httpservlet.html
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Java 2 Platform EE v1.3: Class HttpServlet
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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.http</FONT>
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Class HttpServlet</H2>
<PRE>
java.lang.Object
|
+--<A HREF="../../../javax/servlet/GenericServlet.html">javax.servlet.GenericServlet</A>
|
+--<B>javax.servlet.http.HttpServlet</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>
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<DT>public abstract class <B>HttpServlet</B><DT>extends <A HREF="../../../javax/servlet/GenericServlet.html">GenericServlet</A><DT>implements java.io.Serializable</DL>
<P>
Provides an abstract class to be subclassed to create
an HTTP servlet suitable for a Web site. A subclass of
<code>HttpServlet</code> must override at least
one method, usually one of these:
<ul>
<li> <code>doGet</code>, if the servlet supports HTTP GET requests
<li> <code>doPost</code>, for HTTP POST requests
<li> <code>doPut</code>, for HTTP PUT requests
<li> <code>doDelete</code>, for HTTP DELETE requests
<li> <code>init</code> and <code>destroy</code>,
to manage resources that are held for the life of the servlet
<li> <code>getServletInfo</code>, which the servlet uses to
provide information about itself
</ul>
<p>There's almost no reason to override the <code>service</code>
method. <code>service</code> handles standard HTTP
requests by dispatching them to the handler methods
for each HTTP request type (the <code>do</code><i>XXX</i>
methods listed above).
<p>Likewise, there's almost no reason to override the
<code>doOptions</code> and <code>doTrace</code> methods.
<p>Servlets typically run on multithreaded servers,
so be aware that a servlet must handle concurrent
requests and be careful to synchronize access to shared resources.
Shared resources include in-memory data such as
instance or class variables and external objects
such as files, database connections, and network
connections.
See the
<a href="http://java.sun.com/Series/Tutorial/java/threads/multithreaded.html">
Java Tutorial on Multithreaded Programming</a> for more
information on handling multiple threads in a Java program.
<P>
<DL>
<DT><B>See Also: </B><DD><A HREF="../../../serialized-form.html#javax.servlet.http.HttpServlet">Serialized Form</A></DL>
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<B>Constructor Summary</B></FONT></TD>
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<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#HttpServlet()">HttpServlet</A></B>()</CODE>
<BR>
Does nothing, because this is an abstract class.</TD>
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<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#doDelete(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">doDelete</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req,
<A HREF="../../../javax/servlet/http/HttpServletResponse.html">HttpServletResponse</A> resp)</CODE>
<BR>
Called by the server (via the <code>service</code> method)
to allow a servlet to handle a DELETE request.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">doGet</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req,
<A HREF="../../../javax/servlet/http/HttpServletResponse.html">HttpServletResponse</A> resp)</CODE>
<BR>
Called by the server (via the <code>service</code> method) to
allow a servlet to handle a GET request.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#doHead(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">doHead</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req,
<A HREF="../../../javax/servlet/http/HttpServletResponse.html">HttpServletResponse</A> resp)</CODE>
<BR>
Receives an HTTP HEAD request from the protected
<code>service</code> method and handles the
request.</TD>
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<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#doOptions(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">doOptions</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req,
<A HREF="../../../javax/servlet/http/HttpServletResponse.html">HttpServletResponse</A> resp)</CODE>
<BR>
Called by the server (via the <code>service</code> method)
to allow a servlet to handle a OPTIONS request.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">doPost</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req,
<A HREF="../../../javax/servlet/http/HttpServletResponse.html">HttpServletResponse</A> resp)</CODE>
<BR>
Called by the server (via the <code>service</code> method)
to allow a servlet to handle a POST request.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#doPut(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">doPut</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req,
<A HREF="../../../javax/servlet/http/HttpServletResponse.html">HttpServletResponse</A> resp)</CODE>
<BR>
Called by the server (via the <code>service</code> method)
to allow a servlet to handle a PUT request.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#doTrace(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">doTrace</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req,
<A HREF="../../../javax/servlet/http/HttpServletResponse.html">HttpServletResponse</A> resp)</CODE>
<BR>
Called by the server (via the <code>service</code> method)
to allow a servlet to handle a TRACE request.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#getLastModified(javax.servlet.http.HttpServletRequest)">getLastModified</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req)</CODE>
<BR>
Returns the time the <code>HttpServletRequest</code>
object was last modified,
in milliseconds since midnight January 1, 1970 GMT.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/servlet/http/HttpServlet.html#service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">service</A></B>(<A HREF="../../../javax/servlet/http/HttpServletRequest.html">HttpServletRequest</A> req,
<A HREF="../../../javax/servlet/http/HttpServletResponse.html">HttpServletResponse</A> resp)</CODE>
<BR>
Receives standard HTTP requests from the public
<code>service</code> method and dispatches
them to the <code>do</code><i>XXX</i> methods defined in
this class.</TD>
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<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/http/HttpServlet.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>
Dispatches client requests to the protected
<code>service</code> method.</TD>
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