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copied!<p>You must not simply stop the server. The shutdown process might take a while while cleanup occurs because you need to ensure consistency. </p> <p>Imagine a database server, if you simply shut it down while it is carrying out transactions you may leave its data inconsistent. That's why it typically takes a while to shutdown the server.</p> <ul> <li>You must first stop accepting new connections in the server. </li> <li>Then you can either wait for the current worker threads to finish their work and then close the server and shutdown officially.</li> <li>Or you force the worker threads to close their connections with the<br> client (probably using some sort<br> of flag as suggested). This might imply some cleanup to leave data consistent, for instance revert trasnsactions or any kind of changes you have done in files or in memory.</li> </ul> <p>Closing the connections with the clients in the server side should cause the clients to get a EOF on their sides as far as I understand.</p> <p><strong>[EDIT-1]</strong></p> <p>I have delved a bit on the issue, just because I had not used sockets in a while and because I found the question interesting. I think as it has been well pointed out by others, the only option is to close the socket, which according got Javadocs will automatically close the input and output streams/</p> <p>If there are chances that the thread is not IO-blocked, but in wait state or sleeping, I think it is still recommended to issue a Thread.interrupt() for the corresponding worker thread of a given socket; because there cannot be certainty of the blocking of state of every thread.</p> <pre><code>public static class IOServerWorker implements Runnable{ private Socket socket; public IOServerWorker(Socket socket){ this.socket = socket; } @Override public void run() { String line = null; try{ BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); while( (line = reader.readLine())!=null){ System.out.println(line); } reader.close(); }catch(IOException e){ //TODO: do cleanup here //TODO: log | wrap | rethrow exception } } } </code></pre>

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