servlet.html
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Java 2 Platform EE v1.3: Interface Servlet
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SUMMARY: INNER | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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javax.servlet</FONT>
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Interface Servlet</H2>
<DL>
<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../javax/servlet/jsp/HttpJspPage.html">HttpJspPage</A>, <A HREF="../../javax/servlet/jsp/JspPage.html">JspPage</A></DD>
</DL>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../javax/servlet/GenericServlet.html">GenericServlet</A></DD>
</DL>
<HR>
<DL>
<DT>public interface <B>Servlet</B></DL>
<P>
Defines methods that all servlets must implement.
<p>A servlet is a small Java program that runs within a Web server.
Servlets receive and respond to requests from Web clients,
usually across HTTP, the HyperText Transfer Protocol.
<p>To implement this interface, you can write a generic servlet
that extends
<code>javax.servlet.GenericServlet</code> or an HTTP servlet that
extends <code>javax.servlet.http.HttpServlet</code>.
<p>This interface defines methods to initialize a servlet,
to service requests, and to remove a servlet from the server.
These are known as life-cycle methods and are called in the
following sequence:
<ol>
<li>The servlet is constructed, then initialized with the <code>init</code> method.
<li>Any calls from clients to the <code>service</code> method are handled.
<li>The servlet is taken out of service, then destroyed with the
<code>destroy</code> method, then garbage collected and finalized.
</ol>
<p>In addition to the life-cycle methods, this interface
provides the <code>getServletConfig</code> method, which the servlet
can use to get any startup information, and the <code>getServletInfo</code>
method, which allows the servlet to return basic information about itself,
such as author, version, and copyright.
<P>
<DL>
<DT><B>See Also: </B><DD><A HREF="../../javax/servlet/GenericServlet.html"><CODE>GenericServlet</CODE></A>,
<A HREF="../../javax/servlet/http/HttpServlet.html"><CODE>HttpServlet</CODE></A></DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/Servlet.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>
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<CODE> <A HREF="../../javax/servlet/ServletConfig.html">ServletConfig</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/Servlet.html#getServletConfig()">getServletConfig</A></B>()</CODE>
<BR>
Returns a <A HREF="../../javax/servlet/ServletConfig.html"><CODE>ServletConfig</CODE></A> object, which contains
initialization and startup parameters for this servlet.</TD>
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<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/Servlet.html#getServletInfo()">getServletInfo</A></B>()</CODE>
<BR>
Returns information about the servlet, such
as author, version, and copyright.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/Servlet.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>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/Servlet.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>
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