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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:35:30 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Interface SocketOptions</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/SocketOptions.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/net/SocketImplFactory.html"><B>PREV CLASS</B></A> <A HREF="../../java/net/URLStreamHandlerFactory.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="SocketOptions.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#field_summary">FIELD</A> | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.net</FONT><BR>Interface SocketOptions</H2><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../java/net/DatagramSocketImpl.html">DatagramSocketImpl</A>, <A HREF="../../java/net/SocketImpl.html">SocketImpl</A></DD></DL><HR><DL><DT>public interface <B>SocketOptions</B></DL><P>Interface of methods to get/set socket options. This interface is implemented by: <B>SocketImpl</B> and <B>DatagramSocketImpl</B>. Subclasses of these should override the methods of this interface in order to support their own options. <P> The methods and constants which specify options in this interface are for implementation only. If you're not subclassing SocketImpl or DatagramSocketImpl, <B>you won't use these directly.</B> There are type-safe methods to get/set each of these options in Socket, ServerSocket, DatagramSocket and MulticastSocket. <P> A subset of the standard BSD-style socket options are supported in the base classes, <B>PlainSocketImpl</B> and <B>PlainDatagramSocketImpl</B>. A brief description of each and their use is provided. <P><P><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></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="../../java/net/SocketOptions.html#IP_MULTICAST_IF">IP_MULTICAST_IF</A></B></CODE><BR> Set which outgoing interface on which to send multicast packets.</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="../../java/net/SocketOptions.html#SO_BINDADDR">SO_BINDADDR</A></B></CODE><BR> Fetch the local address binding of a socket (this option cannot be "set" only "gotten", since sockets are bound at creation time, and so the locally bound address cannot be changed).</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="../../java/net/SocketOptions.html#SO_KEEPALIVE">SO_KEEPALIVE</A></B></CODE><BR> When the keepalive option is set for a TCP socket and no data has been exchanged across the socket in either direction for 2 hours (NOTE: the actual value is implementation dependent), TCP automatically sends a keepalive probe to the peer.</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="../../java/net/SocketOptions.html#SO_LINGER">SO_LINGER</A></B></CODE><BR> Specify a linger-on-close timeout.</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="../../java/net/SocketOptions.html#SO_RCVBUF">SO_RCVBUF</A></B></CODE><BR> Set a hint the size of the underlying buffers used by the platform for incoming network I/O.</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="../../java/net/SocketOptions.html#SO_REUSEADDR">SO_REUSEADDR</A></B></CODE><BR> Sets SO_REUSEADDR for a socket.</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="../../java/net/SocketOptions.html#SO_SNDBUF">SO_SNDBUF</A></B></CODE><BR> Set a hint the size of the underlying buffers used by the platform for outgoing network I/O.</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="../../java/net/SocketOptions.html#SO_TIMEOUT">SO_TIMEOUT</A></B></CODE><BR> Set a timeout on blocking Socket operations: </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="../../java/net/SocketOptions.html#TCP_NODELAY">TCP_NODELAY</A></B></CODE><BR> Disable Nagle's algorithm for this connection.</TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/Object.html">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/SocketOptions.html#getOption(int)">getOption</A></B>(int optID)</CODE><BR> Fetch the value of an option.</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="../../java/net/SocketOptions.html#setOption(int, java.lang.Object)">setOption</A></B>(int optID, <A HREF="../../java/lang/Object.html">Object</A> value)</CODE><BR> Enable/disable the option specified by <I>optID</I>.</TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><A NAME="field_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Field Detail</B></FONT></TD></TR></TABLE><A NAME="TCP_NODELAY"><!-- --></A><H3>TCP_NODELAY</H3><PRE>public static final int <B>TCP_NODELAY</B></PRE><DL><DD>Disable Nagle's algorithm for this connection. Written data to the network is not buffered pending acknowledgement of previously written data.<P> Valid for TCP only: SocketImpl. <P><DD><DL><DT><B>See Also: </B><DD><A HREF="../../java/net/Socket.html#setTcpNoDelay(boolean)"><CODE>Socket.setTcpNoDelay(boolean)</CODE></A>, <A HREF="../../java/net/Socket.html#getTcpNoDelay()"><CODE>Socket.getTcpNoDelay()</CODE></A></DL></DD></DL><HR><A NAME="SO_BINDADDR"><!-- --></A><H3>SO_BINDADDR</H3><PRE>public static final int <B>SO_BINDADDR</B></PRE><DL><DD>Fetch the local address binding of a socket (this option cannot be "set" only "gotten", since sockets are bound at creation time, and so the locally bound address cannot be changed). The default local address of a socket is INADDR_ANY, meaning any local address on a multi-homed host. A multi-homed host can use this option to accept connections to only one of its addresses (in the case of a ServerSocket or DatagramSocket), or to specify its return address to the peer (for a Socket or DatagramSocket). The parameter of this option is an InetAddress. <P> This option <B>must</B> be specified in the constructor. <P> Valid for: SocketImpl, DatagramSocketImpl <P><DD><DL><DT><B>See Also: </B><DD><A HREF="../../java/net/Socket.html#getLocalAddress()"><CODE>Socket.getLocalAddress()</CODE></A>, <A HREF="../../java/net/DatagramSocket.html#getLocalAddress()"><CODE>DatagramSocket.getLocalAddress()</CODE></A></DL></DD></DL><HR><A NAME="SO_REUSEADDR"><!-- --></A><H3>SO_REUSEADDR</H3><PRE>public static final int <B>SO_REUSEADDR</B></PRE><DL><DD>Sets SO_REUSEADDR for a socket. This is used only for MulticastSockets in java, and it is set by default for MulticastSockets. <P> Valid for: DatagramSocketImpl</DL><HR><A NAME="IP_MULTICAST_IF"><!-- --></A><H3>⌨️ 快捷键说明
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