// RFC867 specifies port 13 for this service. On Unix platforms,
// you need to be running as root to use that port, so we allow
// this service to use other ports for testing.
int port = 13;
if (args.length > 0) port = Integer.parseInt(args[0]);
// Create a channel to listen for connections on.
ServerSocketChannel server = ServerSocketChannel.open();
// Bind the channel to a local port. Note that we do this by obtaining
// the underlying java.net.ServerSocket and binding that socket.
server.socket().bind(new InetSocketAddress(port));
// Get an encoder for converting strings to bytes
CharsetEncoder encoder = Charset.forName("US-ASCII").newEncoder();
for(;;) { // Loop forever, processing client connections
// Wait for a client to connect
SocketChannel client = server.accept();
// Build response string, wrap, and encode to bytes
String date = new java.util.Date().toString() + "\r\n";
ByteBuffer response = encoder.encode(CharBuffer.wrap(date));
// Send the response to the client and disconnect.
client.write(response);
client.close();
}
