springboot整合websocket实现一对一消息推送和广播消息推送

Posted 2020-10-14 bky_lzw

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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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