无法从Java TCP服务器接收数据

Question

在服务器上，当我得到一个新的连接（ serverSocket.accept() ）时，我将该连接套接字传递给一个名为ServerPlayer.java的类的实例，该类从线程扩展。

我还创建了一个OutputObjectStream和一个InputObjectStream并将它们传递给新的ServerPlayer实例，然后将ServerPlayer实例添加到ArrayList中以跟踪它们。

当我在新的ServerPlayer上调用start()时，我让它写入了一个字节（1）。

然后，我让我的客户端运行一个侦听线程，该线程侦听来自TCP Server的传入数据。 但是，我没有收到服务器发送的（1）。 我不确定服务器只是没有正确发送它还是客户端没有正确接收它...

ServerPlayer.java：

    /**
     * ServerPlayer.java
     * Creates a new instance of a player on the server, gives it
     * an output and input stream, as well as the socket it came in on
     */
    package server;

    import java.io.IOException;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.net.Socket;
    import java.util.logging.Level;
    import java.util.logging.Logger;

    public class ServerPlayer extends Thread {
        UIServer ui;
        Socket socket;
        ObjectOutputStream os;
        ObjectInputStream is;


        int id = -1;
        ServerPlayer(Socket socket, ObjectOutputStream os, ObjectInputStream is, UIServer ui){
            this.socket = socket;
            this.os = os;
            this.is = is;
            this.ui = ui;
        }

        public void setID(int id){
            this.id = id;
        }

        public int getID(){
            return this.id;
        }

        public void run(){
            boolean keepGoing = true;
            System.out.println("SERVERPLAYER THREAD START");
            try {
                os.writeByte(1);
                System.out.println("sent byte 1 from server");
            } catch (IOException ex) {
                Logger.getLogger(ServerPlayer.class.getName()).log(Level.SEVERE, null, ex);
            }
            while(keepGoing){
                try{
                    Byte msg = is.readByte();
                    int mes_id = msg.intValue();
                    ui.console.println("SERV MESSAGE#: " + mes_id);

                } catch (IOException ex) {
                    Logger.getLogger(ServerPlayer.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }

ListenFromServer.Java：

    /*
     * ListenFromServer.java
     * Listens for incoming data from the TCP Server (this is on the client side)
     */
    package client;

    import java.io.IOException;
    import java.util.logging.Level;
    import java.util.logging.Logger;

    public class ListenFromServer extends Thread {
        TCPClient client;
        boolean isRunning = false;
        public ListenFromServer(TCPClient client){
            this.client = client;
        }
        public void run(){
            System.out.println("listen from server thread start");
            isRunning = true;
            while(isRunning){

                try {
                    Byte b = client.sInput.readByte();
                    client.ui.console.println("BYTE: " + b.intValue());
                } catch (IOException ex) {
                    Logger.getLogger(ListenFromServer.class.getName()).log(Level.SEVERE, null, ex);
                }

            }
        }
    }

Answer 1

尝试更改为

os.writeByte(1);
os.flush();