java - Kryonet连接成功但收不到消息

Question

您好，我正在使用 Kryonet 作为我正在开发的游戏的网络库。

我在服务器端有这个代码:

public class MyServer {
    Kryo kryo;
    Server server;
    Connection connection;
    public MyServer(){
        server = new Server();
        server.start();
        try {
            server.bind(59990, 59900);
        } catch (IOException e) {
            System.out.println("FATAL ERROR");
        }

        kryo = server.getKryo();
        kryo.register(Message.class);

        server.addListener(new Listener() {
            public void received (Connection con, Message str) {
                System.out.println("Message recieved from client to server");
                Message m = (Message)str;
                System.out.println(m.text);

            }
            public void connected(Connection con){
                System.out.println("Hey, we are connected!");
                connection = con;
                con.sendTCP("HOLA CLIENTE!!");
            }
            public void disconnected(Connection con){
                System.out.println(":( He is gone... he'll never come back..");
            }
        });

    }

    public void sendMessage(String tipoMensaje,String tipoTropa,String id){
        connection.sendTCP(tipoMensaje+"-"+tipoTropa+"-"+id);
    }

}

在客户端:

public class MyClient {
    Client client;
    Connection connection;
    Kryo kryo;
    public MyClient(){
        client = new Client();
        client.start();


        try {
            kryo = client.getKryo();
            kryo.register(Message.class);

            client.connect(5000, "10.211.55.3", 59990, 59900);
            //sendMessage("fromclient","ee","ee");

            client.addListener(new Listener() {
                public void received (Connection con, String str) {
                      System.out.println(str);

                      System.out.println("Message recieved from server to client");
                }
                public void connected(Connection con){
                    System.out.println("Hey, we are connected!");
                    connection = con;
                    Message m = new Message();
                    m.text="eeep";
                    client.sendTCP(m);
                }
                public void disconnected(Connection con){
                    System.out.println(":( He is gone... he'll never come back..");
                }
            });


        } catch (IOException e) {
            System.out.println("Error while connecting");
        }   


    }


    public void sendMessage(String tipoMensaje,String tipoTropa,String id){
        client.sendTCP(tipoMensaje+"-"+tipoTropa+"-"+id);
        System.out.println("Message sent from client to server");

    }
}

Message 只是一个包含字符串的类。当我尝试将客户端连接到服务器时，我收到“嘿，我们已连接!”消息，然后在服务器的命令行中显示“从客户端到服务器收到的消息”。但是，m.text(消息内容)没有打印，我不知道为什么。

提前致谢。

Answer 1

这是因为监听器中没有方法 public void returned (Connection con, String str) - 基本上，您的服务器永远不会调用它。这也是您应该使用 @Override 的原因 - 您一开始就不会遇到此问题。

将String str替换为Object o。然后 - 检查您的对象是否实际上是一个 Message。如果是，则将其转换为 Message 并打印出其文本。您的方法应如下所示:

@Override
public void received(Connection connection, Object packet) {
    if (packet instanceof Message) {
        System.out.println(((Message) packet).text);
    }
}