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portal越来越流行了

<TD WIDTH="15%"><B><A HREF="../../javax/portlet/ResourceServingPortlet.html" title="interface in javax.portlet">ResourceServingPortlet</A></B></TD>
<TD>The <code>ResourceServingPortlet</code> interface allows
 serving resources through the portlet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/ResourceURL.html" title="interface in javax.portlet">ResourceURL</A></B></TD>
<TD>The <CODE>ResourceURL</CODE> defines a resource URL that when clicked will
 result in a <code>serveResource</code> call of the
 <code>ResourceServingPortlet</code> interface.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/StateAwareResponse.html" title="interface in javax.portlet">StateAwareResponse</A></B></TD>
<TD>The <CODE>StateAwareResponse</CODE> represents a response that can modify
 state information or send events.<BR>
 It extends the PortletResponse interface.</TD>
</TR>
</TABLE>
&nbsp;

<P>

<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Class Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/GenericPortlet.html" title="class in javax.portlet">GenericPortlet</A></B></TD>
<TD>The <CODE>GenericPortlet</CODE> class provides a default implementation for
 the <CODE>Portlet</CODE> interface.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/PortletMode.html" title="class in javax.portlet">PortletMode</A></B></TD>
<TD>The <CODE>PortletMode</CODE> class represents
 the possible modes that a portlet can assume.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/PortletSessionUtil.html" title="class in javax.portlet">PortletSessionUtil</A></B></TD>
<TD>The <CODE>PortletSessionUtil</CODE>  class helps identify and decode
 attributes in the <CODE>PORTLET_SCOPE</CODE> scope of the PortletSession
 when accessed through the HttpSession an from within calls to methods
 of the HttpSessionBindingListener interface.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/WindowState.html" title="class in javax.portlet">WindowState</A></B></TD>
<TD>The <CODE>WindowState</CODE> class represents
 the possible window states that a portlet window can assume.</TD>
</TR>
</TABLE>
&nbsp;

<P>

<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Enum Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/PortletRequest.P3PUserInfos.html" title="enum in javax.portlet">PortletRequest.P3PUserInfos</A></B></TD>
<TD>P3P user information constants.</TD>
</TR>
</TABLE>
&nbsp;

<P>

<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Exception Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A></B></TD>
<TD>The <CODE>PortletException</CODE> class defines a general exception
 that a portlet can throw when it is unable to perform its operation
 successfully.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/PortletModeException.html" title="class in javax.portlet">PortletModeException</A></B></TD>
<TD>The <CODE>PortletModeException</CODE> is thrown when a portlet
 tries to use or set a portlet mode that is not supported by the current
 runtime environment or the portlet.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/PortletSecurityException.html" title="class in javax.portlet">PortletSecurityException</A></B></TD>
<TD>A portlet should throw a <CODE>PortletSecurityException</CODE>
 when a call fails because of security reasons.<br>
 Additionally it can be thrown by the portal/portlet-container.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/ReadOnlyException.html" title="class in javax.portlet">ReadOnlyException</A></B></TD>
<TD>The <CODE>ReadOnlyException</CODE> is thrown when a portlet tries
 to change the value for a read-only preference attribute.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/UnavailableException.html" title="class in javax.portlet">UnavailableException</A></B></TD>
<TD>The portlet should throw the <CODE>UnavailableException</CODE> when 
 the portlet is either temporarily or permanently unavailable to handle requests.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/ValidatorException.html" title="class in javax.portlet">ValidatorException</A></B></TD>
<TD>The <CODE>ValidatorException</CODE> is thrown by the
 <CODE>validate</CODE> method of a PreferencesValidator when 
 the validation of a preference failed.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/WindowStateException.html" title="class in javax.portlet">WindowStateException</A></B></TD>
<TD>The <CODE>WindowStateException</CODE> is thrown when a portlet
 tries to use a window state that is not supported by the current
 runtime environment or the portlet.</TD>
</TR>
</TABLE>
&nbsp;

<P>

<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Annotation Types Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/ProcessAction.html" title="annotation in javax.portlet">ProcessAction</A></B></TD>
<TD>Annotation for marking a method for processing
 a specific action.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/ProcessEvent.html" title="annotation in javax.portlet">ProcessEvent</A></B></TD>
<TD>Annotation for marking a method for handling
 a specific event.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="../../javax/portlet/RenderMode.html" title="annotation in javax.portlet">RenderMode</A></B></TD>
<TD>Annotation for marking a method for handling
 a specific portlet mode in the render phase.</TD>
</TR>
</TABLE>
&nbsp;

<P>
<A NAME="package_description"><!-- --></A><H2>
Package javax.portlet Description
</H2>

<P>
The javax.portlet package defines the API for Java Portlet Specification V2.0.
<p>
A portlet is a Java technology based web component, managed by a portlet container,
that processes requests and generates dynamic content. Portlets provide a presentation
layer to Information Systems.
<p>
Portlets generate fragments of markup (e.g. HTML, XHTML, WML). A portal combines markup
fragments generated by different portlets into a portal page.
<p>
A portlet container manages the lifecyle of portlets. It also provides the required runtime environment.
<p>
Portlets are bundled in Portlet Applications as web applications using the WAR file format.
A portlet application consists of two deployment descriptors: one to specify
the web application resources (web.xml) and one to specify the portlet resources
(portlet.xml).
<p>
Click
<a href="portlet.xml.txt" target="portlet">here</a>
for an example of a portlet resources deployment descriptor (portlet.xml).
<P>

<P>
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