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Java 2 Platform EE v1.3: Class GenericServlet
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SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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javax.servlet</FONT>
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Class GenericServlet</H2>
<PRE>
java.lang.Object
|
+--<B>javax.servlet.GenericServlet</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable, <A HREF="../../javax/servlet/Servlet.html">Servlet</A>, <A HREF="../../javax/servlet/ServletConfig.html">ServletConfig</A></DD>
</DL>
<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>
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<B>Constructor Summary</B></FONT></TD>
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<TD><CODE><B><A HREF="../../javax/servlet/GenericServlet.html#GenericServlet()">GenericServlet</A></B>()</CODE>
<BR>
Does nothing.</TD>
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<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>
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<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>
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<B>Constructor Detail</B></FONT></TD>
</TR>
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<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>
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