我不能通过套接字发送写操作，而不要反复写它

Question

我想通过BufferedWritter写入数据，一切正常，但是我无法在需要时发送它，如果我在while（true）部分中重复发送而不跳过循环，它就可以正常工作。

如您所见，我想发送sendData（“ 000”），但它不会发送（代码正在运行），但是当我跳过if和but sendData进入while并重复发送时，发送了它。 / p>

public class Connection {

public Socket connection;
public BufferedReader is;
public BufferedWriter os;
public long logged;
public Server server;
public Connection(Server server, Socket connection) {
    this.connection = connection;
    this.server = server;
    resetStream();
    try {
        String s = is.readLine();
        if(!s.equals(Main.version)) {
            connection.close();
            is.close();
            os.close();
            System.out.println(connection.getRemoteSocketAddress().toString()+" sai phien ban");
            return;
        }
        System.out.println(connection.getRemoteSocketAddress().toString()+" da ket noi voi phien ban "+s);
    } catch (IOException e) {
        e.printStackTrace();
    }
    logged = System.currentTimeMillis();
    inputListener();
}

public void inputListener() {
    new Thread() {
        public void run() {
            while(true) {
                try {
                    String cmd = is.readLine();
                    if(cmd == null) continue;
                    System.out.println("["+connection.getRemoteSocketAddress()+"] "+cmd);
                    if(cmd.split(" ")[0].equals("REGISTER")) {
                        if(server.database.registerUser(cmd.replace("REGISTER ","")) == 1)
                        System.out.println("["+connection.getRemoteSocketAddress()+"] da dang ky thanh cong voi user "+cmd.replace("REGISTER ",""));
                        else sendData("000");
                    }

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }.start();
}

public void sendData(String string) {
    try {
        os.write(string);
        os.newLine();
        os.flush();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void resetStream() {
    try {
        if(os != null) os.close();
        if(is != null) is.close();
        is = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        os = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
    } catch (IOException e) {
        e.printStackTrace();
    }
}

}