SpringBoot搭建WebSocket初始化

1.java后端的maven添加websocket依赖

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

2.实例化ServerEndpointExporter对象，
这样才能自动调用@ServerEndpoint(“/test”)里面的方法

@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter(){
        return new ServerEndpointExporter();
    }
}

3.创建一个类，该类的功能是提供websocket服务

/**
 * websocket服务
 */
@Component
@ServerEndpoint("/test")
public class WebsocketServer{

    @OnOpen
    public void onOpen(Session session, EndpointConfig endpointConfig) {
        System.out.println("websocket已连接");
    }

    @OnClose
    public void onClose(Session session, CloseReason closeReason) {
        System.out.println("websocket已关闭");
    }

    @OnError
    public void onError(Session session, Throwable throwable) {
        System.out.println("连接错误"+throwable);
    }
    //发送
    @OnMessage
    public void onMessage(String message,Session session){
        System.out.println("接收到消息：" + message);

        try {
            session.getBasicRemote().sendText("回应: " + message);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

前端测试发起请求连接websocket
创建了一个html,控制台输出结果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var ws=new WebSocket("ws://localhost:8080/test");
        ws.onopen=function(){
            console.log("连接成功");
            ws.send('6666');
        }
        ws.onclose=function(){
            console.log("连接关闭");
        }
        ws.onmessage=function(res){
            console.log(res);
        }
        ws.onerror=function(res){
            console.log(res);
        }
    </script>
</body>
</html>