TCP 服务器响应超时

Question

我的任务是让一个简单的TCP客户端超时。客户端按预期工作，但是当客户端在 3 秒或更长时间内未收到输入时，我似乎无法让客户端超时。我对SO_TIMEOUT有基本的了解，但无法让它在这里工作。请帮忙

这是我的代码：TCPClient

private static final String host = "localhost";
    private static final int serverPort = 22003;
    public static void main(String[] args) throws Exception
    {
        try
        {
            System.out.println("You are connected to the TCPCLient;" + "n" + "Please enter a message:");
            BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
            @SuppressWarnings("resource")
            Socket client = new Socket(host, serverPort);
            client.setSoTimeout(3000);
            while(true)
            {
                DataOutputStream outToServer = new DataOutputStream(client.getOutputStream());
                BufferedReader inFromServer = new BufferedReader(new InputStreamReader(client.getInputStream()));
                String input = inFromUser.readLine();
                outToServer.writeBytes(input + "n");
                String modedInput = inFromServer.readLine();
                System.out.println("You Sent: " + modedInput);
                try
                {
                    Thread.sleep(2000);
                }
                catch(InterruptedException e)
                {
                    System.out.println("Slept-in");
                    e.getStackTrace();
                }
            }
        }
        catch(SocketTimeoutException e)
        {
            System.out.println("Timed Out Waiting for a Response from the Server");
        }
    }

Answer 1

setSoTimeout不会做你认为它做的事情。来自Javadoc：

将此选项设置为非零超时时，对 与此套接字关联的输入流将仅为此阻止 时间量。

这是从套接字读取的超时，因此即使没有数据reads()也会在 3 秒后返回。这不是套接字不活动的超时 - 即套接字在空闲 3 秒后不会断开连接。