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Time Server

Posted Date: Total Responses: 0 Posted By: vignesh Member Level: Silver Points/Cash: 4

import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
import java.util.*;
import java.util.regex.*;

public class TimeServer {

// We can't use the normal daytime port (unless we're running as root,
// which is unlikely), so we use this one instead
private static int PORT = 8013;

// The port we'll actually use
private static int port = PORT;

// Charset and encoder for US-ASCII
private static Charset charset = Charset.forName("US-ASCII");
private static CharsetEncoder encoder = charset.newEncoder();

// Direct byte buffer for writing
private static ByteBuffer dbuf = ByteBuffer.allocateDirect(1024);

// Open and bind the server-socket channel
//
private static ServerSocketChannel setup() throws IOException {
ServerSocketChannel ssc = ServerSocketChannel.open();
InetSocketAddress isa
= new InetSocketAddress(InetAddress.getLocalHost(), port);
ssc.socket().bind(isa);
return ssc;
}

// Service the next request to come in on the given channel
//
private static void serve(ServerSocketChannel ssc) throws IOException {
SocketChannel sc = ssc.accept();
try {
String now = new Date().toString();
sc.write(encoder.encode(CharBuffer.wrap(now + "
")));
System.out.println(sc.socket().getInetAddress() + " : " + now);
sc.close();
} finally {
// Make sure we close the channel (and hence the socket)
sc.close();
}
}

public static void main(String[] args) throws IOException {
if (args.length > 1) {
System.err.println("Usage: java TimeServer [port]");
return;
}

// If the first argument is a string of digits then we take that
// to be the port number
if ((args.length == 1) && Pattern.matches("[0-9]+", args[0]))
port = Integer.parseInt(args[0]);

ServerSocketChannel ssc = setup();
for (;;)
serve(ssc);

}

}

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