ServerSocketChannel.socket() 在 close() 之后仍然绑定

Question

我使用 java.nio 进行服务器编程并且工作正常。当我尝试关闭套接字时：

    serverChannel.socket().close();

        serverChannel.close();  

    boolean b1 = serverChannel.socket().isBound();   
  boolean b2 =
     serverChannel.socket().isClosed();

检查值，b1为真，b2为真。当我运行 netstat 我看到状态 od 端口是 "LISTENNING" 当我使用 "old" IO 时，关闭套接字确实如我所料（netstat 没有将端口列为监听）。

如何在不关闭 JVM 的情况下 "unbind" 套接字？

Answer 1

我找到了解决方案。我们必须记住，keys 也包含 serverSocketChannel。

if(this.serverChannel != null && this.serverChannel.isOpen()) {

    try {

        this.serverChannel.close();

    } catch (IOException e) {

        log.error("Exception while closing server socket");
    }
}

try {

    Iterator<SelectionKey> keys = this.selector.keys().iterator();

    while(keys.hasNext()) {

        SelectionKey key = keys.next();

        SelectableChannel channel = key.channel();

        if(channel instanceof SocketChannel) {

            SocketChannel socketChannel = (SocketChannel) channel;
            Socket socket = socketChannel.socket();
            String remoteHost = socket.getRemoteSocketAddress().toString();

            log.info("closing socket {}", remoteHost);

            try {

                socketChannel.close();

            } catch (IOException e) {

                log.warn("Exception while closing socket", e);
            }

            key.cancel();
        }
    }

    log.info("closing selector");
    selector.close();

} catch(Exception ex) {

    log.error("Exception while closing selector", ex);
}

Does Selector.close() closes all client sockets?

ServerSocketChannel.socket() 在 close() 之后仍然绑定

ServerSocketChannel.socket() is still bound after close()

java

socketchannel