如何正确关闭套接字然后重新打开？ [英] How to correctly close a socket and then reopen it?

问题描述

我正在为我所在的课程开发一款游戏，它完成了大约99％。但是，我意识到存在一个问题：如果服务器和客户端断开连接，并且客户端尝试重新连接（并且服务器已备份且运行正常），则客户端不会建立新连接。

I'm developing a game for a class that I am in, and it is about 99% done. However, I realized there is a problem: If the server and client disconnect, and the client attempts to reconnect (and the server is back up and running fine), the client is not making a new connection.

服务器和客户端都是多线程的。如果我向客户端发送 Kick 消息，那么客户端将关闭其套接字。如果我重新连接，我得到一个 SocketException ：套接字关闭，即使每次按下连接时，都会构造一个新的客户端，这基本上只是一个创建套接字并连接到的类带有get / send线程的服务器。

The server and client are both multi-threaded. If I send the client a Kick message, what happens is the client will close its socket. If I reconnect, I get a SocketException: socket closed even though whenever connect is pressed, a new Client is constructed, which is basically just a class that creates a socket and connects to the server with a get/send thread.

你觉得我有什么不合逻辑吗？它就像它试图使用构造的旧Socket和Client，但如果我做了一些 println 调用，我可以看到它确实构造了一个新的它们和它们在不同的记忆位置。

Do you think there is anything I am doing illogically? It is like it is attempting to use the old Socket and Client that were constructed, but if I do some println calls, I can see that it does construct a new one and they are in different memory locations.

谢谢！

推荐答案

关闭后套接字，您不能重复使用它来共享服务器和客户端类之间的其他数据。从 Java Socket API ，关于 close（）方法的描述：

After closing a socket, you cannot reuse it to share other data between Server and Client classes. From the Java Socket API, about close() method's description:

I / O操作中当前阻塞的任何线程在这个套接字上将
抛出一个SocketException。

Any thread currently blocked in an I/O operation upon this socket will throw a SocketException.

一旦套接字关闭，它就无法用于进一步的
网络使用（即无法重新连接或反弹）。需要创建一个新的套接字
。

Once a socket has been closed, it is not available for further networking use (i.e. can't be reconnected or rebound). A new socket needs to be created.

关闭此套接字也将关闭套接字的InputStream和
OutputStream。

Closing this socket will also close the socket's InputStream and OutputStream.

如果此套接字有关联的频道，则该频道也会关闭
。

If this socket has an associated channel then the channel is closed as well.

然后，无法关闭套接字并重新打开。我认为这就是抛出异常的原因。

Then, it isn't possible to close a socket and reopen it. That's the reason, I think, of the exception being thrown.

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