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POJava Daytime Client
 

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  1. POJava Daytime Client
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    <p>I need to get current time from a date time server by using following code. </p> <pre><code>import java.io.*; import java.net.*; class DaytimeClient { public static void main (String[] args) throws IOException { if ((args.length != 1)) ("Syntax: DaytimeClient &lt;host&gt;[:&lt;port&gt;]"); int idx = args[0].indexOf (":"); int port = (idx &gt; -1) ? Integer.parseInt (args[0].substring (idx + 1)) : 13; String hostName = (idx &gt; -1) ? args[0].substring (0, idx) : args[0]; InetAddress host = InetAddress.getByName (hostName); DatagramSocket socket = new DatagramSocket (); socket.setSoTimeout (5000); DatagramPacket packet = new DatagramPacket (new byte[256], 1, host, port); socket.send (packet); packet.setLength (packet.getData ().length); socket.receive (packet); socket.close (); byte[] data = packet.getData (); int length = packet.getLength (); System.out.println (new String (data, 0, length, "latin1")); } } </code></pre> <p>after compile i run this code with "java DaytimeClient 165.193.126.229".But it doesn't worked. Got the error </p> <blockquote> <p>C:\daytimeclient>java DaytimeClient 96.47.67.105 Exception in thread "main" java.net.SocketTimeoutException: Receive timed out at java.net.DualStackPlainDatagramSocketImpl.socketReceiveOrPeekData(Native Method) at java.net.DualStackPlainDatagramSocketImpl.receive0(Unknown Source) at java.net.AbstractPlainDatagramSocketImpl.receive(Unknown Source) at java.net.DatagramSocket.receive(Unknown Source) at DaytimeClient.main(DaytimeClient.java:32)</p> </blockquote> <p>Then i wrote a server as follow, </p> <pre><code>import java.io.*; import java.net.*; public class DaytimeServer { public static final int DEFAULT_PORT = 13; public static void main (String[] args) throws IOException { if (args.length &gt; 1) throw new IllegalArgumentException ("Syntax: DaytimeServer [&lt;port&gt;]"); DatagramSocket socket = new DatagramSocket (args.length == 0 ? DEFAULT_PORT : Integer.parseInt (args[0])); DatagramPacket packet = new DatagramPacket (new byte[1], 1); while (true) { socket.receive (packet); System.out.println ("Received from: " + packet.getAddress () + ":" + packet.getPort ()); byte[] outBuffer = new java.util.Date ().toString () .getBytes ("latin1"); packet.setData (outBuffer); packet.setLength (outBuffer.length); socket.send (packet); } } } </code></pre> <p>And run the first code with "java DaytimeClient localhost". Then it's work.</p> <p>I need to do my work with a remort day time server so why "java DaytimeClient 165.193.126.229" doesn't worked. </p> <p>(Reference codes got from <a href="http://www.stepwise.hk/npwiki/Tutorial/JavaUDPDaytime" rel="nofollow">http://www.stepwise.hk/npwiki/Tutorial/JavaUDPDaytime</a>)</p>
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    1. USLakmal Vithanage
    1. USLakmal Vithanage
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      1. POJava Daytime Client
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    1. COIs the remote system even running a daytime service?
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      1. POJava Daytime Client
      1. USPetesh
    2. COI got the server informations from here, http://tf.nist.gov/tf-cgi/servers.cgi
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      1. POJava Daytime Client
      1. USLakmal Vithanage
    3. COHave you tried connecting to it by other means? Are you sure there's no firewall in the way blocking it?
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      1. POJava Daytime Client
      1. USdcsohl
 

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