websocket通讯实现代码 前端js+后端java spring boot

客户端

<script>
//html5 监听
var websocket =null;
if('WebSocket' in window){
	websocket= new WebSocket('ws://');
}else{
	alert("浏览器不支持websocket");
}

websocket.onopen= function(event){
	console.log('建立连接');
}
websocket.onclose= function(event){
	console.log('关闭连接');
}
websocket.onmessage= function(event){
	console.log('收到消息'+event.data);
}

websocket.onerror= function(event){
	console.log('websocket通讯发生错误');
}
window.onbeforeunload=function () {
	websocket,close();
}

</script>

前端js包外部地址： cdn.bootcss.com

后端

引入依赖

<dependency>
	<groupId>org.springframework.bootgroupId>
	<artifactId>spring-boot-starter-websocketartifactId>
dependency>

配置

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

通常把websocket 类写到 server 层中

@Component
@ServerEndpoint("/webSocket")
@Slf4j
public class WebSocket {

    private Session session;

    private static CopyOnWriteArraySet<WebSocket> webSocketSet = new CopyOnWriteArraySet<>();

    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);
        log.info("【websocket消息】有新的连接, 总数:{}", webSocketSet.size());
    }

    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
        log.info("【websocket消息】连接断开, 总数:{}", webSocketSet.size());
    }

    @OnMessage
    public void onMessage(String message) {
        log.info("【websocket消息】收到客户端发来的消息:{}", message);
    }

    public void sendMessage(String message) {
        for (WebSocket webSocket: webSocketSet) {
            log.info("【websocket消息】广播消息, message={}", message);
            try {
                webSocket.session.getBasicRemote().sendText(message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

在需要发消息的地方发送消息

	@Autowired
    private WebSocket webSocket;

 //发送websocket消息
        webSocket.sendMessage(orderDTO.getOrderId());

学习源码下载地址