• springboot整合websocket实现一对一消息推送和广播消息推送


    maven依赖

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-websocket</artifactId>
    </dependency>

    常量类

    //webSocket相关配置
    //链接地址
    public static String WEBSOCKETPATHPERFIX = "/ws-push";
    public static String WEBSOCKETPATH = "/endpointWisely";
    //消息代理路径
    public static String WEBSOCKETBROADCASTPATH = "/topic";
    //前端发送给服务端请求地址
    public static final String FORETOSERVERPATH = "/welcome";
    //服务端生产地址,客户端订阅此地址以接收服务端生产的消息
    public static final String PRODUCERPATH = "/topic/getResponse";
    //点对点消息推送地址前缀
    public static final String P2PPUSHBASEPATH = "/user";
    //点对点消息推送地址后缀,最后的地址为/user/用户识别码/msg
    public static final String P2PPUSHPATH = "/msg";

    接收前端消息实体

    public class WiselyMessage {
        private String name;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    }

    后台发送消息实体

    private String responseMessage;
    
    public WiselyResponse(String responseMessage){
        this.responseMessage = responseMessage;
    }
    
    public String getResponseMessage() {
        return responseMessage;
    }
    
    public void setResponseMessage(String responseMessage) {
        this.responseMessage = responseMessage;
    }

    配置websocket

    @Configuration
    // @EnableWebSocketMessageBroker注解用于开启使用STOMP协议来传输基于代理(MessageBroker)的消息,这时候控制器(controller)
    // 开始支持@MessageMapping,就像是使用@requestMapping一样。
    @EnableWebSocketMessageBroker
    public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
    
        @Override
        public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
            //注册一个Stomp的节点(endpoint),并指定使用SockJS协议。
            stompEndpointRegistry.addEndpoint(Constant.WEBSOCKETPATH).withSockJS();
        }
    
        @Override
        public void configureMessageBroker(MessageBrokerRegistry registry) {
            //服务端发送消息给客户端的域,多个用逗号隔开
            registry.enableSimpleBroker(Constant.WEBSOCKETBROADCASTPATH, Constant.P2PPUSHBASEPATH);
            //定义一对一推送的时候前缀
            registry.setUserDestinationPrefix(Constant.P2PPUSHBASEPATH);
            //定义websoket前缀
            registry.setApplicationDestinationPrefixes(Constant.WEBSOCKETPATHPERFIX);
        }
    }

    service

    @Service
    public class WebSocketService {
    
        @Autowired
        private SimpMessagingTemplate template;
    
        /**
         * 广播
         * 发给所有在线用户
         *
         * @param msg
         */
        public void sendMsg(WiselyResponse msg) {
            template.convertAndSend(Constant.PRODUCERPATH, msg);
        }
    
        /**
         * 发送给指定用户
         * @param users
         * @param msg
         */
        public void send2Users(List<String> users, WiselyResponse msg) {
            users.forEach(userName -> {
                template.convertAndSendToUser(userName, Constant.P2PPUSHPATH, msg);
            });
        }
    }

    控制器

    @Controller
    public class WsController {
    
        @Resource
        WebSocketService webSocketService;
    
        @MessageMapping(Constant.FORETOSERVERPATH)//@MessageMapping和@RequestMapping功能类似,用于设置URL映射地址,浏览器向服务器发起请求,需要通过该地址。
        @SendTo(Constant.PRODUCERPATH)//如果服务器接受到了消息,就会对订阅了@SendTo括号中的地址传送消息。
        public WiselyResponse say(WiselyMessage message) throws Exception {
            List<String> users = Lists.newArrayList();
            users.add("d892bf12bf7d11e793b69c5c8e6f60fb");//此处写死只是为了方便测试,此值需要对应页面中订阅个人消息的userId
            webSocketService.send2Users(users, new WiselyResponse("admin hello"));
    
            return new WiselyResponse("Welcome, " + message.getName() + "!");
        }
    }

    页面

    <!DOCTYPE html>
    <html xmlns:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8" />
        <title>Spring Boot+WebSocket+广播式</title>
    
    </head>
    <body onload="disconnect()">
    <noscript><h2 style="color: #ff0000">貌似你的浏览器不支持websocket</h2></noscript>
    <div>
        <div>
            <button id="connect" onclick="connect();">连接</button>
            <button id="disconnect" disabled="disabled" onclick="disconnect();">断开连接</button>
        </div>
        <div id="conversationDiv">
            <label>输入你的名字</label><input type="text" id="name" />
            <button id="sendName" onclick="sendName();">发送</button>
            <p id="response"></p>
            <p id="response1"></p>
        </div>
    </div>
    <!--<script th:src="@{sockjs.min.js}"></script>
    <script th:src="@{stomp.min.js}"></script>
    <script th:src="@{jquery.js}"></script>-->
    <script src="https://cdn.bootcss.com/sockjs-client/1.1.4/sockjs.min.js"></script>
    <script src="https://cdn.bootcss.com/stomp.js/2.3.3/stomp.min.js"></script>
    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
    <script th:inline="javascript">
        var stompClient = null;
        //此值有服务端传递给前端,实现方式没有要求
        var userId = [[${userId}]];
    
        function setConnected(connected) {
            document.getElementById('connect').disabled = connected;
            document.getElementById('disconnect').disabled = !connected;
            document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
            $('#response').html();
        }
    
        function connect() {
            var socket = new SockJS('/endpointWisely'); //1连接SockJS的endpoint是“endpointWisely”,与后台代码中注册的endpoint要一样。
            stompClient = Stomp.over(socket);//2创建STOMP协议的webSocket客户端。
            stompClient.connect({}, function(frame) {//3连接webSocket的服务端。
                setConnected(true);
                console.log('开始进行连接Connected: ' + frame);
                //4通过stompClient.subscribe()订阅服务器的目标是'/topic/getResponse'发送过来的地址,与@SendTo中的地址对应。
                stompClient.subscribe('/topic/getResponse', function(respnose){
                    showResponse(JSON.parse(respnose.body).responseMessage);
                });
                //4通过stompClient.subscribe()订阅服务器的目标是'/user/' + userId + '/msg'接收一对一的推送消息,其中userId由服务端传递过来,用于表示唯一的用户,通过此值将消息精确推送给一个用户
                stompClient.subscribe('/user/' + userId + '/msg', function(respnose){
                    console.log(respnose);
                    showResponse1(JSON.parse(respnose.body).responseMessage);
                });
            });
        }
    
    
        function disconnect() {
            if (stompClient != null) {
                stompClient.disconnect();
            }
            setConnected(false);
            console.log("Disconnected");
        }
    
        function sendName() {
            var name = $('#name').val();
            //通过stompClient.send()向地址为"/welcome"的服务器地址发起请求,与@MessageMapping里的地址对应。因为我们配置了registry.setApplicationDestinationPrefixes(Constant.WEBSOCKETPATHPERFIX);所以需要增加前缀/ws-push/
            stompClient.send("/ws-push/welcome", {}, JSON.stringify({ 'name': name }));
        }
    
        function showResponse(message) {
            var response = $("#response");
            response.html(message);
        }
        function showResponse1(message) {
            var response = $("#response1");
            response.html(message);
        }
    </script>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/bky-lzw/p/7814326.html
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