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NTPUDPClient
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org.apache.commons.net.ntp</FONT>
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Class NTPUDPClient</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html" title="class in org.apache.commons.net">org.apache.commons.net.DatagramSocketClient</A>
      <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.commons.net.ntp.NTPUDPClient</B>
</PRE>
<HR>
<DL>
<DT><PRE>public final class <B>NTPUDPClient</B><DT>extends <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html" title="class in org.apache.commons.net">DatagramSocketClient</A></DL>
</PRE>

<P>
The NTPUDPClient class is a UDP implementation of a client for the
 Network Time Protocol (NTP) described in RFC 1305 as well as the
 Simple Network Time Protocol (SNTP) in RFC-2030. To use the class,
 merely open a local datagram socket with <a href="#open"> open </a>
 and call <a href="#getTime"> getTime </a> to retrieve the time. Then call
 <a href="org.apache.commons.net.DatagramSocketClient.html#close"> close </a>
 to close the connection properly.
 Successive calls to <a href="#getTime"> getTime </a> are permitted
 without re-establishing a connection.  That is because UDP is a
 connectionless protocol and the Network Time Protocol is stateless.
<P>

<P>
<DL>
<DT><B>Version:</B></DT>
  <DD>$Revision: 165675 $ $Date: 2005-05-02 15:09:55 -0500 (Mon, 02 May 2005) $</DD>
<DT><B>Author:</B></DT>
  <DD>Jason Mathews, MITRE Corp</DD>
</DL>
<HR>

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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/ntp/NTPUDPClient.html#DEFAULT_PORT">DEFAULT_PORT</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The default NTP port.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#_isOpen_">_isOpen_</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#_socket_">_socket_</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#_socketFactory_">_socketFactory_</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#_timeout_">_timeout_</A></CODE></TD>
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<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/ntp/NTPUDPClient.html#NTPUDPClient()">NTPUDPClient</A></B>()</CODE>

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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../org/apache/commons/net/ntp/TimeInfo.html" title="class in org.apache.commons.net.ntp">TimeInfo</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/ntp/NTPUDPClient.html#getTime(java.net.InetAddress)">getTime</A></B>(java.net.InetAddress&nbsp;host)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Retrieves the time information from the specified server on the
 default NTP port and returns it.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../org/apache/commons/net/ntp/TimeInfo.html" title="class in org.apache.commons.net.ntp">TimeInfo</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/ntp/NTPUDPClient.html#getTime(java.net.InetAddress, int)">getTime</A></B>(java.net.InetAddress&nbsp;host,
        int&nbsp;port)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Retrieves the time information from the specified server and port and
 returns it.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/ntp/NTPUDPClient.html#getVersion()">getVersion</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the NTP protocol version number that client sets on request packet
 that is sent to remote host (e.g.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/ntp/NTPUDPClient.html#setVersion(int)">setVersion</A></B>(int&nbsp;version)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the NTP protocol version number that client sets on request packet
 communicate with remote host.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#close()">close</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#getDefaultTimeout()">getDefaultTimeout</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#getLocalAddress()">getLocalAddress</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#getLocalPort()">getLocalPort</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#getSoTimeout()">getSoTimeout</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#isOpen()">isOpen</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#open()">open</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#open(int)">open</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#open(int, java.net.InetAddress)">open</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#setDatagramSocketFactory(org.apache.commons.net.DatagramSocketFactory)">setDatagramSocketFactory</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#setDefaultTimeout(int)">setDefaultTimeout</A>, <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#setSoTimeout(int)">setSoTimeout</A></CODE></TD>
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<A NAME="DEFAULT_PORT"><!-- --></A><H3>
DEFAULT_PORT</H3>
<PRE>
public static final int <B>DEFAULT_PORT</B></PRE>
<DL>
<DD>The default NTP port.  It is set to 123 according to RFC 1305.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../constant-values.html#org.apache.commons.net.ntp.NTPUDPClient.DEFAULT_PORT">Constant Field Values</A></DL>
</DL>

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<A NAME="NTPUDPClient()"><!-- --></A><H3>
NTPUDPClient</H3>
<PRE>
public <B>NTPUDPClient</B>()</PRE>
<DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<A NAME="getTime(java.net.InetAddress, int)"><!-- --></A><H3>
getTime</H3>
<PRE>
public <A HREF="../../../../../org/apache/commons/net/ntp/TimeInfo.html" title="class in org.apache.commons.net.ntp">TimeInfo</A> <B>getTime</B>(java.net.InetAddress&nbsp;host,
                        int&nbsp;port)
                 throws java.io.IOException</PRE>
<DL>
<DD>Retrieves the time information from the specified server and port and
 returns it. The time is the number of miliiseconds since
 00:00 (midnight) 1 January 1900 UTC, as specified by RFC 1305.
 This method reads the raw NTP packet and constructs a <i>TimeInfo</i>
 object that allows access to all the fields of the NTP message header.
 <p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>host</CODE> - The address of the server.<DD><CODE>port</CODE> - The port of the service.
<DT><B>Returns:</B><DD>The time value retrieved from the server.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - If an error occurs while retrieving the time.</DL>
</DD>
</DL>
<HR>

<A NAME="getTime(java.net.InetAddress)"><!-- --></A><H3>
getTime</H3>
<PRE>
public <A HREF="../../../../../org/apache/commons/net/ntp/TimeInfo.html" title="class in org.apache.commons.net.ntp">TimeInfo</A> <B>getTime</B>(java.net.InetAddress&nbsp;host)
                 throws java.io.IOException</PRE>
<DL>
<DD>Retrieves the time information from the specified server on the
 default NTP port and returns it. The time is the number of miliiseconds
 since 00:00 (midnight) 1 January 1900 UTC, as specified by RFC 1305.
 This method reads the raw NTP packet and constructs a <i>TimeInfo</i>
 object that allows access to all the fields of the NTP message header.
 <p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>host</CODE> - The address of the server.
<DT><B>Returns:</B><DD>The time value retrieved from the server.
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - If an error occurs while retrieving the time.</DL>
</DD>
</DL>
<HR>

<A NAME="getVersion()"><!-- --></A><H3>
getVersion</H3>
<PRE>
public int <B>getVersion</B>()</PRE>
<DL>
<DD>Returns the NTP protocol version number that client sets on request packet
 that is sent to remote host (e.g. 3=NTP v3, 4=NTP v4, etc.)
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the NTP protocol version number that client sets on request packet.<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/commons/net/ntp/NTPUDPClient.html#setVersion(int)"><CODE>setVersion(int)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setVersion(int)"><!-- --></A><H3>
setVersion</H3>
<PRE>
public void <B>setVersion</B>(int&nbsp;version)</PRE>
<DL>
<DD>Sets the NTP protocol version number that client sets on request packet
 communicate with remote host.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>version</CODE> - the NTP protocol version number</DL>
</DD>
</DL>
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