java - 如何为PrintWriter设置TimerTask？

Question

我使用 TimerTask 每 3 秒发送消息，但只发送一次。

 public static void main(String[] args) throws IOException {
            soc = new Socket("localhost", 12345);
            out = new PrintWriter(soc.getOutputStream(), true);
            send();
        }
        private static void send() {
            Timer timer = new Timer();
            timer.schedule(new TimerTask() {
                @Override
                public void run() {
                    out.println("fetewtewwefwfewf egreg \n");
                    out.flush();
                    InputStream is;
                    try {
                        is = soc.getInputStream();
                        DataInputStream dis = new DataInputStream(is);
                        while (!soc.isClosed()) {
                            long value = dis.readLong();
                            System.out.println(value);
                        }
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }, 3000);
        }
    }

Answer 1

您正在使用timer.schedule(TimerTask task, long delay)，它仅安排任务执行一次。对于重复执行，请使用timer.scheduleAtFixedRate(TimerTask任务，长延迟，长周期)，即将代码更改为

 timer.scheduleAtFixedRate(new TimerTask() {
     ....
 }, 0, 3000);