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--><HR><H2>Package javax.servlet</H2>This chapter describes the javax.servlet package.<P><B>See: </B><BR> <A HREF="#package_description"><B>Description</B></A><P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Interface Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Filter.html"><I>Filter</I></A></B></TD><TD>A filter is an object than perform filtering tasks on either the request to a resource (a servlet or static content), or on the response from a resource, or both.<br><br> Filters perform filtering in the <code>doFilter</code> method.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="FilterChain.html"><I>FilterChain</I></A></B></TD><TD>A FilterChain is an object provided by the servlet container to the developer giving a view into the invocation chain of a filtered request for a resource.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="FilterConfig.html"><I>FilterConfig</I></A></B></TD><TD>A filter configuration object used by a servlet container used to pass information to a filter during initialization.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="RequestDispatcher.html"><I>RequestDispatcher</I></A></B></TD><TD>Defines an object that receives requests from the client and sends them to any resource (such as a servlet, HTML file, or JSP file) on the server.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="Servlet.html"><I>Servlet</I></A></B></TD><TD>Defines methods that all servlets must implement.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletConfig.html"><I>ServletConfig</I></A></B></TD><TD>A servlet configuration object used by a servlet container used to pass information to a servlet during initialization.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletContext.html"><I>ServletContext</I></A></B></TD><TD>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.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletContextAttributeListener.html"><I>ServletContextAttributeListener</I></A></B></TD><TD>Implementations of this interface recieve notifications of changes to the attribute list on the servlet context of a web application.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletContextListener.html"><I>ServletContextListener</I></A></B></TD><TD>Implementations of this interface recieve notifications about changes to the servlet context of the web application they are part of.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletRequest.html"><I>ServletRequest</I></A></B></TD><TD>Defines an object to provide client request information to a servlet.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletRequestAttributeListener.html"><I>ServletRequestAttributeListener</I></A></B></TD><TD>A ServletRequestAttributeListener can be implemented by the developer interested in being notified of attribute changes in requests in an application.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletRequestListener.html"><I>ServletRequestListener</I></A></B></TD><TD>A ServletRequestListener can be implemented by the developer interested in being notified of requests coming in and out of scope in a web component.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletResponse.html"><I>ServletResponse</I></A></B></TD><TD>Defines an object to assist a servlet in sending a response to the client.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="SingleThreadModel.html"><I>SingleThreadModel</I></A></B></TD><TD><B>Deprecated.</B> <I>As of Java Servlet API 2.4, with no direct replacement.</I></TD></TR></TABLE> <P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Class Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="GenericServlet.html">GenericServlet</A></B></TD><TD>Defines a generic, protocol-independent servlet.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletContextAttributeEvent.html">ServletContextAttributeEvent</A></B></TD><TD>This is the event class for notifications about changes to the attributes of the servlet context of a web application.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletContextEvent.html">ServletContextEvent</A></B></TD><TD>This is the event class for notifications about changes to the servlet context of a web application.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletInputStream.html">ServletInputStream</A></B></TD><TD>Provides an input stream for reading binary data from a client request, including an efficient <code>readLine</code> method for reading data one line at a time.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletOutputStream.html">ServletOutputStream</A></B></TD><TD>Provides an output stream for sending binary data to the client.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletRequestAttributeEvent.html">ServletRequestAttributeEvent</A></B></TD><TD>This is the event class for notifications of changes to the attributes of ServletRequests in an application.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletRequestEvent.html">ServletRequestEvent</A></B></TD><TD>Events of these kinf indicate lifecycle events for a ServletRequest.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletRequestWrapper.html">ServletRequestWrapper</A></B></TD><TD>Provides a convenient implementation of the ServletRequest interface that can be subclassed by developers wishing to adapt the request to a Servlet.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletResponseWrapper.html">ServletResponseWrapper</A></B></TD><TD>Provides a convenient implementation of the ServletResponse interface that can be subclassed by developers wishing to adapt the response from a Servlet.</TD></TR></TABLE> <P><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Exception Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="ServletException.html">ServletException</A></B></TD><TD>Defines a general exception a servlet can throw when it encounters difficulty.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD WIDTH="15%"><B><A HREF="UnavailableException.html">UnavailableException</A></B></TD><TD>Defines an exception that a servlet or filter throws to indicate that it is permanently or temporarily unavailable.</TD></TR></TABLE> <P><A NAME="package_description"><!-- --></A><H2>Package javax.servlet Description</H2><P>This chapter describes the javax.servlet package. The chapter includes content that is generated automatically from javadoc embedded in the actual Java classes and interfaces. This allows the creation of a single, authoritative, specification document. <DIV><H2 CLASS="A-Head"><A NAME="pgfId-998201"></A>Generic Servlet Interfaces and Classes</H2><P CLASS="First"><A NAME="pgfId-998202"></A>The <EM CLASS="Code">javax.servlet package </EM>contains a number of classes and interfaces that describe and define the contracts between a servlet class and the runtime environment provided for an instance of such a class by a conforming servlet container. </P><P CLASS="Body"><A NAME="pgfId-998203"></A>The <EM CLASS="Filename-Command">Servlet</EM> interface is the central abstraction of the servlet API. All servlets implement this interface either directly, or more commonly, by extending a class that implements the interface. The two classes in the servlet API that implement the <EM CLASS="Filename-Command">Servlet</EM> interface are <EM CLASS="Filename-Command">GenericServlet</EM> and <EM CLASS="Filename-Command">HttpServlet</EM>. For most purposes, developers will extend <EM CLASS="Filename-Command">HttpServlet</EM> to implement their servlets while implementing web applications employing the HTTP protocol..</P><P CLASS="Body"><A NAME="pgfId-998204"></A>The basic <EM CLASS="Filename-Command">Servlet</EM> interface defines a <EM CLASS="Filename-Command">service</EM> method for handling client requests. This method is called for each request that the servlet container routes to an instance of a servlet. </P></DIV><DIV><H2 CLASS="A-Head"><A NAME="pgfId-998205"></A>The javax.servlet package</H2><P CLASS="First"><A NAME="pgfId-998206"></A><EM CLASS="Code">The following section summarizes the javax.servlet package:</EM></P><P CLASS="Body"><A NAME="pgfId-998197"></A> </P></DIV><P><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_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="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Package</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <FONT CLASS="NavBarFont1">Class</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 PACKAGE <A HREF="../../javax/servlet/http/package-summary.html"><B>NEXT PACKAGE</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="package-summary.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR></BODY></HTML>⌨️ 快捷键说明
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