
}

3.spring配置文件
beans.xml(这个文件是为了例子完整性添加的，跟websocket整合无关)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:cache="http://www.springframework.org/schema/cache" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.0.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
       http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-4.0.xsd">
	   <context:annotation-config />
	   <context:component-scan base-package="cn.gov.zjport.demo" />
</beans>

spring-websocket.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:websocket="http://www.springframework.org/schema/websocket"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
           http://www.springframework.org/schema/websocket http://www.springframework.org/schema/websocket/spring-websocket.xsd">

    <websocket:handlers>
        <websocket:mapping path="/springws/myhandler.ws" handler="myHandler" />
	</websocket:handlers>
    <bean id="myHandler" class="cn.gov.zjport.demo.websocket.WebsocketHandler" />
</beans>

4.web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance  http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:/config/beans.xml</param-value>
	</context-param>
	
	 <listener>
   		 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <servlet>
	    <servlet-name>dispatcherServlet</servlet-name>
	    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	    <init-param>
	        <param-name>contextConfigLocation</param-name>
	        <param-value>classpath:config/spring/spring-websocket.xml</param-value>
	    </init-param>
	</servlet>
	<servlet-mapping>
	    <servlet-name>dispatcherServlet</servlet-name>
	    <url-pattern>*.ws</url-pattern>
	</servlet-mapping>
</web-app>

5.客户端html5页面

<!DOCTYPE html>  
<html>  
<head>  
    <title>WebSocket Echo demo</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 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() {
        	updateUrl("/websocket/springws/myhandler.ws");
            alert("url:"+url);  
            ws = 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 (window.location.protocol == 'http:') {  
                 url = 'ws://' + window.location.host + urlPath;  
             } else {  
                 url = 'wss://' + window.location.host + urlPath;  
             }  
        }  
  
        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">  
        <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>

6.访问http://localhost:8080/websocket/websocket.html