java - websocket api开发客户端如何保持链接不断开，在没有数据传输的时候

Question

最近用java websocket开发的客户端程序，在和服务端链接通后，在数据传输完毕后，客户端自动关闭了链接，如何能保持链接不断开

这个是客户端的启动类，在循环完毕后，会自动断开和服务器的链接，开始怀疑是session超时问题，然后设置了下maxsession，却依然在没有数据传输后立刻断开了链接

public class ClientStart {
    public static void main(String[] args){
        try {
            WebSocketContainer container = ContainerProvider.getWebSocketContainer();
            MyClient client = new MyClient();
            container.connectToServer(client, new URI("ws://localhost:8088/websocket"));
//            container.setDefaultMaxSessionIdleTimeout(5000L);
            int turn = 0;
            while(turn++ < 10){
                client.send("client send: " + turn);
                Thread.sleep(1000);
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

MyClient也放上去吧：

@ClientEndpoint
public class MyClient {
    private static Logger logger = LoggerFactory.getLogger(MyClient.class);
    private Session session;
    @OnOpen
    public void open(Session session){
        logger.info("Client WebSocket is opening...");
        this.session = session;
    }

    @OnMessage
    public void onMessage(String message){
        logger.info("Server send message: " + message);
    }

    @OnClose
    public void onClose(){
        logger.info("Websocket closed");
    }

    /**
     * 发送客户端消息到服务端
     * @param message 消息内容
     */
    public void send(String message){
        this.session.getAsyncRemote().sendText(message);
    }
}

Answer 1

new CountDownLatch(1).await();

Answer 2

After sending the message according to your logic loop, the process will exit. It is normal for the connection to be disconnected.

public class ClientStart {
    public static void main(String[] args){
        try {
            WebSocketContainer container = ContainerProvider.getWebSocketContainer();
            MyClient client = new MyClient();
            container.connectToServer(client, new URI("ws://localhost:8088/websocket"));
//            container.setDefaultMaxSessionIdleTimeout(5000L);
            int turn = 0;
            while(turn++ < 10){
                client.send("client send: " + turn);
                Thread.sleep(1000);
            }
            
            //
            // wait/sleep
            //
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

Answer 3

Make sure that your main thread never exits, such as the spring mvc web framework, or a blocked queue. If there is no message, it will always be blocked to ensure that the main thread will not exit. Thread.sleep(1000); You can try to adjust this to 1h to simulate a program that never exits