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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 Mon Sep 29 15:11:54 PDT 2003 --><TITLE>: Class GenericServlet</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 ID="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT ID="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="package-tree.html"><FONT ID="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT ID="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT ID="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT ID="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../javax/servlet/ServletContextAttributeEvent.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="GenericServlet.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.servlet</FONT><BR>Class GenericServlet</H2><PRE>java.lang.Object | +--<B>javax.servlet.GenericServlet</B></PRE><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../javax/servlet/http/HttpServlet.html">HttpServlet</A></DD></DL><HR><DL><DT>public abstract class <B>GenericServlet</B><DT>extends java.lang.Object<DT>implements <A HREF="../../javax/servlet/Servlet.html">Servlet</A>, <A HREF="../../javax/servlet/ServletConfig.html">ServletConfig</A>, java.io.Serializable</DL><P>Defines a generic, protocol-independent servlet. To write an HTTP servlet for use on the Web, extend <A HREF="../../javax/servlet/http/HttpServlet.html"><CODE>HttpServlet</CODE></A> instead. <p><code>GenericServlet</code> implements the <code>Servlet</code> and <code>ServletConfig</code> interfaces. <code>GenericServlet</code> may be directly extended by a servlet, although it's more common to extend a protocol-specific subclass such as <code>HttpServlet</code>. <p><code>GenericServlet</code> makes writing servlets easier. It provides simple versions of the lifecycle methods <code>init</code> and <code>destroy</code> and of the methods in the <code>ServletConfig</code> interface. <code>GenericServlet</code> also implements the <code>log</code> method, declared in the <code>ServletContext</code> interface. <p>To write a generic servlet, you need only override the abstract <code>service</code> method.<P><DL><DT><B>See Also: </B><DD><A HREF="../../serialized-form.html#javax.servlet.GenericServlet">Serialized Form</A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#GenericServlet()">GenericServlet</A></B>()</CODE><BR> Does nothing.</TD></TR></TABLE> <!-- ========== 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> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#destroy()">destroy</A></B>()</CODE><BR> Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#getInitParameter(java.lang.String)">getInitParameter</A></B>(java.lang.String name)</CODE><BR> Returns a <code>String</code> containing the value of the named initialization parameter, or <code>null</code> if the parameter does not exist.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.util.Enumeration</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#getInitParameterNames()">getInitParameterNames</A></B>()</CODE><BR> Returns the names of the servlet's initialization parameters as an <code>Enumeration</code> of <code>String</code> objects, or an empty <code>Enumeration</code> if the servlet has no initialization parameters.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javax/servlet/ServletConfig.html">ServletConfig</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#getServletConfig()">getServletConfig</A></B>()</CODE><BR> Returns this servlet's <A HREF="../../javax/servlet/ServletConfig.html"><CODE>ServletConfig</CODE></A> object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javax/servlet/ServletContext.html">ServletContext</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#getServletContext()">getServletContext</A></B>()</CODE><BR> Returns a reference to the <A HREF="../../javax/servlet/ServletContext.html"><CODE>ServletContext</CODE></A> in which this servlet is running.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#getServletInfo()">getServletInfo</A></B>()</CODE><BR> Returns information about the servlet, such as author, version, and copyright.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#getServletName()">getServletName</A></B>()</CODE><BR> Returns the name of this servlet instance.</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="../../javax/servlet/GenericServlet.html#init()">init</A></B>()</CODE><BR> A convenience method which can be overridden so that there's no need to call <code>super.init(config)</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="../../javax/servlet/GenericServlet.html#init(javax.servlet.ServletConfig)">init</A></B>(<A HREF="../../javax/servlet/ServletConfig.html">ServletConfig</A> config)</CODE><BR> Called by the servlet container to indicate to a servlet that the servlet is being placed into service.</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="../../javax/servlet/GenericServlet.html#log(java.lang.String)">log</A></B>(java.lang.String msg)</CODE><BR> Writes the specified message to a servlet log file, prepended by the servlet's name.</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="../../javax/servlet/GenericServlet.html#log(java.lang.String, java.lang.Throwable)">log</A></B>(java.lang.String message, java.lang.Throwable t)</CODE><BR> Writes an explanatory message and a stack trace for a given <code>Throwable</code> exception to the servlet log file, prepended by the servlet's name.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>abstract void</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)">service</A></B>(<A HREF="../../javax/servlet/ServletRequest.html">ServletRequest</A> req, <A HREF="../../javax/servlet/ServletResponse.html">ServletResponse</A> res)</CODE><BR> Called by the servlet container to allow the servlet to respond to a request.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TD></TR></TABLE><A NAME="GenericServlet()"><!-- --></A><H3>GenericServlet</H3><PRE>public <B>GenericServlet</B>()</PRE><DL><DD>Does nothing. All of the servlet initialization is done by one of the <code>init</code> methods.</DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">?? 快捷鍵說明
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