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ServletContext (Tomcat API Documentation)
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SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD>
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<FONT SIZE="-1">
javax.servlet</FONT>
<BR>
Interface ServletContext</H2>
<HR>
<DL>
<DT><PRE>public interface <B>ServletContext</B></DL>
</PRE>
<P>
Defines a set of methods that a servlet uses to communicate with its
servlet container, for example, to get the MIME type of a file, dispatch
requests, or write to a log file.
<p>There is one context per "web application" per Java Virtual Machine. (A
"web application" is a collection of servlets and content installed under a
specific subset of the server's URL namespace such as <code>/catalog</code>
and possibly installed via a <code>.war</code> file.)
<p>In the case of a web
application marked "distributed" in its deployment descriptor, there will
be one context instance for each virtual machine. In this situation, the
context cannot be used as a location to share global information (because
the information won't be truly global). Use an external resource like
a database instead.
<p>The <code>ServletContext</code> object is contained within
the <A HREF="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet"><CODE>ServletConfig</CODE></A> object, which the Web server provides the
servlet when the servlet is initialized.
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Version$</DD>
<DT><B>Author:</B></DT>
<DD>Various</DD>
<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/Servlet.html#getServletConfig()"><CODE>Servlet.getServletConfig()</CODE></A>,
<A HREF="../../javax/servlet/ServletConfig.html#getServletContext()"><CODE>ServletConfig.getServletContext()</CODE></A></DL>
<HR>
<P>
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<B>Method Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getAttribute(java.lang.String)">getAttribute</A></B>(java.lang.String name)</CODE>
<BR>
Returns the servlet container attribute with the given name,
or <code>null</code> if there is no attribute by that name.</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/ServletContext.html#getAttributeNames()">getAttributeNames</A></B>()</CODE>
<BR>
Returns an <code>Enumeration</code> containing the
attribute names available
within this servlet context.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../javax/servlet/ServletContext.html" title="interface in javax.servlet">ServletContext</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getContext(java.lang.String)">getContext</A></B>(java.lang.String uripath)</CODE>
<BR>
Returns a <code>ServletContext</code> object that
corresponds to a specified URL on the server.</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/ServletContext.html#getContextPath()">getContextPath</A></B>()</CODE>
<BR>
</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/ServletContext.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
context-wide 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/ServletContext.html#getInitParameterNames()">getInitParameterNames</A></B>()</CODE>
<BR>
Returns the names of the context's initialization parameters as an
<code>Enumeration</code> of <code>String</code> objects, or an
empty <code>Enumeration</code> if the context has no initialization
parameters.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getMajorVersion()">getMajorVersion</A></B>()</CODE>
<BR>
Returns the major version of the Java Servlet API that this
servlet container supports.</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/ServletContext.html#getMimeType(java.lang.String)">getMimeType</A></B>(java.lang.String file)</CODE>
<BR>
Returns the MIME type of the specified file, or <code>null</code> if
the MIME type is not known.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getMinorVersion()">getMinorVersion</A></B>()</CODE>
<BR>
Returns the minor version of the Servlet API that this
servlet container supports.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet">RequestDispatcher</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getNamedDispatcher(java.lang.String)">getNamedDispatcher</A></B>(java.lang.String name)</CODE>
<BR>
Returns a <A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><CODE>RequestDispatcher</CODE></A> object that acts
as a wrapper for the named servlet.</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/ServletContext.html#getRealPath(java.lang.String)">getRealPath</A></B>(java.lang.String path)</CODE>
<BR>
Returns a <code>String</code> containing the real path
for a given virtual path.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet">RequestDispatcher</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getRequestDispatcher(java.lang.String)">getRequestDispatcher</A></B>(java.lang.String path)</CODE>
<BR>
Returns a <A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><CODE>RequestDispatcher</CODE></A> object that acts
as a wrapper for the resource located at the given path.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.net.URL</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getResource(java.lang.String)">getResource</A></B>(java.lang.String path)</CODE>
<BR>
Returns a URL to the resource that is mapped to a specified
path.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.io.InputStream</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getResourceAsStream(java.lang.String)">getResourceAsStream</A></B>(java.lang.String path)</CODE>
<BR>
Returns the resource located at the named path as
an <code>InputStream</code> object.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Set</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getResourcePaths(java.lang.String)">getResourcePaths</A></B>(java.lang.String path)</CODE>
<BR>
Returns a directory-like listing of all the paths to resources within the web application whose longest sub-path
matches the supplied path argument.</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/ServletContext.html#getServerInfo()">getServerInfo</A></B>()</CODE>
<BR>
Returns the name and version of the servlet container on which
the servlet is running.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../javax/servlet/Servlet.html" title="interface in javax.servlet">Servlet</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/servlet/ServletContext.html#getServlet(java.lang.String)">getServlet</A></B>(java.lang.String name)</CODE>
<BR>
<B>Deprecated.</B> <I>As of Java Servlet API 2.1, with no direct replacement.
<p>This method was originally defined to retrieve a servlet
from a <code>ServletContext</code>. In this version, this method
always returns <code>null</code> and remains only to preserve
binary compatibility. This method will be permanently removed
in a future version of the Java Servlet API.
<p>In lieu of this method, servlets can share information using the
<code>ServletContext</code> class and can perform shared business logic
by invoking methods on common non-servlet classes.</I></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/ServletContext.html#getServletContextName()">getServletContextName</A></B>()</CODE>
<BR>
Returns the name of this web application corresponding to this ServletContext as specified in the deployment
descriptor for this web application by the display-name element.</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/ServletContext.html#getServletNames()">getServletNames</A></B>()</CODE>
<BR>
<B>Deprecated.</B> <I>As of Java Servlet API 2.1, with no replacement.
<p>This method was originally defined to return an
<code>Enumeration</code>
of all the servlet names known to this context. In this version,
this method always returns an empty <code>Enumeration</code> and
remains only to preserve binary compatibility. This method will
be permanently removed in a future version of the Java Servlet API.</I></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/ServletContext.html#getServlets()">getServlets</A></B>()</CODE>
<BR>
<B>Deprecated.</B> <I>As of Java Servlet API 2.0, with no replacement.
<p>This method was originally defined to return an <code>Enumeration</code>
of all the servlets known to this servlet context. In this
version, this method always returns an empty enumeration and
remains only to preserve binary compatibility. This method
will be permanently removed in a future version of the Java
Servlet API.</I></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/ServletContext.html#log(java.lang.Exception, java.lang.String)">log</A></B>(java.lang.Exception exception,
java.lang.String msg)</CODE>
<BR>
<B>Deprecated.</B> <I>As of Java Servlet API 2.1, use
<A HREF="../../javax/servlet/ServletContext.html#log(java.lang.String, java.lang.Throwable)"><CODE>log(String message, Throwable throwable)</CODE></A>
instead.
<p>This method was originally defined to write an
exception's stack trace and an explanatory error message
to the servlet log file.</I></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/ServletContext.html#log(java.lang.String)">log</A></B>(java.lang.String msg)</CODE>
<BR>
Writes the specified message to a servlet log file, usually
an event log.</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/ServletContext.html#log(java.lang.String, java.lang.Throwable)">log</A></B>(java.lang.String message,
java.lang.Throwable throwable)</CODE>
<BR>
Writes an explanatory message and a stack trace
for a given <code>Throwable</code> exception
to the servlet log file.</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/ServletContext.html#removeAttribute(java.lang.String)">removeAttribute</A></B>(java.lang.String name)</CODE>
<BR>
Removes the attribute with the given name from
the servlet context.</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/ServletContext.html#setAttribute(java.lang.String, java.lang.Object)">setAttribute</A></B>(java.lang.String name,
java.lang.Object object)</CODE>
<BR>
Binds an object to a given attribute name in this servlet context.</TD>
</TR>
</TABLE>
<P>
<!-- ============ METHOD DETAIL ========== -->
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<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="getContext(java.lang.String)"><!-- --></A><H3>
getContext</H3>
<PRE>
<A HREF="../../javax/servlet/ServletContext.html" title="interface in javax.servlet">ServletContext</A> <B>getContext</B>(java.lang.String uripath)</PRE>
<DL>
<DD>Returns a <code>ServletContext</code> object that
corresponds to a specified URL on the server.
<p>This method allows servlets to gain
access to the context for various parts of the server, and as
needed obtain <A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><CODE>RequestDispatcher</CODE></A> objects from the context.
The given path must be begin with "/", is interpreted relative
to the server's document root and is matched against the context roots of
other web applications hosted on this container.
<p>In a security conscious environment, the servlet container may
return <code>null</code> for a given URL.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>uripath</CODE> - a <code>String</code> specifying the context path of
another web application in the container.
<DT><B>Returns:</B><DD>the <code>ServletContext</code> object that
corresponds to the named URL, or null if either
none exists or the container wishes to restrict
this access.<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><CODE>RequestDispatcher</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getContextPath()"><!-- --></A><H3>
getContextPath</H3>
<PRE>
java.lang.String <B>getContextPath</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getMajorVersion()"><!-- --></A><H3>
getMajorVersion</H3>
<PRE>
int <B>getMajorVersion</B>()</PRE>
<DL>
<DD>Returns the major version of the Java Servlet API that this
servlet container supports. All implementations that comply
with Version 2.4 must have this method
return the integer 2.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>2</DL>
</DD>
</DL>
<HR>
<A NAME="getMinorVersion()"><!-- --></A><H3>
getMinorVersion</H3>
<PRE>
int <B>getMinorVersion</B>()</PRE>
<DL>
<DD>Returns the minor version of the Servlet API that this
servlet container supports. All implementations that comply
with Version 2.5 must have this method
return the integer 5.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>5</DL>
</DD>
</DL>
<HR>
<A NAME="getMimeType(java.lang.String)"><!-- --></A><H3>
getMimeType</H3>
<PRE>
java.lang.String <B>getMimeType</B>(java.lang.String file)</PRE>
<DL>
<DD>Returns the MIME type of the specified file, or <code>null</code> if
the MIME type is not known. The MIME type is determined
by the configuration of the servlet container, and may be specified
in a web application deployment descriptor. Common MIME
types are <code>"text/html"</code> and <code>"image/gif"</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>file</CODE> - a <code>String</code> specifying the name
of a file
<DT><B>Returns:</B><DD>a <code>String</code> specifying the file's MIME type</DL>
</DD>
</DL>
<HR>
<A NAME="getResourcePaths(java.lang.String)"><!-- --></A><H3>
getResourcePaths</H3>
<PRE>
java.util.Set <B>getResourcePaths</B>(java.lang.String path)</PRE>
<DL>
<DD>Returns a directory-like listing of all the paths to resources within the web application whose longest sub-path
matches the supplied path argument. Paths indicating subdirectory paths end with a '/'. The returned paths are all
relative to the root of the web application and have a leading '/'. For example, for a web application
containing<br><br>
/welcome.html<br>
/catalog/index.html<br>
/catalog/products.html<br>
/catalog/offers/books.html<br>
/catalog/offers/music.html<br>
/customer/login.jsp<br>
/WEB-INF/web.xml<br>
/WEB-INF/classes/com.acme.OrderServlet.class,<br><br>
getResourcePaths("/") returns {"/welcome.html", "/catalog/", "/customer/", "/WEB-INF/"}<br>
getResourcePaths("/catalog/") returns {"/catalog/index.html", "/catalog/products.html", "/catalog/offers/"}.<br>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>path</CODE> - the partial path used to match the resources,
which must start with a /
<DT><B>Returns:</B><DD>a Set containing the directory listing, or null if there are no resources in the web application whose path
begins with the supplied path.<DT><B>Since:</B></DT>
<DD>Servlet 2.3</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getResource(java.lang.String)"><!-- --></A><H3>
getResource</H3>
<PRE>
java.net.URL <B>getResource</B>(java.lang.String path)
throws java.net.MalformedURLException</PRE>
<DL>
<DD>Returns a URL to the resource that is mapped to a specified
path. The path must begin with a "/" and is interpreted
as relative to the current context root.
<p>This method allows the servlet container to make a resource
available to servlets from any source. Resources
can be located on a local or remote
file system, in a database, or in a <code>.war</code> file.
<p>The servlet container must implement the URL handlers
and <code>URLConnection</code> objects that are necessary
to access the resource.
<p>This method returns <code>null</code>
if no resource is mapped to the pathname.
<p>Some containers may allow writing to the URL returned by
this method using the methods of the URL class.
<p>The resource content is returned directly, so be aware that
requesting a <code>.jsp</code> page returns the JSP source code.
Use a <code>RequestDispatcher</code> instead to include results of
an execution.
<p>This method has a different purpose than
<code>java.lang.Class.getResource</code>,
which looks up resources based on a class loader. This
method does not use class loaders.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>path</CODE> - a <code>String</code> specifying
the path to the resource
<DT><B>Returns:</B><DD>the resource located at the named path,
or <code>null</code> if there is no resource
at that path
<DT><B>Throws:</B>
<DD><CODE>java.net.MalformedURLException</CODE> - if the pathname is not given in
the correct form</DL>
</DD>
</DL>
<HR>
<A NAME="getResourceAsStream(java.lang.String)"><!-- --></A><H3>
getResourceAsStream</H3>
<PRE>
java.io.InputStream <B>getResourceAsStream</B>(java.lang.String path)</PRE>
<DL>
<DD>Returns the resource located at the named path as
an <code>InputStream</code> object.
<p>The data in the <code>InputStream</code> can be
of any type or length. The path must be specified according
to the rules given in <code>getResource</code>.
This method returns <code>null</code> if no resource exists at
the specified path.
<p>Meta-information such as content length and content type
that is available via <code>getResource</code>
method is lost when using this method.
<p>The servlet container must implement the URL handlers
and <code>URLConnection</code> objects necessary to access
the resource.
<p>This method is different from
<code>java.lang.Class.getResourceAsStream</code>,
which uses a class loader. This method allows servlet containers
to make a resource available
to a servlet from any location, without using a class loader.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>path</CODE> - a <code>String</code> specifying the path
to the resource
<DT><B>Returns:</B><DD>the <code>InputStream</code> returned to the
servlet, or <code>null</code> if no resource
exists at the specified path</DL>
</DD>
</DL>
<HR>
<A NAME="getRequestDispatcher(java.lang.String)"><!-- --></A><H3>
getRequestDispatcher</H3>
<PRE>
<A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet">RequestDispatcher</A> <B>getRequestDispatcher</B>(java.lang.String path)</PRE>
<DL>
<DD>Returns a <A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><CODE>RequestDispatcher</CODE></A> object that acts
as a wrapper for the resource located at the given path.
A <code>RequestDispatcher</code> object can be used to forward
a request to the resource or to include the resource in a response.
The resource can be dynamic or static.
<p>The pathname must begin with a "/" and is interpreted as relative
to the current context root. Use <code>getContext</code> to obtain
a <code>RequestDispatcher</code> for resources in foreign contexts.
This method returns <code>null</code> if the <code>ServletContext</code>
cannot return a <code>RequestDispatcher</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>path</CODE> - a <code>String</code> specifying the pathname
to the resource
<DT><B>Returns:</B><DD>a <code>RequestDispatcher</code> object
that acts as a wrapper for the resource
at the specified path, or <code>null</code> if
the <code>ServletContext</code> cannot return
a <code>RequestDispatcher</code><DT><B>See Also:</B><DD><A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><CODE>RequestDispatcher</CODE></A>,
<A HREF="../../javax/servlet/ServletContext.html#getContext(java.lang.String)"><CODE>getContext(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getNamedDispatcher(java.lang.String)"><!-- --></A><H3>
getNamedDispatcher</H3>
<PRE>
<A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet">RequestDispatcher</A> <B>getNamedDispatcher</B>(java.lang.String name)</PRE>
<DL>
<DD>Returns a <A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><CODE>RequestDispatcher</CODE></A> object that acts
as a wrapper for the named servlet.
<p>Servlets (and JSP pages also) may be given names via server
administration or via a web application deployment descriptor.
A servlet instance can determine its name using
<A HREF="../../javax/servlet/ServletConfig.html#getServletName()"><CODE>ServletConfig.getServletName()</CODE></A>.
<p>This method returns <code>null</code> if the
<code>ServletContext</code>
cannot return a <code>RequestDispatcher</code> for any reason.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - a <code>String</code> specifying the name
of a servlet to wrap
<DT><B>Returns:</B><DD>a <code>RequestDispatcher</code> object
that acts as a wrapper for the named servlet,
or <code>null</code> if the <code>ServletContext</code>
cannot return a <code>RequestDispatcher</code><DT><B>See Also:</B><DD><A HREF="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><CODE>RequestDispatcher</CODE></A>,
<A HREF="../../javax/servlet/ServletContext.html#getContext(java.lang.String)"><CODE>getContext(java.lang.String)</CODE></A>,
<A HREF="../../javax/servlet/ServletConfig.html#getServletName()"><CODE>ServletConfig.getServletName()</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getServlet(java.lang.String)"><!-- --></A><H3>
getServlet</H3>
<PRE>
<A HREF="../../javax/servlet/Servlet.html" title="interface in javax.servlet">Servlet</A> <B>getServlet</B>(java.lang.String name)
throws <A HREF="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</A></PRE>
<DL>
<DD><B>Deprecated.</B> <I>As of Java Servlet API 2.1, with no direct replacement.
<p>This method was originally defined to retrieve a servlet
from a <code>ServletContext</code>. In this version, this method
always returns <code>null</code> and remains only to preserve
binary compatibility. This method will be permanently removed
in a future version of the Java Servlet API.
<p>In lieu of this method, servlets can share information using the
<code>ServletContext</code> class and can perform shared business logic
by invoking methods on common non-servlet classes.</I>
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="getServlets()"><!-- --></A><H3>
getServlets</H3>
<PRE>
java.util.Enumeration <B>getServlets</B>()</PRE>
<DL>
<DD><B>Deprecated.</B> <I>As of Java Servlet API 2.0, with no replacement.
<p>This method was originally defined to return an <code>Enumeration</code>
of all the servlets known to this servlet context. In this
version, this method always returns an empty enumeration and
remains only to preserve binary compatibility. This method
will be permanently removed in a future version of the Java
Servlet API.</I>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getServletNames()"><!-- --></A><H3>
getServletNames</H3>
<PRE>
java.util.Enumeration <B>getServletNames</B>()</PRE>
<DL>
<DD><B>Deprecated.</B> <I>As of Java Servlet API 2.1, with no replacement.
<p>This method was originally defined to return an
<code>Enumeration</code>
of all the servlet names known to this context. In this version,
this method always returns an empty <code>Enumeration</code> and
remains only to preserve binary compatibility. This method will
be permanently removed in a future version of the Java Servlet API.</I>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="log(java.lang.String)"><!-- --></A><H3>
log</H3>
<PRE>
void <B>log</B>(java.lang.String msg)</PRE>
<DL>
<DD>Writes the specified message to a servlet log file, usually
an event log. The name and type of the servlet log file is
specific to the servlet container.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>msg</CODE> - a <code>String</code> specifying the
message to be written to the log file</DL>
</DD>
</DL>
<HR>
<A NAME="log(java.lang.Exception, java.lang.String)"><!-- --></A><H3>
log</H3>
<PRE>
void <B>log</B>(java.lang.Exception exception,
java.lang.String msg)</PRE>
<DL>
<DD><B>Deprecated.</B> <I>As of Java Servlet API 2.1, use
<A HREF="../../javax/servlet/ServletContext.html#log(java.lang.String, java.lang.Throwable)"><CODE>log(String message, Throwable throwable)</CODE></A>
instead.
<p>This method was originally defined to write an
exception's stack trace and an explanatory error message
to the servlet log file.</I>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="log(java.lang.String, java.lang.Throwable)"><!-- --></A><H3>
log</H3>
<PRE>
void <B>log</B>(java.lang.String message,
java.lang.Throwable throwable)</PRE>
<DL>
<DD>Writes an explanatory message and a stack trace
for a given <code>Throwable</code> exception
to the servlet log file. The name and type of the servlet log
file is specific to the servlet container, usually an event log.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>message</CODE> - a <code>String</code> that
describes the error or exception<DD><CODE>throwable</CODE> - the <code>Throwable</code> error
or exception</DL>
</DD>
</DL>
<HR>
<A NAME="getRealPath(java.lang.String)"><!-- --></A><H3>
getRealPath</H3>
<PRE>
java.lang.String <B>getRealPath</B>(java.lang.String path)</PRE>
<DL>
<DD>Returns a <code>String</code> containing the real path
for a given virtual path. For example, the path "/index.html"
returns the absolute file path on the server's filesystem would be
served by a request for "http://host/contextPath/index.html",
where contextPath is the context path of this ServletContext..
<p>The real path returned will be in a form
appropriate to the computer and operating system on
which the servlet container is running, including the
proper path separators. This method returns <code>null</code>
if the servlet container cannot translate the virtual path
to a real path for any reason (such as when the content is
being made available from a <code>.war</code> archive).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>path</CODE> - a <code>String</code> specifying a virtual path
<DT><B>Returns:</B><DD>a <code>String</code> specifying the real path,
or null if the translation cannot be performed</DL>
</DD>
</DL>
<HR>
<A NAME="getServerInfo()"><!-- --></A><H3>
getServerInfo</H3>
<PRE>
java.lang.String <B>getServerInfo</B>()</PRE>
<DL>
<DD>Returns the name and version of the servlet container on which
the servlet is running.
<p>The form of the returned string is
<i>servername</i>/<i>versionnumber</i>.
For example, the JavaServer Web Development Kit may return the string
<code>JavaServer Web Dev Kit/1.0</code>.
<p>The servlet container may return other optional information
after the primary string in parentheses, for example,
<code>JavaServer Web Dev Kit/1.0 (JDK 1.1.6; Windows NT 4.0 x86)</code>.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>a <code>String</code> containing at least the
servlet container name and version number</DL>
</DD>
</DL>
<HR>
<A NAME="getInitParameter(java.lang.String)"><!-- --></A><H3>
getInitParameter</H3>
<PRE>
java.lang.String <B>getInitParameter</B>(java.lang.String name)</PRE>
<DL>
<DD>Returns a <code>String</code> containing the value of the named
context-wide initialization parameter, or <code>null</code> if the
parameter does not exist.
<p>This method can make available configuration information useful
to an entire "web application". For example, it can provide a
webmaster's email address or the name of a system that holds
critical data.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - a <code>String</code> containing the name of the
parameter whose value is requested
<DT><B>Returns:</B><DD>a <code>String</code> containing at least the
servlet container name and version number<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletConfig.html#getInitParameter(java.lang.String)"><CODE>ServletConfig.getInitParameter(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getInitParameterNames()"><!-- --></A><H3>
getInitParameterNames</H3>
<PRE>
java.util.Enumeration <B>getInitParameterNames</B>()</PRE>
<DL>
<DD>Returns the names of the context's initialization parameters as an
<code>Enumeration</code> of <code>String</code> objects, or an
empty <code>Enumeration</code> if the context has no initialization
parameters.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an <code>Enumeration</code> of <code>String</code>
objects containing the names of the context's
initialization parameters<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletConfig.html#getInitParameter(java.lang.String)"><CODE>ServletConfig.getInitParameter(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getAttribute(java.lang.String)"><!-- --></A><H3>
getAttribute</H3>
<PRE>
java.lang.Object <B>getAttribute</B>(java.lang.String name)</PRE>
<DL>
<DD>Returns the servlet container attribute with the given name,
or <code>null</code> if there is no attribute by that name.
An attribute allows a servlet container to give the
servlet additional information not
already provided by this interface. See your
server documentation for information about its attributes.
A list of supported attributes can be retrieved using
<code>getAttributeNames</code>.
<p>The attribute is returned as a <code>java.lang.Object</code>
or some subclass.
Attribute names should follow the same convention as package
names. The Java Servlet API specification reserves names
matching <code>java.*</code>, <code>javax.*</code>,
and <code>sun.*</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - a <code>String</code> specifying the name
of the attribute
<DT><B>Returns:</B><DD>an <code>Object</code> containing the value
of the attribute, or <code>null</code>
if no attribute exists matching the given
name<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletContext.html#getAttributeNames()"><CODE>getAttributeNames()</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getAttributeNames()"><!-- --></A><H3>
getAttributeNames</H3>
<PRE>
java.util.Enumeration <B>getAttributeNames</B>()</PRE>
<DL>
<DD>Returns an <code>Enumeration</code> containing the
attribute names available
within this servlet context. Use the
<A HREF="../../javax/servlet/ServletContext.html#getAttribute(java.lang.String)"><CODE>getAttribute(java.lang.String)</CODE></A> method with an attribute name
to get the value of an attribute.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an <code>Enumeration</code> of attribute
names<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletContext.html#getAttribute(java.lang.String)"><CODE>getAttribute(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="setAttribute(java.lang.String, java.lang.Object)"><!-- --></A><H3>
setAttribute</H3>
<PRE>
void <B>setAttribute</B>(java.lang.String name,
java.lang.Object object)</PRE>
<DL>
<DD>Binds an object to a given attribute name in this servlet context. If
the name specified is already used for an attribute, this
method will replace the attribute with the new to the new attribute.
<p>If listeners are configured on the <code>ServletContext</code> the
container notifies them accordingly.
<p>
If a null value is passed, the effect is the same as calling
<code>removeAttribute()</code>.
<p>Attribute names should follow the same convention as package
names. The Java Servlet API specification reserves names
matching <code>java.*</code>, <code>javax.*</code>, and
<code>sun.*</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - a <code>String</code> specifying the name
of the attribute<DD><CODE>object</CODE> - an <code>Object</code> representing the
attribute to be bound</DL>
</DD>
</DL>
<HR>
<A NAME="removeAttribute(java.lang.String)"><!-- --></A><H3>
removeAttribute</H3>
<PRE>
void <B>removeAttribute</B>(java.lang.String name)</PRE>
<DL>
<DD>Removes the attribute with the given name from
the servlet context. After removal, subsequent calls to
<A HREF="../../javax/servlet/ServletContext.html#getAttribute(java.lang.String)"><CODE>getAttribute(java.lang.String)</CODE></A> to retrieve the attribute's value
will return <code>null</code>.
<p>If listeners are configured on the <code>ServletContext</code> the
container notifies them accordingly.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - a <code>String</code> specifying the name
of the attribute to be removed</DL>
</DD>
</DL>
<HR>
<A NAME="getServletContextName()"><!-- --></A><H3>
getServletContextName</H3>
<PRE>
java.lang.String <B>getServletContextName</B>()</PRE>
<DL>
<DD>Returns the name of this web application corresponding to this ServletContext as specified in the deployment
descriptor for this web application by the display-name element.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>The name of the web application or null if no name has been declared in the deployment descriptor.<DT><B>Since:</B></DT>
<DD>Servlet 2.3</DD>
</DL>
</DD>
</DL>
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