Question

我有通过Java在Socket类上发送数据的功能。当我发送数据时，我需要接收一些数据。问题是如何在2秒内设置等待数据的超时（如果我在2秒内没有收到数据，我需要理解通信错误和显示消息）。有我的代码，有什么帮助吗？

    public boolean SendMonitorMessage(
            final MonitorRequestRepeatMessageTCP message) {
        boolean result = true;
        System.out
                .println("****************** SEND MONITOR REQUEST REPEAT MESSAGE TCP **********************************");

        // new Thread() {
        // public void run() {
        int prevService=message.GetService();
        synchronized (socket) {
            try {
                System.out.println("IPADDRESS=" + ipAddress);
                System.out.println("PORT=" + port);
                System.out.println("Is reachable=" + Ping());
                message.PrintMessage(message.toBytes());

                OutputStream socketOutputStream = (OutputStream) socket
                        .getOutputStream();
                socketOutputStream.write(message.toBytes());

                InputStream socketInputStream = (InputStream) socket
                        .getInputStream();

                byte[] buffer = new byte[256];
                List<byte[]> received = new LinkedList<byte[]>();
                int numberReceived;
                byte[] tempBuffer;

                while ((numberReceived = socketInputStream.read(buffer)) != -1) {
                    tempBuffer = new byte[numberReceived];
                    ByteBuffer baferce = ByteBuffer.wrap(tempBuffer);
                    baferce.put(buffer, 0, numberReceived);
                    received.add(tempBuffer);
                }

                if (received.size()>0){
                    new MonitorResponseMessageTCP(received, message.GetMonitorVariablesArrayList(), prevService);
                }
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return true;
    }

Answer 1

请参阅Socket和ServerSocket。这两个类都有setSoTimeout方法来指定等待连接或等待接收数据时等待的最长时间。当该时间结束时，套接字会抛出一个SocketTimeoutException，您可以使用错误消息处理该问题，或者您想要处理。

在执行您想要暂停的操作之前，您必须先致电setSoTimeout。

之前

while ((numberReceived = socketInputStream.read(buffer)) != -1) {

您需要致电

socket.setSoTimeout(2000);

然后将catch(SocketTimeoutException)部分添加到您已有的try / catch块中。

在接收dataover Socket时设置超时

1 个答案: