none

while(true){
    try (SocketChannel channel = SocketChannel.open()) {
        for(;;){
            //тут отправляешь и получаешь данные
        }
    }catch (IOException e) {
        if (attNum < 8) {
            System.out.printf("No server connection. Trying to connect: committed %d/8 attempts.\n", attNum);
            attNum++;
                try {
                    System.out.println("Connecting...");
                    Thread.sleep(2000);
                } catch (InterruptedException ex) {}
        } else {
            System.out.println("No server connection. The available number of attempts has been exhausted.");
            //завершаешь работу клиента
        }
   }
}