如何在java中使接受的套接字无阻塞 [英] How to make an accepted socket non-blocking in java

问题描述

我正在接受来自客户端的连接，然后将该连接的套接字传递给另一个对象，但是，该套接字需要是非阻塞的。我正在尝试使用 getChannel（）。configureBlocking（false）但这似乎不起作用。它需要是非阻塞的，因为下面的方法每100ms调用一次。还有其他方法我应该做这个非阻塞？感谢您的帮助！

I'm accepting a connection from a client and then passing that connected socket off to another object, however, that socket needs to be non-blocking. I'm trying to use getChannel().configureBlocking(false) but that does not seem to be working. It needs to be non-blocking because this the method below is called every 100ms. Is there some other way that I should be making this non-blocking? Thanks for any help!

public void checkForClients() {
  DataOutputStream out;
  DataInputStream in;
  Socket connection;
  InetAddress tempIP;
  String IP;

  try {
     connection = serverSocket.accept();
     connection.getChannel().configureBlocking(false);

     System.err.println("after connection made");

     in = new DataInputStream(connection.getInputStream());
     out = new DataOutputStream(connection.getOutputStream());
     tempIP = connection.getInetAddress();
     IP = tempIP.toString();

     System.err.println("after ip string");

     // create a new user ex nihilo
     connectedUsers.add(new ConnectedUser(IP, null, connection, in, out));


     System.err.println("after add user");
  } catch (SocketTimeoutException e) {
     System.err.println("accept timeout - continuing execution");
  } catch (IOException e) {
     System.err.println("socket accept failed");
  }
}

推荐答案

两个事情：

1. 你为什么不使用 ServerSocket 如果你正在监听连接？


2. 如果你想接受多个客户，你想要使用一个循环。

多元化的基本结构客户端服务器是：

The basic structure of a multi-client server is:

while (true) {
  // accept connections
  // spawn thread to deal with that connection
}

如果问题在 accept（）调用，那就是 accept（）：它阻止等待连接。如果这是一个问题，我建议你有一个单独的线程来接受连接。

If the issue is blocking on the accept() call, well that's what accept() does: it blocks waiting for a connection. If that's an issue I suggest you have a separate thread to accept connections.

参见编写套接字的服务器端。

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