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POHow to tell if a socket has been disconnected (Java)
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copied!<p>I've read <a href="https://stackoverflow.com/questions/151590/java-how-to-detect-a-remote-side-socket-close">several</a> <a href="https://stackoverflow.com/questions/10240694/java-socket-api-how-to-tell-if-a-socket-has-been-closed">questions</a> about this on stack overflow already, but none of them has provided me with an elegant solution.</p> <p>I know that calling <code>isConnected()</code> and <code>isClosed()</code> on the <code>Socket</code> is useless because it returns the local connection state (if the server is connected - not if the client is connected, as I want).</p> <p>I also can't simply call <code>if(socket.getInputStream().read()==-1)</code>* because that would only account for the end of the stream (EOS) being reached - i.e., the client didn't send a message recently. This doesn't at all indicate that the client has disconnected however.</p> <p>I'm considering just having the client send a message to the server letting it know it's disconnecting just before it closes the socket, but I'm wondering if there's a simpler solution I'm missing - wanting to know the connection state of the remote socket is a fairly commonplace desire. Thanks.</p> <p>*not to mention the fact that <a href="http://docs.oracle.com/javase/7/docs/api/java/io/InputStream.html#read%28%29" rel="nofollow noreferrer">InputStream#read()</a> is an abstract method, I'm using <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInputStream.html" rel="nofollow noreferrer">DataInputStream</a> for data read methods (i.e. readInt(), readByte(), etc.)</p>

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