1.引入依赖

1.1 引入websocket依赖
1.2 引入thymeleaf模板引擎依赖

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

2.webSocket配置类

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketStompConfig implements WebSocketMessageBrokerConfigurer {

    // 设置socket连接
    @Override
    public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {
        stompEndpointRegistry.addEndpoint("/testSocket")
                //.setAllowedOrigins("*") 
                //解决跨域问题
                .setAllowedOriginPatterns("*")
                .withSockJS();
    }

    // 设置发布订阅的主题
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.enableSimpleBroker("/topic", "/top");
    }


}

2.1配置说明：
前端与后台服务建立连接的路径，如：http://localhost:8080/testSocket

stompEndpointRegistry.addEndpoint("/testSocket")

连接的路由配置，只有以topic或者top开头的路径才会被订阅

registry.enableSimpleBroker("/topic", "/top");

3.应用控制器

@Controller
public class WebsocketController {

    @Autowired
    private SimpMessagingTemplate simpMessagingTemplate;

    /**
     * 服务端想客户端发送消息
     */
    @RequestMapping("/send01")
    @ResponseBody
    public String send() {
        // 订阅主题，只有订阅了这个主题的连接才会接收消息
        String topic = "/topic/businessUserId/162";
        // 消息内容
        String message = "你好呀";
        simpMessagingTemplate.convertAndSend(topic, message);
        return "调用成功！";
    }

    /**
     * 客户端向客户端发送消息
     */
    @MessageMapping("/test")
    @SendTo("/topic/businessUserId/162")
    @ResponseBody
    public String call(String msg) {
        System.out.println(msg);
        return msg;
    }

    @RequestMapping("/socketPage")
    public String socketPage() {
        return "socket";
    }

}

4.前端HTML文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>webSocket</title>
</head>
<body>
<div>
    <h2>Socket 网络实时交互测试</h2>
    <div>
        <button id="connect" onclick="connect();">建立连接</button>
        <button id="disconnect" disabled="disabled" onclick="disconnect();">断开连接</button>
    </div>
    <div id="conversationDiv">
        <label>What is your name?</label>
        <input type="text" id="name" />
        <button id="sendName" onclick="sendName();">Send</button>
        <p id="response"></p>
    </div>
</div>
</body>
<script src="http://cdn.bootcss.com/sockjs-client/1.1.1/sockjs.min.js"></script>
<script src="http://cdn.bootcss.com/stomp.js/2.3.3/stomp.js"></script>
<script src="http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js"></script>
<script type="text/javascript">
    var stompClient = null;

    $(function(){
        connect();
    });

    function setConnected(connected) {
        $("#connect").attr("disabled", connected);
        $("#disconnect").attr("disabled", !connected);
        if (connected) {
            $("#conversationDiv").show();
        }else{
            $("#conversationDiv").hide();
        }
        $("#response").html("");
    }

    //this line.
    function connect() {
        var socket = new SockJS("http://localhost:8080/testSocket");
        stompClient = Stomp.over(socket);
        stompClient.connect({}, function(frame) {
            setConnected(true);
            // console.log('Connected: ' + frame);
            // stompClient.subscribe('/top/test', function(frame){
            stompClient.subscribe('/topic/businessUserId/162', function(frame){
                //showGreeting(JSON.parse(greeting.body).content);
                console.info(frame);
                showGreeting(frame.body);
            });
        });
    }

    function sendName() {
        var name = $("#name").val();
        stompClient.send("/test", {}, name);
    }

    function disconnect() {
        if (stompClient != null) {
            stompClient.disconnect();
        }
        setConnected(false);
        console.log("Disconnected");
    }

    function showGreeting(message) {
        $("#response").append("<tr><td>" + message + "</td></tr>");
    }
</script>
</html>