如何检测远程端套接字关闭?

问题描述

你如何检测 Socket#close() 是否在远程端的套接字上被调用?

How do you detect if Socket#close() has been called on a socket on the remote side?

推荐答案

isConnected 方法无济于事，即使远程端关闭，它也会返回 true插座.试试这个:

The isConnected method won't help, it will return true even if the remote side has closed the socket. Try this:

public class MyServer {
    public static final int PORT = 12345;
    public static void main(String[] args) throws IOException, InterruptedException {
        ServerSocket ss = ServerSocketFactory.getDefault().createServerSocket(PORT);
        Socket s = ss.accept();
        Thread.sleep(5000);
        ss.close();
        s.close();
    }
}

public class MyClient {
    public static void main(String[] args) throws IOException, InterruptedException {
        Socket s = SocketFactory.getDefault().createSocket("localhost", MyServer.PORT);
        System.out.println(" connected: " + s.isConnected());
        Thread.sleep(10000);
        System.out.println(" connected: " + s.isConnected());
    }
}

启动服务器，启动客户端.您会看到它打印了两次connected: true"，即使套接字第二次关闭.

Start the server, start the client. You'll see that it prints "connected: true" twice, even though the socket is closed the second time.

真正找出答案的唯一方法是在关联的 Input/OutputStreams 上读取(您将获得 -1 作为返回值)或写入(将抛出 IOException(管道损坏)).

The only way to really find out is by reading (you'll get -1 as return value) or writing (an IOException (broken pipe) will be thrown) on the associated Input/OutputStreams.

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