Java websocket - 立即关闭连接

时间:2016-11-06 19:05:08

标签: java websocket

在我的java websocket中,我想在建立之后立即关闭连接。

服务器

@ServerEndpoint(value = "/server") 
public class Server {
private static final long serialVersionUID = 1L;
private Session session;

@OnOpen
public void onOpen(Session session) throws IOException {
    System.out.println("Server Websocket open");
    this.session = session;
    try {
        session.close(new CloseReason(CloseCodes.NORMAL_CLOSURE, "No Token"));
    } catch (IOException e) {
        e.printStackTrace();
    }

}


@OnMessage
public void onMessage(String message) {
    System.out.println("server receives: "+message);
}

@OnClose
public void onClose(Session session) {
    System.out.println("Server session closed");
    session = null;
}

客户端

@ClientEndpoint 
public class Client {

public static void main(String[] args) {

    WebSocketContainer container = null;

    container = ContainerProvider.getWebSocketContainer();
    try {
        Session session = container.connectToServer(Client.class, URI.create("ws://localhost:8080/WebsocketServer/server"));
    } catch (DeploymentException | IOException e) {
        e.printStackTrace();
    }

}

@OnOpen
public void onOpen(Session p) {
    try {
        for (int i = 0; i < 10; i++) {
            p.getBasicRemote().sendText("Hello! ");

            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
        p.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

@OnClose
public void OnClose() {
    System.out.println("Client connection closed");
}

虽然在服务器类的onOpen方法中已关闭连接,但它仍然从客户端接收消息。

server receives: Hello! 
server receives: Hello! 
server receives: Hello! 
server receives: Hello! 
...

为什么连接仍然打开并接收消息,尽管已经调用了close方法?

1 个答案:

答案 0 :(得分:1)

因为正常关闭ws连接是一个异步过程。您的服务器发送关闭消息,但在服务器收到客户端的关闭回复之前,连接不会关闭。鉴于您的观察结果,客户很可能已经发送了10&#39; Hello!&#39;甚至在它开始处理来自服务器的关闭消息之前的消息。因此,就服务器而言,连接仍然是开放的,这就是为什么它打印服务器接收&#34;消息。