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CharGenUDPClient (libcommons-net2-java API)
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org.apache.commons.net.chargen</FONT>
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Class CharGenUDPClient</H2>
<PRE>
<A HREF="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<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.chargen.CharGenUDPClient</B>
</PRE>
<HR>
<DL>
<DT><PRE>public final class <B>CharGenUDPClient</B><DT>extends <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html" title="class in org.apache.commons.net">DatagramSocketClient</A></DL>
</PRE>
<P>
The CharGenUDPClient class is a UDP implementation of a client for the
character generator protocol described in RFC 864. It can also be
used for Systat (RFC 866), Quote of the Day (RFC 865), and netstat
(port 15). All of these protocols involve sending a datagram to the
appropriate port, and reading data contained in one or more reply
datagrams. The chargen and quote of the day protocols only send
one reply datagram containing 512 bytes or less of data. The other
protocols may reply with more than one datagram, in which case you
must wait for a timeout to determine that all reply datagrams have
been sent.
<p>
To use the CharGenUDPClient class, just open a local UDP port
with <A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#open()"><CODE>open </CODE></A>
and call <A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#send(java.net.InetAddress, int)"><CODE>send </CODE></A> to send the datagram that will
initiate the data reply. For chargen or quote of the day, just
call <A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#receive()"><CODE>receive </CODE></A>, and you're done. For netstat and
systat, call receive in a while loop, and catch a SocketException and
InterruptedIOException to detect a timeout (don't forget to set the
timeout duration beforehand). Don't forget to call
<A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html#close()"><CODE>close() </CODE></A>
to clean up properly.
<p>
<p>
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Daniel F. Savarese</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/commons/net/chargen/CharGenTCPClient.html" title="class in org.apache.commons.net.chargen"><CODE>CharGenTCPClient</CODE></A></DL>
<HR>
<P>
<!-- =========== FIELD SUMMARY =========== -->
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#CHARGEN_PORT">CHARGEN_PORT</A></B></CODE>
<BR>
The character generator port value of 19 according to RFC 864.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#DEFAULT_PORT">DEFAULT_PORT</A></B></CODE>
<BR>
The default chargen port.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#NETSTAT_PORT">NETSTAT_PORT</A></B></CODE>
<BR>
The netstat port value of 19.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#QUOTE_OF_DAY_PORT">QUOTE_OF_DAY_PORT</A></B></CODE>
<BR>
The quote of the day port value of 17 according to RFC 865.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#SYSTAT_PORT">SYSTAT_PORT</A></B></CODE>
<BR>
The systat port value of 11 according to RFC 866.</TD>
</TR>
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<TH ALIGN="left"><B>Fields inherited from class org.apache.commons.net.<A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html" title="class in org.apache.commons.net">DatagramSocketClient</A></B></TH>
</TR>
<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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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#CharGenUDPClient()">CharGenUDPClient</A></B>()</CODE>
<BR>
The default CharGenUDPClient constructor.</TD>
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<CODE> byte[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#receive()">receive</A></B>()</CODE>
<BR>
Receive the reply data from the server.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#send(java.net.InetAddress)">send</A></B>(<A HREF="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</A> host)</CODE>
<BR>
Same as <code>send(host, CharGenUDPClient.DEFAULT_PORT);</code></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/net/chargen/CharGenUDPClient.html#send(java.net.InetAddress, int)">send</A></B>(<A HREF="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</A> host,
int port)</CODE>
<BR>
Sends the data initiation datagram.</TD>
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<TH ALIGN="left"><B>Methods inherited from class org.apache.commons.net.<A HREF="../../../../../org/apache/commons/net/DatagramSocketClient.html" title="class in org.apache.commons.net">DatagramSocketClient</A></B></TH>
</TR>
<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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<!-- ============ FIELD DETAIL =========== -->
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<A NAME="SYSTAT_PORT"><!-- --></A><H3>
SYSTAT_PORT</H3>
<PRE>
public static final int <B>SYSTAT_PORT</B></PRE>
<DL>
<DD>The systat port value of 11 according to RFC 866.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../constant-values.html#org.apache.commons.net.chargen.CharGenUDPClient.SYSTAT_PORT">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="NETSTAT_PORT"><!-- --></A><H3>
NETSTAT_PORT</H3>
<PRE>
public static final int <B>NETSTAT_PORT</B></PRE>
<DL>
<DD>The netstat port value of 19.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../constant-values.html#org.apache.commons.net.chargen.CharGenUDPClient.NETSTAT_PORT">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="QUOTE_OF_DAY_PORT"><!-- --></A><H3>
QUOTE_OF_DAY_PORT</H3>
<PRE>
public static final int <B>QUOTE_OF_DAY_PORT</B></PRE>
<DL>
<DD>The quote of the day port value of 17 according to RFC 865.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../constant-values.html#org.apache.commons.net.chargen.CharGenUDPClient.QUOTE_OF_DAY_PORT">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="CHARGEN_PORT"><!-- --></A><H3>
CHARGEN_PORT</H3>
<PRE>
public static final int <B>CHARGEN_PORT</B></PRE>
<DL>
<DD>The character generator port value of 19 according to RFC 864.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../constant-values.html#org.apache.commons.net.chargen.CharGenUDPClient.CHARGEN_PORT">Constant Field Values</A></DL>
</DL>
<HR>
<A NAME="DEFAULT_PORT"><!-- --></A><H3>
DEFAULT_PORT</H3>
<PRE>
public static final int <B>DEFAULT_PORT</B></PRE>
<DL>
<DD>The default chargen port. It is set to 19 according to RFC 864.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../constant-values.html#org.apache.commons.net.chargen.CharGenUDPClient.DEFAULT_PORT">Constant Field Values</A></DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="CharGenUDPClient()"><!-- --></A><H3>
CharGenUDPClient</H3>
<PRE>
public <B>CharGenUDPClient</B>()</PRE>
<DL>
<DD>The default CharGenUDPClient constructor. It initializes some internal
data structures for sending and receiving the necessary datagrams for
the chargen and related protocols.
<P>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="send(java.net.InetAddress, int)"><!-- --></A><H3>
send</H3>
<PRE>
public void <B>send</B>(<A HREF="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</A> host,
int port)
throws <A HREF="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Sends the data initiation datagram. This data in the packet is ignored
by the server, and merely serves to signal that the server should send
its reply.
<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>Throws:</B>
<DD><CODE><A HREF="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE> - If an error occurs while sending the datagram.</DL>
</DD>
</DL>
<HR>
<A NAME="send(java.net.InetAddress)"><!-- --></A><H3>
send</H3>
<PRE>
public void <B>send</B>(<A HREF="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</A> host)
throws <A HREF="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Same as <code>send(host, CharGenUDPClient.DEFAULT_PORT);</code>
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="receive()"><!-- --></A><H3>
receive</H3>
<PRE>
public byte[] <B>receive</B>()
throws <A HREF="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Receive the reply data from the server. This will always be 512 bytes
or less. Chargen and quote of the day only return one packet. Netstat
and systat require multiple calls to receive() with timeout detection.
<p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>The reply data from the server.
<DT><B>Throws:</B>
<DD><CODE><A HREF="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE> - If an error occurs while receiving the datagram.</DL>
</DD>
</DL>
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