两分钟后sockets时间虽然超过两分钟

在这篇文章之后 ，我遇到了同样的问题，我设法通过一个简单的测试来重现它。 我希望你能帮助我。

让我解释一下，我正在使用套接字发送消息。 只要我将so_timeout设置为不到两分钟，一切都很好。 但如果我将它设置为超过两分钟，套接字会在两分钟后超时。 因此，如果我将so_timeout设置为10秒，则套接字将在10秒后超时，但如果我将其设置为180秒，套接字将在120秒后超时。

这是一个测试用例：

import java.io.*; import java.net.InetSocketAddress; import java.net.ServerSocket; import java.net.Socket; import java.net.SocketTimeoutException; /** * */ public class TestSocket1 { public static void main(String[] args) throws IOException { ServerSocket serverSocket = new ServerSocket(); serverSocket.setReuseAddress(true); serverSocket.bind(new InetSocketAddress(1111), 0); serverSocket.setSoTimeout(1000); Socket socket = null; boolean send = true; while (send) { try { socket = serverSocket.accept(); Thread.sleep(100); String messageReceived = readFromSocket(socket); System.out.println(messageReceived); if (send) { send = false; Thread.sleep(150000); // Causing 2.5 minutes delay // Sending message BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8")); PrintWriter printWriter = new PrintWriter(wr, true); String output = "Hello Back"; printWriter.println(output); printWriter.flush(); socket.shutdownOutput(); } } catch (SocketTimeoutException ie) { } catch (Exception e) { } finally { if (socket != null) { socket.close(); } } } } protected static String readFromSocket(Socket socket) throws IOException { StringBuilder messageReceived = new StringBuilder(); BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8")); String line = br.readLine(); messageReceived.append(line); socket.shutdownInput(); return messageReceived.toString(); } } 

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 import java.io.*; import java.net.InetSocketAddress; import java.net.Socket; import java.net.SocketAddress; /** * */ public class TestSocket2 { public static void main(String[] args) throws IOException { Socket socket = new Socket(); socket.setKeepAlive(true); socket.setReuseAddress(true); socket.setTcpNoDelay(true); socket.setSoTimeout(180000); // Should wait 3 minutes before throwing time out exception - Actually throwing after 2 minutes SocketAddress socketAddress = new InetSocketAddress(1111); socket.connect(socketAddress, 5000); // Sending message BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8")); PrintWriter printWriter = new PrintWriter(wr, true); String output = "Hello There"; printWriter.println(output); printWriter.flush(); socket.shutdownOutput(); String messageReceived = readFromSocket(socket); System.out.println(messageReceived); } protected static String readFromSocket(Socket socket) throws IOException { StringBuilder messageReceived = new StringBuilder(); BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8")); String line = br.readLine(); messageReceived.append(line); socket.shutdownInput(); return messageReceived.toString(); } } 

您应首先运行TestSocket1类，然后运行TestSocket2。

我很长时间都在努力解决这个问题，任何帮助都将受到赞赏。 谢谢。

• 编辑

所以我删除了对SO_TimeOut的依赖，并在这篇文章中采用@Nick建议来检查可用的输入流，然后再读取它。 但现在的问题是，在两分钟后，可用字节总是返回0，尽管输入被写入流。 所以我仍然有同样的问题。

Answer 1

您无法将连接超时增加到平台默认值之外，大约一分钟。 你只能减少它。 试图增加它实际上没有意义。 你想达到什么目的？

Answer 2

所以我想出了问题是什么

 socket.shutdownInput(); 

导致套接字更改为FIN_WAIT状态，因此在关闭前等待2分钟（ 2MSL ）