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Java Programming Code Examples

Java > Date Time Code Examples


TimeServer 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); } }