我正在创建一个简单的Java程序，该程序在启动时会创建两个线程，这些线程中的每个线程都会创建一个侦听不同端口（即端口5500、5100）的服务器，这些服务器各有一个客户端，现在我希望这些服务器能够能够将信息从他们的客户彼此传递。我怎么做。这是我用于服务器的代码

class SocketSeverBrooker extends Thread{
    int portNumber = 5500;
    ServerSocket serverSocket = null;
    int clientID = 10000;


    public void run(){

        try {
            serverSocket = new ServerSocket(portNumber);


            while(true){
                try{
                    // i am accepting acconection from a client
                    Socket clientsocket = serverSocket.accept();
                    new Thread(new BrokerRunnable(clientsocket)).start();
                    System.out.println("a broker has connected with id "+ clientID);
                    clientID++;
                }catch(IOException e){
                    System.out.println("client could not connect");
                }

            }

        }catch (IOException e){
            System.out.println("could not create a connection");
        }

    }
}

class BrokerRunnable implements Runnable{

  protected Socket clientsocket;


    public BrokerRunnable(Socket clientsocket) {
        this.clientsocket = clientsocket;
    }

    public void run() {
        // create two way communication
       // this is used to get input from the connected client clientsocket.getInputStream()

        // new BufferedReader();

        try{

            BufferedReader in = new BufferedReader(new InputStreamReader(clientsocket.getInputStream()));
            PrintWriter out = new PrintWriter(clientsocket.getOutputStream(),true);// write the sever
            String arg1;
            arg1 = in.readLine();
            System.out.println( arg1);
            Scanner scanner = new Scanner(System.in);
            String msgToBrokker = scanner.nextLine();
            out.println(msgToBrokker);


        }catch(IOException e){
            System.out.println("could not read");
        }

    }
}